Supersaturation, dehydration, and denitrification in Arctic cirrus
International audience A polar cirrus case study is discussed with the help of a one-dimensional model with explicit aerosol and ice microphysics. It is demonstrated that continuous cooling of air in regions with small amounts of ice and slow ice deposition rates of water vapor drives significant in...
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ftinsu:oai:HAL:hal-00295692v1 2023-11-12T04:12:23+01:00 Supersaturation, dehydration, and denitrification in Arctic cirrus Kärcher, B. Deutsches Zentrum für Luft- und Raumfahrt (DLR) 2005-07-20 https://hal.science/hal-00295692 https://hal.science/hal-00295692/document https://hal.science/hal-00295692/file/acp-5-1757-2005.pdf en eng HAL CCSD European Geosciences Union hal-00295692 https://hal.science/hal-00295692 https://hal.science/hal-00295692/document https://hal.science/hal-00295692/file/acp-5-1757-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00295692 Atmospheric Chemistry and Physics, 2005, 5 (7), pp.1757-1772 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftinsu 2023-10-25T16:29:59Z International audience A polar cirrus case study is discussed with the help of a one-dimensional model with explicit aerosol and ice microphysics. It is demonstrated that continuous cooling of air in regions with small amounts of ice and slow ice deposition rates of water vapor drives significant in-cloud supersaturations over ice, with potentially important consequences for heterogeneous halogen activation. Radiatively important cloud properties such as ice crystal size distributions are investigated, showing the presence of high number concentrations of small crystals in the cloud top region at the tropopause, broad but highly variable size spectra in the cloud interior, and mostly large crystals at the cloud base. It is found that weakly forced Arctic cirrostratus are highly efficient at dehydrating upper tropospheric air. Estimating nitric acid uptake in cirrus with an unprecedented treatment of diffusion-limited trapping in growing ice crystals suggests that such clouds could also denitrify upper tropospheric air masses efficiently, but a closer comparison to suitable observations is needed to draw a definite conclusion on this point. It is also shown that low temperatures, high ice supersaturations, and the absence of ice above but close to the cloud top region cause efficient uptake of nitric acid in background aerosol particles. Article in Journal/Newspaper Arctic Institut national des sciences de l'Univers: HAL-INSU Arctic |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Kärcher, B. Supersaturation, dehydration, and denitrification in Arctic cirrus |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience A polar cirrus case study is discussed with the help of a one-dimensional model with explicit aerosol and ice microphysics. It is demonstrated that continuous cooling of air in regions with small amounts of ice and slow ice deposition rates of water vapor drives significant in-cloud supersaturations over ice, with potentially important consequences for heterogeneous halogen activation. Radiatively important cloud properties such as ice crystal size distributions are investigated, showing the presence of high number concentrations of small crystals in the cloud top region at the tropopause, broad but highly variable size spectra in the cloud interior, and mostly large crystals at the cloud base. It is found that weakly forced Arctic cirrostratus are highly efficient at dehydrating upper tropospheric air. Estimating nitric acid uptake in cirrus with an unprecedented treatment of diffusion-limited trapping in growing ice crystals suggests that such clouds could also denitrify upper tropospheric air masses efficiently, but a closer comparison to suitable observations is needed to draw a definite conclusion on this point. It is also shown that low temperatures, high ice supersaturations, and the absence of ice above but close to the cloud top region cause efficient uptake of nitric acid in background aerosol particles. |
author2 |
Deutsches Zentrum für Luft- und Raumfahrt (DLR) |
format |
Article in Journal/Newspaper |
author |
Kärcher, B. |
author_facet |
Kärcher, B. |
author_sort |
Kärcher, B. |
title |
Supersaturation, dehydration, and denitrification in Arctic cirrus |
title_short |
Supersaturation, dehydration, and denitrification in Arctic cirrus |
title_full |
Supersaturation, dehydration, and denitrification in Arctic cirrus |
title_fullStr |
Supersaturation, dehydration, and denitrification in Arctic cirrus |
title_full_unstemmed |
Supersaturation, dehydration, and denitrification in Arctic cirrus |
title_sort |
supersaturation, dehydration, and denitrification in arctic cirrus |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00295692 https://hal.science/hal-00295692/document https://hal.science/hal-00295692/file/acp-5-1757-2005.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00295692 Atmospheric Chemistry and Physics, 2005, 5 (7), pp.1757-1772 |
op_relation |
hal-00295692 https://hal.science/hal-00295692 https://hal.science/hal-00295692/document https://hal.science/hal-00295692/file/acp-5-1757-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782330953342910464 |