Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica
peer reviewed Understanding the interannual variability of surface mass balance (SMB) and surface melting in Antarctica is key to quantify the signal-to-noise ratio in climate trends, identify opportunities for multi-year climate predictions and assess the ability of climate models to respond to cli...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus
2020
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Online Access: | https://orbi.uliege.be/handle/2268/244132 https://orbi.uliege.be/bitstream/2268/244132/1/tc-14-229-2020.pdf https://doi.org/10.5194/tc-14-229-2020 |
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ftorbi:oai:orbi.ulg.ac.be:2268/244132 2024-04-21T07:45:14+00:00 Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica Donat-Magnin, Marion Jourdain, Nicolas C. Gallée, Hubert Amory, Charles Kittel, Christoph Fettweis, Xavier Wille, Jonathan D. Favier, Vincent Drira, Amine Agosta, Cécile 2020-01-27 https://orbi.uliege.be/handle/2268/244132 https://orbi.uliege.be/bitstream/2268/244132/1/tc-14-229-2020.pdf https://doi.org/10.5194/tc-14-229-2020 en eng Copernicus urn:issn:1994-0416 urn:issn:1994-0424 https://orbi.uliege.be/handle/2268/244132 info:hdl:2268/244132 https://orbi.uliege.be/bitstream/2268/244132/1/tc-14-229-2020.pdf doi:10.5194/tc-14-229-2020 scopus-id:2-s2.0-85078719230 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess The Cryosphere (2020-01-27) SMB Antarctica Amundsen Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2020 ftorbi https://doi.org/10.5194/tc-14-229-2020 2024-03-27T14:58:15Z peer reviewed Understanding the interannual variability of surface mass balance (SMB) and surface melting in Antarctica is key to quantify the signal-to-noise ratio in climate trends, identify opportunities for multi-year climate predictions and assess the ability of climate models to respond to climate variability. Here we simulate summer SMB and surface melting from 1979 to 2017 using the Regional Atmosphere Model (MAR) at 10 km resolution over the drainage basins of the Amundsen Sea glaciers in West Antarctica. Our simulations reproduce the mean present-day climate in terms of near-surface temperature (mean overestimation of 0.10 ∘C), near-surface wind speed (mean underestimation of 0.42 m s−1), and SMB (relative bias <20 % over Thwaites glacier). The simulated interannual variability of SMB and melting is also close to observation-based estimates. For all the Amundsen glacial drainage basins, the interannual variability of summer SMB and surface melting is driven by two distinct mechanisms: high summer SMB tends to occur when the Amundsen Sea Low (ASL) is shifted southward and westward, while high summer melt rates tend to occur when ASL is shallower (i.e. anticyclonic anomaly). Both mechanisms create a northerly flow anomaly that increases moisture convergence and cloud cover over the Amundsen Sea and therefore favors snowfall and downward longwave radiation over the ice sheet. The part of interannual summer SMB variance explained by the ASL longitudinal migrations increases westward and reaches 40 % for Getz. Interannual variation in the ASL relative central pressure is the largest driver of melt rate variability, with 11 % to 21 % of explained variance (increasing westward). While high summer SMB and melt rates are both favored by positive phases of El Niño–Southern Oscillation (ENSO), the Southern Oscillation Index (SOI) only explains 5 % to 16 % of SMB or melt rate interannual variance in our simulations, with moderate statistical significance. However, the part explained by SOI in the previous ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Ice Sheet The Cryosphere Thwaites Glacier West Antarctica University of Liège: ORBi (Open Repository and Bibliography) The Cryosphere 14 1 229 249 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
SMB Antarctica Amundsen Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
SMB Antarctica Amundsen Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Donat-Magnin, Marion Jourdain, Nicolas C. Gallée, Hubert Amory, Charles Kittel, Christoph Fettweis, Xavier Wille, Jonathan D. Favier, Vincent Drira, Amine Agosta, Cécile Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica |
topic_facet |
SMB Antarctica Amundsen Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed Understanding the interannual variability of surface mass balance (SMB) and surface melting in Antarctica is key to quantify the signal-to-noise ratio in climate trends, identify opportunities for multi-year climate predictions and assess the ability of climate models to respond to climate variability. Here we simulate summer SMB and surface melting from 1979 to 2017 using the Regional Atmosphere Model (MAR) at 10 km resolution over the drainage basins of the Amundsen Sea glaciers in West Antarctica. Our simulations reproduce the mean present-day climate in terms of near-surface temperature (mean overestimation of 0.10 ∘C), near-surface wind speed (mean underestimation of 0.42 m s−1), and SMB (relative bias <20 % over Thwaites glacier). The simulated interannual variability of SMB and melting is also close to observation-based estimates. For all the Amundsen glacial drainage basins, the interannual variability of summer SMB and surface melting is driven by two distinct mechanisms: high summer SMB tends to occur when the Amundsen Sea Low (ASL) is shifted southward and westward, while high summer melt rates tend to occur when ASL is shallower (i.e. anticyclonic anomaly). Both mechanisms create a northerly flow anomaly that increases moisture convergence and cloud cover over the Amundsen Sea and therefore favors snowfall and downward longwave radiation over the ice sheet. The part of interannual summer SMB variance explained by the ASL longitudinal migrations increases westward and reaches 40 % for Getz. Interannual variation in the ASL relative central pressure is the largest driver of melt rate variability, with 11 % to 21 % of explained variance (increasing westward). While high summer SMB and melt rates are both favored by positive phases of El Niño–Southern Oscillation (ENSO), the Southern Oscillation Index (SOI) only explains 5 % to 16 % of SMB or melt rate interannual variance in our simulations, with moderate statistical significance. However, the part explained by SOI in the previous ... |
format |
Article in Journal/Newspaper |
author |
Donat-Magnin, Marion Jourdain, Nicolas C. Gallée, Hubert Amory, Charles Kittel, Christoph Fettweis, Xavier Wille, Jonathan D. Favier, Vincent Drira, Amine Agosta, Cécile |
author_facet |
Donat-Magnin, Marion Jourdain, Nicolas C. Gallée, Hubert Amory, Charles Kittel, Christoph Fettweis, Xavier Wille, Jonathan D. Favier, Vincent Drira, Amine Agosta, Cécile |
author_sort |
Donat-Magnin, Marion |
title |
Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica |
title_short |
Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica |
title_full |
Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica |
title_fullStr |
Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica |
title_full_unstemmed |
Interannual variability of summer surface mass balance and surface melting in the Amundsen sector, West Antarctica |
title_sort |
interannual variability of summer surface mass balance and surface melting in the amundsen sector, west antarctica |
publisher |
Copernicus |
publishDate |
2020 |
url |
https://orbi.uliege.be/handle/2268/244132 https://orbi.uliege.be/bitstream/2268/244132/1/tc-14-229-2020.pdf https://doi.org/10.5194/tc-14-229-2020 |
genre |
Amundsen Sea Antarc* Antarctica Ice Sheet The Cryosphere Thwaites Glacier West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica Ice Sheet The Cryosphere Thwaites Glacier West Antarctica |
op_source |
The Cryosphere (2020-01-27) |
op_relation |
urn:issn:1994-0416 urn:issn:1994-0424 https://orbi.uliege.be/handle/2268/244132 info:hdl:2268/244132 https://orbi.uliege.be/bitstream/2268/244132/1/tc-14-229-2020.pdf doi:10.5194/tc-14-229-2020 scopus-id:2-s2.0-85078719230 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-14-229-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
1 |
container_start_page |
229 |
op_container_end_page |
249 |
_version_ |
1796938908012904448 |