Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009)
Ice core data are combined with RACMO2 regional climate model (RCM) output (1958-2010) to develop a reconstruction of the Greenland ice sheet net snow accumulation rate (Ât(G)) spanning years 1600-2009. Regression parameters from RCM output regressed on 86 ice cores are used with available cores in...
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ftunivwollongong:oai:ro.uow.edu.au:eispapers-2091 2023-05-15T16:27:35+02:00 Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009) Box, Jason E Cressie, Noel Bromwich, David H Jung, Ji-Hoon Van Den Broeke, Michiel Van Angelen, J H Forster, Richard R Miege, Clement Mosley-Thompson, Ellen Vinther, Bo McConnell, Joseph R 2013-01-01T08:00:00Z application/pdf https://ro.uow.edu.au/eispapers/1082 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2091&context=eispapers unknown Research Online https://ro.uow.edu.au/eispapers/1082 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2091&context=eispapers Faculty of Engineering and Information Sciences - Papers: Part A greenland accumulation snow net i part reconstruction balance 1600 mass 2009 sheet ice Engineering Science and Technology Studies article 2013 ftunivwollongong 2020-02-25T10:31:00Z Ice core data are combined with RACMO2 regional climate model (RCM) output (1958-2010) to develop a reconstruction of the Greenland ice sheet net snow accumulation rate (Ât(G)) spanning years 1600-2009. Regression parameters from RCM output regressed on 86 ice cores are used with available cores in a given year resulting in the reconstructed values. Each core site’s residual variance is used to inversely weight the cores’ respective contributions. The interannual amplitude of the reconstructed accumulation rate is damped by the regressions and is thus calibrated to match that of the RCM data. Uncertainty and significance of changes is measured using statistical models. We find a 12% or 86 Gt y-1 increase in ice sheet accumulation rate from the end of the Little Ice Age in ~1840 to the last decade of the reconstruction. This 1840-1996 trend is 30% higher than that of 1600-2009, suggesting an accelerating accumulation rate. The correlation of Ât(G) with the average surface air temperature in the Northern Hemisphere(SATNHt) remains positive through time, while the correlation of Ât(G) with local near-surface air temperatures or North Atlantic sea surface temperatures is inconsistent, suggesting a hemispheric-scale climate connection. We find an annual sensitivity of Ât(G) to SATNHt of 6.8% K-1 or 51 Gt K-1. The reconstuction, Ât(G), correlates consistently highly with the North Atlantic Oscillation index. Yet, at the 11-year time scale, the sign of this correlation flips four times in the 1870-2005 period. Article in Journal/Newspaper Greenland ice core Ice Sheet North Atlantic North Atlantic oscillation University of Wollongong, Australia: Research Online Greenland |
institution |
Open Polar |
collection |
University of Wollongong, Australia: Research Online |
op_collection_id |
ftunivwollongong |
language |
unknown |
topic |
greenland accumulation snow net i part reconstruction balance 1600 mass 2009 sheet ice Engineering Science and Technology Studies |
spellingShingle |
greenland accumulation snow net i part reconstruction balance 1600 mass 2009 sheet ice Engineering Science and Technology Studies Box, Jason E Cressie, Noel Bromwich, David H Jung, Ji-Hoon Van Den Broeke, Michiel Van Angelen, J H Forster, Richard R Miege, Clement Mosley-Thompson, Ellen Vinther, Bo McConnell, Joseph R Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009) |
topic_facet |
greenland accumulation snow net i part reconstruction balance 1600 mass 2009 sheet ice Engineering Science and Technology Studies |
description |
Ice core data are combined with RACMO2 regional climate model (RCM) output (1958-2010) to develop a reconstruction of the Greenland ice sheet net snow accumulation rate (Ât(G)) spanning years 1600-2009. Regression parameters from RCM output regressed on 86 ice cores are used with available cores in a given year resulting in the reconstructed values. Each core site’s residual variance is used to inversely weight the cores’ respective contributions. The interannual amplitude of the reconstructed accumulation rate is damped by the regressions and is thus calibrated to match that of the RCM data. Uncertainty and significance of changes is measured using statistical models. We find a 12% or 86 Gt y-1 increase in ice sheet accumulation rate from the end of the Little Ice Age in ~1840 to the last decade of the reconstruction. This 1840-1996 trend is 30% higher than that of 1600-2009, suggesting an accelerating accumulation rate. The correlation of Ât(G) with the average surface air temperature in the Northern Hemisphere(SATNHt) remains positive through time, while the correlation of Ât(G) with local near-surface air temperatures or North Atlantic sea surface temperatures is inconsistent, suggesting a hemispheric-scale climate connection. We find an annual sensitivity of Ât(G) to SATNHt of 6.8% K-1 or 51 Gt K-1. The reconstuction, Ât(G), correlates consistently highly with the North Atlantic Oscillation index. Yet, at the 11-year time scale, the sign of this correlation flips four times in the 1870-2005 period. |
format |
Article in Journal/Newspaper |
author |
Box, Jason E Cressie, Noel Bromwich, David H Jung, Ji-Hoon Van Den Broeke, Michiel Van Angelen, J H Forster, Richard R Miege, Clement Mosley-Thompson, Ellen Vinther, Bo McConnell, Joseph R |
author_facet |
Box, Jason E Cressie, Noel Bromwich, David H Jung, Ji-Hoon Van Den Broeke, Michiel Van Angelen, J H Forster, Richard R Miege, Clement Mosley-Thompson, Ellen Vinther, Bo McConnell, Joseph R |
author_sort |
Box, Jason E |
title |
Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009) |
title_short |
Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009) |
title_full |
Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009) |
title_fullStr |
Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009) |
title_full_unstemmed |
Greenland ice sheet mass balance reconstruction. Part I: net snow accumulation (1600-2009) |
title_sort |
greenland ice sheet mass balance reconstruction. part i: net snow accumulation (1600-2009) |
publisher |
Research Online |
publishDate |
2013 |
url |
https://ro.uow.edu.au/eispapers/1082 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2091&context=eispapers |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet North Atlantic North Atlantic oscillation |
genre_facet |
Greenland ice core Ice Sheet North Atlantic North Atlantic oscillation |
op_source |
Faculty of Engineering and Information Sciences - Papers: Part A |
op_relation |
https://ro.uow.edu.au/eispapers/1082 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2091&context=eispapers |
_version_ |
1766016976517332992 |