Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds
The internal variability of the global meridional overturning circulation (GMOC) in long-term integration of a state-of-art coupled general circulation model is examined. Two distinct modes of the GMOC, which are closely linked to the Southern Hemisphere westerly winds (SWWs) anomalies, are found on...
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ftawi:oai:epic.awi.de:26035 2024-09-15T18:37:03+00:00 Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds Wei, Wei Lohmann, Gerrit Dima, Mihai 2011-06 https://epic.awi.de/id/eprint/26035/ https://hdl.handle.net/10013/epic.39060 unknown Wei, W. , Lohmann, G. orcid:0000-0003-2089-733X and Dima, M. (2011) Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds , 3rd International Workshop on Modeling the Ocean (IWMO-2011), Qingdao, CHINA, 6 June 2011 - 9 June 2011 . hdl:10013/epic.39060 EPIC33rd International Workshop on Modeling the Ocean (IWMO-2011), Qingdao, CHINA, 2011-06-06-2011-06-09 Conference notRev 2011 ftawi 2024-06-24T04:03:41Z The internal variability of the global meridional overturning circulation (GMOC) in long-term integration of a state-of-art coupled general circulation model is examined. Two distinct modes of the GMOC, which are closely linked to the Southern Hemisphere westerly winds (SWWs) anomalies, are found on multi-decadal and centennial time scales. The dominant mode is characterized by Southern Ocean dynamics: strengthening or poleward shifts of the SWWs yield Ekman-induced northward mass transport, including a zonally asymmetric response in the Southern Ocean sea surface temperature, and a cooling in the tropical Pacific Ocean due to large-scale upwelling. The second mode projects more on the Atlantic meridional overturning circulation (AMOC). It affects the high latitude northern hemisphere sea surface temperature. Our results from a mid-Holocene experiment imply that both modes are independent with the climate background conditions in the Holocene. Finally, we argue that the natural modes of GMOC are important to understand trends in ocean circulation with consequences for heat and carbon budgets for past, present and future climate. Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
The internal variability of the global meridional overturning circulation (GMOC) in long-term integration of a state-of-art coupled general circulation model is examined. Two distinct modes of the GMOC, which are closely linked to the Southern Hemisphere westerly winds (SWWs) anomalies, are found on multi-decadal and centennial time scales. The dominant mode is characterized by Southern Ocean dynamics: strengthening or poleward shifts of the SWWs yield Ekman-induced northward mass transport, including a zonally asymmetric response in the Southern Ocean sea surface temperature, and a cooling in the tropical Pacific Ocean due to large-scale upwelling. The second mode projects more on the Atlantic meridional overturning circulation (AMOC). It affects the high latitude northern hemisphere sea surface temperature. Our results from a mid-Holocene experiment imply that both modes are independent with the climate background conditions in the Holocene. Finally, we argue that the natural modes of GMOC are important to understand trends in ocean circulation with consequences for heat and carbon budgets for past, present and future climate. |
format |
Conference Object |
author |
Wei, Wei Lohmann, Gerrit Dima, Mihai |
spellingShingle |
Wei, Wei Lohmann, Gerrit Dima, Mihai Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds |
author_facet |
Wei, Wei Lohmann, Gerrit Dima, Mihai |
author_sort |
Wei, Wei |
title |
Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds |
title_short |
Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds |
title_full |
Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds |
title_fullStr |
Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds |
title_full_unstemmed |
Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds |
title_sort |
distinct modes of internal variability in the global meridional overturning circulation associated with the southern hemisphere westerly winds |
publishDate |
2011 |
url |
https://epic.awi.de/id/eprint/26035/ https://hdl.handle.net/10013/epic.39060 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC33rd International Workshop on Modeling the Ocean (IWMO-2011), Qingdao, CHINA, 2011-06-06-2011-06-09 |
op_relation |
Wei, W. , Lohmann, G. orcid:0000-0003-2089-733X and Dima, M. (2011) Distinct modes of internal variability in the Global Meridional Overturning Circulation associated with the Southern Hemisphere westerly winds , 3rd International Workshop on Modeling the Ocean (IWMO-2011), Qingdao, CHINA, 6 June 2011 - 9 June 2011 . hdl:10013/epic.39060 |
_version_ |
1810481308996993024 |