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15 results on '"Aaltonen, Veijo"'

1. Aerosol remote sensing in polar regions

Author

Tomasi, Claudio, Kokhanovsky, Alexander A., Lupi, Angelo, Ritter, Christoph, Smirnov, Alexander, O'Neill, Norman T., Stone, Robert S., Holben, Brent N., Nyeki, Stephan, Wehrli, Christoph, Stohl, Andreas, Mazzola, Mauro, Lanconelli, Christian, Vitale, Vito, Stebel, Kerstin, Aaltonen, Veijo, de Leeuw, Gerrit, Rodriguez, Edith, Herber, Andreas B., Radionov, Vladimir F., Zielinski, Tymon, Petelski, Tomasz, Sakerin, Sergey M., Kabanov, Dmitry M., Xue, Yong, Mei, Linlu, Istomina, Larysa, Wagener, Richard, McArthur, Bruce, Sobolewski, Piotr S., Kivi, Rigel, Courcoux, Yann, Larouche, Pierre, Broccardo, Stephen, and Piketh, Stuart J.

Published
2015
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2. New continuous total ozone, UV, VIS and PAR measurements at Marambio 64° S, Antarctica

Author

Lakkala, Kaisa, Aun, Margit, Sanchez, Ricardo, Bernhard, Germar, Asmi, Eija, Meinander, Outi, Nollas, Fernando, Hülsen, Gregor, Aaltonen, Veijo, Arola, Antti, and Leeuw, Gerrit

Abstract

A GUV multifilter radiometer was set up at Marambio, 64° S 56° W, Antarctica, in 2017. The instrument measures continuously ultraviolet (UV) radiation, visible (VIS) radiation and photosynthetically active radiation (PAR). The measurements are designed for providing high quality long-term time series which can be used to assess the impact of global climate change in the Antarctic region. The quality assurance includes regular absolute calibrations and solar comparisons performed at the site and at Sodankylä, Finland. The actual measurements continue the time series measured at Marambio with NILU-UV radiometers during 2000–2010 as part of the Antarctic NILU-UV network. They are optimal for assessing the effects of the ongoing stratospheric ozone recovery on the ecosystem as the data products include information on radiation at various wavelengths ranging from UV to VIS so that changes on biologically effective radiation due to ozone can be separated from those due to other factors. The final data products are total ozone, PAR, VIS radiation at 555 nm, UV index, UV irradiance at 5 channels, UVB and UVA dose rate/daily dose, and biologically weighted UV dose rate/ daily dose, including 10 different action spectra. The data from the last five days and the daily maximum UV index time series are plotted and updated daily on the web page fmiarc.fmi.fi/sub_sites/GUVant/. The first two years of UV measurements were very different in terms of the results: The monthly average of daily maximum UVB dose rates were clearly higher in 2018 than in 2017 during the period from October to December. The largest difference was observed in October, when the average of daily maximum UVB dose rates was 7.6 kWm−2 and 10.2 kWm−2 in 2017 and 2018, respectively. The monthly averages were close to each other for all the three months in 2018, while in 2017 the monthly average of October was lower than those of November and December. VIS and PAR time series show that daily maxima in 2018–2019 exceed those in 2017–2018 during the late spring and the summer (mid-November–January). The studied dataset is freely accessible at https://doi.org/10.5281/zenodo.3553634 (Lakkala et al.,2019).

Published
2019

3. Solar UV radiation measurements in Marambio, Antarctica, during years 2017–2019

Author

Aun, Margit, primary, Lakkala, Kaisa, additional, Sanchez, Ricardo, additional, Asmi, Eija, additional, Nollas, Fernando, additional, Meinander, Outi, additional, Sogacheva, Larisa, additional, De Bock, Veerle, additional, Arola, Antti, additional, de Leeuw, Gerrit, additional, Aaltonen, Veijo, additional, Bolsée, David, additional, Cizkova, Klara, additional, Mangold, Alexander, additional, Metelka, Ladislav, additional, Jakobson, Erko, additional, Svendby, Tove, additional, Gillotay, Didier, additional, and Van Opstal, Bert, additional

Published
2020
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6. UV radiation measurements in Marambio, Antarctica during years 2017–2019 in a wider temporal and spatial context

Author

Aun, Margit, primary, Lakkala, Kaisa, additional, Sanchez, Ricardo, additional, Asmi, Eija, additional, Nollas, Fernando, additional, Meinander, Outi, additional, Sogacheva, Larisa, additional, De Bock, Veerle, additional, Arola, Antti, additional, de Leeuw, Gerrit, additional, Aaltonen, Veijo, additional, Bolsee, David, additional, Cizkova, Klara, additional, Mangold, Alexander, additional, Metelka, Ladislav, additional, Jakobson, Erko, additional, Svendby, Tove, additional, Gillotay, Didier, additional, and Van Opstal, Bert, additional

Published
2019
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7. UV radiation measurements in Marambio, Antarctica during years 2017-2019 in a wider temporal and spatial context.

Author

Aun, Margit, Lakkala, Kaisa, Sanchez, Ricardo, Asmi, Eija, Nollas, Fernando, Meinander, Outi, Sogacheva, Larisa, De Bock, Veerle, Arola, Antti, de Leeuw, Gerrit, Aaltonen, Veijo, Bolsee, David, Cizkova, Klara, Mangold, Alexander, Metelka, Ladislav, Jakobson, Erko, Svendby, Tove, Gillotay, Didier, and Van Opstal, Bert

Abstract

In March 2017, ultraviolet (UV) radiation measurements with a multichannel GUV-2511 radiometer were started in Marambio, Antarctica (64.23° S; 56.62° W), by the Finnish Meteorological Institute (FMI) in collaboration with the Argentinian National Meteorological Service (SMN). These measurements were analysed and the results were compared to previous measurements at the same site with NILU-UV radiometer during 2000-2008 and to data from five stations across Antarctica. Measurements in Marambio showed lower UV radiation levels in 2017/2018 compared to those measured during 2000-2008. Also at several other stations in Antarctica the radiation levels were below average in that period. The maximum UV index (UVI) in Marambio was only 6.2, while, during the time period 2000-2008, the maximum was 12. In 2018/2019, the radiation levels were higher than in the previous year and the maximum UVI recorded in Marambio was 9.5. In Marambio, the largest variation of the UV radiation are during the spring and early summer when the stratospheric ozone concentration is at a minimum (the so-called ozone hole). Beside cloud cover, the strength of the polar vortex and the stratospheric ozone depletion are the primary factors that influence the surface UV radiation levels in Antarctica. As the recovery of the ozone layer is slow, the continuation of the measurements is crucial in order to be able to detect long-term changes in UV levels in Antarctica. [ABSTRACT FROM AUTHOR]

Published
2019
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8. Primary sources control the variability of aerosol optical properties in the Antarctic Peninsula

Author

Asmi, Eija, primary, Neitola, Kimmo, additional, Teinilä, Kimmo, additional, Rodriguez, Edith, additional, Virkkula, Aki, additional, Backman, John, additional, Bloss, Matthew, additional, Jokela, Jesse, additional, Lihavainen, Heikki, additional, De Leeuw, Gerrit, additional, Paatero, Jussi, additional, Aaltonen, Veijo, additional, Mei, Miguel, additional, Gambarte, Gonzalo, additional, Copes, Gustavo, additional, Albertini, Marco, additional, Fogwill, Germán Pérez, additional, Ferrara, Jonathan, additional, Barlasina, María Elena, additional, and Sánchez, Ricardo, additional

Published
2018
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14. SNORTEX (Snow Reflectance Transition Experiment): Remote sensing measurement of the dynamic properties of the boreal snow-forest in support to climate and weather forecast: Report of IOP-2008

Author

Roujean, Jean-Louis, primary, Manninen, Terhikki, additional, Kontu, Anna, additional, Peltoniemi, Jouni, additional, Hautecoeur, Olivier, additional, Riihela, Aku, additional, Lahtinen, Panu, additional, Siljamo, Niilo, additional, Lotjonen, Milla, additional, Suokanerva, Hanne, additional, Sukuvaara, Timo, additional, Kaasalainen, Sanna, additional, Aulamo, Osmo, additional, Aaltonen, Veijo, additional, Tholix, Laura, additional, Karhu, Juha, additional, Suomalainen, Juha, additional, Hakala, Teemu, additional, and Kaartinen, Harri, additional

Published
2009
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15. Aerosol optical properties in Finland during Russian forest fires in 2010.

Author

Aaltonen, Veijo, Rodriguez, Edith, Sogacheva, Larisa, Aalto, Pasi, Komppula, Mika, Hirsikko, Anne, Arola, Antti, and de Leeuw, Gerrit

Subjects
*OPTICAL properties of atmospheric aerosols, *FOREST fires, *POLLUTION, *LIGHT scattering, *EARTH temperature
Abstract

Effects of the pollution plume originating from the Russian forest fires in summer 2010 on the aerosol properties in Finland were analyzed. Main properties were AOD and AE measured with Cimel and PFR sun photometers at five stations. In addition, scattering and absorption coefficient, aerosol particle number concentration and meteorological parameters were measured on the surface air. AATSR and MODIS AOD data were used to get a picture about the regional distribution of the plume. Two clear extreme periods of the AOD were observed. On 30th July, the maximum AOD was detected in Sodankyla¨, being 0.9 at 550 nm. A more impressive episode was between the 6th and 8th of August, when the extreme AOD of 1.5 was measured in Kuopio. In-situ observations suggest that the major part of the aerosol was residing in the well mixed layer coupled with the surface. [ABSTRACT FROM AUTHOR]

Published
2013
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