Regional Antarctic snow accumulation over the past 1000 years
Here we present Antarctic snow accumulation variability at the regional scale over the past 1000 years. A total of 79 ice core snow accumulation records were gathered and assigned to seven geographical regions, separating the high-accumulation coastal zones below 2000 m of elevation from the dry cen...
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ftuniveneziairis:oai:iris.unive.it:10278/3694428 2024-04-14T08:03:13+00:00 Regional Antarctic snow accumulation over the past 1000 years Thomas, Elizabeth R. Melchior Van Wessem, J. Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Fudge, Tyler J. Vallelonga, Paul Medley, Brooke Lenaerts, Jan Bertler, Nancy Van Den Broeke, Michiel R. Dixon, Daniel A. Frezzotti, Massimo Stenni, Barbara Curran, Mark Ekaykin, Alexey A. Thomas, Elizabeth R. Melchior Van Wessem, J. Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Fudge, Tyler J. Vallelonga, Paul Medley, Brooke Lenaerts, Jan Bertler, Nancy Van Den Broeke, Michiel R. Dixon, Daniel A. Frezzotti, Massimo Stenni, Barbara Curran, Mark Ekaykin, Alexey A. 2017 http://hdl.handle.net/10278/3694428 https://doi.org/10.5194/cp-13-1491-2017 http://www.clim-past.net/volumes_and_issues.html eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000414951400001 volume:13 issue:11 firstpage:1491 lastpage:1513 numberofpages:23 journal:CLIMATE OF THE PAST http://hdl.handle.net/10278/3694428 doi:10.5194/cp-13-1491-2017 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85034071860 http://www.clim-past.net/volumes_and_issues.html info:eu-repo/semantics/openAccess Global and Planetary Change Stratigraphy Paleontology Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/article 2017 ftuniveneziairis https://doi.org/10.5194/cp-13-1491-2017 2024-03-21T18:06:12Z Here we present Antarctic snow accumulation variability at the regional scale over the past 1000 years. A total of 79 ice core snow accumulation records were gathered and assigned to seven geographical regions, separating the high-accumulation coastal zones below 2000 m of elevation from the dry central Antarctic Plateau. The regional composites of annual snow accumulation were evaluated against modelled surface mass balance (SMB) from RACMO2.3p2 and precipitation from ERA-Interim reanalysis. With the exception of the Weddell Sea coast, the low-elevation composites capture the regional precipitation and SMB variability as defined by the models. The central Antarctic sites lack coherency and either do not represent regional precipitation or indicate the model inability to capture relevant precipitation processes in the cold, dry central plateau. Our results show that SMB for the total Antarctic Ice Sheet (including ice shelves) has increased at a rate of 7 ± 0.13 Gt decadeg 1 since 1800 AD, representing a net reduction in sea level of âˆ1⁄4 0.02 mm decadeg 1 since 1800 and âˆ1⁄4 0.04 mm decadeg 1 since 1900 AD. The largest contribution is from the Antarctic Peninsula (âˆ1⁄4 75 %) where the annual average SMB during the most recent decade (2001-2010) is 123 ± 44 Gt yrg 1 higher than the annual average during the first decade of the 19th century. Only four ice core records cover the full 1000 years, and they suggest a decrease in snow accumulation during this period. However, our study emphasizes the importance of low-elevation coastal zones, which have been under-represented in previous investigations of temporal snow accumulation. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula ice core Ice Sheet Ice Shelves Weddell Sea Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic The Antarctic Antarctic Peninsula Weddell Sea Weddell Climate of the Past 13 11 1491 1513 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Global and Planetary Change Stratigraphy Paleontology Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Global and Planetary Change Stratigraphy Paleontology Settore GEO/08 - Geochimica e Vulcanologia Thomas, Elizabeth R. Melchior Van Wessem, J. Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Fudge, Tyler J. Vallelonga, Paul Medley, Brooke Lenaerts, Jan Bertler, Nancy Van Den Broeke, Michiel R. Dixon, Daniel A. Frezzotti, Massimo Stenni, Barbara Curran, Mark Ekaykin, Alexey A. Regional Antarctic snow accumulation over the past 1000 years |
topic_facet |
Global and Planetary Change Stratigraphy Paleontology Settore GEO/08 - Geochimica e Vulcanologia |
description |
Here we present Antarctic snow accumulation variability at the regional scale over the past 1000 years. A total of 79 ice core snow accumulation records were gathered and assigned to seven geographical regions, separating the high-accumulation coastal zones below 2000 m of elevation from the dry central Antarctic Plateau. The regional composites of annual snow accumulation were evaluated against modelled surface mass balance (SMB) from RACMO2.3p2 and precipitation from ERA-Interim reanalysis. With the exception of the Weddell Sea coast, the low-elevation composites capture the regional precipitation and SMB variability as defined by the models. The central Antarctic sites lack coherency and either do not represent regional precipitation or indicate the model inability to capture relevant precipitation processes in the cold, dry central plateau. Our results show that SMB for the total Antarctic Ice Sheet (including ice shelves) has increased at a rate of 7 ± 0.13 Gt decadeg 1 since 1800 AD, representing a net reduction in sea level of âˆ1⁄4 0.02 mm decadeg 1 since 1800 and âˆ1⁄4 0.04 mm decadeg 1 since 1900 AD. The largest contribution is from the Antarctic Peninsula (âˆ1⁄4 75 %) where the annual average SMB during the most recent decade (2001-2010) is 123 ± 44 Gt yrg 1 higher than the annual average during the first decade of the 19th century. Only four ice core records cover the full 1000 years, and they suggest a decrease in snow accumulation during this period. However, our study emphasizes the importance of low-elevation coastal zones, which have been under-represented in previous investigations of temporal snow accumulation. |
author2 |
Thomas, Elizabeth R. Melchior Van Wessem, J. Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Fudge, Tyler J. Vallelonga, Paul Medley, Brooke Lenaerts, Jan Bertler, Nancy Van Den Broeke, Michiel R. Dixon, Daniel A. Frezzotti, Massimo Stenni, Barbara Curran, Mark Ekaykin, Alexey A. |
format |
Article in Journal/Newspaper |
author |
Thomas, Elizabeth R. Melchior Van Wessem, J. Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Fudge, Tyler J. Vallelonga, Paul Medley, Brooke Lenaerts, Jan Bertler, Nancy Van Den Broeke, Michiel R. Dixon, Daniel A. Frezzotti, Massimo Stenni, Barbara Curran, Mark Ekaykin, Alexey A. |
author_facet |
Thomas, Elizabeth R. Melchior Van Wessem, J. Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Fudge, Tyler J. Vallelonga, Paul Medley, Brooke Lenaerts, Jan Bertler, Nancy Van Den Broeke, Michiel R. Dixon, Daniel A. Frezzotti, Massimo Stenni, Barbara Curran, Mark Ekaykin, Alexey A. |
author_sort |
Thomas, Elizabeth R. |
title |
Regional Antarctic snow accumulation over the past 1000 years |
title_short |
Regional Antarctic snow accumulation over the past 1000 years |
title_full |
Regional Antarctic snow accumulation over the past 1000 years |
title_fullStr |
Regional Antarctic snow accumulation over the past 1000 years |
title_full_unstemmed |
Regional Antarctic snow accumulation over the past 1000 years |
title_sort |
regional antarctic snow accumulation over the past 1000 years |
publishDate |
2017 |
url |
http://hdl.handle.net/10278/3694428 https://doi.org/10.5194/cp-13-1491-2017 http://www.clim-past.net/volumes_and_issues.html |
geographic |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea Weddell |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula ice core Ice Sheet Ice Shelves Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula ice core Ice Sheet Ice Shelves Weddell Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000414951400001 volume:13 issue:11 firstpage:1491 lastpage:1513 numberofpages:23 journal:CLIMATE OF THE PAST http://hdl.handle.net/10278/3694428 doi:10.5194/cp-13-1491-2017 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85034071860 http://www.clim-past.net/volumes_and_issues.html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-13-1491-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
11 |
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1491 |
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1796299470343766016 |