A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change
Iceberg calving is a major component of the total mass balance of the Greenland ice sheet (GrIS). A century-long record of Greenland icebergs comes from the International Ice Patrol's record of icebergs (I48N) passing latitude 48° N, off Newfoundland. I48N exhibits strong interannual variabilit...
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ftpubmed:oai:pubmedcentral.nih.gov:4042714 2023-05-15T16:26:16+02:00 A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change Bigg, G. R. Wei, H. L. Wilton, D. J. Zhao, Y. Billings, S. A. Hanna, E. Kadirkamanathan, V. 2014-06-08 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4042714 http://www.ncbi.nlm.nih.gov/pubmed/24910517 https://doi.org/10.1098/rspa.2013.0662 en eng The Royal Society Publishing http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/24910517 http://dx.doi.org/10.1098/rspa.2013.0662 http://creativecommons.org/licenses/by/3.0/ © 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited. CC-BY Research Articles Text 2014 ftpubmed https://doi.org/10.1098/rspa.2013.0662 2014-06-15T00:40:00Z Iceberg calving is a major component of the total mass balance of the Greenland ice sheet (GrIS). A century-long record of Greenland icebergs comes from the International Ice Patrol's record of icebergs (I48N) passing latitude 48° N, off Newfoundland. I48N exhibits strong interannual variability, with a significant increase in amplitude over recent decades. In this study, we show, through a combination of nonlinear system identification and coupled ocean–iceberg modelling, that I48N's variability is predominantly caused by fluctuation in GrIS calving discharge rather than open ocean iceberg melting. We also demonstrate that the episodic variation in iceberg discharge is strongly linked to a nonlinear combination of recent changes in the surface mass balance (SMB) of the GrIS and regional atmospheric and oceanic climate variability, on the scale of the previous 1–3 years, with the dominant causal mechanism shifting between glaciological (SMB) and climatic (ocean temperature) over time. We suggest that this is a change in whether glacial run-off or under-ice melting is dominant, respectively. We also suggest that GrIS calving discharge is episodic on at least a regional scale and has recently been increasing significantly, largely as a result of west Greenland sources. Text Greenland Ice Sheet Newfoundland PubMed Central (PMC) Greenland Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470 2166 20130662 |
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Research Articles |
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Research Articles Bigg, G. R. Wei, H. L. Wilton, D. J. Zhao, Y. Billings, S. A. Hanna, E. Kadirkamanathan, V. A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change |
topic_facet |
Research Articles |
description |
Iceberg calving is a major component of the total mass balance of the Greenland ice sheet (GrIS). A century-long record of Greenland icebergs comes from the International Ice Patrol's record of icebergs (I48N) passing latitude 48° N, off Newfoundland. I48N exhibits strong interannual variability, with a significant increase in amplitude over recent decades. In this study, we show, through a combination of nonlinear system identification and coupled ocean–iceberg modelling, that I48N's variability is predominantly caused by fluctuation in GrIS calving discharge rather than open ocean iceberg melting. We also demonstrate that the episodic variation in iceberg discharge is strongly linked to a nonlinear combination of recent changes in the surface mass balance (SMB) of the GrIS and regional atmospheric and oceanic climate variability, on the scale of the previous 1–3 years, with the dominant causal mechanism shifting between glaciological (SMB) and climatic (ocean temperature) over time. We suggest that this is a change in whether glacial run-off or under-ice melting is dominant, respectively. We also suggest that GrIS calving discharge is episodic on at least a regional scale and has recently been increasing significantly, largely as a result of west Greenland sources. |
format |
Text |
author |
Bigg, G. R. Wei, H. L. Wilton, D. J. Zhao, Y. Billings, S. A. Hanna, E. Kadirkamanathan, V. |
author_facet |
Bigg, G. R. Wei, H. L. Wilton, D. J. Zhao, Y. Billings, S. A. Hanna, E. Kadirkamanathan, V. |
author_sort |
Bigg, G. R. |
title |
A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change |
title_short |
A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change |
title_full |
A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change |
title_fullStr |
A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change |
title_full_unstemmed |
A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change |
title_sort |
century of variation in the dependence of greenland iceberg calving on ice sheet surface mass balance and regional climate change |
publisher |
The Royal Society Publishing |
publishDate |
2014 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4042714 http://www.ncbi.nlm.nih.gov/pubmed/24910517 https://doi.org/10.1098/rspa.2013.0662 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Newfoundland |
genre_facet |
Greenland Ice Sheet Newfoundland |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/24910517 http://dx.doi.org/10.1098/rspa.2013.0662 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ © 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1098/rspa.2013.0662 |
container_title |
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
470 |
container_issue |
2166 |
container_start_page |
20130662 |
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1766015170944958464 |