Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere
International audience Global Ozone Monitoring by Occultation of Stars (GOMOS) on board Envisat has performed about 440 000 night-time occultations during 2002–2012. Self-calibrating measurement principle, good vertical resolution and the wide vertical range from the troposphere up to the lower ther...
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ftccsdartic:oai:HAL:insu-01312505v1 2023-05-15T15:16:16+02:00 Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere Sofieva, Viktoria Hakkarainen, Janne Ialongo, Iolanda Kyrölä, Erkki Laine, Marko Tamminen, Johanna Hauchecorne, Alain Bertaux, Jean-Loup Dalaudier, Francis Fussen, Didier Blanot, Laurent Barrot, Gilbert Finnish Meteorological Institute (FMI) 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) Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB) Analytic and Computational Research, Inc. - Earth Sciences (ACRI-ST) Prague, Czech Republic 2016-05-09 https://hal-insu.archives-ouvertes.fr/insu-01312505 en eng HAL CCSD insu-01312505 https://hal-insu.archives-ouvertes.fr/insu-01312505 Living Planet Symposium 2016 https://hal-insu.archives-ouvertes.fr/insu-01312505 Living Planet Symposium 2016, May 2016, Prague, Czech Republic [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/conferenceObject Poster communications 2016 ftccsdartic 2021-11-21T02:49:09Z International audience Global Ozone Monitoring by Occultation of Stars (GOMOS) on board Envisat has performed about 440 000 night-time occultations during 2002–2012. Self-calibrating measurement principle, good vertical resolution and the wide vertical range from the troposphere up to the lower thermosphere make GOMOS profiles interesting for different analyses. Vertical profiles of ozone, NO2, NO3 and aerosols are retrieved from night-time UV-VIS spectrometer measurements.The GOMOS ozone data are of high quality in the stratosphere and the mesosphere, but the current operational retrieval algorithm (IPF v.6) is not optimized for retrievals in the upper troposphere–lower stratosphere (UTLS). In particular, validation of GOMOS profiles against ozonesonde data has revealed a substantial positive bias (up to 100%) in the UTLS region. The retrievals in the UTLS are challenging because of low signal-to-noise ratio and the presence of clouds.In this work, we present two advanced GOMOS algorithms, which are optimized for retrievals in the UTLS. One of the algorithms relies on the operational two-step inversion (the spectral inversion followed by the vertical inversion), while another uses one-step approach, i.e., direct fitting the profiles of all constituents. In the new retrievals, a special attention is paid to outlier filtering, the choice of aerosol extinction model, and the vertical resolution.The validation of new retrieved ozone profiles with ozonesondes has shown dramatic reduction of GOMOS ozone biases in the UTLS, for both algorithms. The new GOMOS ozone profiles are also in a very good agreement with measurements by MIPAS, ACE-FTS and OSIRIS satellite instruments in the UTLS. The known geophysical phenomena in the UTLS ozone are well reproduced with the advanced retrievals. In addition, we present GOMOS ozone profiles during the unprecedented stratospheric ozone loss in the Arctic in 2011.These studies have been performed in the framework of ESA-funded ALGOM (GOMOS Level 2 algorithm evolution studies) ... Conference Object Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Sofieva, Viktoria Hakkarainen, Janne Ialongo, Iolanda Kyrölä, Erkki Laine, Marko Tamminen, Johanna Hauchecorne, Alain Bertaux, Jean-Loup Dalaudier, Francis Fussen, Didier Blanot, Laurent Barrot, Gilbert Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience Global Ozone Monitoring by Occultation of Stars (GOMOS) on board Envisat has performed about 440 000 night-time occultations during 2002–2012. Self-calibrating measurement principle, good vertical resolution and the wide vertical range from the troposphere up to the lower thermosphere make GOMOS profiles interesting for different analyses. Vertical profiles of ozone, NO2, NO3 and aerosols are retrieved from night-time UV-VIS spectrometer measurements.The GOMOS ozone data are of high quality in the stratosphere and the mesosphere, but the current operational retrieval algorithm (IPF v.6) is not optimized for retrievals in the upper troposphere–lower stratosphere (UTLS). In particular, validation of GOMOS profiles against ozonesonde data has revealed a substantial positive bias (up to 100%) in the UTLS region. The retrievals in the UTLS are challenging because of low signal-to-noise ratio and the presence of clouds.In this work, we present two advanced GOMOS algorithms, which are optimized for retrievals in the UTLS. One of the algorithms relies on the operational two-step inversion (the spectral inversion followed by the vertical inversion), while another uses one-step approach, i.e., direct fitting the profiles of all constituents. In the new retrievals, a special attention is paid to outlier filtering, the choice of aerosol extinction model, and the vertical resolution.The validation of new retrieved ozone profiles with ozonesondes has shown dramatic reduction of GOMOS ozone biases in the UTLS, for both algorithms. The new GOMOS ozone profiles are also in a very good agreement with measurements by MIPAS, ACE-FTS and OSIRIS satellite instruments in the UTLS. The known geophysical phenomena in the UTLS ozone are well reproduced with the advanced retrievals. In addition, we present GOMOS ozone profiles during the unprecedented stratospheric ozone loss in the Arctic in 2011.These studies have been performed in the framework of ESA-funded ALGOM (GOMOS Level 2 algorithm evolution studies) ... |
author2 |
Finnish Meteorological Institute (FMI) 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) Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB) Analytic and Computational Research, Inc. - Earth Sciences (ACRI-ST) |
format |
Conference Object |
author |
Sofieva, Viktoria Hakkarainen, Janne Ialongo, Iolanda Kyrölä, Erkki Laine, Marko Tamminen, Johanna Hauchecorne, Alain Bertaux, Jean-Loup Dalaudier, Francis Fussen, Didier Blanot, Laurent Barrot, Gilbert |
author_facet |
Sofieva, Viktoria Hakkarainen, Janne Ialongo, Iolanda Kyrölä, Erkki Laine, Marko Tamminen, Johanna Hauchecorne, Alain Bertaux, Jean-Loup Dalaudier, Francis Fussen, Didier Blanot, Laurent Barrot, Gilbert |
author_sort |
Sofieva, Viktoria |
title |
Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere |
title_short |
Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere |
title_full |
Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere |
title_fullStr |
Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere |
title_full_unstemmed |
Improved GOMOS/Envisat retrievals: focus on the upper troposphere and the lower stratosphere |
title_sort |
improved gomos/envisat retrievals: focus on the upper troposphere and the lower stratosphere |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01312505 |
op_coverage |
Prague, Czech Republic |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Living Planet Symposium 2016 https://hal-insu.archives-ouvertes.fr/insu-01312505 Living Planet Symposium 2016, May 2016, Prague, Czech Republic |
op_relation |
insu-01312505 https://hal-insu.archives-ouvertes.fr/insu-01312505 |
_version_ |
1766346562202501120 |