Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau
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 paper, we carry out an observational analysis of two shallow fog clouds forming at cirrus-tempe...
Main Authors: | , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/egusphere-2022-544 https://noa.gwlb.de/receive/cop_mods_00061673 https://egusphere.copernicus.org/preprints/egusphere-2022-544/egusphere-2022-544.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00061673 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00061673 2023-05-15T13:49:21+02:00 Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew J. Madeleine, Jean-Baptiste Berne, Alexis 2022-06 electronic https://doi.org/10.5194/egusphere-2022-544 https://noa.gwlb.de/receive/cop_mods_00061673 https://egusphere.copernicus.org/preprints/egusphere-2022-544/egusphere-2022-544.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-544 https://noa.gwlb.de/receive/cop_mods_00061673 https://egusphere.copernicus.org/preprints/egusphere-2022-544/egusphere-2022-544.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-544 2022-07-03T23:11:41Z 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 paper, we carry out an observational analysis of two shallow fog clouds forming at cirrus-temperatures - that is, temperatures lower than 235 K - at Dome C, inner 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. To our knowledge, this is the first time that in situ observations show that this nucleation pathway can be at the origin of an ice fog. Once nucleation occurs, the relative humidity gradually decreases down to subsaturated values with respect to ice in a few hours, likely owing to vapour deposition onto ice crystals and turbulent mixing. The development of fog is tightly coupled with the dynamics of the boundary-layer which, in the first study case, experiences a weak diurnal cycle while in the second case, transits from a very stable to a weakly stable dynamical regime. Overall, this paper highlights the potential of the site of Dome C for carrying out observational studies of cloud microphysical processes in natural conditions and using in-situ ground-based instruments. Article in Journal/Newspaper Antarc* Antarctic Niedersächsisches Online-Archiv NOA Antarctic The Antarctic |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew J. Madeleine, Jean-Baptiste Berne, Alexis Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau |
topic_facet |
article Verlagsveröffentlichung |
description |
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 paper, we carry out an observational analysis of two shallow fog clouds forming at cirrus-temperatures - that is, temperatures lower than 235 K - at Dome C, inner 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. To our knowledge, this is the first time that in situ observations show that this nucleation pathway can be at the origin of an ice fog. Once nucleation occurs, the relative humidity gradually decreases down to subsaturated values with respect to ice in a few hours, likely owing to vapour deposition onto ice crystals and turbulent mixing. The development of fog is tightly coupled with the dynamics of the boundary-layer which, in the first study case, experiences a weak diurnal cycle while in the second case, transits from a very stable to a weakly stable dynamical regime. Overall, this paper highlights the potential of the site of Dome C for carrying out observational studies of cloud microphysical processes in natural conditions and using in-situ ground-based instruments. |
format |
Article in Journal/Newspaper |
author |
Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew J. Madeleine, Jean-Baptiste Berne, Alexis |
author_facet |
Vignon, Étienne Raillard, Lea Genthon, Christophe Del Guasta, Massimo Heymsfield, Andrew J. Madeleine, Jean-Baptiste Berne, Alexis |
author_sort |
Vignon, Étienne |
title |
Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau |
title_short |
Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau |
title_full |
Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau |
title_fullStr |
Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau |
title_full_unstemmed |
Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau |
title_sort |
ice fog observed at cirrus temperatures at dome c, antarctic plateau |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-544 https://noa.gwlb.de/receive/cop_mods_00061673 https://egusphere.copernicus.org/preprints/egusphere-2022-544/egusphere-2022-544.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://doi.org/10.5194/egusphere-2022-544 https://noa.gwlb.de/receive/cop_mods_00061673 https://egusphere.copernicus.org/preprints/egusphere-2022-544/egusphere-2022-544.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-544 |
_version_ |
1766251229317431296 |