Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ...
<!--!introduction!--> As the near-surface atmosphere over the Antarctic Plateau is cold and pristine, its physico-chemical conditions resemble to a certain extent those of the high troposphere where cirrus clouds form. In this study, we carry out an observational analysis of two shallow fog cl...
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GFZ German Research Centre for Geosciences
2023
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ftdatacite:10.57757/iugg23-2382 2023-07-23T04:15:52+02:00 Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ... Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew Madeleine, Jean-Baptiste Berne, Alexis 2023 https://dx.doi.org/10.57757/iugg23-2382 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018393 unknown GFZ German Research Centre for Geosciences Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 Article ConferencePaper Oral 2023 ftdatacite https://doi.org/10.57757/iugg23-2382 2023-07-03T17:53:19Z <!--!introduction!--> As the near-surface atmosphere over the Antarctic Plateau is cold and pristine, its physico-chemical conditions resemble to a certain extent those of the high troposphere where cirrus clouds form. In this study, we carry out an observational analysis of two shallow fog clouds forming in situ at cirrus temperatures – that is, temperatures lower than 235 K – at Dome C, Antarctic Plateau. The combination of lidar profiles with temperature and humidity measurements from advanced thermo-hygrometers along a 45 m mast makes it possible to characterise the formation and development of the fog. High supersaturations with respect to ice are observed before the initiation of fog, and the values attained suggest that the nucleation process at play is the homogeneous freezing of solution aerosol droplets. Once nucleation occurs, the relative humidity decreases down to subsaturated values with respect to ice in a few hours, owing to vapour deposition onto ice crystals and turbulent mixing. The ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... Conference Object Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic |
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DataCite Metadata Store (German National Library of Science and Technology) |
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<!--!introduction!--> As the near-surface atmosphere over the Antarctic Plateau is cold and pristine, its physico-chemical conditions resemble to a certain extent those of the high troposphere where cirrus clouds form. In this study, we carry out an observational analysis of two shallow fog clouds forming in situ at cirrus temperatures – that is, temperatures lower than 235 K – at Dome C, Antarctic Plateau. The combination of lidar profiles with temperature and humidity measurements from advanced thermo-hygrometers along a 45 m mast makes it possible to characterise the formation and development of the fog. High supersaturations with respect to ice are observed before the initiation of fog, and the values attained suggest that the nucleation process at play is the homogeneous freezing of solution aerosol droplets. Once nucleation occurs, the relative humidity decreases down to subsaturated values with respect to ice in a few hours, owing to vapour deposition onto ice crystals and turbulent mixing. The ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
format |
Conference Object |
author |
Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew Madeleine, Jean-Baptiste Berne, Alexis |
spellingShingle |
Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew Madeleine, Jean-Baptiste Berne, Alexis Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ... |
author_facet |
Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew Madeleine, Jean-Baptiste Berne, Alexis |
author_sort |
Vignon, Étienne |
title |
Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ... |
title_short |
Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ... |
title_full |
Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ... |
title_fullStr |
Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ... |
title_full_unstemmed |
Ice fog and supersaturation observed at cirrus temperatures at Dome C, Antarctic Plateau ... |
title_sort |
ice fog and supersaturation observed at cirrus temperatures at dome c, antarctic plateau ... |
publisher |
GFZ German Research Centre for Geosciences |
publishDate |
2023 |
url |
https://dx.doi.org/10.57757/iugg23-2382 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018393 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.57757/iugg23-2382 |
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1772177038884470784 |