Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica
Sublimation of snow particles during transport has been recognized as an important ablation process on the Antarctic ice sheet. The resulting increase in moisture content and cooling of the ambient air are thermodynamic negative feedbacks that both contribute to increase the relative humidity of the...
Published in: | The Cryosphere |
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Copernicus Publications
2019
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00049834 2023-05-15T13:54:47+02:00 Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica Amory, Charles Kittel, Christoph 2019-12 electronic https://doi.org/10.5194/tc-13-3405-2019 https://noa.gwlb.de/receive/cop_mods_00049834 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049453/tc-13-3405-2019.pdf https://tc.copernicus.org/articles/13/3405/2019/tc-13-3405-2019.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-3405-2019 https://noa.gwlb.de/receive/cop_mods_00049834 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049453/tc-13-3405-2019.pdf https://tc.copernicus.org/articles/13/3405/2019/tc-13-3405-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/tc-13-3405-2019 2022-02-08T22:37:07Z Sublimation of snow particles during transport has been recognized as an important ablation process on the Antarctic ice sheet. The resulting increase in moisture content and cooling of the ambient air are thermodynamic negative feedbacks that both contribute to increase the relative humidity of the air, inhibiting further sublimation when saturation is reached. This self-limiting effect and the associated development of saturated near-surface air layers in drifting snow conditions have mainly been described through modelling studies and a few field observations. A set of meteorological data, including drifting snow mass fluxes and vertical profiles of relative humidity, collected at site D17 in coastal Adélie Land (East Antarctica) during 2013 is used to study the relationship between saturation of the near-surface atmosphere and the occurrence of drifting snow in a katabatic wind region that is among the most prone to snow transport by wind. Atmospheric moistening by the sublimation of the windborne snow particles generally results in a strong increase in relative humidity with the magnitude of drifting snow and a decrease in its vertical gradient, suggesting that windborne-snow sublimation can be an important contributor to the local near-surface moisture budget. Despite a high incidence of drifting snow at the measurement location (60.1 % of the time), saturation, when attained, is however most often limited to a thin air layer below 1 m above ground. The development of a near-surface saturated air layer up to the highest measurement level of 5.5 m is observed in only 8.2 % of the drifting snow occurrences or 6.3 % of the time and mainly occurs in strong wind speed and drift conditions. This relatively rare occurrence of ambient saturation is explained by the likely existence of moisture-removal mechanisms inherent to the katabatic and turbulent nature of the boundary-layer flow that weaken the negative feedback of windborne-snow sublimation. Such mechanisms, potentially quite active in katabatic-generated windborne-snow layers all over Antarctica, may be very important in understanding the surface mass and atmospheric moisture budgets of the ice sheet by enhancing windborne-snow sublimation. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet The Cryosphere Niedersächsisches Online-Archiv NOA Antarctic The Antarctic East Antarctica The Cryosphere 13 12 3405 3412 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Amory, Charles Kittel, Christoph Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Sublimation of snow particles during transport has been recognized as an important ablation process on the Antarctic ice sheet. The resulting increase in moisture content and cooling of the ambient air are thermodynamic negative feedbacks that both contribute to increase the relative humidity of the air, inhibiting further sublimation when saturation is reached. This self-limiting effect and the associated development of saturated near-surface air layers in drifting snow conditions have mainly been described through modelling studies and a few field observations. A set of meteorological data, including drifting snow mass fluxes and vertical profiles of relative humidity, collected at site D17 in coastal Adélie Land (East Antarctica) during 2013 is used to study the relationship between saturation of the near-surface atmosphere and the occurrence of drifting snow in a katabatic wind region that is among the most prone to snow transport by wind. Atmospheric moistening by the sublimation of the windborne snow particles generally results in a strong increase in relative humidity with the magnitude of drifting snow and a decrease in its vertical gradient, suggesting that windborne-snow sublimation can be an important contributor to the local near-surface moisture budget. Despite a high incidence of drifting snow at the measurement location (60.1 % of the time), saturation, when attained, is however most often limited to a thin air layer below 1 m above ground. The development of a near-surface saturated air layer up to the highest measurement level of 5.5 m is observed in only 8.2 % of the drifting snow occurrences or 6.3 % of the time and mainly occurs in strong wind speed and drift conditions. This relatively rare occurrence of ambient saturation is explained by the likely existence of moisture-removal mechanisms inherent to the katabatic and turbulent nature of the boundary-layer flow that weaken the negative feedback of windborne-snow sublimation. Such mechanisms, potentially quite active in katabatic-generated windborne-snow layers all over Antarctica, may be very important in understanding the surface mass and atmospheric moisture budgets of the ice sheet by enhancing windborne-snow sublimation. |
format |
Article in Journal/Newspaper |
author |
Amory, Charles Kittel, Christoph |
author_facet |
Amory, Charles Kittel, Christoph |
author_sort |
Amory, Charles |
title |
Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica |
title_short |
Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica |
title_full |
Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica |
title_fullStr |
Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica |
title_full_unstemmed |
Brief communication: Rare ambient saturation during drifting snow occurrences at a coastal location of East Antarctica |
title_sort |
brief communication: rare ambient saturation during drifting snow occurrences at a coastal location of east antarctica |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-3405-2019 https://noa.gwlb.de/receive/cop_mods_00049834 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049453/tc-13-3405-2019.pdf https://tc.copernicus.org/articles/13/3405/2019/tc-13-3405-2019.pdf |
geographic |
Antarctic The Antarctic East Antarctica |
geographic_facet |
Antarctic The Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-3405-2019 https://noa.gwlb.de/receive/cop_mods_00049834 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049453/tc-13-3405-2019.pdf https://tc.copernicus.org/articles/13/3405/2019/tc-13-3405-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-13-3405-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
12 |
container_start_page |
3405 |
op_container_end_page |
3412 |
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1766260890312638464 |