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113 results on '"Brohede, S."'

1. OSIRIS : A Decade of Scattered Light

Author

McLinden, C. A., Bourassa, A. E., Brohede, S., Cooper, M., Degenstein, D. A., Evans, W. J. F., Gattinger, R. L., Haley, C. S., Llewellyn, E. J., Lloyd, N. D., Loewen, P., Martin, R. V., McConnell, J. C., McDade, I. C., Murtagh, D., Rieger, L., von Savigny, C., Sheese, P. E., Sioris, C. E., Solheim, B., and Strong, K.

Published
2012

6. The OSIRIS instrument on the Odin spacecraft

Author

Llewellyn, E J, Lloyd, N D, Degenstein, D A, Gattinger, R L, Petelina, S V, Bourassa, A E, Wiensz, J T, Ivanov, E V, McDade, I C, Solheim, B H, McConnell, J C, Haley, C S, von Savigny, C, Sioris, C E, McLinden, C A, Griffioen, E, Kaminski, J, Evans, W FJ, Puckrin, E, Strong, K, Wehrle, V, Hum, R H, Kendall, D JW, Matsushita, J, Murtagh, D P, Brohede, S, Stegman, J, Witt, G, Barnes, G, Payne, W F, Piché, L, Smith, K, Warshaw, G, Deslauniers, D-L, Marchand, P, Richardson, E H, King, R A, Wevers, I, McCreath, W, Kyrölä, E, Oikarinen, L, Leppelmeier, G W, Auvinen, H, Mégie, G, Hauchecorne, A, Lefèvre, F, de La Nöe, J, Ricaud, P, Frisk, U, Sjoberg, F, von Schéele, F, and Nordh, L

Published
2004

7. The SPARC Data Initiative: A comparison of ozone climatologies from international satellite limb sounders

Author

Tegtmeier, Susann, Hegglin, M. I., Anderson, J., Bourassa, A., Brohede, S., Degenstein, D., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Krüger, Kirstin, Kyrölä, E., Lingenfelser, G., Lumpe, J., Nardi, B., Neu, J., Pendlebury, D., Remsberg, E., Rozanov, A., Smith, L., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K. A., and Wang, H. J.

Abstract

A comprehensive quality assessment of the ozone products from 18 limb-viewing satellite instruments is provided by means of a detailed inter-comparison. The ozone climatologies in the form of monthly zonal mean time series covering the upper troposphere to lower mesosphere are obtained from LIMS, SAGE I, SAGE II, UARS-MLS, HALOE, POAM II, POAM III, SMR, OSIRIS, SAGE III, MIPAS, GOMOS, SCIAMACHY, ACE-FTS, ACE-MAESTRO, Aura-MLS, HIRDLS, and SMILES within 1978-2010. The inter-comparisons focus on mean biases based on monthly and annual zonal mean fields, on inter-annual variability and on seasonal cycles. Additionally, the physical consistency of the data sets is tested through diagnostics of the quasi-biennial oscillation and the Antarctic ozone hole. The comprehensive evaluations reveal that the uncertainty in our knowledge of the atmospheric ozone mean state is smallest in the tropical middle stratosphere and in the midlatitude lower/middle stratosphere, where we find a 1σ multi-instrument spread of less than ±5%. While the overall agreement among the climatological data sets is very good for large parts of the stratosphere, individual discrepancies have been identified including unrealistic month-to-month fluctuations, large biases in particular atmospheric regions, or inconsistencies in the seasonal cycle. Notable differences between the data sets exist in the tropical lower stratosphere and at high latitudes, with a multi-instrument spread of ±30% at the tropical tropopause and ±15% at polar latitudes. In particular, large relative differences are identified in the Antarctic polar cap during the time of the ozone hole, with a spread between the monthly zonal mean fields of ±50%. Differences between the climatological data sets are suggested to be partially related to inter-instrumental differences in vertical resolution and geographical sampling. The evaluations as a whole provide guidance on what data sets are the most reliable for applications such as studies of ozone variability, model-measurement comparisons and detection of long-term trends. A detailed comparison versus SAGE II data is presented, which can help identify suitable candidates for long-term data merging studies.

Published
2013

8. Validation of ACE and OSIRIS ozone and NO2 measurements using ground-based instruments at 80° N

Author

Adams, C., Strong, K., Batchelor, R. L., Bernath, P. F., Brohede, S., Boone, C., Degenstein, D., Daffer, W. H., Drummond, J. R., Fogal, P. F., Farahani, E., Fayt, C., Fraser, A., Goutail, Florence, Hendrick, F., Kolonjari, F., Lindenmaier, R., Manney, G., Mcelroy, C. T., Mclinden, C. A., Mendonca, J., Park, J.-H., Pavlovic, B., Pazmino, Andrea, Roth, C., Savastiouk, V., Walker, K. A., Weaver, D., Zhao, X., Department of Physics [Toronto], University of Toronto, NCAR Earth Systems Laboratory (NESL), National Center for Atmospheric Research [Boulder] (NCAR), Department of Chemistry [York, UK], University of York [York, UK], Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Chemistry and Biochemistry [Norfolk], Old Dominion University [Norfolk] (ODU), Department of Earth and Space Sciences [Göteborg], Chalmers University of Technology [Göteborg], University of Saskatchewan [Saskatoon] (U of S), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), School of Geosciences [Edinburgh], University of Edinburgh, 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), New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), Air Quality Research Division [Toronto], Environment and Climate Change Canada, York University [Toronto], Full Spectrum Science Inc. [Toronto], National Aeronautics and Space Administration (NASA), Belgian PRODEX SECPEA and A3C projects, European Commission, European Project: GEOMON, European Project: 284421,EC:FP7:SPA,FP7-SPACE-2011-1,NORS(2011), and California Institute of Technology (CALTECH)-NASA

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], lcsh:TA715-787, lcsh:Earthwork. Foundations, lcsh:TA170-171, lcsh:Environmental engineering
Abstract

The Optical Spectrograph and Infra-Red Imager System (OSIRIS) and the Atmospheric Chemistry Experiment (ACE) have been taking measurements from space since 2001 and 2003, respectively. This paper presents intercomparisons between ozone and NO2 measured by the ACE and OSIRIS satellite instruments and by ground-based instruments at the Polar Environment Atmospheric Research Laboratory (PEARL), which is located at Eureka, Canada (80° N, 86° W) and is operated by the Canadian Network for the Detection of Atmospheric Change (CANDAC). The ground-based instruments included in this study are four zenith-sky differential optical absorption spectroscopy (DOAS) instruments, one Bruker Fourier transform infrared spectrometer (FTIR) and four Brewer spectrophotometers. Ozone total columns measured by the DOAS instruments were retrieved using new Network for the Detection of Atmospheric Composition Change (NDACC) guidelines and agree to within 3.2%. The DOAS ozone columns agree with the Brewer spectrophotometers with mean relative differences that are smaller than 1.5%. This suggests that for these instruments the new NDACC data guidelines were successful in producing a homogenous and accurate ozone dataset at 80° N. Satellite 14-52 km ozone and 17-40 km NO2 partial columns within 500 km of PEARL were calculated for ACE-FTS Version 2.2 (v2.2) plus updates, ACE-FTS v3.0, ACE-MAESTRO (Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) v1.2 and OSIRIS SaskMART v5.0x ozone and Optimal Estimation v3.0 NO2 data products. The new ACE-FTS v3.0 and the validated ACE-FTS v2.2 partial columns are nearly identical, with mean relative differences of 0.0 ± 0.2% for ozone and -0.2 ± 0.1% for v2.2 minus v3.3 NO2. Ozone columns were constructed from 14-52 km satellite and 0-14 km ozonesonde partial columns and compared with the ground-based total column measurements. The satellite-plus-sonde measurements agree with the ground-based ozone total columns with mean relative differences of 0.1-7.3%. For NO2, partial columns from 17 km upward were scaled to noon using a photochemical model. Mean relative differences between OSIRIS, ACE-FTS and ground-based NO2 measurements do not exceed 20%. ACE-MAESTRO measures more NO2 than the other instruments, with mean relative differences of 25-52%. Seasonal variation in the differences between partial columns is observed, suggesting that there are systematic errors in the measurements, the photochemical model corrections, and/or in the coincidence criteria. For ozone spring-time measurements, additional coincidence criteria based on stratospheric temperature and the location of the polar vortex were found to improve agreement between some of the instruments. For ACE-FTS v2.2 minus Bruker FTIR, the 2007-2009 spring-time mean relative difference improved from -5.0 ± 0.4% to -3.1 ± 0.8% with the dynamical selection criteria. This was the largest improvement, likely because both instruments measure direct sunlight and therefore have well-characterized lines-of-sight compared with scattered sunlight measurements. For NO2, the addition of a ±1° latitude coincidence criterion improved spring-time intercomparison results, likely due to the sharp latitudinal gradient of NO2 during polar sunrise. The differences between satellite and ground-based measurements do not show any obvious trends over the missions, indicating that both the ACE and OSIRIS instruments continue to perform well.

Published
2012
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9. A new method to detect long term trends of methane (CH₄) and nitrous oxide (N₂O) total columns measured within the NDACC ground-based high resolution solar FTIR network

Author

Angelbratt, J., Mellqvist, J., Blumenstock, T., Borsdorff, T., Brohede, S., Duchatelet, P., Forster, F., Hase, F., Mahieu, E., Murtagh, D., Petersen, A. K., Schneider, M., Sussmann, R., and Urban, J.

Subjects
ddc:620, Engineering & allied operations
Abstract

Total columns measured with the ground-based solar FTIR technique are highly variable in time due to atmospheric chemistry and dynamics in the atmosphere above the measurement station. In this paper, a multiple regression model with anomalies of air pressure, total columns of hydrogen fluoride (HF) and carbon monoxide (CO) and tropopause height are used to reduce the variability in the methane (CH4) and nitrous oxide (N2O) total columns to estimate reliable linear trends with as small uncertainties as possible. The method is developed at the Harestua station (60°N, 11°E, 600ma.s.l.) and used on three other European FTIR stations, i.e. Jungfraujoch (47°N, 8°E, 3600ma.s.l.), Zugspitze (47°N, 11°E, 3000ma.s.l.), and Kiruna (68°N, 20°E, 400ma.s.l.). Linear CH4 trends between 0.13±0.01-0.25±0.02%yr−1 were estimated for all stations in the 1996-2009 period. A piecewise model with three separate linear trends, connected at change points, was used to estimate the short term fluctuations in the CH4 total columns. This model shows a growth in 1996–1999 followed by a period of steady state until 2007. From 2007 until 2009 the atmospheric CH4 amount increases between 0.57±0.22–1.15±0.17%yr−1. Linear N2O trends between 0.19±0.01–0.40±0.02%yr−1 were estimated for all stations in the 1996-2007 period, here with the strongest trend at Harestua and Kiruna and the lowest at the Alp stations. From the N2O total columns crude tropospheric and stratospheric partial columns were derived, indicating that the observed difference in the N2O trends between the FTIR sites is of stratospheric origin. This agrees well with the N2O measurements by the SMR instrument onboard the Odin satellite showing the highest trends at Harestua, 0.98±0.28%yr−1, and considerably smaller trends at lower latitudes, 0.27±0.25%yr−1. The multiple regression model was compared with two other trend methods, the ordinary linear regression and a Bootstrap algorithm. The multiple regression model estimated CH4 and N2O trends that differed up to 31% compared to the other two methods and had uncertainties that were up to 300% lower. Since the multiple regression method were carefully validated this stresses the importance to account for variability in the total columns when estimating trend from solar FTIR data.

Published
2011
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10. Odin stratospheric proxy NOy measurements and climatology

Author

Brohede, S., Mclinden, C. A., Urban, Jakub, Haley, C. S., Jonsson, A. I., Murtagh, D., Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Environment and Climate Change Canada, Centre for Research in Earth and Space Science [Toronto] (CRESS), York University [Toronto], Department of Physics [Toronto], University of Toronto, and EGU, Publication

Subjects
lcsh:Chemistry, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, lcsh:QD1-999, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, lcsh:Physics, lcsh:QC1-999
Abstract

International audience; Five years of OSIRIS (Optical Spectrograph and InfraRed Imager System) NO2 and SMR (Sub-Millimetre Radiometer) HNO3 observations from the Odin satellite, combined with data from a photochemical box model, have been used to construct a stratospheric proxy NOy data set including the gases: NO, NO2, HNO3, 2×N2O5 and CIONO2. This Odin NOy climatology is based on all daytime measurements and contains monthly mean and standard deviation, expressed as mixing ratio or number density, as function of latitude or equivalent latitude (5° bins) on 17 vertical layers (altitude, pressure or potential temperature) between 14 and 46 km. Comparisons with coincident NOy profiles from the Atmospheric Chemistry Experiment?Fourier Transform Spectrometer (ACE-FTS) instrument were used to evaluate several methods to combine Odin observations with model data. This comparison indicates that the most appropriate merging technique uses OSIRIS measurements of NO2, scaled with model NO/NO2 ratios, to estimate NO. The sum of 2×N2O5 and CIONO2 is estimated from uncertainty-based weighted averages of scaled observations of SMR HNO3 and OSIRIS NO2. Comparisons with ACE-FTS suggest the precision (random error) and accuracy (systematic error) of Odin NOy profiles are about 15% and 20%, respectively. Further comparisons between Odin and the Canadian Middle Atmosphere Model (CMAM) show agreement to within 20% and 2 ppb throughout most of the stratosphere except in the polar vortices. A particularly large disagreement within the Antarctic vortex in the upper stratosphere during spring indicates too strong descent of air in CMAM. The combination of good temporal and spatial coverage, a relatively long data record, and good accuracy and precision make this a valuable NOy product for various atmospheric studies and model assessments.

Published
2008

11. Validation of NO2 and NO from the Atmospheric Chemistry Experiment (ACE)

Author

Kerzenmacher, T., Wolff, M. A., Strong, K., Dupuy, E., Walker, K. A., Amekudzi, L. K., Batchelor, R. L., Bernath, P. F., Berthet, Gwenaël, Blumenstock, T., Boone, C. D., Bramstedt, K., Brogniez, C., Brohede, S., Burrows, J. P., Catoire, Valéry, Dodion, J., Drummond, J. R., Dufour, D. G., Funke, B., Fussen, D., Goutail, Florence, Griffith, D. W. T., Haley, C. S., Hendrick, F., Höpfner, M., Huret, Nathalie, Jones, N., Kar, J., Kramer, I., Llewellyn, E. J., López-Puertas, M., Manney, G., Mcelroy, C. T., Mclinden, C. A., Melo, S., Mikuteit, S., Murtagh, D., Nichitiu, F., Notholt, J., Nowlan, C., Piccolo, C., Pommereau, Jean-Pierre, Randall, C., Raspollini, P., Ridolfi, M., Richter, A., Schneider, M., Schrems, O., Silicani, M., Stiller, G. P., Taylor, James, Tétard, C., Toohey, M., Vanhellemont, F., Warneke, T., Zawodny, J. M., Zou, J., Department of Physics [Toronto], University of Toronto, Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Institut für Umweltphysik [Bremen] (IUP), Universität Bremen, Department of Chemistry [York, UK], University of York [York, UK], Laboratoire de physique et chimie de l'environnement (LPCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), 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 Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], Picomole Instruments Inc., Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Service d'aéronomie (SA), 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), School of Chemistry [Wollongong], University of Wollongong [Australia], Centre for Research in Earth and Space Science [Toronto] (CRESS), York University [Toronto], Institute of Space and Atmospheric Studies [Saskatoon] (ISAS), Department of Physics and Engineering Physics [Saskatoon], University of Saskatchewan [Saskatoon] (U of S)-University of Saskatchewan [Saskatoon] (U of S), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), Environment and Climate Change Canada, Canadian Space Agency (CSA), Department of Atmospheric, Oceanic and Planetary Physics [Oxford] (AOPP), University of Oxford, Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], Department of Atmospheric and Oceanic Sciences [Boulder] (ATOC), Istituto di Fisica Applicata 'Nello Carrara' (IFAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Dipartimento di Chimica Fisica e Inorganica [Bologna], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), NASA Langley Research Center [Hampton] (LaRC), Institut für Umweltphysik [Bremen] ( IUP ), Laboratoire de physique et chimie de l'environnement ( LPCE ), Institut national des sciences de l'Univers ( INSU - CNRS ) -Université d'Orléans ( UO ) -Centre National de la Recherche Scientifique ( CNRS ), Institut für Meteorologie und Klimaforschung ( IMK ), Karlsruher Institut für Technologie ( KIT ), 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 ), Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique ( BIRA-IASB ), Instituto de Astrofísica de Andalucía ( IAA ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ), Service d'aéronomie ( SA ), 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 ), University of Wollongong, Centre for Research in Earth and Space Science [Toronto] ( CRESS ), Institute of Space and Atmospheric Studies [Saskatoon] ( ISAS ), University of Saskatchewan [Saskatoon] ( U of S ), Jet Propulsion Laboratory ( JPL ), NASA-California Institute of Technology ( CALTECH ), New Mexico Institute of Mining and Technology [New Mexico Tech] ( NMT ), Canadian Space Agency ( CSA ), Department of Atmospheric, Oceanic and Planetary Physics [Oxford] ( AOPP ), University of Oxford [Oxford], Laboratory for Atmospheric and Space Physics [Boulder] ( LASP ), University of Colorado Boulder [Boulder], Department of Atmospheric and Oceanic Sciences [Boulder] ( ATOC ), Istituto di Fisica Applicata 'Nello Carrara' ( IFAC ), Consiglio Nazionale delle Ricerche [Roma] ( CNR ), Università di Bologna [Bologna] ( UNIBO ), Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research ( AWI ), NASA Langley Research Center [Hampton] ( LaRC ), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille, Consejo Superior de Investigaciones Científicas [Spain] (CSIC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), California Institute of Technology (CALTECH)-NASA, Consiglio Nazionale delle Ricerche [Roma] (CNR), and Università di Bologna [Bologna] (UNIBO)

Subjects
lcsh:Chemistry, [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, lcsh:QD1-999, lcsh:Physics, lcsh:QC1-999
Abstract

Vertical profiles of NO2 and NO have been obtained from solar occultation measurements by the Atmospheric Chemistry Experiment (ACE), using an infrared Fourier Transform Spectrometer (ACE-FTS) and (for NO2) an ultraviolet-visible-near-infrared spectrometer, MAESTRO (Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation). In this paper, the quality of the ACE-FTS version 2.2 NO2 and NO and the MAESTRO version 1.2 NO2 data are assessed using other solar occultation measurements (HALOE, SAGE II, SAGE III, POAM III, SCIAMACHY), stellar occultation measurements (GOMOS), limb measurements (MIPAS, OSIRIS), nadir measurements (SCIAMACHY), balloon-borne measurements (SPIRALE, SAOZ) and ground-based measurements (UV-VIS, FTIR). Time differences between the comparison measurements were reduced using either a tight coincidence criterion, or where possible, chemical box models. ACE-FTS NO2 and NO and the MAESTRO NO2 are generally consistent with the correlative data. The ACE-FTS and MAESTRO NO2 volume mixing ratio (VMR) profiles agree with the profiles from other satellite data sets to within about 20% between 25 and 40 km, with the exception of MIPAS ESA (for ACE-FTS) and SAGE II (for ACE-FTS (sunrise) and MAESTRO) and suggest a negative bias between 23 and 40 km of about 10%. MAESTRO reports larger VMR values than the ACE-FTS. In comparisons with HALOE, ACE-FTS NO VMRs typically (on average) agree to ±8% from 22 to 64 km and to +10% from 93 to 105 km, with maxima of 21% and 36%, respectively. Partial column comparisons for NO2 show that there is quite good agreement between the ACE instruments and the FTIRs, with a mean difference of +7.3% for ACE-FTS and +12.8% for MAESTRO.

Published
2008

12. Validation of HNO3, ClONO2, and N2O5 from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)

Author

Wolff, M. A., Kerzenmacher, T., Strong, K., Walker, K. A., Toohey, M., Dupuy, E., Bernath, P. F., Boone, C. D., Brohede, S., Catoire, Valéry, Von Clarmann, T., Coffey, M., Daffer, W. H., De Mazière, M., Duchatelet, P., Glatthor, N., Griffith, D. W. T., Hannigan, J., Hase, F., Höpfner, M., Huret, Nathalie, Jones, N., Jucks, K., Kagawa, A., Kasai, Y., Kramer, I., Küllmann, H., Kuttippurath, J., Mahieu, E., Manney, G., Mclinden, C., Mébarki, Y., Mikuteit, S., Murtagh, D., Piccolo, C., Raspollini, P., Ridolfi, M., Ruhnke, R., Santee, M., Senten, C., Smale, D., Tétard, C., Urban, Jakub, Wood, S., Department of Physics [Toronto], University of Toronto, Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Chemistry, Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Laboratoire de physique et chimie de l'environnement ( LPCE ), Institut national des sciences de l'Univers ( INSU - CNRS ) -Université d'Orléans ( UO ) -Centre National de la Recherche Scientifique ( CNRS ), Forschungzentrum Karlsruhe and University of Karlsruhe, National Center for Atmospheric Research [Boulder] ( NCAR ), Columbus Technologies Inc., Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique ( BIRA-IASB ), Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, School of Chemistry, Harvard-Smithsonian Center for Astrophysics ( CfA ), Harvard University [Cambridge]-Smithsonian Institution, Fujitsu FIP Corporation, Environmental Sensing and Network Group, Institute of Environmental Physics [Bremen] ( IUP ), University of Bremen, Jet Propulsion Laboratory ( JPL ), NASA-California Institute of Technology ( CALTECH ), New Mexico Institute of Mining and Technology [New Mexico Tech] ( NMT ), Environment and Climate Change Canada, Department of Atmospheric, Oceanic and Planetary Physics [Oxford] ( AOPP ), University of Oxford [Oxford], Institute of Applied Physics ``Nello Carrara', Dipartimento di Chimica Fisica e Inorganica, National Institute of Water and Atmospheric Research Ltd., 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 ), Laboratoire de physique et chimie de l'environnement (LPCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), National Center for Atmospheric Research [Boulder] (NCAR), Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University-Smithsonian Institution, Institute of Environmental Physics [Bremen] (IUP), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), Department of Atmospheric, Oceanic and Planetary Physics [Oxford] (AOPP), University of Oxford, Institute of Applied Physics 'Nello Carrara' (IFAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Dipartimento di Chimica Fisica e Inorganica [Bologna], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), National Institute of Water and Atmospheric Research [Lauder] (NIWA), 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), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Smithsonian Institution-Harvard University [Cambridge], California Institute of Technology (CALTECH)-NASA, Consiglio Nazionale delle Ricerche (CNR), and Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille

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

International audience; The Atmospheric Chemistry Experiment (ACE) satellite was launched on 12 August 2003. Its two instruments measure vertical profiles of over 30 atmospheric trace gases by analyzing solar occultation spectra in the ultraviolet/visible and infrared wavelength regions. The reservoir gases HNO3, ClONO2, and N2O5 are three of the key species provided by the primary instrument, the ACE Fourier Transform Spectrometer (ACE-FTS). This paper describes the ACE-FTS version 2.2 data products, including the N2O5 update, for the three species and presents validation comparisons with available observations. We have compared volume mixing ratio (VMR) profiles of HNO3, ClONO2, and N2O5 with measurements by other satellite instruments (SMR, MLS, MIPAS), aircraft measurements (ASUR), and single balloon-flights (SPIRALE, FIRS-2). Partial columns of HNO3 and ClONO2 were also compared with measurements by ground-based Fourier Transform Infrared (FTIR) spectrometers. Overall the quality of the ACE-FTS v2.2 HNO3 VMR profiles is good from 18 to 35 km. For the statistical satellite comparisons, the mean absolute differences are generally within ±1 ppbv (±20%) from 18 to 35 km. For MIPAS and MLS comparisons only, mean relative differences lie within ±10% between 10 and 36 km. ACE-FTS HNO3 partial columns (~15–30 km) show a slight negative bias of -1.3% relative to the ground-based FTIRs at latitudes ranging from 77.8° S–76.5° N. Good agreement between ACE-FTS ClONO2 and MIPAS, using the Institut für Meteorologie und Klimaforschung and Instituto de Astrofisica de Andalucia (IMK-IAA) data processor is seen. Mean absolute differences are typically within ±0.01 ppbv between 16 and 27 km and less than +0.09 ppbv between 27 and 34 km. The ClONO2 partial column comparisons show varying degrees of agreement, depending on the location and the quality of the FTIR measurements. Good agreement was found for the comparisons with the midlatitude Jungfraujoch partial columns for which the mean relative difference is 4.7%. ACE-FTS N2O5 has a low bias relative to MIPAS IMK-IAA, reaching -0.25 ppbv at the altitude of the N2O5 maximum (around 30 km). Mean absolute differences at lower altitudes (16–27 km) are typically -0.05 ppbv for MIPAS nighttime and ±0.02 ppbv for MIPAS daytime measurements.

Published
2008

13. Validation of HNO₃, ClONO₂, and N₂O₅ from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)

Author

Wolff, M.A., Kerzenmacher, T., Strong, K., Walker, K.A., Toohey, M., Dupuy, E., Bernath, P.F., Boone, C.D., Brohede, S., Catoire, N., Clarmann, T.Von, Coffey, M., Daffer, W.H., De Maziere, M., Duchatelet, P., Glatthor, N., Griffith, D.W.T., Hannigan, J., Hase, F., Höpfner, M., Huret, N., Jones, N., Jucks, K., Kagawa, A., Kasai, Y., Kramer, I., Küllmann, H., Kuttippurath, J., Mahieu, E., Manney, G., McElroy, C.T., McLinden, C., Mebarki, Y., Mikuteit, S., Murtagh, D., Piccolo, C., Raspollini, P., Ridolfi, M., Ruhnke, R., Santee, M., Senten, C., Smale, D., Tetard, C., Urban, J., and Wood, S.

Subjects
Earth sciences, ddc:550
Published
2008

14. Vertical profiles of lightning-produced NO2 enhancements in the upper troposphere observed by OSIRIS

Author

Sioris, C. E., Mclinden, C. A., Martin, R. V., Sauvage, B., Haley, C. S., Lloyd, N. D., Llewellyn, E. J., Bernath, P. F., Boone, C. D., Brohede, S., Mcelroy, C. T., EGU, Publication, Atomic and Molecular Physics Division [Cambridge] (AMP), Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University [Cambridge]-Smithsonian Institution-Harvard University [Cambridge]-Smithsonian Institution, Institute of Space and Atmospheric Studies [Saskatoon] (ISAS), Department of Physics and Engineering Physics [Saskatoon], University of Saskatchewan [Saskatoon] (U of S)-University of Saskatchewan [Saskatoon] (U of S), Experimental Studies Section, Environment and Climate Change Canada, Department of Physics and Atmospheric Science [Halifax], Dalhousie University [Halifax], Department of Chemistry [York, UK], University of York [York, UK], Department of Chemistry [Waterloo], University of Waterloo [Waterloo], Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Experimental Studies Sect., Centre for Research in Earth and Space Science [Toronto] (CRESS), and York University [Toronto]

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

International audience; The purpose of this study is to perform a global search of the upper troposphere (z?10 km) for enhancements of nitrogen dioxide and determine their sources. This is the first application of satellite-based limb scattering to study upper tropospheric NO2. We have searched two years (May 2003?May 2005) of OSIRIS (Optical Spectrograph and Infrared Imager System) operational NO2 concentrations (version 2.3/2.4) to find large enhancements in the observations by comparing with photochemical box model calculations and by identifying local maxima in NO2 volume mixing ratio. We find that lightning is the main production mechanism responsible for the large enhancements in OSIRIS NO2 observations as expected. Similar patterns in the abundances and spatial distribution of the NO2 enhancements are obtained by perturbing the lightning within the GEOS-Chem 3-dimensional chemical transport model. In most cases, the presence of lightning is confirmed with coincident imagery from LIS (Lightning Imaging Sensor) and the spatial extent of the NO2 enhancement is mapped using nadir observations of tropospheric NO2 at high spatial resolution from SCIAMACHY (Scanning Imaging Absorption Spectrometer for Atmospheric Chartography) and OMI (Ozone Monitoring Instrument). The combination of the lightning and chemical sensors allows us to investigate globally the role of lightning to the abundance of NO2 in the upper troposphere (UT). Lightning contributes 60% of the tropical upper tropospheric NO2 in GEOS-Chem simulations. The spatial and temporal distribution of NO2 enhancements from lightning (May 2003?May 2005) is investigated. The enhancements generally occur at 12 to 13 km more frequently than at 10 to 11 km. This is consistent with the notion that most of the NO2 is forming and persisting near the cloud top altitude in the tropical upper troposphere. The latitudinal distribution is mostly as expected. In general, the thunderstorms exhibiting weaker vertical development (e.g. 11?z?13 km) extend latitudinally as far poleward as 45° but the thunderstorms with stronger vertical development (z?14 km) tend to be located within 33° of the equator. There is also the expected hemispheric asymmetry in the frequency of the NO2 enhancements, as most were observed in the northern hemisphere for the period analyzed.

Published
2007

15. Comparison of ozone profiles measured by the Odin satellite instruments and ground-based, airborne, satellite experiments and model computations

Author

Jégou, F., Noë, J. de la, Drouin, A., Ricaud, P., Urban, Joanna, Schneider, N., Leflochmoën, E., Dupuy, E., Amraoui, L. El, Planchais, Y., Murtagh, D. P., Lautie, N., Eriksson, P., Jiménez, C., Brohede, S., Stegman, J., Llewellyn, E. J., Petelina, S., Degenstein, D.A., Gattinger, R. L., Lloyd, N. D., Haley, C. S., Savigny, C. von, Mcdade, I., Goutail, Florence, Bazureau, Ariane, Godin-Beekmann, Sophie, Pommereau, Jean-Pierre, Camy-Peyret, Claude, Payan, Sébastien, Gesek, P., Moreau, G., Renard, Jean-Baptiste, Robert, Cédric, Catoire, Valéry, Huret, Nathalie, Strong, K., Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'aérologie (LAERO), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Department of Radio and Space Science [Göteborg], Chalmers University of Technology [Göteborg], Department of Meteorology [Stockholm] (MISU), Stockholm University, Institute of Space and Atmospheric Studies [Saskatoon] (ISAS), Department of Physics and Engineering Physics [Saskatoon], University of Saskatchewan [Saskatoon] (U of S)-University of Saskatchewan [Saskatoon] (U of S), University of Saskatchewan [Saskatoon] (U of S), Centre for Research in Earth and Space Science [Toronto] (CRESS), York University [Toronto], Department of Earth and Space Science and Engineering [York University - Toronto] (ESSE), Service d'aéronomie (SA), 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 de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique et chimie de l'environnement (LPCE), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Gustave Roussy (IGR), Department of Physics [Toronto], University of Toronto, Laboratoire d'aérologie (LA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-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)-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 Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)

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

The Odin satellite carries two instruments measuring ozone spectra from which strato- spheric ozone profiles are retrieved. Onboard Odin, the Sub-Millimeter Radiometer (SMR) measures an ozone spectral line at 501.4 GHz. Forward model and inversion codes using the Optimal Estimation Method permit the retrieval of vertical profiles in the altitude range 20-65 km. The UV-visible spectrograph of the OSIRIS instru- ment measures ozone absorption limb spectra in the ranges 300-340 and 400-700 nm. A code based on the technique described by Flittner et al. (2000) and McPeters et al. (2000) provides vertical profiles from 20 to 60 km. This work presents a comparison of Odin ozone profiles with those obtained by ground-based measurements from primary or complementary stations of the Network for the Detection of Stratospheric Change (NDSC) such as lidars, microwave radiometers and ozonesondes. Some additional comparisons are also performed with ozone profiles obtained by balloon flights, air- craft experiments, other satellite measurements and model computations. These largesets of comparisons is also used to confirm the soundness of the Odin ozone measure- ments.

Published
2004

16. Characterizing sampling biases in the trace gas climatologies of the SPARC Data Initiative

Author

Toohey, Matthew, Hegglin, M. I., Tegtmeier, Susann, Anderson, J., Añel, J. A., Bourassa, A., Brohede, S., Degenstein, D., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Krüger, Kirstin, Kyrölä, E., Neu, J. L., Rozanov, A., Smith, L., Urban, J., von Clarmann, T., Walker, K. A., Wang, R., Toohey, Matthew, Hegglin, M. I., Tegtmeier, Susann, Anderson, J., Añel, J. A., Bourassa, A., Brohede, S., Degenstein, D., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Krüger, Kirstin, Kyrölä, E., Neu, J. L., Rozanov, A., Smith, L., Urban, J., von Clarmann, T., Walker, K. A., and Wang, R.

Abstract

Monthly zonal mean climatologies of atmospheric measurements from satellite instruments can have biases due to the non-uniform sampling of the atmosphere by the instruments. We characterize potential sampling biases in stratospheric trace gas climatologies of the Stratospheric Processes and their Role in Climate (SPARC) Data Initiative using chemical fields from a chemistry climate model simulation and sampling patterns from 16 satellite-borne instruments. The exercise is performed for the long-lived stratospheric trace gases O3 and H2O. Monthly sample biases for O3 exceed 10% for many instruments in the high latitude stratosphere and in the upper troposphere/lower stratosphere, while annual mean sampling biases reach values of up to 20% in the same regions for some instruments. Sampling biases for H2O are generally smaller than for O3, although still notable in the upper troposphere/lower stratosphere and Southern Hemisphere high latitudes. The most important mechanism leading to monthly sampling bias is the non-uniform temporal sampling of many instruments, i.e., the fact that for many instruments, monthly means are produced from measurements which span less than the full month in question. Similarly, annual mean sampling biases are well explained by non-uniformity in the month-to-month sampling by different instruments. Non-uniform sampling in latitude and longitude are shown to also lead to non-negligible sampling biases, which are most relevant for climatologies which are otherwise free of sampling biases due to non-uniform temporal sampling.

Published
2013
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17. Characterizing sampling-related uncertainties in stratospheric trace gas climatologies

Author

Toohey, Matthew, von Clarmann, T., Hegglin, M. I., Tegtmeier, Susann, Brohede, S., Degenstein, D., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Rozanov, A., Urban, J., Walker, K., Toohey, Matthew, von Clarmann, T., Hegglin, M. I., Tegtmeier, Susann, Brohede, S., Degenstein, D., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Rozanov, A., Urban, J., and Walker, K.

Published
2013

18. Satellite Measurements of the Upper Troposphere / Lower Stratosphere (UTLS) Region: Intercomparison and Future Prospects

Author

Neu, J., Livesey, N., Santee, M., Manney, G., Hegglin, I., Tegtmeier, Susann, Brohede, S., Degenstein, D., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jonas, A., Rozanov, A., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K., Neu, J., Livesey, N., Santee, M., Manney, G., Hegglin, I., Tegtmeier, Susann, Brohede, S., Degenstein, D., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jonas, A., Rozanov, A., Toohey, Matthew, Urban, J., von Clarmann, T., and Walker, K.

Published
2013

19. The SPARC Data Initiative – Climatology comparisons for water vapour, methane, CO, CFC-11, CFC-12, SF6, HO2, OH, and CH2O

Author

Hegglin, M. I., Tegtmeier, Susann, Anderson, J., Brohede, S., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Kyröla, E., Lingenfelser, G., McLinden, C., Neu, J., Remsberg, E., Rozanov, A., Smith, L., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K. A., Wang, R., Hegglin, M. I., Tegtmeier, Susann, Anderson, J., Brohede, S., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Kyröla, E., Lingenfelser, G., McLinden, C., Neu, J., Remsberg, E., Rozanov, A., Smith, L., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K. A., and Wang, R.

Published
2011

20. The SPARC Data Initiative Overview

Author

Hegglin, M. I., Tegtmeier, Susann, Anderson, J., Brohede, S., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Kyröla, E., Lingenfelser, G., McLinden, C., Neu, J., Remsberg, E., Rozanov, A., Smith, L., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K. A., Wang, R., Hegglin, M. I., Tegtmeier, Susann, Anderson, J., Brohede, S., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Kyröla, E., Lingenfelser, G., McLinden, C., Neu, J., Remsberg, E., Rozanov, A., Smith, L., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K. A., and Wang, R.

Published
2011

21. SPARC Data Initiative – Climatology comparisons for O3, N2O, NOy, NOx, ClO, and BrO

Author

Tegtmeier, Susann, Hegglin, M. I., Anderson, J., Brohede, S., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Kyröla, E., Lingenfelser, G., McLinden, C., Neu, J., Remsberg, E., Rozanov, A., Smith, L., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K. A., Wang, R., Tegtmeier, Susann, Hegglin, M. I., Anderson, J., Brohede, S., Froidevaux, L., Fuller, R., Funke, B., Gille, J., Jones, A., Kasai, Y., Kyröla, E., Lingenfelser, G., McLinden, C., Neu, J., Remsberg, E., Rozanov, A., Smith, L., Toohey, Matthew, Urban, J., von Clarmann, T., Walker, K. A., and Wang, R.

Published
2011

22. Validation of NO2 and NO from the Atmospheric Chemistry Experiment (ACE)

Author

Jones, Nicholas B, Griffith, David W, Wolff, M, Llewellyn, L, Blumenstock, T, McElroy, Christopher, Hopfner, M, Kerzenmacher, T, Kramer, I, Strong, K, Haley, Cassandra, Taylor, J R, Warneke, Thorsten, Murtagh, D, Dupuy, E, Catoire, V, Huret, N, Brogniez, C, Manney, G L, Piccolo, C, Randall, C, Tetard, C, Lopez-Puertas, M, Drummond, James, Boone, C, Funke, B, Schneider, M, Mikuteit, S, Stiller, G P, Walker, K A, Bernath, P, Schrems, O, Raspollini, P, McLinden, C, Brohede, S, Toohey, M, Ridolfi, M, Dodion, J, Vanhellemont, F, Batchelor, R L, Burrows, J P, kar, J, Amekudzi, L K, Melo, S, Goutail, F, Bramstedt, C, Dufour, D G, Silicani, M, Zawodny, J M, Richter, A, Berthet, G, Nichitiu, F, Pommereau, J-P, Nowlan, C, Fussen, D, Zou, J, Pakula, Irwin S, Notholt, Justus, Jones, Nicholas B, Griffith, David W, Wolff, M, Llewellyn, L, Blumenstock, T, McElroy, Christopher, Hopfner, M, Kerzenmacher, T, Kramer, I, Strong, K, Haley, Cassandra, Taylor, J R, Warneke, Thorsten, Murtagh, D, Dupuy, E, Catoire, V, Huret, N, Brogniez, C, Manney, G L, Piccolo, C, Randall, C, Tetard, C, Lopez-Puertas, M, Drummond, James, Boone, C, Funke, B, Schneider, M, Mikuteit, S, Stiller, G P, Walker, K A, Bernath, P, Schrems, O, Raspollini, P, McLinden, C, Brohede, S, Toohey, M, Ridolfi, M, Dodion, J, Vanhellemont, F, Batchelor, R L, Burrows, J P, kar, J, Amekudzi, L K, Melo, S, Goutail, F, Bramstedt, C, Dufour, D G, Silicani, M, Zawodny, J M, Richter, A, Berthet, G, Nichitiu, F, Pommereau, J-P, Nowlan, C, Fussen, D, Zou, J, Pakula, Irwin S, and Notholt, Justus

Abstract

Vertical profiles of NO2 and NO have been obtained from solar occultation measurements by the Atmospheric Chemistry Experiment (ACE), using an infrared Fourier Transform Spectrometer (ACE-FTS) and (for NO2) an ultraviolet-visible-near-infrared spectrometer, MAESTRO (Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation). In this paper, the quality of the ACE-FTS version 2.2 NO2 and NO and the MAESTRO version 1.2 NO2 data are assessed using other solar occultation measurements (HALOE, SAGE II, SAGEIII, POAMIII, SCIAMACHY), stellar occultation measurements (GOMOS), limb measurements (MIPAS, OSIRIS), nadir measurements (SCIAMACHY), balloon-borne measurements (SPIRALE, SAOZ) and ground-based measurements (UV-VIS, FTIR). Time differences between the comparison measurements were reduced using either a tight coincidence criterion, or where possible, chemical box models. ACE-FTS NO2 and NO and the MAESTRO NO2 are generally consistent with the correlative data. The ACE-FTS and MAESTRO NO2 volume mixing ratio (VMR) profiles agree with the profiles from other satellite data sets to within about 20% between 25 and 40 km, with the exception of MIPAS ESA (for ACE-FTS) and SAGEII (for ACE-FTS (sunrise) and MAESTRO) and suggest a negative bias between 23 and 40 km of about 10%. MAESTRO reports larger VMR values than the ACE-FTS. In comparisons with HALOE, ACE-FTS NO VMRs typically (on average) agree to ±8% from 22 to 64 km and to +10% from 93 to 105 km, with maxima of 21% and 36%, respectively. Partial column comparisons for NO2 show that there is quite good agreement between the ACE instruments and the FTIRs, with a mean difference of +7.3% for ACEFTS and +12.8% for MAESTRO.

Published
2008

23. Validation of HNO3, C1ONO2, and N2O5 from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)

Author

Wolff, M A, Kerzenmacher, T, Strong, K, Walker, K A, Toohey, M, Dupuy, E, Bernath, P F, Boone, C, Brohede, S, Catoire, V, von Clarmann, T, Coffey, M, Daffer, W, De Maziere, M, Duchatelet, P, Glatthor, N, Griffith, David W, Hannigan, J, Hase, F, Hopfner, M, Huret, N, Jones, Nicholas B, Jucks, K W, Kagawa, A., Kasai, Y, Kramer, I, Kullmann, H, Kuttippurath, J, Mahieu, E, Manney, G L, McElroy, Christopher, McLinden, C, Mebarki, Y, Mikuteit, S, Murtagh, D, Piccolo, C, Raspollini, P, Ridolfi, M, Ruhnke, R, Santee, M, Senten, C, Smale, D, Tetard, C, Urban, J, Wood, S, Wolff, M A, Kerzenmacher, T, Strong, K, Walker, K A, Toohey, M, Dupuy, E, Bernath, P F, Boone, C, Brohede, S, Catoire, V, von Clarmann, T, Coffey, M, Daffer, W, De Maziere, M, Duchatelet, P, Glatthor, N, Griffith, David W, Hannigan, J, Hase, F, Hopfner, M, Huret, N, Jones, Nicholas B, Jucks, K W, Kagawa, A., Kasai, Y, Kramer, I, Kullmann, H, Kuttippurath, J, Mahieu, E, Manney, G L, McElroy, Christopher, McLinden, C, Mebarki, Y, Mikuteit, S, Murtagh, D, Piccolo, C, Raspollini, P, Ridolfi, M, Ruhnke, R, Santee, M, Senten, C, Smale, D, Tetard, C, Urban, J, and Wood, S

Abstract

The Atmospheric Chemistry Experiment (ACE) satellite was launched on 12 August 2003. Its two instruments measure vertical profiles of over 30 atmospheric trace gases by analyzing solar occultation spectra in the ultraviolet/visible and infrared wavelength regions. The reservoir gases HNO3, ClONO2, and N2O5 are three of the key species provided by the primary instrument, the ACE Fourier Transform Spectrometer (ACE-FTS). This paper describes the ACE-FTS version 2.2 data products, including the N2O5 update, for the three species and presents validation comparisons with available observations. We have compared volume mixing ratio (VMR) profiles of HNO3, ClONO2, and N2O5 with measurements by other satellite instruments (SMR, MLS, MIPAS), aircraft measurements (ASUR), and single balloon-flights (SPIRALE, FIRS-2). Partial columns of HNO3 and ClONO2 were also compared with measurements by ground-based Fourier Transform Infrared (FTIR) spectrometers. Overall the quality of the ACE-FTS v2.2 HNO3 VMR profiles is good from 18 to 35 km. For the statistical satellite comparisons, the mean absolute differences are generally within ±1 ppbv ±20%) from 18 to 35 km. For MIPAS and MLS comparisons only, mean relative differences lie within±10% between 10 and 36 km. ACE-FTS HNO3 partial columns (~15–30 km) show a slight negative bias of −1.3% relative to the ground-based FTIRs at latitudes ranging from 77.8° S–76.5° N. Good agreement between ACE-FTS ClONO2 and MIPAS, using the Institut für Meteorologie und Klimaforschung and Instituto de Astrofísica de Andalucía (IMK-IAA) data processor is seen. Mean absolute differences are typically within ±0.01 ppbv between 16 and 27 km and less than +0.09 ppbv between 27 and 34 km. The ClONO2 partial column comparisons show varying degrees of agreement, depending on the location and the quality of the FTIR measurements. Good agreement was found for the comparisons with the midlatitude Jungfraujoch partial columns for which the mean relative differenc

Published
2008

24. SPARC Data Initiative: A comparison of ozone climatologies from international satellite limb sounders

Author

Tegtmeier, S., primary, Hegglin, M. I., additional, Anderson, J., additional, Bourassa, A., additional, Brohede, S., additional, Degenstein, D., additional, Froidevaux, L., additional, Fuller, R., additional, Funke, B., additional, Gille, J., additional, Jones, A., additional, Kasai, Y., additional, Krüger, K., additional, Kyrölä, E., additional, Lingenfelser, G., additional, Lumpe, J., additional, Nardi, B., additional, Neu, J., additional, Pendlebury, D., additional, Remsberg, E., additional, Rozanov, A., additional, Smith, L., additional, Toohey, M., additional, Urban, J., additional, von Clarmann, T., additional, Walker, K. A., additional, and Wang, R. H. J., additional

Published
2013
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25. Characterizing sampling biases in the trace gas climatologies of the SPARC Data Initiative

Author

Toohey, M., primary, Hegglin, M. I., additional, Tegtmeier, S., additional, Anderson, J., additional, Añel, J. A., additional, Bourassa, A., additional, Brohede, S., additional, Degenstein, D., additional, Froidevaux, L., additional, Fuller, R., additional, Funke, B., additional, Gille, J., additional, Jones, A., additional, Kasai, Y., additional, Krüger, K., additional, Kyrölä, E., additional, Neu, J. L., additional, Rozanov, A., additional, Smith, L., additional, Urban, J., additional, Clarmann, T., additional, Walker, K. A., additional, and Wang, R. H. J., additional

Published
2013
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27. Validation of ACE and OSIRIS ozone and NO2 measurements using ground-based instruments at 80° N

Author

Adams, C., primary, Strong, K., additional, Batchelor, R. L., additional, Bernath, P. F., additional, Brohede, S., additional, Boone, C., additional, Degenstein, D., additional, Daffer, W. H., additional, Drummond, J. R., additional, Fogal, P. F., additional, Farahani, E., additional, Fayt, C., additional, Fraser, A., additional, Goutail, F., additional, Hendrick, F., additional, Kolonjari, F., additional, Lindenmaier, R., additional, Manney, G., additional, McElroy, C. T., additional, McLinden, C. A., additional, Mendonca, J., additional, Park, J.-H., additional, Pavlovic, B., additional, Pazmino, A., additional, Roth, C., additional, Savastiouk, V., additional, Walker, K. A., additional, Weaver, D., additional, and Zhao, X., additional

Published
2012
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29. A new method to detect long term trends of methane (CH<sub>4</sub>) and nitrous oxide (N<sub>2</sub>O) total columns measured within the NDACC ground-based high resolution solar FTIR network

Author

Angelbratt, J., primary, Mellqvist, J., additional, Blumenstock, T., additional, Borsdorff, T., additional, Brohede, S., additional, Duchatelet, P., additional, Forster, F., additional, Hase, F., additional, Mahieu, E., additional, Murtagh, D., additional, Petersen, A. K., additional, Schneider, M., additional, Sussmann, R., additional, and Urban, J., additional

Published
2011
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33. Validation of NO<sub>2</sub> and NO from the Atmospheric Chemistry Experiment (ACE)

Author

Kerzenmacher, T., primary, Wolff, M. A., additional, Strong, K., additional, Dupuy, E., additional, Walker, K. A., additional, Amekudzi, L. K., additional, Batchelor, R. L., additional, Bernath, P. F., additional, Berthet, G., additional, Blumenstock, T., additional, Boone, C. D., additional, Bramstedt, K., additional, Brogniez, C., additional, Brohede, S., additional, Burrows, J. P., additional, Catoire, V., additional, Dodion, J., additional, Drummond, J. R., additional, Dufour, D. G., additional, Funke, B., additional, Fussen, D., additional, Goutail, F., additional, Griffith, D. W. T., additional, Haley, C. S., additional, Hendrick, F., additional, Höpfner, M., additional, Huret, N., additional, Jones, N., additional, Kar, J., additional, Kramer, I., additional, Llewellyn, E. J., additional, López-Puertas, M., additional, Manney, G., additional, McElroy, C. T., additional, McLinden, C. A., additional, Melo, S., additional, Mikuteit, S., additional, Murtagh, D., additional, Nichitiu, F., additional, Notholt, J., additional, Nowlan, C., additional, Piccolo, C., additional, Pommereau, J.-P., additional, Randall, C., additional, Raspollini, P., additional, Ridolfi, M., additional, Richter, A., additional, Schneider, M., additional, Schrems, O., additional, Silicani, M., additional, Stiller, G. P., additional, Taylor, J., additional, Tétard, C., additional, Toohey, M., additional, Vanhellemont, F., additional, Warneke, T., additional, Zawodny, J. M., additional, and Zou, J., additional

Published
2008
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36. Validation of HNO3, ClONO2, and N2O5 from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS)

Author

Wolff, M. A., primary, Kerzenmacher, T., additional, Strong, K., additional, Walker, K. A., additional, Toohey, M., additional, Dupuy, E., additional, Bernath, P. F., additional, Boone, C. D., additional, Brohede, S., additional, Catoire, V., additional, von Clarmann, T., additional, Coffey, M., additional, Daffer, W. H., additional, De Mazière, M., additional, Duchatelet, P., additional, Glatthor, N., additional, Griffith, D. W. T., additional, Hannigan, J., additional, Hase, F., additional, Höpfner, M., additional, Huret, N., additional, Jones, N., additional, Jucks, K., additional, Kagawa, A., additional, Kasai, Y., additional, Kramer, I., additional, Küllmann, H., additional, Kuttippurath, J., additional, Mahieu, E., additional, Manney, G., additional, McLinden, C., additional, Mébarki, Y., additional, Mikuteit, S., additional, Murtagh, D., additional, Piccolo, C., additional, Raspollini, P., additional, Ridolfi, M., additional, Ruhnke, R., additional, Santee, M., additional, Senten, C., additional, Smale, D., additional, Tétard, C., additional, Urban, J., additional, and Wood, S., additional

Published
2008
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41. OSIRIS.

Author

MCLINDEN, C. A., BOURASSA, A. E., BROHEDE, S., COOPER, M., DEGENSTEIN, D. A., EVANS, W. J. F., GATTINGER, R. L., HALEY, C. S., LLEWELLYN, E. J., LLOYD, N. D., LOEWEN, P., MARTIN, R. V., MCCONNEL, J. C., MCDADE, I. C., MURTAGH, D., RIEGER, L., VON SAVIGNY, C., SHEESE, P. E., SIORS, C. E., and SOLHEIM, B.

Subjects
MICROSPACECRAFT, SATELLITE meteorology, FINLAND. National Technology Agency, ATMOSPHERE, REACTIVE nitrogen species
Abstract

The article focuses on small satellite Odin sponsored by the Swedish National Space Board, the Canadian Space Agency and the National Technology Agency of Finland. Odin started in the 1990s and a second instrument OSIRIS was added to expand the mission's atmospheric observing capabilities. Reactive nitrogen and halogen species are the original focus of the mission. Data collected by OSIRIS are used in assessing trends in important chemical and climate parameters. INSET: SOLUTION OF THE RADIATIVE EQUATION IN LIMB GEOMETRY.

Published
2012
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42. Validation of ACE and OSIRIS ozone and NO2 measurements using ground-based instruments at 80° N.

Author

Adams, C., Strong, K., Batchelor, R. L., Bernath, P. F., Brohede, S., Boone, C., Degenstein, D., Daffer, W. H., Drummond, J. R., Fogal, P. F., Farahani, E., Fayt, C., Fraser, A., Goutail, F., Hendrick, F., Kolonjari, F., Lindenmaier, R., Manney, G., McElroy, C. T., and McLinden, C. A.

Subjects
ATMOSPHERIC chemistry, OPTICAL spectroscopy, SPECTRUM analysis, ATMOSPHERIC nitrous oxide, RESEARCH institutes
Abstract

The article presents a study that compares the optical spectrograph and infrared imager system (OSIRIS) and the atmospheric chemistry experiment (ACE) ozone and NO2 measurements from the space since 2001 to 2003 using ground-based instruments at the Polar Environment Atmospheric Research Laboratory (PEARL) in Eureka, Canada. The study uses four kinds of zenith-sky differential optical absorption spectroscopy. The result indicates that both ACE and OSIRIS continue to perform well.

Published
2012
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43. Technical Note: A trace gas climatology derived from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer dataset.

Author

Jones, A., Walker, K. A., Jin, J. J., Taylor, J. R., Boone, C. D., Bernath, P. F., Brohede, S., Manney, G. L., McLeod, S., Hughes, R., and Daffer, W. H.

Abstract

The Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) aboard the Canadian satellite SCISAT (launched in August 2003) was designed to investigate the composition of the upper troposphere, stratosphere, and mesosphere. ACE-FTS utilizes solar occultation to measure temperature and pressure as well as vertical profiles of over thirty chemical species including O3, H2O, CH4, N2O, CO, NO, NO2, N2O5, HNO3, HCl, ClONO2, CCl3F, CCl2F2, and HF. Global coverage for each species is obtained approximately over a three month period and measurements are made with a vertical resolution of typically 3-4 km. A quality-controlled climatology has been created for each of these 14 baseline species, where individual profiles are averaged over the period of February 2004 to February 2009. Measurements used are from the ACE-FTS version 2.2 data set including updates for O3 and N2O5. The climatological fields are provided on a monthly and three-monthly basis (DJF, MAM, JJA, SON) at 5 degree latitude and equivalent latitude spacing and on 28 pressure surfaces (26 of which are defined by the Stratospheric Processes And their Role in Climate (SPARC) Chemistry Climate Model validation activity). The ACE-FTS climatological dataset is available through the ACE website. [ABSTRACT FROM AUTHOR]

Published
2011
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44. A new method to detect long term trends of methane (CH4) and nitrous oxide (N2O) total columns measured within the NDACC ground-based high resolution solar FTIR network.

Author

Angelbratt, J., Mellqvist, J., Blumenstock, T., Borsdorff, T., Brohede, S., Duchatelet, P., Forster, F., Hase, F., Mahieu, E., Murtagh, D., Petersen, A. K., Schneider, M., Sussmann, R., and Urban, J.

Subjects
METHANE, NITROUS oxide, FOURIER transform infrared spectroscopy, ATMOSPHERIC chemistry, REGRESSION analysis, AIR pressure, CARBON monoxide, HYDROGEN fluoride
Abstract

Total columns measured with the ground-based solar FTIR technique are highly variable in time due to atmospheric chemistry and dynamics in the atmosphere above the measurement station. In this paper, a multiple regression model with anomalies of air pressure, total columns of hydrogen fluoride (HF) and carbon monoxide (CO) and tropopause height are used to reduce the variability in the methane (CH4) and nitrous oxide (N2O) total columns to estimate reliable linear trends with as small uncertainties as possible. The method is developed at the Harestua station (60° N, 11° E, 600ma.s.l.) and used on three other European FTIR stations, i.e. Jungfraujoch (47°N, 8° E, 3600ma.s.l.), Zugspitze (47° N, 11° E, 3000ma.s.l.), and Kiruna (68° N, 20° E, 400 ma.s.l.). Linear CH4 trends between 0.13±0.01-0.25±0.02%yr-1 were estimated for all stations in the 1996-2009 period. A piecewise model with three separate linear trends, connected at change points, was used to estimate the short term fluctuations in the CH4 total columns. This model shows a growth in 1996-1999 followed by a period of steady state until 2007. From 2007 until 2009 the atmospheric CH4 amount increases between 0.57±0.22--1.15±0.17%yr-1 . Linear N2O trends between 0.19±0.01--0.40±0.02%yr-1 were estimated for all stations in the 1996-2007 period, here with the strongest trend at Harestua and Kiruna and the lowest at the Alp stations. From the N2O total columns crude tropospheric and stratospheric partial columns were derived, indicating that the observed difference in the N2O trends between the FTIR sites is of stratospheric origin. This agrees well with the N2O measurements by the SMR instrument onboard the Odin satellite showing the highest trends at Harestua, 0.98±0.28%yr-1, and considerably smaller trends at lower latitudes, 0.27±0.25%yr-1. The multiple regression model was compared with two other trend methods, the ordinary linear regression and a Bootstrap algorithm. The multiple regression model estimated CH4 and N2O trends that differed up to 31% compared to the other two methods and had uncertainties that were up to 300% lower. Since the multiple regression method were carefully validated this stresses the importance to account for variability in the total columns when estimating trend from solar FTIR data. [ABSTRACT FROM AUTHOR]

Published
2011
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45. Fast NO2 retrievals from Odin-OSIRIS limb scatter measurements.

Author

Bourassa, A. E., McLinden, C. A., Sioris, C. E., Brohede, S., Bathgate, A. F., Llewellyn, E. J., and Degenstein, D. A.

Subjects
NITRIC oxide, OPTICAL spectroscopy, SPECTRUM analysis, INFRARED imaging, WAVELENGTHS
Abstract

The article presents a study which retrieves vertical profiles of nitric oxide from the measurements made by the Optical Spectrograph and InfraRed Imaging System (OSIRIS) instrument. The study uses a concept technique for the retrieval of nitric oxide using 4 of the 36 OSIRIS measurements at Chappuis band wavelengths. Based on results, the method agrees with the spectral fit method and offers an alternative for application where computational burden is prominent.

Published
2011
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46. Fast NO2 retrievals from Odin-OSIRIS limb scatter measurements.

Author

Bourassa, A. E., McLinden, C. A., Sioris, C. E., Brohede, S., Llewellyn, E. J., and Degenstein, D. A.

Subjects
SPECTROGRAPHS, INFRARED imaging, LIGHT scattering, INFRARED technology, IMAGING systems
Abstract

The article discusses a study that retrieves NO2 from Optical Spectrograph and InfraRed Imaging System (OSIRIS) limb scatter measurements. The study utilizes several different data sets since the 1980's to demostrate the feasibility of retrieving vertical profiles of NO2 from space-based measurements of limb scattered sunlight. It reveals the effectiveness of using a triplet analysis technique in OSIRIS retrievals of ozone at Chappuis band wavelengths.

Published
2010
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47. Validation of NO2 and NO from the Atmospheric Chemistry Experiment (ACE).

Author

Kerzenmacher, T., Wolff, M. A., Strong, K., Dupuy, E., Walker, K. A., Amekudzi, L. K., Batchelor, R. L., Bernath, P. F., Berthet, G., Blumenstock, T., Boone, C. D., Bramstedt, K., Brogniez, C., Brohede, S., Burrows, J. P., Catoire, V., Dodion, J., Drummond, J. R., Dufour, D. G., and Funke, B.

Subjects
ATMOSPHERIC chemistry, SCIENTIFIC apparatus & instruments, SCIENTIFIC observation, SPECTROMETERS, MEASUREMENT
Abstract

Vertical profiles of NO2 and NO have been obtained from solar occultation measurements by the Atmospheric Chemistry Experiment (ACE), using an infrared Fourier Transform Spectrometer (ACE-FTS) and (for NO2) an ultraviolet-visible-near-infrared spectrometer, MAESTRO (Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation). In this paper, the quality of the ACE-FTS version 2.2 NO2 and NO and the MAESTRO version 1.2 NO2 data are assessed using other solar occultation measurements (HALOE, SAGE II, SAGEIII, POAMIII, SCIAMACHY), stellar occultation measurements (GOMOS), limb measurements (MIPAS, OSIRIS), nadir measurements (SCIAMACHY), balloon-borne measurements (SPIRALE, SAOZ) and ground-based measurements (UV-VIS, FTIR). Time differences between the comparison measurements were reduced using either a tight coincidence criterion, or where possible, chemical box models. ACE-FTS NO2 and NO and the MAESTRO NO2 are generally consistent with the correlative data. The ACE-FTS and MAESTRO NO2 volume mixing ratio (VMR) profiles agree with the profiles from other satellite data sets to within about 20% between 25 and 40 km, with the exception of MIPAS ESA (for ACE-FTS) and SAGEII (for ACE-FTS (sunrise) and MAESTRO) and suggest a negative bias between 23 and 40 km of about 10%. MAESTRO reports larger VMR values than the ACE-FTS. In comparisons with HALOE, ACE-FTS NO VMRs typically (on average) agree to ±8% from 22 to 64 km and to +10% from 93 to 105 km, with maxima of 21% and 36%, respectively. Partial column comparisons for NO2 show that there is quite good agreement between the ACE instruments and the FTIRs, with a mean difference of +7.3% for ACEFTS and +12.8% for MAESTRO. [ABSTRACT FROM AUTHOR]

Published
2008
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48. Odin stratospheric proxy NOy measurements and climatology.

Author

Brohede, S., McLinden, C. A., Urban, J., Haley, C. S., Jonsson, A. I., and Murtagh, D.

Subjects
SCIENTIFIC apparatus & instruments, METEOROLOGICAL satellites, SCIENTIFIC observation, STANDARD deviations, MEASUREMENT, CLIMATOLOGY, EQUIPMENT & supplies
Abstract

Five years of OSIRIS (Optical Spectrograph and InfraRed Imager System) NO2 and SMR (Sub-millimetre and Millimetre Radiometer) HNO3 observations from the Odin satellite, combined with data from a photochemical box model, have been used to construct a stratospheric proxy NOy data set including the gases: NO, NO2, HNO3, 2×N2O5 and ClONO2. This Odin NOy climatology is based on all daytime measurements and contains monthly mean and standard deviation, expressed as mixing ratio or number density, as function of latitude or equivalent latitude (5° bins) on 17 vertical layers (altitude, pressure or potential temperature) between 14 and 46 km. Comparisons with coincident NOy profiles from the Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) instrument were used to evaluate several methods to combine Odin observations with model data. This comparison indicates that the most appropriate merging technique uses OSIRIS measurements of NO2, scaled with model NO/NO2 ratios, to estimate NO. The sum of 2×N2O5 and ClONO2 is estimated from uncertainty-based weighted averages of scaled observations of SMR HNO3 and OSIRIS NO2. Comparisons with ACE-FTS suggest the precision (random error) and accuracy (systematic error) of Odin NOy profiles are about 15% and 20%, respectively. Further comparisons between Odin and the Canadian Middle Atmosphere Model (CMAM) show agreement to within 20% and 2 ppb throughout most of the stratosphere except in the polar vortices. The combination of good temporal and spatial coverage, a relatively long data record, and good accuracy and precision make this a valuable NOy product for various atmospheric studies and model assessments. [ABSTRACT FROM AUTHOR]

Published
2008
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49. Validation of HNO3, ClONO2, and N2O5 from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS).

Author

Wolff, M. A., Kerzenmacher, T., Strong, K., Walker, K. A., Toohey, M., Dupuy, E., Bernath, P. F., Boone, C. D., Brohede, S., Catoire, V., von Clarmann, T., Coffey, M., Daffer, w. H., De Mazière, M., Duchatelet, P., Glatthor, N., Griffith, D. W. T., Hannigan, J., Hase, F., and Höpfner, M.

Subjects
ATMOSPHERIC chemistry, SPHERICAL astronomy, SPECTROMETERS, ARTIFICIAL satellites, PHYSICAL geography, PHYSICAL & theoretical chemistry
Abstract

The Atmospheric Chemistry Experiment (ACE) satellite was launched on 12 August 2003. Its two instruments measure vertical profiles of over 30 atmospheric trace gases by analyzing solar occultation spectra in the ultraviolet/visible and infrared wavelength regions. The reservoir gases HNO3, ClONO2, and N2O5 are three of the key species provided by the primary instrument, the ACE Fourier Transform Spectrometer (ACE-FTS). This paper describes the ACE-FTS version 2.2 data products, including the N2O5 update, for the three species and presents validation comparisons with available observations. We have compared volume mixing ratio (VMR) profiles of HNO3, ClONO2, and N2O5 with measurements by other satellite instruments (SMR, MLS, MIPAS), aircraft measurements (ASUR), and single balloon-flights (SPIRALE, FIRS-2). Partial columns of HNO3 and ClONO2 were also compared with measurements by ground-based Fourier Transform Infrared (FTIR) spectrometers. Overall the quality of the ACE-FTS v2.2 HNO3 VMR profiles is good from 18 to 35 km. For the statistical satellite comparisons, the mean absolute differences are generally within ±1 ppbv (±20%) from 18 to 35 km. For MIPAS and MLS comparisons only, mean relative differences lie within ±10% between 10 and 36 km. ACE-FTS HNO3 partial columns (∼15-30 km) show a slight negative bias of -1.3% relative to the ground-based FTIRs at latitudes ranging from 77.8° S-76.5° N. Good agreement between ACEFTS ClONO2 and MIPAS, using the Institut für Meteorologie und Klimaforschung and Instituto de Astrofísica de Andalucía (IMK-IAA) data processor is seen. Mean absolute differences are typically within ±0.01 ppbv between 16 and 27 km and less than +0.09 ppbv between 27 and 34 km. The ClONO2 partial column comparisons show varying degrees of agreement, depending on the location and the quality of the FTIR measurements. Good agreement was found for the comparisons with the midlatitude Jungfraujoch partial columns for which the mean relative difference is 4.7%. ACE-FTS N2O5 has a low bias relative to MIPAS IMK-IAA, reaching -0.25 ppbv at the altitude of the N2O5 maximum (around 30 km). Mean absolute differences at lower altitudes (16-27 km) are typically -0.05 ppbv for MIPAS nighttime and ±0.02 ppbv for MIPAS daytime measurements. [ABSTRACT FROM AUTHOR]

Published
2008
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50. Status of the Odin/OSIRIS stratospheric O3 and NO2 data products.

Author

Haley, C. S. and Brohede, S.

Subjects
*OZONE layer, *STRATOSPHERE, *NITROGEN oxides, *AIR pollution, *ATMOSPHERIC ozone, *SPECTRUM analysis instruments, *INFRARED imaging, *IMAGING systems, *ERROR analysis in mathematics
Abstract

This paper describes the status of the stratospheric ozone and nitrogen dioxide data products from the Optical Spectrograph and InfraRed Imager System (OSIRIS) instrument on the Odin satellite. The current version of the data products is 3.0, covering the period from November 2001 to the present. The O3 and NO2 retrieval methods are reviewed along with an overview of the error analyses and geophysical validation status.PACS Nos.: 07.05.Kf, 07.87.+v, 42.68.Mj, 92.60.hd, 92.60.Ta, 92.60.Vb, 92.70.Cp, 95.75.Fg, 95.75.Rs [ABSTRACT FROM AUTHOR]

Published
2007
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