Control of the temperature signal in Antarctic proxies by snowfall dynamics
Antarctica, the coldest and driest continent, is home to the largest ice sheet, whose mass is predominantly recharged by snowfall. A common feature of polar regions is the warming associated with snowfall, as moist oceanic air and cloud cover increase the surface temperature. Consequently, snow that...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-17-5373-2023 https://tc.copernicus.org/articles/17/5373/2023/ |
id |
ftcopernicus:oai:publications.copernicus.org:tc114345 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tc114345 2024-09-15T17:48:36+00:00 Control of the temperature signal in Antarctic proxies by snowfall dynamics Servettaz, Aymeric P. M. Agosta, Cécile Kittel, Christoph Orsi, Anaïs J. 2023-12-18 application/pdf https://doi.org/10.5194/tc-17-5373-2023 https://tc.copernicus.org/articles/17/5373/2023/ eng eng doi:10.5194/tc-17-5373-2023 https://tc.copernicus.org/articles/17/5373/2023/ eISSN: 1994-0424 Text 2023 ftcopernicus https://doi.org/10.5194/tc-17-5373-2023 2024-08-28T05:24:15Z Antarctica, the coldest and driest continent, is home to the largest ice sheet, whose mass is predominantly recharged by snowfall. A common feature of polar regions is the warming associated with snowfall, as moist oceanic air and cloud cover increase the surface temperature. Consequently, snow that accumulates on the ice sheet is deposited under unusually warm conditions. Here we use a polar-oriented regional atmospheric model to study the statistical difference between average and snowfall-weighted temperatures. During snowfall, the warm anomaly scales with snowfall amount, with the strongest sensitivity occurring at low-accumulation sites. Heavier snowfall in winter helps to decrease the annual snowfall-weighted temperature, but this effect is overwritten by the event-scale warming associated with precipitating atmospheric systems, which particularly contrast with the extremely cold conditions that occur in winter. Consequently, the seasonal range of snowfall-weighted temperature is reduced by 20 %. On the other hand, the annual snowfall-weighted temperature shows 80 % more interannual variability than the annual temperature due to the irregularity of snowfall occurrence and its associated temperature anomaly. Disturbances of the apparent annual temperature cycle and interannual variability have important consequences for the interpretation of water isotopes in precipitation, which are deposited with snowfall and commonly used for paleotemperature reconstructions from ice cores. Text Antarc* Antarctic Antarctica Ice Sheet Copernicus Publications: E-Journals The Cryosphere 17 12 5373 5389 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Antarctica, the coldest and driest continent, is home to the largest ice sheet, whose mass is predominantly recharged by snowfall. A common feature of polar regions is the warming associated with snowfall, as moist oceanic air and cloud cover increase the surface temperature. Consequently, snow that accumulates on the ice sheet is deposited under unusually warm conditions. Here we use a polar-oriented regional atmospheric model to study the statistical difference between average and snowfall-weighted temperatures. During snowfall, the warm anomaly scales with snowfall amount, with the strongest sensitivity occurring at low-accumulation sites. Heavier snowfall in winter helps to decrease the annual snowfall-weighted temperature, but this effect is overwritten by the event-scale warming associated with precipitating atmospheric systems, which particularly contrast with the extremely cold conditions that occur in winter. Consequently, the seasonal range of snowfall-weighted temperature is reduced by 20 %. On the other hand, the annual snowfall-weighted temperature shows 80 % more interannual variability than the annual temperature due to the irregularity of snowfall occurrence and its associated temperature anomaly. Disturbances of the apparent annual temperature cycle and interannual variability have important consequences for the interpretation of water isotopes in precipitation, which are deposited with snowfall and commonly used for paleotemperature reconstructions from ice cores. |
format |
Text |
author |
Servettaz, Aymeric P. M. Agosta, Cécile Kittel, Christoph Orsi, Anaïs J. |
spellingShingle |
Servettaz, Aymeric P. M. Agosta, Cécile Kittel, Christoph Orsi, Anaïs J. Control of the temperature signal in Antarctic proxies by snowfall dynamics |
author_facet |
Servettaz, Aymeric P. M. Agosta, Cécile Kittel, Christoph Orsi, Anaïs J. |
author_sort |
Servettaz, Aymeric P. M. |
title |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_short |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_full |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_fullStr |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_full_unstemmed |
Control of the temperature signal in Antarctic proxies by snowfall dynamics |
title_sort |
control of the temperature signal in antarctic proxies by snowfall dynamics |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-5373-2023 https://tc.copernicus.org/articles/17/5373/2023/ |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-17-5373-2023 https://tc.copernicus.org/articles/17/5373/2023/ |
op_doi |
https://doi.org/10.5194/tc-17-5373-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
12 |
container_start_page |
5373 |
op_container_end_page |
5389 |
_version_ |
1810290032271949824 |