Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003
International audience The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on ENVISAT has made extensive measurements of polar stratospheric clouds (PSCs) in the northern hemisphere winter 2002/2003. A PSC detection method, based on a ratio of radiances (the cloud index), has been...
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ftccsdartic:oai:HAL:hal-00301452v1 2024-02-11T10:01:49+01:00 Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003 Spang, R. Remedios, J. J. Kramer, L. J. Poole, L. R. Fromm, M. D. Müller, M. Baumgarten, G. Konopka, P. ICG I Earth Observation Science Group Leicester (EOS) Space Research Centre Leicester University of Leicester-University of Leicester Atmospheric Science Competency NASA Langley Research Center Hampton (LaRC) Computational Physics, Inc. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association Leibniz-Institute of Atmospheric Physics (AIP) 2004-10-06 https://hal.science/hal-00301452 https://hal.science/hal-00301452/document https://hal.science/hal-00301452/file/acpd-4-6283-2004.pdf en eng HAL CCSD European Geosciences Union hal-00301452 https://hal.science/hal-00301452 https://hal.science/hal-00301452/document https://hal.science/hal-00301452/file/acpd-4-6283-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301452 Atmospheric Chemistry and Physics Discussions, 2004, 4 (5), pp.6283-6319 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2004 ftccsdartic 2024-01-21T00:58:37Z International audience The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on ENVISAT has made extensive measurements of polar stratospheric clouds (PSCs) in the northern hemisphere winter 2002/2003. A PSC detection method, based on a ratio of radiances (the cloud index), has been implemented for MIPAS and is validated in this study with respect to ground based lidar and space borne occultation measurements. A very good correspondence in PSC sighting and cloud altitude between MIPAS detections and those of other instruments is found for cloud index values less than four. Comparisons with data from the Stratospheric Aerosol and Gas Experiment (SAGE) III are used to show further that the sensitivity of the MIPAS detection method for this threshold value of cloud index is approximately equivalent to an extinction limit of 10 ?3 km ?1 at 1022 nm, a wavelength used by solar occultation experiments. The MIPAS cloud index data are subsequently used to examine, for the first time with any technique, the evolution of PSCs throughout the Arctic polar vortex up to a latitude of 90° north on a near-daily basis. We find that the winter of 2002/2003 is characterised by three phases of very different PSC activity: First, an unusual, extremely cold phase in the first three weeks of December resulted in high PSC occurrence rates. This was followed by a second phase of only moderate PSC activity from 5?13 January, separated from the first phase by a minor warming event. Finally there was a third phase from February to end of March where only sporadic and mostly weak PSC events took place. The composition of PSCs during the winter period has also been examined, exploiting particularly an infra-red spectral signature which is probably characteristic of NAT. The MIPAS observations show the presence of these particles on a number of occasions in December but very rarely in January. The PSC type differentiation from MIPAS indicates that future comparisons of PSC observations with microphysical and denitrification ... Article in Journal/Newspaper 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 |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Spang, R. Remedios, J. J. Kramer, L. J. Poole, L. R. Fromm, M. D. Müller, M. Baumgarten, G. Konopka, P. Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003 |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on ENVISAT has made extensive measurements of polar stratospheric clouds (PSCs) in the northern hemisphere winter 2002/2003. A PSC detection method, based on a ratio of radiances (the cloud index), has been implemented for MIPAS and is validated in this study with respect to ground based lidar and space borne occultation measurements. A very good correspondence in PSC sighting and cloud altitude between MIPAS detections and those of other instruments is found for cloud index values less than four. Comparisons with data from the Stratospheric Aerosol and Gas Experiment (SAGE) III are used to show further that the sensitivity of the MIPAS detection method for this threshold value of cloud index is approximately equivalent to an extinction limit of 10 ?3 km ?1 at 1022 nm, a wavelength used by solar occultation experiments. The MIPAS cloud index data are subsequently used to examine, for the first time with any technique, the evolution of PSCs throughout the Arctic polar vortex up to a latitude of 90° north on a near-daily basis. We find that the winter of 2002/2003 is characterised by three phases of very different PSC activity: First, an unusual, extremely cold phase in the first three weeks of December resulted in high PSC occurrence rates. This was followed by a second phase of only moderate PSC activity from 5?13 January, separated from the first phase by a minor warming event. Finally there was a third phase from February to end of March where only sporadic and mostly weak PSC events took place. The composition of PSCs during the winter period has also been examined, exploiting particularly an infra-red spectral signature which is probably characteristic of NAT. The MIPAS observations show the presence of these particles on a number of occasions in December but very rarely in January. The PSC type differentiation from MIPAS indicates that future comparisons of PSC observations with microphysical and denitrification ... |
author2 |
ICG I Earth Observation Science Group Leicester (EOS) Space Research Centre Leicester University of Leicester-University of Leicester Atmospheric Science Competency NASA Langley Research Center Hampton (LaRC) Computational Physics, Inc. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association Leibniz-Institute of Atmospheric Physics (AIP) |
format |
Article in Journal/Newspaper |
author |
Spang, R. Remedios, J. J. Kramer, L. J. Poole, L. R. Fromm, M. D. Müller, M. Baumgarten, G. Konopka, P. |
author_facet |
Spang, R. Remedios, J. J. Kramer, L. J. Poole, L. R. Fromm, M. D. Müller, M. Baumgarten, G. Konopka, P. |
author_sort |
Spang, R. |
title |
Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003 |
title_short |
Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003 |
title_full |
Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003 |
title_fullStr |
Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003 |
title_full_unstemmed |
Polar stratospheric cloud observations by MIPAS on ENVISAT: detection method, validation and analysis of the northern hemisphere winter 2002/2003 |
title_sort |
polar stratospheric cloud observations by mipas on envisat: detection method, validation and analysis of the northern hemisphere winter 2002/2003 |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00301452 https://hal.science/hal-00301452/document https://hal.science/hal-00301452/file/acpd-4-6283-2004.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-00301452 Atmospheric Chemistry and Physics Discussions, 2004, 4 (5), pp.6283-6319 |
op_relation |
hal-00301452 https://hal.science/hal-00301452 https://hal.science/hal-00301452/document https://hal.science/hal-00301452/file/acpd-4-6283-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790597615938699264 |