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188 results on '"Brogniez, Colette"'

3. Growth and Global Persistence of Stratospheric Sulfate Aerosols From the 2022 Hunga Tonga–Hunga Ha'apai Volcanic Eruption

Author

Boichu, Marie, primary, Grandin, Raphaël, additional, Blarel, Luc, additional, Torres, Benjamin, additional, Derimian, Yevgeny, additional, Goloub, Philippe, additional, Brogniez, Colette, additional, Chiapello, Isabelle, additional, Dubovik, Oleg, additional, Mathurin, Théo, additional, Pascal, Nicolas, additional, Patou, Maximilien, additional, and Riedi, Jérôme, additional

Published
2023
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4. At the source of the polarisation of auroral emissions: experiments and modeling

Author

Bosse Léo, Lilensten Jean, Gillet Nicolas, Brogniez Colette, Pujol Olivier, Rochat Sylvain, Delboulbé Alain, Curaba Stéphane, and Johnsen Magnar Gullikstad

Subjects
auroral lights, linear polarisation, radiative transfer, ionospheric environment, Meteorology. Climatology, QC851-999
Abstract

A polarised radiative transfer model (POMEROL) has been developed to compute the polarisation measured by a virtual instrument in a given nocturnal environment. This single-scattering model recreates real-world conditions (among them atmospheric and aerosol profiles, light sources with complex geometries at the ground and in the sky, terrain obstructions). It has been successfully tested at mid-latitudes where sky emissions are of weak intensity. We show a series of comparisons between POMEROL predictions and polarisation measurements during two field campaigns in the auroral zone, in both quiet and active conditions. These comparisons show the strength of the model to assess the aerosol characteristics in the lower atmosphere by using a mesospheric line. They also show that three main upper atmosphere emissions must be polarised: the green atomic oxygen line at 557.7 nm and the 1st N2+ N2+$ {\mathrm{N}}_2^{+}$ negative band at 391.4 nm (purple) and 427.8 nm (blue). This polarisation can be either created directly at the radiative de-excitation or may occur when the non-polarised emission crosses the ionospheric currents. We provide some of the potentialities it offers in the frame of space weather. These require refinements of the preliminary modeling approach considered in the present study.

Published
2022
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5. First evidence of polarized emissions in pulsating aurorae

Author

Bosse, Leo, primary, Cessateur, Gaël, additional, Lamy, Hervé, additional, Lilensten, Jean, additional, Gillet, Nicolas, additional, Brogniez, Colette, additional, Pujol, Olivier, additional, Rochat, Sylvain, additional, Curaba, Stéphane, additional, Delboulbé, Alain, additional, and Johnsen, Magnar G., additional

Published
2023
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8. First evidence of polarized emissions in pulsating aurorae

Author

Bosse, Léo, Cessateur, Gaël, Hervé, Lamy, Lilensten, Jean, Gillet, Nicolas, Brogniez, Colette, and Pujol, Olivier

Abstract

In the last decade, several instruments have been developped to measure the auroral light polarisation. However, its study has faced the issue of anthropic light pollution and scattering in the lower atmosphere (Bosse et al., 2020). To overcome this challenge the most succesfull method was the use of a polarised radiative transfer model to identify the light pollution contribution (Bosse et al., 2022). This year, a new look at the data revealed that pulsating aurorae are polarised, and that this polarisation carries a lot of information. Searching for polarisation in pulsating aurorae allows us to dismiss any external source of polarisation that is not synched with the pulsation of the aurora. Thus light pollution is not a problem anymore.These polarisation patterns are seen in the green atomic oxygen line at 557.7 nm, the 1st N2+ negative band at 391.4 nm (purple) and 427.8 nm (blue).Today, there are no clear explanations on the origin of this auroral polarisation, or its relation to the local state of the upper atmosphere. An hypothesis is that this polarisation can be either created directly at the radiative de-excitation or may occur when the non-polarised emission crosses the ionospheric currents.We will present how these new findings confirm the ionospheric origin of the polarisation observed from the ground, and discussing about the opportunities these observations and models offer in the frame of space weather, aerosol and light pollution study., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

Published
2023

9. Ozone, DNA-active UV radiation, and cloud changes for the near-global mean and at high latitudes due to enhanced greenhouse gas concentrations

Author

Eleftheratos, Kostas, primary, Kapsomenakis, John, additional, Fountoulakis, Ilias, additional, Zerefos, Christos S., additional, Jöckel, Patrick, additional, Dameris, Martin, additional, Bais, Alkiviadis F., additional, Bernhard, Germar, additional, Kouklaki, Dimitra, additional, Tourpali, Kleareti, additional, Stierle, Scott, additional, Liley, J. Ben, additional, Brogniez, Colette, additional, Auriol, Frédérique, additional, Diémoz, Henri, additional, Simic, Stana, additional, Petropavlovskikh, Irina, additional, Lakkala, Kaisa, additional, and Douvis, Kostas, additional

Published
2022
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11. Ozone and DNA active UV radiation changes for the near global mean and at high latitudes due to enhanced greenhouse gas concentrations

Author

Eleftheratos, Kostas, primary, Kapsomenakis, John, additional, Fountoulakis, Ilias, additional, Zerefos, Christos S., additional, Jöckel, Patrick, additional, Dameris, Martin, additional, Bais, Alkiviadis F., additional, Bernhard, Germar, additional, Kouklaki, Dimitra, additional, Tourpali, Kleareti, additional, Stierle, Scott, additional, Liley, J. Ben, additional, Brogniez, Colette, additional, Auriol, Frédérique, additional, Diémoz, Henri, additional, Simic, Stana, additional, and Petropavlovskikh, Irina, additional

Published
2022
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12. Supplementary material to "Ozone and DNA active UV radiation changes for the near global mean and at high latitudes due to enhanced greenhouse gas concentrations"

Author

Eleftheratos, Kostas, primary, Kapsomenakis, John, additional, Fountoulakis, Ilias, additional, Zerefos, Christos S., additional, Jöckel, Patrick, additional, Dameris, Martin, additional, Bais, Alkiviadis F., additional, Bernhard, Germar, additional, Kouklaki, Dimitra, additional, Tourpali, Kleareti, additional, Stierle, Scott, additional, Liley, J. Ben, additional, Brogniez, Colette, additional, Auriol, Frédérique, additional, Diémoz, Henri, additional, Simic, Stana, additional, and Petropavlovskikh, Irina, additional

Published
2022
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16. Europe’s darker atmosphere in the UV-B

Author

Seckmeyer, Gunther, Glandorf, Merle, Wichers, Cordula, McKenzie, Richard, Henriques, Diamantino, Carvalho, Fernanda, Webb, Ann, Siani, Anna-Maria, Bais, Alkiviadis, Kjeldstad, Berit, Brogniez, Colette, Werle, Peter, Koskela, Tapani, Lakkala, Kaisa, Gröbner, Julian, Slaper, Harry, denOuter, Peter, and Feister, Uwe

Published
2008
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17. Solar UV Radiation in the Tropics: Human Exposure at Reunion Island (21° S, 55° E) during Summer Outdoor Activities

Author

Cadet, Jean-Maurice, Bencherif, Hassan, Cadet, Nicolas, Lamy, Kévin, Portafaix, Thierry, Belus, Matthias, Brogniez, Colette, Auriol, Frédérique, Metzger, Jean-Marc, Wright, Caradee, Laboratoire de l'Atmosphère et des Cyclones (LACy), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, University of KwaZulu-Natal (UKZN), Université de La Réunion - Faculté de Lettres et Sciences humaines (UR FLSH), Université de La Réunion (UR), Conseil Régional de La Réunion, Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion), Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS), Medical Research Council [South African], This research was funded jointly by the CNRS (Centre National de la Recherche Scientifique) and the NRF (National Research Foundation) in the framework of the IRP ARSAIO and by the South Africa/France PROTEA Program (project No 42470VA). CYW receives funding from the South African Medical Research Council and the National Research Foundation. This research is also part of the activities of the UV-Indien program, which funded some of the materials used in this study. UV-Indien Network is funded jointly by European cooperation programme PO InterregV and Regional Council of Reunion Island., Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, University of KwaZulu-Natal [Durban, Afrique du Sud] (UKZN), and Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Ultraviolet Rays, solar UV radiation, lcsh:R, mountain, hike, lcsh:Medicine, Environmental Exposure, human health, Article, tropics, UV exposure, volcano, Solar Energy, Sunlight, Humans, Recreation, beach, Seasons, Reunion
Abstract

Reunion Island is a popular tourist destination with sandy beaches, an active volcano (Piton de la Fournaise), and Piton des Neiges, the highest and most dominant geological feature on the island. Reunion is known to have high levels of solar ultraviolet radiation (UVR) with an ultraviolet index (UVI) which can reach 8 in winter and 16 in summer (climatological conditions). UVR has been linked to skin cancer, melanoma, and eye disease such as cataracts. The World Health Organization (WHO) devised the UVI as a tool for expressing UVR intensity. Thresholds ranging from low (UVI 1&ndash, 2) to extreme (UVI &gt, 11) were defined depending on the risk to human health. The purpose of the study was to assess UVR exposure levels over three of the busiest tourist sites on the island. UVR was measured over several hours along popular hiking trails around Piton de la Fournaise (PDF), Piton des Neiges (PDN), and St-Leu Beach (LEU). The results were compared with those recorded by the local UV station at Saint-Denis. In addition, cumulative standard erythemal dose (SED) was calculated. Results showed that UVI exposure at PDF, PDN, and LEU were extreme (&gt, 11) and reached maximum UVI levels of 21.1, 22.5, and 14.5, respectively. Cumulative SEDs were multiple times higher than the thresholds established by the Fitzpatrick skin phototype classification. UVI measurements at the three study sites showed that Reunion Island is exposed to extreme UVR conditions. Public awareness campaigns are needed to inform the population of the health risks related to UVR exposure.

Published
2020
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18. Inter-Comparison Campaign of Solar UVR Instruments under Clear Sky Conditions at Reunion Island (21 • S, 55 • E)

Author

Cadet, Jean-Maurice, Portafaix, Thierry, Bencherif, Hassan, Lamy, Kévin, Brogniez, Colette, Auriol, Frédérique, Metzger, Jean-Marc, BOUDREAULT, Louis-Etienne, Wright, Caradee Yael, Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, University of KwaZulu-Natal [Durban, Afrique du Sud] (UKZN), Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR), ReuniWatt, University of Pretoria [South Africa], Medical Research Council [South African], Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, University of KwaZulu-Natal (UKZN), and Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, UV instruments, solar ultraviolet radiation, clear sky, UV index, La Réunion
Abstract

International audience; Measurement of solar ultraviolet radiation (UVR) is important for the assessment of potential beneficial and adverse impacts on the biosphere, plants, animals, and humans. Excess solar UVR exposure in humans is associated with skin carcinogenesis and immunosuppression. Several factors influence solar UVR at the Earth's surface, such as latitude and cloud cover. Given the potential risks from solar UVR there is a need to measure solar UVR at different locations using effective instrumentation. Various instruments are available to measure solar UVR, but some are expensive and others are not portable, both restrictive variables for exposure assessments. Here, we compared solar UVR sensors commercialized at low or moderate cost to assess their performance and quality of measurements against a high-grade Bentham spectrometer. The inter-comparison campaign took place between March 2018 and February 2019 at Saint-Denis, La Réunion. Instruments evaluated included a Kipp&Zonen UVS-E-T radiometer, a Solar Light UV-Biometer, a SGLux UV-Cosine radiometer, and a Davis radiometer. Cloud fraction was considered using a SkyCamVision all-sky camera and the Tropospheric Ultraviolet Visible radiative transfer model was used to model clear-sky conditions. Overall, there was good reliability between the instruments over time, except for the Davis radiometer, which showed dependence on solar zenith angle. The Solar Light UV-Biometer and the Kipp&Zonen radiometer gave satisfactory results, while the low-cost SGLux radiometer performed better in clear sky conditions. Future studies should investigate temporal drift and stability over time.

Published
2020
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19. Inter-Comparison Campaign of Solar UVR Instruments under Clear Sky Conditions at Reunion Island (21°S, 55°E)

Author

Cadet, Jean-Maurice, Portafaix, Thierry, Bencherif, Hassan, Lamy, Kévin, Brogniez, Colette, Auriol, Frédérique, Metzger, Jean-Marc, Boudreault, Louis-Etienne, and Wright, Caradee Yael

Subjects
integumentary system, Ultraviolet Rays, fungi, lcsh:R, Reproducibility of Results, food and beverages, lcsh:Medicine, solar ultraviolet radiation, Article, La Réunion, biological sciences, Sunlight, UV instruments, Radiometry, Reunion, clear sky, UV index
Abstract

Measurement of solar ultraviolet radiation (UVR) is important for the assessment of potential beneficial and adverse impacts on the biosphere, plants, animals, and humans. Excess solar UVR exposure in humans is associated with skin carcinogenesis and immunosuppression. Several factors influence solar UVR at the Earth&rsquo, s surface, such as latitude and cloud cover. Given the potential risks from solar UVR there is a need to measure solar UVR at different locations using effective instrumentation. Various instruments are available to measure solar UVR, but some are expensive and others are not portable, both restrictive variables for exposure assessments. Here, we compared solar UVR sensors commercialized at low or moderate cost to assess their performance and quality of measurements against a high-grade Bentham spectrometer. The inter-comparison campaign took place between March 2018 and February 2019 at Saint-Denis, La R&eacute, union. Instruments evaluated included a Kipp&amp, Zonen UVS-E-T radiometer, a Solar Light UV-Biometer, a SGLux UV-Cosine radiometer, and a Davis radiometer. Cloud fraction was considered using a SkyCamVision all-sky camera and the Tropospheric Ultraviolet Visible radiative transfer model was used to model clear-sky conditions. Overall, there was good reliability between the instruments over time, except for the Davis radiometer, which showed dependence on solar zenith angle. The Solar Light UV-Biometer and the Kipp&amp, Zonen radiometer gave satisfactory results, while the low-cost SGLux radiometer performed better in clear sky conditions. Future studies should investigate temporal drift and stability over time.

Published
2020

20. UV-Indien Network ground-based measurements: comparisons with satellite and model estimates of UV radiation over the Western Indian Ocean

Author

Lamy, Kevin, primary, Portafaix, Thierry, additional, Brogniez, Colette, additional, Lakkala, Kaisa, additional, Pitkänen, Mikko R. A., additional, Arola, Antti, additional, Forestier, Jean-Baptiste, additional, Amelie, Vincent, additional, Toihir, Mohamed Abdoulwahab, additional, and Rakotoniaina, Solofoarisoa, additional

Published
2021
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21. Optical and physical properties of stratospheric aerosols from balloon measurements in the visible and near-infrared domains. III. Presence of aerosols in the middle stratosphere

Author

Renard, Jean-Baptiste, Ovarlez, Joelle, Berthet, Gwenael, Fussen, Didier, Vanhellemont, Filip, Brogniez, Colette, Hadamcik, Edith, Chartier, Michel, and Ovarlez, Henri

Subjects
Aerosols -- Research, Stratosphere -- Research, Spectrum analysis -- Research, Optics -- Research, Astronomy, Physics
Abstract

The aerosol extinction measurements in the ultraviolet and visible wavelengths by the balloonborne spectrometer Spectroscopie d'Absorption Lunaire pour l'Observation des Minoritaires Ozone et [NO.sub.x] (SALOMON) show that aerosols are present in the middle stratosphere, above 25-km altitude. These observations are confirmed by the extinction measurements performed by a solar occultation radiometer. The balloonborne Laboratoire de Meteorologie Dynamique (LMD) counter instrument also confirms the presence of aerosol around 30-km altitude, with an unrealistic excess of micronic particles assuming that only liquid sulfate aerosols are present. An unexpected spectral structure around 640-nm observed by SALOMON is also detectable in extinction measurements by the satellite instrument Stratospheric Aerosols and Gas Experiment III. This set of measurements could indicate that solid aerosols were detected at these altitude ranges. The amount of soot detected up to now in the lower stratosphere is too low to explain these measurements. Thus, the presence of interplanetary dust grains and micrometeorites may need to be invoked. Moreover, it seems that these grains fill the stratosphere in stratified layers. OCIS codes: 010.1110, 280.1100.

Published
2005

22. Retrieval of the ultraviolet effective snow albedo during 1998 winter campaign in the French Alps

Author

Smolskaia, Irina, Masserot, Dominique, Lenoble, Jacqueline, Brogniez, Colette, and de la Casiniere, Alain

Subjects
French Alps -- Environmental aspects, French Alps -- Natural history, Snow surveys -- Methods, Albedo -- 1998 AD, Snow -- 1998 AD, Snow surveys -- 1998 AD, Astronomy, Physics
Abstract

A measurement campaign was carried out in February 1998 at Briancon Station, French Alps (44.9[degrees] N, 6.65[degrees] E, 1310 m above sea level) in order to determine the UV effective snow albedo that was retrieved for both erythemal and UV-A irradiances from measurements and modeling enhancement factors. The results are presented for 15 cloudless days with very variable snow cover and a small snowfall in the middle of the campaign. Erythemal irradiance enhancement due to the surface albedo was found to decrease from approximately +15% to +5% with a jump to +22% after the snowfall, whereas UV-A irradiance enhancement decreased from 7% to 5% and increased to 15% after the snowfall. These values fit to effective surface albedos of 0.4, 0.1, and 0.5 for erythemal, and to effective albedos of 0.25, 0.1, and 0.4 for UV-A irradiances, respectively. An unexpected difference between the effective albedos retrieved in the two wavelength regions can be explained by the difference of the environment contribution. OCIS codes: 010.1310, 010.4950, 120.5630, 300.6540.

Published
2003

23. Optical and physical properties of stratospheric aerosols from balloon measurements in the visible and near-infrared domains. I. Analysis of aerosol extinction spectra from the AMON and SALOMON balloonborne spectrometers

Author

Berthet, Gwenael, Renard, Jean-Baptiste, Brogniez, Colette, Robert, Claude, Chartier, Michel, and Pirre, Michel

Subjects
Spectrometer -- Usage, Aerosols -- Measurement, Aerosols -- Environmental aspects, Astronomy, Physics
Abstract

Aerosol extinction coefficients have been derived in the 375-700-nm spectral domain from measurements in the stratosphere since 1992, at night, at mid- and high latitudes from 15 to 40 km, by two balloonborne spectrometers, Absorption par les Minoritaires Ozone et N[O.sub.x] (AMON) and Spectroscopie d'Absorption Lunaire pour l'Observation des Minoritaires Ozone et N[O.sub.x] (SALOMON). Log-normal size distributions associated with the Mie-computed extinction spectra that best fit the measurements permit calculation of integrated properties of the distributions. Although measured extinction spectra that correspond to background aerosols can be reproduced by the Mie scattering model by use of monomodal log-normal size distributions, each flight reveals some large discrepancies between measurement and theory at several altitudes. The agreement between measured and Mie-calculated extinction spectra is significantly improved by use of bimodal log-normal distributions. Nevertheless, neither monomodal nor bimodal distributions permit correct reproduction of some of the measured extinction shapes, especially for the 26 February 1997 AMON flight, which exhibited spectral behavior attributed to particles from a polar stratospheric cloud event. OCIS codes: 010.1100, 120.0280, 120.5820.

Published
2002

24. Optical and physical properties of stratospheric aerosols from balloon measurements in the visible and near-infrared domains. II. Comparison of extinction, reflectance, polarization, and counting measurements

Author

Renard, Jean-Baptiste, Berthet, Gwenael, Robert, Claude, Chartier, Michel, Pirre, Michel, Brogniez, Colette, Herman, Maurice, Verwaerde, Christian, Balois, Jean-Yves, Ovarlez, Joelle, Ovarlez, Henri, Crespin, Jacques, and Deshler, Terry

Subjects
Aerosols -- Measurement, Aerosols -- Environmental aspects, Spectrometer -- Usage, Astronomy, Physics
Abstract

The physical properties of stratospheric aerosols can be retrieved from optical measurements involving extinction, radiance, polarization, and counting. We present here the results of measurements from the balloonborne instruments AMON, SALOMON, and RADIBAL, and from the French Laboratoire de Meteorologie Dynamique and the University of Wyoming balloonborne particle counters. A cross comparison of the measurements was made for observations of background aerosols conducted during the polar winters of February 1997 and January--February 2000 for various altitudes from 13 to 19 kin. On the one hand, the effective radius and the total amount of background aerosols derived from the various sets of data are similar and are in agreement with pre-Pinatubo values. On the other hand, strong discrepancies occur in the shapes of the bimodal size distributions obtained from analysis of the raw measurements of the various instruments. It seems then that the log-normal assumption cannot fully reproduce the size distribution of background aerosols. The effect of the presence of particular aerosols on the measurements is discussed, and a new strategy for observations is proposed. Society of America OCIS codes: 010.1100, 120.0280, 120.5820, 120.5410.

Published
2002

25. Ultraviolet--visible bulk optical properties of randomly distributed soot

Author

Renard, Jean-Baptiste, Hadamcik, Edith, Brogniez, Colette, Berthet, Gwenael, Worms, Jean-Claude, Chartier, Michel, Pirre, Michel, Ovarlez, Joelle, and Ovarlez, Henri

Subjects
Soot -- Research, Meteorological optics -- Research, Astronomy, Physics
Abstract

The presence of soot in the lower stratosphere was recently established by in situ measurements. To isolate their contribution to optical measurements from that of background aerosol, the soot's bulk optical properties must be determined. Laboratory measurements of extinction and polarization of randomly distributed soot were conducted. For all soot, measurements show a slight reddening extinction between 400 and 700 nm and exhibit a maximum of 100% polarization at a scattering angle of 75 [+ or -] 5 [degrees]. Such results cannot be reproduced by use of Mie theory assumptions. The different optical properties of soot and background stratospheric aerosol could allow isolation of soot in future analyses of stratospheric measurements. OCIS codes: 010.1100, 120.5410, 290.2200, 290.4020.

Published
2001

26. Validation of the TROPOspheric Monitoring Instrument (TROPOMI) surface UV radiation product

Author

Lakkala, Kaisa, primary, Kujanpää, Jukka, additional, Brogniez, Colette, additional, Henriot, Nicolas, additional, Arola, Antti, additional, Aun, Margit, additional, Auriol, Frédérique, additional, Bais, Alkiviadis F., additional, Bernhard, Germar, additional, De Bock, Veerle, additional, Catalfamo, Maxime, additional, Deroo, Christine, additional, Diémoz, Henri, additional, Egli, Luca, additional, Forestier, Jean-Baptiste, additional, Fountoulakis, Ilias, additional, Garane, Katerina, additional, Garcia, Rosa Delia, additional, Gröbner, Julian, additional, Hassinen, Seppo, additional, Heikkilä, Anu, additional, Henderson, Stuart, additional, Hülsen, Gregor, additional, Johnsen, Bjørn, additional, Kalakoski, Niilo, additional, Karanikolas, Angelos, additional, Karppinen, Tomi, additional, Lamy, Kevin, additional, León-Luis, Sergio F., additional, Lindfors, Anders V., additional, Metzger, Jean-Marc, additional, Minvielle, Fanny, additional, Muskatel, Harel B., additional, Portafaix, Thierry, additional, Redondas, Alberto, additional, Sanchez, Ricardo, additional, Siani, Anna Maria, additional, Svendby, Tove, additional, and Tamminen, Johanna, additional

Published
2020
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27. Supplementary material to "Validation of TROPOMI Surface UV Radiation Product"

Author

Lakkala, Kaisa, primary, Kujanpää, Jukka, additional, Brogniez, Colette, additional, Henriot, Nicolas, additional, Arola, Antti, additional, Aun, Margit, additional, Auriol, Frédérique, additional, Bais, Alkiviadis F., additional, Bernhard, Germar, additional, De Bock, Veerle, additional, Catalfamo, Maxime, additional, Deroo, Christine, additional, Diémoz, Henri, additional, Egli, Luca, additional, Forestier, Jean-Baptiste, additional, Fountoulakis, Ilias, additional, Garcia, Rosa Delia, additional, Gröbner, Julian, additional, Hassinen, Seppo, additional, Heikkilä, Anu, additional, Henderson, Stuart, additional, Hülsen, Gregor, additional, Johnsen, Bjørn, additional, Kalakoski, Niilo, additional, Karanikolas, Angelos, additional, Karppinen, Tomi, additional, Lamy, Kevin, additional, León-Luis, Sergio F., additional, Lindfors, Anders V., additional, Metzger, Jean-Marc, additional, Minvielle, Fanny, additional, Muskatel, Harel B., additional, Portafaix, Thierry, additional, Redondas, Alberto, additional, Sanchez, Ricardo, additional, Siani, Anna Maria, additional, Svendby, Tove, additional, and Tamminen, Johanna, additional

Published
2020
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28. Validation of TROPOMI Surface UV Radiation Product

Author

Lakkala, Kaisa, primary, Kujanpää, Jukka, additional, Brogniez, Colette, additional, Henriot, Nicolas, additional, Arola, Antti, additional, Aun, Margit, additional, Auriol, Frédérique, additional, Bais, Alkiviadis F., additional, Bernhard, Germar, additional, De Bock, Veerle, additional, Catalfamo, Maxime, additional, Deroo, Christine, additional, Diémoz, Henri, additional, Egli, Luca, additional, Forestier, Jean-Baptiste, additional, Fountoulakis, Ilias, additional, Garcia, Rosa Delia, additional, Gröbner, Julian, additional, Hassinen, Seppo, additional, Heikkilä, Anu, additional, Henderson, Stuart, additional, Hülsen, Gregor, additional, Johnsen, Bjørn, additional, Kalakoski, Niilo, additional, Karanikolas, Angelos, additional, Karppinen, Tomi, additional, Lamy, Kevin, additional, León-Luis, Sergio F., additional, Lindfors, Anders V., additional, Metzger, Jean-Marc, additional, Minvielle, Fanny, additional, Muskatel, Harel B., additional, Portafaix, Thierry, additional, Redondas, Alberto, additional, Sanchez, Ricardo, additional, Siani, Anna Maria, additional, Svendby, Tove, additional, and Tamminen, Johanna, additional

Published
2020
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29. Possible Effects of Greenhouse Gases to Ozone Profiles and DNA Active UV-B Irradiance at Ground Level

Author

Eleftheratos, Kostas, primary, Kapsomenakis, John, additional, Zerefos, Christos S., additional, Bais, Alkiviadis F., additional, Fountoulakis, Ilias, additional, Dameris, Martin, additional, Jöckel, Patrick, additional, Haslerud, Amund S., additional, Godin-Beekmann, Sophie, additional, Steinbrecht, Wolfgang, additional, Petropavlovskikh, Irina, additional, Brogniez, Colette, additional, Leblanc, Thierry, additional, Liley, J. Ben, additional, Querel, Richard, additional, and Swart, Daan P. J., additional

Published
2020
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30. Ozone and DNA active UV radiation changes for the near global mean and at high latitudes due to enhanced greenhouse gas concentrations.

Author

Eleftheratos, Kostas, Kapsomenakis, John, Fountoulakis, Ilias, Zerefos, Christos S., Jöckel, Patrick, Dameris, Martin, Bais, Alkiviadis F., Bernhard, Germar, Kouklaki, Dimitra, Tourpali, Kleareti, Stierle, Scott, Liley, J. Ben, Brogniez, Colette, Auriol, Frédérique, Diémoz, Henri, Simic, Stana, and Petropavlovskikh, Irina

Subjects
OZONE, ULTRAVIOLET radiation, GREENHOUSE gases, DNA damage, CLIMATE change
Abstract

This study analyses the variability and trends of ultraviolet-B (UV-B, wavelength 280-320 nm) radiation that can cause DNA damage, which are caused by climate change due to enhanced greenhouse gas (GHG) concentrations. The analysis is based on DNA active irradiance, total ozone, total cloud cover, and surface albedo calculations with the EMAC Chemistry-Climate Model (CCM) free running simulations following the RCP-6.0 climate scenario for the period 1960-2100. The model output is evaluated with DNA active irradiance ground-based measurements, satellite SBUV (v8.7) total ozone measurements and satellite MODIS/Terra cloud cover data. The results show that the model reproduces the observed variability and change of total ozone, DNA active irradiance, and cloud cover for the period 2000-2018 quite well. Between 50° N-50° S, the DNA-damaging UV radiation is expected to decrease until 2050 and to increase thereafter, as it was shown previously by Eleftheratos et al. (2020). This change is associated with decreases in the model total cloud cover and insignificant trends in total ozone after about 2050. The new study confirms the previous work by adding more stations over low and mid-latitudes (13 instead of 5 stations). In addition, we include estimates from high latitude stations with long-term measurements of UV irradiance (2 stations in the northern high latitudes and 4 stations in the southern high latitudes greater than 55°). In contrast to the predictions for 50° N-50° S, it is shown that DNA active irradiance will continue to decrease after the year 2050 over high latitudes because of upward ozone trends. At latitudes poleward of 55° N, we estimate that DNA active irradiance will decrease by 10.6 ± 3.7 % from 2050 to 2100. Similarly, at latitudes poleward of 55° S, DNA active irradiance will decrease by 4.8 ± 2.9 % after 2050. The results for the high latitudes refer to the summer period and not to the seasons when ozone depletion occurs, i.e., in late winter and spring. The contributions of ozone, cloud and albedo trends on the DNA active irradiance trends are estimated and discussed. [ABSTRACT FROM AUTHOR]

Published
2022
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31. Large-scale particulate air pollution and chemical fingerprint of volcanic sulfate aerosols from the 2014-2015 Holuhraun flood lava eruption of Bárðarbunga volcano (Iceland)

Author

Boichu, Marie, Favez, Olivier, Riffault, Véronique, Petit, Jean-Eudes, Zhang, Yunjiang, Brogniez, Colette, Sciare, Jean, Chiapello, Isabelle, Clarisse, Lieven, Zhang, Shouwen, Pujol-Söhne, Nathalie, Tison, Emmanuel, Delbarre, Hervé, Goloub, Philippe, Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut National de l'Environnement Industriel et des Risques (INERIS), Centre for Energy and Environment (CERI EE - IMT Nord Europe), Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Nord Europe), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), The Cyprus Institute, Energy, Environment and Water Research Center, Spectroscopie de l'atmosphère, Service de Chimie Quantique et Photophysique, Université libre de Bruxelles (ULB), Service de Chimie Quantique et Photophysique, ATMO Hauts de France [Lille], Laboratoire de Physico-Chimie de l'Atmosphère (LPCA), Université du Littoral Côte d'Opale (ULCO), ANR VOLCPLUME (ANR-15-CE04-0003-01), Labex CaPPA (ANR-LABX-0005-01), CPER CLIMIBIO, Chantier Arctique, projet PARCS (Pollution in the Arctic system), ANR-15-CE04-0003,VOLCPLUME,Les panaches volcaniques: emissions, chimie/transport et impact sur l'atmosphère et le climat(2015), Centre for Energy and Environment (CERI EE), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], volcanic sulfate aerosols, air pollution, [SDE]Environmental Sciences, [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology, sulfur dioxide, Aerosol chemical speciation monitor, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, complex mixtures, industrial emissions, EMEP
Abstract

International audience; Volcanic sulfate aerosols play a key role in air quality and climate. However, the rate of oxidation of sulfur dioxide (SO2) precursor gas to sulfate aerosols (SO4^2-) in volcanic plumes is poorly known, especially in the troposphere. Here we determine the chemical speciation as well as the intensity and temporal persistence of the impact on air quality of sulfate aerosols from the 2014-2015 Holuhraun flood lava eruption of Icelandic volcano Bárðarbunga. To do so, we jointly analyse a set of SO2 observations from satellite (OMPS and IASI) and ground-level measurements from air quality monitoring stations together with high temporal resolution mass spectrometry measurements of an Aerosol Chemical Speciation Monitor (ACSM) performed far from the volcanic source. We explore month/year long ACSM data in France from stations in contrasting environments, close and far from industrial sulfur-rich activities. We demonstrate that volcanic sulfate aerosols exhibit a distinct chemical signature in urban/rural conditions, with NO3:SO4 mass concentration ratios lower than for non-volcanic background aerosols. These results are supported by thermodynamic simulations of aerosol composition, using the ISORROPIA II model, which show that ammonium sulfate aerosols are preferentially formed at a high concentration of sulfate, leading to a decrease in the production of particulate ammonium nitrate. Such a chemical signature is however more difficult to identify at heavily polluted industrial sites due to a high level of background noise in sulfur. Nevertheless, aged volcanic sulfates can be distinguished from freshly emitted industrial sulfates according to their contrasting degree of anion neutralization. Combining AERONET (AErosol RObotic NETwork) sunphotometric data with ACSM observations, we also show a long persistence over weeks of pollution in volcanic sulfate aerosols, while SO2 pollution disappears in a few days at most. Finally, gathering 6-month long datasets from 27 sulfur monitoring stations of the EMEP (European Monitoring and Evaluation Programme) network allows us to demonstrate a much broader large-scale European pollution, in both SO2 and SO4 , associated with the Holuhraun eruption, from Scandinavia to France. While widespread SO2 anomalies, with ground-level mass concentrations far exceeding background values, almost entirely result from the volcanic source, the origin of sulfate aerosols is more complex. Using a multi-site concentration-weighted trajectory analysis, emissions from the Holuhraun eruption are shown to be one of the main sources of SO4 at all EMEP sites across Europe and can be distinguished from anthropogenic emissions from eastern Europe but also from Great Britain. A wide variability in SO2:SO4 mass concentration ratios, ranging from 0.8 to 8.0, is shown at several stations geographically dispersed at thousands of kilometres from the eruption site. Despite this apparent spatial complexity, we demonstrate that these mass oxidation ratios can be explained by a simple linear dependency on the age of the plume, with a SO2-to-SO4 oxidation rate of 0.23 h−1. Most current studies generally focus on SO2, an unambiguous and more readily measured marker of the volcanic plume. However, the long persistence of the chemical fingerprint of volcanic sulfate aerosols at continental scale, as shown for the Holuhraun eruption here, casts light on the impact of tropospheric eruptions and passive degassing activities on air quality, health, atmospheric chemistry and climate.

Published
2019
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32. Solar UV Radiation in Saint-Denis, La Réunion and Cape Town, South Africa: 10 years Climatology and Human Exposure Assessment at Altitude

Author

Cadet, Jean-Maurice, Bencherif, Hassan, du Preez, David, Portafaix, Thierry, Sultan-Bichat, Nathalie, Belus, Matthias, Brogniez, Colette, Auriol, Frédérique, Metzger, Jean-Marc, Ncongwane, Katlego, Coetzee, Gerrie, Wright, Caradee, Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, University of KwaZulu-Natal [Durban, Afrique du Sud] (UKZN), University of Pretoria [South Africa], Centre Hospitalier Ouest Réunion, Conseil Régional de La Réunion, Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR), South African Weather Service (SAWS), Medical Research Council [South African], Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, University of KwaZulu-Natal (UKZN), Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS), and Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], South Africa, La Reunion, UV dose, hiking, lcsh:Meteorology. Climatology, ddc:610, lcsh:QC851-999, solar ultraviolet radiation, UV assessment, UV index, altitude
Abstract

Solar ultraviolet radiation (UVR) monitoring is important since it depends on several atmospheric parameters which are associated with climate change and since excess solar UVR exposure and has significant impacts on human health and wellbeing. The objective of this study was to investigate the trends in solar UVR during a decade (2009−2018) in Saint-Denis, Reunion Island (20.9°S, 55.5°E, 85 m ASL) and Cape Town, South Africa (33.97°S, 18.6°E, 42 m ASL). This comparison was done using total daily erythema exposure as derived from UVR sensors continuously at both sites. Climatology over the 10-year period showed extreme UVR exposure for both sites. Slight changes with opposite trends were found, +3.6% at Saint-Denis and −3.7% at Cape Town. However, these two sites often experience extreme weather conditions thereby making the trend evaluation difficult. Human exposure assessment was performed for hiking activities at two popular high-altitude hiking trails on the Maïdo−Grand Bénare (Reunion) and Table Mountain (Cape Town) with a handheld radiometer. Extreme exposure doses of 64 SED and 40 SED (Standard Erythemal Dose, 1 SED = 100 J.m−2) were recorded, respectively. These high exposure doses highlight the importance of raising public awareness on the risk related to excess UVR exposure at tourist sites, especially those at high altitude.

Published
2019
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33. Valdiation of the ORA spatial inversion algorithm with respect to the Stratospheric Aerosol and Gas Experiment II data

Author

Fussen, Didier, Arijs, Etienne, Nevejans, Dennis, Hellemont, Filip van, Brogniez, Colette, and Lenoble, Jacqueline

Subjects
Radiometers -- Usage, Atmospheric research -- Equipment and supplies, Stratospheric circulation -- Research, Occultations -- Research, Astronomy, Physics
Abstract

We present the results of a comparison of the total extinction altitude profiles measured at the same time and at same location by the ORA (Occultation Radiometer) and Stratospheric Aerosol and Gas Experiment II solar occultation experiments at three different wavelengths. A series of 25 events for which the grazing points of both experiments lie within a 2 [degrees] window has been analyzed. The mean relative differences observed over the altitude range 15-45 km are -8.4%, 1.6%, and 3% for the three channels (0.385, 0.6, and 1.02 [[micro]meter]). Some systematic degradation occurs below 20 km (as the result of signal saturation and possible cloud interference) and above 40 km (low absorption). The fair general agreement between the extinction profiles obtained by two different instruments enhances our confidence in the results of the ORA experiment and of the recently developed vertical inversion algorithm applied to real data.

Published
1998

34. Clear-sky ultraviolet radiation modelling using output from the Chemistry Climate Model Initiative

Author

Lamy, Kévin, Portafaix, Thierry, Josse, Béatrice, Brogniez, Colette, Godin-Beekmann, Sophie, Bencherif, Hassan, Revell, Laura, Akiyoshi, Hideharu, Bekki, Slimane, Hegglin, Michaela I., Jöckel, Patrick, Kirner, Oliver, Liley, Ben, Marecal, Virginie, Morgenstern, Olaf, Stenke, Andrea, Zeng, Guang, Abraham, N. Luke, Archibald, Alexander T., Butchart, Neil, Chipperfield, Martyn P., Di Genova, Glauco, Deushi, Makoto, Dhomse, Sandip S., Hu, Rong-Ming, Kinnison, Douglas, Kotkamp, Michael, McKenzie, Richard, Michou, Martine, O&amp, apos, Connor, Fiona M., Oman, Luke D., Pitari, Giovanni, Plummer, David A., Pyle, John A., Rozanov, Eugene, Saint-Martin, David, Sudo, Kengo, Tanaka, Taichu Y., Visioni, Daniele, and Yoshida, Kohei

Subjects
DATA processing & computer science, ddc:004
Abstract

We have derived values of the ultraviolet index (UVI) at solar noon using the Tropospheric Ultraviolet Model (TUV) driven by ozone, temperature and aerosol fields from climate simulations of the first phase of the Chemistry-Climate Model Initiative (CCMI-1). Since clouds remain one of the largest uncertainties in climate projections, we simulated only the clear-sky UVI. We compared the modelled UVI climatologies against present-day climatological values of UVI derived from both satellite data (the OMI-Aura OMUVBd product) and ground-based measurements (from the NDACC network). Depending on the region, relative differences between the UVI obtained from CCMI/TUV calculations and the ground-based measurements ranged between −5.9 % and 10.6 %. We then calculated the UVI evolution throughout the 21st century for the four Representative Concentration Pathways (RCPs 2.6, 4.5, 6.0 and 8.5). Compared to 1960s values, we found an average increase in the UVI in 2100 (of 2 %–4 %) in the tropical belt (30∘ N–30∘ S). For the mid-latitudes, we observed a 1.8 % to 3.4 % increase in the Southern Hemisphere for RCPs 2.6, 4.5 and 6.0 and found a 2.3 % decrease in RCP 8.5. Higher increases in UVI are projected in the Northern Hemisphere except for RCP 8.5. At high latitudes, ozone recovery is well identified and induces a complete return of mean UVI levels to 1960 values for RCP 8.5 in the Southern Hemisphere. In the Northern Hemisphere, UVI levels in 2100 are higher by 0.5 % to 5.5 % for RCPs 2.6, 4.5 and 6.0 and they are lower by 7.9 % for RCP 8.5. We analysed the impacts of greenhouse gases (GHGs) and ozone-depleting substances (ODSs) on UVI from 1960 by comparing CCMI sensitivity simulations (1960–2100) with fixed GHGs or ODSs at their respective 1960 levels. As expected with ODS fixed at their 1960 levels, there is no large decrease in ozone levels and consequently no sudden increase in UVI levels. With fixed GHG, we observed a delayed return of ozone to 1960 values, with a corresponding pattern of change observed on UVI, and looking at the UVI difference between 2090s values and 1960s values, we found an 8 % increase in the tropical belt during the summer of each hemisphere. Finally we show that, while in the Southern Hemisphere the UVI is mainly driven by total ozone column, in the Northern Hemisphere both total ozone column and aerosol optical depth drive UVI levels, with aerosol optical depth having twice as much influence on the UVI as total ozone column does.

Published
2019

35. Success of Montreal Protocol Demonstrated by Comparing High-Quality UV Measurements with “World Avoided” Calculations from Two Chemistry-Climate Models

Author

McKenzie, Richard, primary, Bernhard, Germar, additional, Liley, Ben, additional, Disterhoft, Patrick, additional, Rhodes, Steve, additional, Bais, Alkiviadis, additional, Morgenstern, Olaf, additional, Newman, Paul, additional, Oman, Luke, additional, Brogniez, Colette, additional, and Simic, Stana, additional

Published
2019
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36. Clear-sky ultraviolet radiation modelling using output from the Chemistry Climate Model Initiative

Author

Lamy, Kévin, primary, Portafaix, Thierry, additional, Josse, Béatrice, additional, Brogniez, Colette, additional, Godin-Beekmann, Sophie, additional, Bencherif, Hassan, additional, Revell, Laura, additional, Akiyoshi, Hideharu, additional, Bekki, Slimane, additional, Hegglin, Michaela I., additional, Jöckel, Patrick, additional, Kirner, Oliver, additional, Liley, Ben, additional, Marecal, Virginie, additional, Morgenstern, Olaf, additional, Stenke, Andrea, additional, Zeng, Guang, additional, Abraham, N. Luke, additional, Archibald, Alexander T., additional, Butchart, Neil, additional, Chipperfield, Martyn P., additional, Di Genova, Glauco, additional, Deushi, Makoto, additional, Dhomse, Sandip S., additional, Hu, Rong-Ming, additional, Kinnison, Douglas, additional, Kotkamp, Michael, additional, McKenzie, Richard, additional, Michou, Martine, additional, O'Connor, Fiona M., additional, Oman, Luke D., additional, Pitari, Giovanni, additional, Plummer, David A., additional, Pyle, John A., additional, Rozanov, Eugene, additional, Saint-Martin, David, additional, Sudo, Kengo, additional, Tanaka, Taichu Y., additional, Visioni, Daniele, additional, and Yoshida, Kohei, additional

Published
2019
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37. Large-scale particulate air pollution and chemical fingerprint of volcanic sulfate aerosols from the 2014-15 Holuhraun flood lava eruption of Bárðarbunga volcano (Iceland)

Author

Boichu, Marie, primary, Favez, Olivier, additional, Riffault, Véronique, additional, Brogniez, Colette, additional, Sciare, Jean, additional, Chiapello, Isabelle, additional, Clarisse, Lieven, additional, Zhang, Shouwen, additional, Pujol-Söhne, Nathalie, additional, Tison, Emmanuel, additional, Delbarre, Hervé, additional, and Goloub, Philippe, additional

Published
2019
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38. Supplementary material to "Large-scale particulate air pollution and chemical fingerprint of volcanic sulfate aerosols from the 2014-15 Holuhraun flood lava eruption of Bárðarbunga volcano (Iceland)"

Author

Boichu, Marie, primary, Favez, Olivier, additional, Riffault, Véronique, additional, Brogniez, Colette, additional, Sciare, Jean, additional, Chiapello, Isabelle, additional, Clarisse, Lieven, additional, Zhang, Shouwen, additional, Pujol-Söhne, Nathalie, additional, Tison, Emmanuel, additional, Delbarre, Hervé, additional, and Goloub, Philippe, additional

Published
2019
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39. UV-Indien Network ground-based measurements: comparisons with satellite and model estimates of UV radiation over the Western Indian Ocean.

Author

Lamy, Kevin, Portafaix, Thierry, Brogniez, Colette, Lakkala, Kaisa, Pitkänen, Mikko R. A., Arola, Antti, Forestier, Jean-Baptiste, Amelie, Vincent, Toihir, Mohamed Abdoulwahab, and Rakotoniaina, Solofoarisoa

Subjects
ULTRAVIOLET radiation, OZONE layer depletion, INTERNET usage monitoring, OCEAN
Abstract

As part of the UV-Indien Network, 9 ground-based stations have been equipped with one spectroradiometer, radiometers and all-sky cameras. These stations are homogeneously distributed in 5 countries of the Western Indian Ocean region (Comoros, France, Madagascar, Mauritius and Seychelles), a part of the world where almost no measurements have been made so far. The main scienti?c objectives of this network are to study the annual and inter-annual variability of the ultraviolet (UV) radiation in this area, to validate the output of numerical models and satellite estimates of ground-based UV measurements, and to monitor UV radiation in the context of climate change and projected ozone depletion in this region. The ?rst results are presented here for the oldest stations (Antananarivo, Anse Quitor, Mahé and Saint-Denis). Ground-based measurements of UV index (UVI) are compared against satellite estimates (Ozone Monitoring Instrument (OMI), the TROPOspheric Monitoring Instrument (TROPOMI), the Global Ozone Monitoring Experiment (GOME) and model forecasts of UVI (Tropospheric Emission Monitoring Internet Service (TEMIS) and Copernicus Atmospheric Monitoring Service (CAMS). The median relative differences between satellite or model estimates and ground-based measurements of clear-sky UVI range between -34.5 % and 15.8 %. Under clear skies, the smallest UVI median difference between the satellites or model estimates and the measurements of ground-based instruments is found to be 0.02 (TROPOMI), 0.04 (OMI), -0.1 (CAMS) and -0.4 (CAMS) at St-Denis, Antananarivo, Anse Quitor and Mahé respectively. The cloud fraction and UVI diurnal pro?le are calculated for these four stations. The mean UVI values at local solar noon range between 10 (Antananarivo, Anse Quitor and Saint-Denis) and 14 at Mahé. The mean UVIs in clear-sky conditions are higher than mean UVI in all-sky conditions, although it can still be noted that UVI maxima are higher for all-sky conditions than for clear sky conditions. This is the result of UVI enhancement induced by clouds, observed at these four stations. The greatest increase in UV radiation under cloudy conditions was observed at the Mahé station, with increases of more than 4. The data used in this study is available at https://doi.org/10.5281/zenodo.4572026 (Lamy and Portafaix, 2021). [ABSTRACT FROM AUTHOR]

Published
2021
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40. Ultraviolet radiation modelling from ground-based and satellite measurements on Reunion Island, southern tropics

Author

Lamy, Kévin, Portafaix, Thierry, Brogniez, Colette, Godin-Beekmann, Sophie, Bencherif, Hassan, Morel, Béatrice, Pazmino, Andrea, Metzger, Jean-Marc, Auriol, Frédérique, Deroo, Christine, Duflot, Valentin, Goloub, Philippe, Long, Charles N., Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), School of Chemistry and Physics [Durban], University of KwaZulu-Natal [Durban, Afrique du Sud] (UKZN), Energy Lab (ENERGY Lab), Université de La Réunion (UR), Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), Observatoire de Physique de l’Atmosphère à la Réunion (OPAR)Université de la RéunionINSU, Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), University of KwaZulu-Natal (UKZN), and Laboratoire d'Energétique, d'Electronique et Procédés (LE2P)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; Surface ultraviolet radiation (SUR) is not an increasing concern after the implementation of the Montreal Protocol and the recovery of the ozone layer (Morgenstern et al., 2008). However large uncertainties remain in the prediction of the future changes of SUR (Bais et al., 2015). It has long been known that its variability depends on ozone levels and also on clouds, aerosol and albedo. It is therefore essential to monitor its evolution in the context of global change. Unfortunately there are 5 few ground-based stations measuring surface UV irradiance in the southern tropics and particularly in the Indian Ocean, and long-term time series are required to study SUR variability and its relationship to ozone and to detect trends.Reunion Island is located in the tropics (21S, 55E), in a part of the world where the amount of ozone in the ozone column is naturally low. In addition, this island is mountainous and the marine atmosphere is often clean with low aerosol concentrations. Thus, measurements show much higher SUR than at other sites at the same latitude or at mid-latitudes. Several studies 10 pointed out that UV-B impacts the biosphere (Erickson III et al., 2015), especially aquatic system, which plays a central part in biogeochemical cycle (Hader et al., 2007). It can affect phytoplankton productivity (Smith and Cullen, 1995). This influence can result in either positive or negative feedback on climate (Zepp et al., 2007). In order to quantify the future evolution of SUR in the tropics, it is necessary to validate a model against present observations. This study is designed to be a preliminary parametric and sensitivity study of SUR modelling in the tropics.Ground-based measurements of SUR have been performed at Reunion Island by a BENTHAM DTMc300 spectroradiometer since 2009. This instrument is part of the Network for the Detection of Atmospheric Composition Change (NDACC). In this study, we used the UltraViolet Index in order to quantify SUR radiation integratively.

Published
2018
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41. Ultraviolet Radiation evolution during the 21st century

Author

Lamy, Kévin, Josse, Béatrice, Portafaix, Thierry, Bencherif, Hassan, Godin-Beekmann, Sophie, Brogniez, Colette, Abraham, N. L., Akiyoshi, H., Archibald, A. T., Bekki, Slimane, Butchart, N., Chipperfield, Martyn P., Currie, R., Di Genova, Glauco, Garcia, R. R., Deushi, Makoto, Dhomse, Sandip, Duncan, B. N., Hegglin, M. I., Horowitz, L. W., Jöckel, P., Kinnison, D., Lamarque, J. F., Lin, M. Y., Mancini, E., Marchand, Marion, Marécal, Virginie, Michou, M., Morgenstern, Olaf, O'Connor, F. M., Nagashima, T., Oman, L. D., Pitari, G., Plummer, D., Pyle, J. A., Revell, Laura E., Rozanov, E., Saint-Martin, D., Scinocca, J. F., Stenke, A., Strahan, S. E., Stone, K., Sudo, K., Tanaka, T. Y., Tilmes, S., Yamashita, Y., Yoshida, K., Zeng, G., Laboratoire de l'Atmosphère et des Cyclones (LACy), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France, Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS), STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Department of Chemistry [Cambridge, UK], University of Cambridge [UK] (CAM), National Institute for Environmental Studies (NIES), Met Office Hadley Centre for Climate Change (MOHC), United Kingdom Met Office [Exeter], School of Earth and Environment [Leeds] (SEE), University of Leeds, University of L'Aquila [Italy] (UNIVAQ), National Center for Atmospheric Research [Boulder] (NCAR), Meteorological Research Institute [Tsukuba] (MRI), Japan Meteorological Agency (JMA), NASA Goddard Space Flight Center (GSFC), Department of Meteorology [Reading], University of Reading (UOR), NOAA Geophysical Fluid Dynamics Laboratory (GFDL), National Oceanic and Atmospheric Administration (NOAA), DLR Institut für Physik der Atmosphäre (IPA), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), Dipartimento di Scienze Fisiche e Chimiche [L'Aquila], Università degli Studi dell'Aquila (UNIVAQ), National Institute of Water and Atmospheric Research [Lauder] (NIWA), Environment and Climate Change Canada, Institute for Atmospheric and Climate Science [Zürich] (IAC), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Bodeker Scientific, School of Earth Sciences [Melbourne], Faculty of Science [Melbourne], University of Melbourne-University of Melbourne, Graduate School of Environmental Studies [Nagoya], Nagoya University, National Institute of Water and Atmospheric Research [Auckland] (NIWA), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Università degli Studi dell'Aquila = University of L'Aquila (UNIVAQ)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
Abstract

International audience; In the context of a changing climate, the acceleration of the Brewer-Dobson circulation [Butchart 2014] leadsto a decrease of the ozone total column in the tropics. This decrease affects directly surface ultraviolet radiation,which are already very high in this area. Following the work of (Bais et al., 2011), (Butchart, 2014)and (Hegglin & Shepherd, 2009) on the future evolution of surface irradiance derived from Chemistry ClimateModels (CCM) projections, we projected here surface irradiance from 2010 to 2100 with focus on the tropics.We used the latest chemistry climate projection exercise ; Chemistry Climate Model Initiative (CCMI) coupledwith a radiative transfer model (TUV (Madronich, 1993)) to calculate the evolution of surface Ultravioletradiation throughout the 21st century. Ultraviolet Index (UVi) has been specifically considered (McKenzie,Matthews, & Johnston, 1991).At first, simulation from RefC2 Chemistry Climate Model Initiative have been coupled with a radiativetransfer model, in order to obtained modeled UV index (UVi-M). UVi-M is then compared against availablesatellite ultraviolet radiation observations (OMI OMUVbd product) between 2005 and 2016. Statistical differenceand variance have been analysed versus different parameters: geographical location, model or ensembleof model outputs used in the radiative transfer calculation.

Published
2017

42. Validation of TROPOMI Surface UV Radiation Product.

Author

Lakkala, Kaisa, Kujanpää, Jukka, Brogniez, Colette, Henriot, Nicolas, Arola, Antti, Aun, Margit, Auriol, Frédérique, F. Bais, Alkiviadis, Bernhard, Germar, De Bock, Veerle, Catalfamo, Maxime, Deroo, Christine, Diémoz, Henri, Egli, Luca, Forestier, Jean-Baptiste, Fountoulakis, Ilias, Delia Garcia, Rosa, Gröbner, Julian, Hassinen, Seppo, and Heikkilä, Anu

Subjects
ALBEDO, ULTRAVIOLET radiation, ATMOSPHERIC composition, FREE surfaces, CLIMATE research, SNOW, PRODUCT quality
Abstract

The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5 Precursor (S5P) satellite was launched on 13 October 2017 to provide the atmospheric composition for atmosphere and climate research. The S5P is a sun-synchronous polar-orbiting satellite providing global daily coverage. The TROPOMI swath is 2600 km wide, and the ground resolution for most data products is 7.2 x 3.5 km2 (5.6 x 3.5 km2 since 6 August 2019) at nadir. The Finnish Meteorological Institute (FMI) is responsible for the development and processing of the TROPOMI Surface Ultraviolet (UV) Radiation Product which includes 36 UV parameters in total. Ground-based data from 25 sites located in arctic, subarctic, temperate, equatorial and antarctic areas were used for validation of TROPOMI overpass irradiance at 305, 310, 324 and 380 nm, overpass erythemally weighted dose rate/UV index and erythemally weighted daily dose for the period from 1 January 2018 to 31 August 2019. The validation results showed that for most sites 60-80 % of TROPOMI data was within ±20 % from ground-based data for snow free surface conditions. The median relative differences to ground-based measurements of TROPOMI snow free surface daily doses were within ±10 % and ±5 % at two thirds and at half of the sites, respectively. At several sites more than 90 % of clear sky TROPOMI data were within ±20 % from ground-based measurements. Generally median relative differences between TROPOMI data and ground-based measurements were a little biased towards negative values, but at high latitudes where non-homogeneous topography and albedo/snow conditions occurred, the negative bias was exceptionally high, from -30 % to -65 %. Positive biases of 10-15 % were also found for mountainous sites due to challenging topography. The TROPOMI Surface UV Radiation Product includes quality flags to detect increased uncertainties in the data due to heterogeneous surface albedo and rough terrain which can be used to filter the data retrieved under challenging conditions. [ABSTRACT FROM AUTHOR]

Published
2020
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43. Ultraviolet Radiation modelling using output from the Chemistry Climate Model Initiative

Author

Lamy, Kévin, primary, Portafaix, Thierry, additional, Josse, Béatrice, additional, Brogniez, Colette, additional, Godin-Beekmann, Sophie, additional, Bencherif, Hassan, additional, Revell, Laura, additional, Akiyoshi, Hideharu, additional, Bekki, Slimane, additional, Hegglin, Michaela I., additional, Jöckel, Patrick, additional, Kirner, Oliver, additional, Marecal, Virginie, additional, Morgenstern, Olaf, additional, Stenke, Andrea, additional, Zeng, Guang, additional, Abraham, N. Luke, additional, Archibald, Alexander T., additional, Butchart, Neil, additional, Chipperfield, Martyn P., additional, Di Genova, Glauco, additional, Deushi, Makoto, additional, Dhomse, Sandip S., additional, Hu, Rong-Ming, additional, Kinnison, Douglas, additional, Michou, Martine, additional, O'Connor, Fiona M., additional, Oman, Luke D., additional, Pitari, Giovanni, additional, Plummer, David A., additional, Pyle, John A., additional, Rozanov, Eugene, additional, Saint-Martin, David, additional, Sudo, Kengo, additional, Tanaka, Taichu Y., additional, Visioni, Daniele, additional, and Yoshida, Kohei, additional

Published
2018
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45. Model Simulations of the Chemical and Aerosol Microphysical Evolution of the Sarychev Peak 2009 (SO2, HCl, Particles) Eruption Cloud compared to In Situ and Satellite Observations

Author

AGU Fall meeting 2018 (Washington, D.C.), Roberts, Tjarda Jane, Lurton, Thibaut, Jégou, Fabrice, Berthet, Gwenaël, Renard, Jean-Baptiste, Clarisse, Lieven, Schmidt, Anja, Brogniez, Colette, AGU Fall meeting 2018 (Washington, D.C.), Roberts, Tjarda Jane, Lurton, Thibaut, Jégou, Fabrice, Berthet, Gwenaël, Renard, Jean-Baptiste, Clarisse, Lieven, Schmidt, Anja, and Brogniez, Colette

Abstract

info:eu-repo/semantics/nonPublished

Published
2018

46. Model simulations of the chemical and aerosol microphysical evolution of the Sarychev Peak 2009 eruption cloud compared to in situ and satellite observations

Author

Lurton, Thibaut, Jégou, Fabrice, Berthet, Gwenaël, Renard, Jean-Baptiste, Clarisse, Lieven, Schmidt, Anja, Brogniez, Colette, Roberts, Tjarda Jane, Lurton, Thibaut, Jégou, Fabrice, Berthet, Gwenaël, Renard, Jean-Baptiste, Clarisse, Lieven, Schmidt, Anja, Brogniez, Colette, and Roberts, Tjarda Jane

Abstract

Volcanic eruptions impact climate through the injection of sulfur dioxide (SO2), which is oxidized to form sulfuric acid aerosol particles that can enhance the stratospheric aerosol optical depth (SAOD). Besides large-magnitude eruptions, moderate-magnitude eruptions such as Kasatochi in 2008 and Sarychev Peak in 2009 can have a significant impact on stratospheric aerosol and hence climate. However, uncertainties remain in quantifying the atmospheric and climatic impacts of the 2009 Sarychev Peak eruption due to limitations in previous model representations of volcanic aerosol microphysics and particle size, whilst biases have been identified in satellite estimates of post-eruption SAOD. In addition, the 2009 Sarychev Peak eruption co-injected hydrogen chloride (HCl) alongside SO2, whose potential stratospheric chemistry impacts have not been investigated to date. We present a study of the stratospheric SO2-particle-HCl processing and impacts following Sarychev Peak eruption, using the Community Earth System Model version 1.0 (CESM1) Whole Atmosphere Community Climate Model (WACCM)-Community Aerosol and Radiation Model for Atmospheres (CARMA) sectional aerosol microphysics model (with no a priori assumption on particle size). The Sarychev Peak 2009 eruption injected 0.9ĝ€Tg of SO2 into the upper troposphere and lower stratosphere (UTLS), enhancing the aerosol load in the Northern Hemisphere. The post-eruption evolution of the volcanic SO2 in space and time are well reproduced by the model when compared to Infrared Atmospheric Sounding Interferometer (IASI) satellite data. Co-injection of 27ĝ€Ggĝ€†HCl causes a lengthening of the SO2 lifetime and a slight delay in the formation of aerosols, and acts to enhance the destruction of stratospheric ozone and mono-nitrogen oxides (NOx) compared to the simulation with volcanic SO2 only. We therefore highlight the need to account for volcanic halogen chemistry when simulating the impact of eruptions such as Sarychev on, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2018

47. Ultraviolet Radiation modeling from ground based and satellite measurements of Ozone over Réunion Island

Author

Lamy, Kévin, Portafaix, Thierry, Bencherif, Hassan, Godin-Beekmann, Sophie, Brogniez, Colette, Metzger, Jean-Marc, Pazmino, Andrea, Long, C. N., Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), NOAA Earth System Research Laboratory (ESRL), National Oceanic and Atmospheric Administration (NOAA), and Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Météo France

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; Surface ultraviolet radiation is an increasing concern for human health. Its variability is well-known to depend on ozone levels but also on aerosols, clouds, and albedo. Reunion Island is located in the tropics, where ozone column is rather low. In addition, this island is mountainous and the marine atmosphere is often clean with low aerosol concentration. Thus, measurements shows much higher UV index compared to other site at the same latitude or at mid-latitude.1In order to study ultraviolet radiation variability and its relationship to ozone, we need long-term data series to be able to detect trends. There are only a few ground-based measurements of surface irradiance in the Indian Ocean and for a limited time period, we want to reproduce these data from parameters governing surface uv radiation, and extend these series for longer period. To do so, we have developed a local parametrization using Tropospheric Ultraviolet and Visible Model (TUV2) and compared it to multiple years of ground based measurements of surface irradiance obtained from a BENTHAM DM300 spectroradiometer starting from early 2009 to present.This spectroradiometer is composed of a two monochromators and has a wavelength range of 280-450 nm. In this study, we used action spectrum published by the International Commission on Illumination to calculate erythemal weighted and vitamin D weighted ultraviolet.Only clear-sky ultraviolet radiations are modeled, therefore we need to sort-out clear sky measurements. We used observer’s reports as a first approximation to detect cloudy conditions and from there fit our clear-sky points with a gaussian function in order to establish long-term clear-sky measurements. We also follow Long and Ackerman3 methods to determine clear-sky conditions from solar irradiance.Multiple model inputs have been tested and evaluated against observations. For ozone total column we used ground based measurements from SAOZ spectrometer and satellite measurements from OMI and SBUV instruments, ozone profile come from radio-soundings and DIAL lidar operated locally. Aerosol optical properties come from a local aerosol climatology established using a CIMEL photometer.

Published
2016

49. Ultraviolet Radiation modelling from ground based and satellite measurements at Reunion Island, Southern Tropics

Author

Lamy, Kévin, primary, Portafaix, Thierry, additional, Brogniez, Colette, additional, Godin-Beekmann, Sophie, additional, Bencherif, Hassan, additional, Morel, Béatrice, additional, Pazmino, Andrea, additional, Metzger, Jean Marc, additional, Auriol, Frédérique, additional, Deroo, Christine, additional, Duflot, Valentin, additional, Goloub, Philippe, additional, and Long, Charles N., additional

Published
2017
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50. Supplementary material to "Ultraviolet Radiation modelling from ground based and satellite measurements at Reunion Island, Southern Tropics"

Author

Lamy, Kévin, primary, Portafaix, Thierry, additional, Brogniez, Colette, additional, Godin-Beekmann, Sophie, additional, Bencherif, Hassan, additional, Morel, Béatrice, additional, Pazmino, Andrea, additional, Metzger, Jean Marc, additional, Auriol, Frédérique, additional, Deroo, Christine, additional, Duflot, Valentin, additional, Goloub, Philippe, additional, and Long, Charles N., additional

Published
2017
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