Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate
We use a coupled climate model to evaluate ocean bottom pressure changes in the IPCC-A1B climate scenario. Ocean warming in the 21st and 22nd centuries causes secular oceanic bottom pressure anomalies. The essential feature is a net mass transfer onto shallow shelf areas from the deeper ocean areas,...
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ftpubman:oai:pure.mpg.de:item_994362 2023-08-27T04:07:55+02:00 Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate Landerer, F. Jungclaus, J. Marotzke, J. 2007-03 application/pdf http://hdl.handle.net/11858/00-001M-0000-0011-FB24-9 http://hdl.handle.net/11858/00-001M-0000-0011-FB23-B eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GL029106 http://hdl.handle.net/11858/00-001M-0000-0011-FB24-9 http://hdl.handle.net/11858/00-001M-0000-0011-FB23-B info:eu-repo/semantics/openAccess Geophysical Research Letters info:eu-repo/semantics/article 2007 ftpubman https://doi.org/10.1029/2006GL029106 2023-08-02T01:34:38Z We use a coupled climate model to evaluate ocean bottom pressure changes in the IPCC-A1B climate scenario. Ocean warming in the 21st and 22nd centuries causes secular oceanic bottom pressure anomalies. The essential feature is a net mass transfer onto shallow shelf areas from the deeper ocean areas, which exhibit negative bottom pressure anomalies. We develop a simple mass redistribution model that explains this mechanism. Regionally, however, distinct patterns of bottom pressure anomalies emerge due to spatially inhomogeneous warming and ocean circulation changes. Most prominently, the Arctic Ocean shelves experience an above-average bottom pressure increase. We find a net transfer of mass from the Southern to the Northern Hemisphere, and a net movement of mass closer towards Earth's axis of rotation. Thus, ocean warming and the ensuing mass redistribution change the length-of-day by -0.12 ms within 200 years, demonstrating that the oceans are capable of exciting nontidal length-of-day changes on decadal and longer timescales. Article in Journal/Newspaper Arctic Arctic Ocean Max Planck Society: MPG.PuRe Arctic Arctic Ocean Geophysical Research Letters 34 6 |
institution |
Open Polar |
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Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
We use a coupled climate model to evaluate ocean bottom pressure changes in the IPCC-A1B climate scenario. Ocean warming in the 21st and 22nd centuries causes secular oceanic bottom pressure anomalies. The essential feature is a net mass transfer onto shallow shelf areas from the deeper ocean areas, which exhibit negative bottom pressure anomalies. We develop a simple mass redistribution model that explains this mechanism. Regionally, however, distinct patterns of bottom pressure anomalies emerge due to spatially inhomogeneous warming and ocean circulation changes. Most prominently, the Arctic Ocean shelves experience an above-average bottom pressure increase. We find a net transfer of mass from the Southern to the Northern Hemisphere, and a net movement of mass closer towards Earth's axis of rotation. Thus, ocean warming and the ensuing mass redistribution change the length-of-day by -0.12 ms within 200 years, demonstrating that the oceans are capable of exciting nontidal length-of-day changes on decadal and longer timescales. |
format |
Article in Journal/Newspaper |
author |
Landerer, F. Jungclaus, J. Marotzke, J. |
spellingShingle |
Landerer, F. Jungclaus, J. Marotzke, J. Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate |
author_facet |
Landerer, F. Jungclaus, J. Marotzke, J. |
author_sort |
Landerer, F. |
title |
Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate |
title_short |
Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate |
title_full |
Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate |
title_fullStr |
Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate |
title_full_unstemmed |
Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate |
title_sort |
ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate |
publishDate |
2007 |
url |
http://hdl.handle.net/11858/00-001M-0000-0011-FB24-9 http://hdl.handle.net/11858/00-001M-0000-0011-FB23-B |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Geophysical Research Letters |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GL029106 http://hdl.handle.net/11858/00-001M-0000-0011-FB24-9 http://hdl.handle.net/11858/00-001M-0000-0011-FB23-B |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2006GL029106 |
container_title |
Geophysical Research Letters |
container_volume |
34 |
container_issue |
6 |
_version_ |
1775348638959009792 |