Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight
International audience Limb measurements provided by the SCanning Imaging Absorption spectrometer for Atmospheric CHartographY (SCIAMACHY) on the ENVISAT satellite allow retrieving stratospheric profiles of various trace gases on a global scale, among them BrO for the first time. For limb observatio...
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ftccsdartic:oai:HAL:hal-00303178v1 2023-11-12T04:13:37+01:00 Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight Pu??te, J. Kühl, S. Deutschmann, T. Platt, U. Wagner, T. Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft Institute of Atomic Physics and Spectroscopy University of Latvia (LU) Institute of Environmental Physics Heidelberg (IUP) Universität Heidelberg Heidelberg = Heidelberg University 2007-11-19 https://hal.science/hal-00303178 https://hal.science/hal-00303178/document https://hal.science/hal-00303178/file/acpd-7-16155-2007.pdf en eng HAL CCSD European Geosciences Union hal-00303178 https://hal.science/hal-00303178 https://hal.science/hal-00303178/document https://hal.science/hal-00303178/file/acpd-7-16155-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303178 Atmospheric Chemistry and Physics Discussions, 2007, 7 (6), pp.16155-16183 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2023-10-21T23:11:40Z International audience Limb measurements provided by the SCanning Imaging Absorption spectrometer for Atmospheric CHartographY (SCIAMACHY) on the ENVISAT satellite allow retrieving stratospheric profiles of various trace gases on a global scale, among them BrO for the first time. For limb observations in the UV/VIS spectral region the instrument measures scattered light with a complex distribution of light paths: the light is measured at different elevation angles and can be scattered or absorbed in the atmosphere or reflected by the ground. By means of spectroscopy and radiative transfer modelling the measurements can be inverted to retrieve the vertical distribution of stratospheric trace gases. A full spherical 3-D Monte Carlo radiative transfer model "Tracy-II" is applied in this study. The Monte Carlo method benefits from conceptual simplicity and allows realizing the concept of full spherical geometry of the atmosphere and also its 3-D properties, which is important for a realistic description of the limb geometry. Furthermore it allows accounting for horizontal gradients in the distribution of trace gases. In this study the effect ofhorizontal inhomogeneous distributions of trace gases on the retrieval of profiles from limb measurements of scattered UV/VIS light is investigated. We introduce a method to correct for this effect by combining consecutive limb scanning sequences and utilizing the overlap in their measurement sensitivity regions. It is found that if horizontal inhomogenity is not properly accounted for, typical errors of 20% for NO 2 and up to 50% for OClO around the altitude of the profile peak can arise for measurements close to the Arctic polar vortex boundary in boreal winter. Article in Journal/Newspaper Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic |
institution |
Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Pu??te, J. Kühl, S. Deutschmann, T. Platt, U. Wagner, T. Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Limb measurements provided by the SCanning Imaging Absorption spectrometer for Atmospheric CHartographY (SCIAMACHY) on the ENVISAT satellite allow retrieving stratospheric profiles of various trace gases on a global scale, among them BrO for the first time. For limb observations in the UV/VIS spectral region the instrument measures scattered light with a complex distribution of light paths: the light is measured at different elevation angles and can be scattered or absorbed in the atmosphere or reflected by the ground. By means of spectroscopy and radiative transfer modelling the measurements can be inverted to retrieve the vertical distribution of stratospheric trace gases. A full spherical 3-D Monte Carlo radiative transfer model "Tracy-II" is applied in this study. The Monte Carlo method benefits from conceptual simplicity and allows realizing the concept of full spherical geometry of the atmosphere and also its 3-D properties, which is important for a realistic description of the limb geometry. Furthermore it allows accounting for horizontal gradients in the distribution of trace gases. In this study the effect ofhorizontal inhomogeneous distributions of trace gases on the retrieval of profiles from limb measurements of scattered UV/VIS light is investigated. We introduce a method to correct for this effect by combining consecutive limb scanning sequences and utilizing the overlap in their measurement sensitivity regions. It is found that if horizontal inhomogenity is not properly accounted for, typical errors of 20% for NO 2 and up to 50% for OClO around the altitude of the profile peak can arise for measurements close to the Arctic polar vortex boundary in boreal winter. |
author2 |
Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft Institute of Atomic Physics and Spectroscopy University of Latvia (LU) Institute of Environmental Physics Heidelberg (IUP) Universität Heidelberg Heidelberg = Heidelberg University |
format |
Article in Journal/Newspaper |
author |
Pu??te, J. Kühl, S. Deutschmann, T. Platt, U. Wagner, T. |
author_facet |
Pu??te, J. Kühl, S. Deutschmann, T. Platt, U. Wagner, T. |
author_sort |
Pu??te, J. |
title |
Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight |
title_short |
Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight |
title_full |
Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight |
title_fullStr |
Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight |
title_full_unstemmed |
Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight |
title_sort |
accounting for the effect of horizontal gradients in limb measurements of scattered sunlight |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00303178 https://hal.science/hal-00303178/document https://hal.science/hal-00303178/file/acpd-7-16155-2007.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303178 Atmospheric Chemistry and Physics Discussions, 2007, 7 (6), pp.16155-16183 |
op_relation |
hal-00303178 https://hal.science/hal-00303178 https://hal.science/hal-00303178/document https://hal.science/hal-00303178/file/acpd-7-16155-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331538776522752 |