Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling
Abstract. About 20 % of all snow accumulation in Antarctica occurs on the ice shelves. There, ice rises control the spatial surface mass balance (SMB) distribution by inducing snowfall variability and wind erosion due to their topography. Moreover these ice rises buttress the ice flow and represent...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/313242 2024-04-28T07:58:50+00:00 Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling Kausch, Thore Lhermitte, Stef Lenaerts, Jan T M Wever, Nander Inoue, Mana Pattyn, Frank Sun, Sainan Wauthy, Sarah Tison, Jean-Louis van de Berg, Willem Jan 2020-10-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/313242 https://dipot.ulb.ac.be/dspace/bitstream/2013/313242/1/doi_296886.pdf en eng uri/info:doi/10.5194/tc-14-3367-2020 uri/info:scp/85092639675 https://dipot.ulb.ac.be/dspace/bitstream/2013/313242/1/doi_296886.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/313242 1 full-text file(s): info:eu-repo/semantics/openAccess The Cryosphere, 14 (10 Sciences exactes et naturelles info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2020 ftunivbruxelles 2024-04-10T00:12:21Z Abstract. About 20 % of all snow accumulation in Antarctica occurs on the ice shelves. There, ice rises control the spatial surface mass balance (SMB) distribution by inducing snowfall variability and wind erosion due to their topography. Moreover these ice rises buttress the ice flow and represent ideal drilling locations for ice cores. In this study we assess the connection between snowfall variability and wind erosion to provide a better understanding of how ice rises impact SMB variability, how well this is captured in the regional atmospheric climate model RACMO2 and the implications of this SMB variability for ice rises as an ice core drilling site. By combining ground-penetrating radar (GPR) profiles from two ice rises in Dronning Maud Land with ice core dating, we reconstruct spatial and temporal SMB variations from 1983 to 2018 and compare the observed SMB with output from RACMO2 and SnowModel. Our results show snowfall-driven differences of up to 1.5 times higher SMB on the windward side of both ice rises than on the leeward side as well as a local erosion-driven minimum at the ice divide of the ice rises. RACMO2 captures the snowfall-driven differences but overestimates their magnitude, whereas the erosion on the peak can be reproduced by SnowModel with RACMO2 forcing. Observed temporal variability of the average SMBs, retrieved from the GPR data for four time intervals in the 1983–2018 range, are low at the peak of the easternmost ice rise (∼0.06 mw.e.yr-1), while they are higher (∼0.09 mw.e.yr-1) on the windward side of the ice rise. This implies that at the peak of the ice rise, higher snowfall, driven by orographic uplift, is balanced out by local erosion. As a consequence of this, the SMB recovered from the ice core matches the SMB from the GPR at the peak of the ice rise but not at the windward side of the ice rise, suggesting that the SMB signal is damped in the ice core. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land ice core Ice Shelves The Cryosphere DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles |
spellingShingle |
Sciences exactes et naturelles Kausch, Thore Lhermitte, Stef Lenaerts, Jan T M Wever, Nander Inoue, Mana Pattyn, Frank Sun, Sainan Wauthy, Sarah Tison, Jean-Louis van de Berg, Willem Jan Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling |
topic_facet |
Sciences exactes et naturelles |
description |
Abstract. About 20 % of all snow accumulation in Antarctica occurs on the ice shelves. There, ice rises control the spatial surface mass balance (SMB) distribution by inducing snowfall variability and wind erosion due to their topography. Moreover these ice rises buttress the ice flow and represent ideal drilling locations for ice cores. In this study we assess the connection between snowfall variability and wind erosion to provide a better understanding of how ice rises impact SMB variability, how well this is captured in the regional atmospheric climate model RACMO2 and the implications of this SMB variability for ice rises as an ice core drilling site. By combining ground-penetrating radar (GPR) profiles from two ice rises in Dronning Maud Land with ice core dating, we reconstruct spatial and temporal SMB variations from 1983 to 2018 and compare the observed SMB with output from RACMO2 and SnowModel. Our results show snowfall-driven differences of up to 1.5 times higher SMB on the windward side of both ice rises than on the leeward side as well as a local erosion-driven minimum at the ice divide of the ice rises. RACMO2 captures the snowfall-driven differences but overestimates their magnitude, whereas the erosion on the peak can be reproduced by SnowModel with RACMO2 forcing. Observed temporal variability of the average SMBs, retrieved from the GPR data for four time intervals in the 1983–2018 range, are low at the peak of the easternmost ice rise (∼0.06 mw.e.yr-1), while they are higher (∼0.09 mw.e.yr-1) on the windward side of the ice rise. This implies that at the peak of the ice rise, higher snowfall, driven by orographic uplift, is balanced out by local erosion. As a consequence of this, the SMB recovered from the ice core matches the SMB from the GPR at the peak of the ice rise but not at the windward side of the ice rise, suggesting that the SMB signal is damped in the ice core. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Kausch, Thore Lhermitte, Stef Lenaerts, Jan T M Wever, Nander Inoue, Mana Pattyn, Frank Sun, Sainan Wauthy, Sarah Tison, Jean-Louis van de Berg, Willem Jan |
author_facet |
Kausch, Thore Lhermitte, Stef Lenaerts, Jan T M Wever, Nander Inoue, Mana Pattyn, Frank Sun, Sainan Wauthy, Sarah Tison, Jean-Louis van de Berg, Willem Jan |
author_sort |
Kausch, Thore |
title |
Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling |
title_short |
Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling |
title_full |
Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling |
title_fullStr |
Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling |
title_full_unstemmed |
Impact of coastal East Antarctic ice rises on surface mass balance: insights from observations and modeling |
title_sort |
impact of coastal east antarctic ice rises on surface mass balance: insights from observations and modeling |
publishDate |
2020 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/313242 https://dipot.ulb.ac.be/dspace/bitstream/2013/313242/1/doi_296886.pdf |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land ice core Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land ice core Ice Shelves The Cryosphere |
op_source |
The Cryosphere, 14 (10 |
op_relation |
uri/info:doi/10.5194/tc-14-3367-2020 uri/info:scp/85092639675 https://dipot.ulb.ac.be/dspace/bitstream/2013/313242/1/doi_296886.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/313242 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1797571902878777344 |