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 2000m of elevation from the dry cent...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20180006786 2023-05-15T13:37:20+02:00 Regional Antarctic Snow Accumulation Over the Past 1000 Years Frezzotti, Massimo van den Broeke, Michiel R Lenaerts, Jan Ekaykin, Alexey A. Stenni, Barbara Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Medley, Brooke C. Dixon, Daniel A. Fudge, Tj Curran, Mark Bertler, Nancy van Wessem, J. Melchior Vallelonga, Paul Thomas, Elizabeth R. Unclassified, Unlimited, Publicly available November 10, 2017 application/pdf http://hdl.handle.net/2060/20180006786 unknown Document ID: 20180006786 http://hdl.handle.net/2060/20180006786 Copyright, Use by or on behalf of the U.S. Government permitted CASI Meteorology and Climatology GSFC-E-DAA-TN49771 Climate of the Past (ISSN 1814-9324) (e-ISSN 1814-9332); 13; 11; 1491-1513 2017 ftnasantrs 2019-07-20T23:10:43Z 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 2000m 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 dec(exp -1) since 1800 AD, representing a net reduction in sea level of 0.02 mm dec(exp -1) since 1800 and 0.04 mm dec(exp -1) since 1900 AD. The largest contribution is from the Antarctic Peninsula (75%) where the annual average SMB during the most recent decade (2001-2010) is 123+/-44 Gt yr(exp -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. Other/Unknown Material Antarc* Antarctic Antarctic Peninsula ice core Ice Sheet Ice Shelves Weddell Sea NASA Technical Reports Server (NTRS) Antarctic Antarctic Peninsula The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Frezzotti, Massimo van den Broeke, Michiel R Lenaerts, Jan Ekaykin, Alexey A. Stenni, Barbara Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Medley, Brooke C. Dixon, Daniel A. Fudge, Tj Curran, Mark Bertler, Nancy van Wessem, J. Melchior Vallelonga, Paul Thomas, Elizabeth R. Regional Antarctic Snow Accumulation Over the Past 1000 Years |
topic_facet |
Meteorology and Climatology |
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 2000m 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 dec(exp -1) since 1800 AD, representing a net reduction in sea level of 0.02 mm dec(exp -1) since 1800 and 0.04 mm dec(exp -1) since 1900 AD. The largest contribution is from the Antarctic Peninsula (75%) where the annual average SMB during the most recent decade (2001-2010) is 123+/-44 Gt yr(exp -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. |
format |
Other/Unknown Material |
author |
Frezzotti, Massimo van den Broeke, Michiel R Lenaerts, Jan Ekaykin, Alexey A. Stenni, Barbara Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Medley, Brooke C. Dixon, Daniel A. Fudge, Tj Curran, Mark Bertler, Nancy van Wessem, J. Melchior Vallelonga, Paul Thomas, Elizabeth R. |
author_facet |
Frezzotti, Massimo van den Broeke, Michiel R Lenaerts, Jan Ekaykin, Alexey A. Stenni, Barbara Roberts, Jason Isaksson, Elisabeth Schlosser, Elisabeth Medley, Brooke C. Dixon, Daniel A. Fudge, Tj Curran, Mark Bertler, Nancy van Wessem, J. Melchior Vallelonga, Paul Thomas, Elizabeth R. |
author_sort |
Frezzotti, Massimo |
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/2060/20180006786 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic Antarctic Peninsula The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic Weddell Weddell Sea |
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_source |
CASI |
op_relation |
Document ID: 20180006786 http://hdl.handle.net/2060/20180006786 |
op_rights |
Copyright, Use by or on behalf of the U.S. Government permitted |
_version_ |
1766090572746981376 |