Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events
The millennial-scale asynchrony of Antarctic and Greenland climate records during the last glacial period implies that the global climate system acts as a bipolar see-saw driven by either high-latitudinal and/or near-equatorial sea-surface perturbations. Based on the results of recent modelling of g...
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2001
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ftucl:oai:eprints.ucl.ac.uk.OAI2:101366 2023-05-15T14:02:31+02:00 Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events Seidov, D Maslin, M 2001-05 http://discovery.ucl.ac.uk/101366/ unknown JOHN WILEY & SONS LTD J QUATERNARY SCI , 16 (4) 321 - 328. (2001) bipolar climate see-saw Heinrich events Dansgaard-Oeschger cycles hemispheric heat piracy deep-water circulation ocean circulation modelling LAST GLACIAL MAXIMUM GLOBAL THERMOHALINE CIRCULATION FRESH-WATER INPUT NORTH-ATLANTIC WORLD OCEAN YOUNGER-DRYAS MODEL ICE TRANSPORT SENSITIVITY Article 2001 ftucl 2016-01-15T02:34:48Z The millennial-scale asynchrony of Antarctic and Greenland climate records during the last glacial period implies that the global climate system acts as a bipolar see-saw driven by either high-latitudinal and/or near-equatorial sea-surface perturbations. Based on the results of recent modelling of generic Heinrich and Dansgaard-Oeschger scenarios, we discuss the possibility that oscillations of the deep-ocean conveyor may have been sufficient to cause this bipolar see-saw. The bipolar climate asynchrony in our scenarios is caused by the toggle between North Atlantic heat piracy and South Atlantic counter heat piracy. Ocean circulation has an enhanced sensitivity to the northern deep-water source as the North Atlantic Deep Water (NADW) cannot enter the Southern Ocean at depths shallower than the bottom of the Drake Passage. Any shoaling of the NADW can, therefore, increase the northward incursion of Antarctic Bottom Water (AABW), and trigger an interhemispheric climate oscillation. As hundreds of years are required to warm the respective high latitudes, the observed climate lead and lags between the two hemispheres can be explained entirely by the variability of the meridional overturning and by the corresponding change in the oceanic heat transport. Accordingly, it is entirely feasible for the global climate to work like a pendulum, which theoretically could be controlled by pushing at either of the deep-water sources. Our model scenarios suggest that it is entirely feasible for the bipolar climate see-saw to be controlled solely by variations in NADW formation. Copyright (C) 2001 John Wiley & Sons, Ltd. Article in Journal/Newspaper Antarc* Antarctic Dansgaard-Oeschger events Drake Passage Greenland NADW North Atlantic Deep Water North Atlantic Southern Ocean University College London: UCL Discovery Antarctic Drake Passage Greenland Southern Ocean |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
bipolar climate see-saw Heinrich events Dansgaard-Oeschger cycles hemispheric heat piracy deep-water circulation ocean circulation modelling LAST GLACIAL MAXIMUM GLOBAL THERMOHALINE CIRCULATION FRESH-WATER INPUT NORTH-ATLANTIC WORLD OCEAN YOUNGER-DRYAS MODEL ICE TRANSPORT SENSITIVITY |
spellingShingle |
bipolar climate see-saw Heinrich events Dansgaard-Oeschger cycles hemispheric heat piracy deep-water circulation ocean circulation modelling LAST GLACIAL MAXIMUM GLOBAL THERMOHALINE CIRCULATION FRESH-WATER INPUT NORTH-ATLANTIC WORLD OCEAN YOUNGER-DRYAS MODEL ICE TRANSPORT SENSITIVITY Seidov, D Maslin, M Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events |
topic_facet |
bipolar climate see-saw Heinrich events Dansgaard-Oeschger cycles hemispheric heat piracy deep-water circulation ocean circulation modelling LAST GLACIAL MAXIMUM GLOBAL THERMOHALINE CIRCULATION FRESH-WATER INPUT NORTH-ATLANTIC WORLD OCEAN YOUNGER-DRYAS MODEL ICE TRANSPORT SENSITIVITY |
description |
The millennial-scale asynchrony of Antarctic and Greenland climate records during the last glacial period implies that the global climate system acts as a bipolar see-saw driven by either high-latitudinal and/or near-equatorial sea-surface perturbations. Based on the results of recent modelling of generic Heinrich and Dansgaard-Oeschger scenarios, we discuss the possibility that oscillations of the deep-ocean conveyor may have been sufficient to cause this bipolar see-saw. The bipolar climate asynchrony in our scenarios is caused by the toggle between North Atlantic heat piracy and South Atlantic counter heat piracy. Ocean circulation has an enhanced sensitivity to the northern deep-water source as the North Atlantic Deep Water (NADW) cannot enter the Southern Ocean at depths shallower than the bottom of the Drake Passage. Any shoaling of the NADW can, therefore, increase the northward incursion of Antarctic Bottom Water (AABW), and trigger an interhemispheric climate oscillation. As hundreds of years are required to warm the respective high latitudes, the observed climate lead and lags between the two hemispheres can be explained entirely by the variability of the meridional overturning and by the corresponding change in the oceanic heat transport. Accordingly, it is entirely feasible for the global climate to work like a pendulum, which theoretically could be controlled by pushing at either of the deep-water sources. Our model scenarios suggest that it is entirely feasible for the bipolar climate see-saw to be controlled solely by variations in NADW formation. Copyright (C) 2001 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Seidov, D Maslin, M |
author_facet |
Seidov, D Maslin, M |
author_sort |
Seidov, D |
title |
Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events |
title_short |
Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events |
title_full |
Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events |
title_fullStr |
Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events |
title_full_unstemmed |
Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events |
title_sort |
atlantic ocean heat piracy and the bipolar climate see-saw during heinrich and dansgaard-oeschger events |
publisher |
JOHN WILEY & SONS LTD |
publishDate |
2001 |
url |
http://discovery.ucl.ac.uk/101366/ |
geographic |
Antarctic Drake Passage Greenland Southern Ocean |
geographic_facet |
Antarctic Drake Passage Greenland Southern Ocean |
genre |
Antarc* Antarctic Dansgaard-Oeschger events Drake Passage Greenland NADW North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Dansgaard-Oeschger events Drake Passage Greenland NADW North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
J QUATERNARY SCI , 16 (4) 321 - 328. (2001) |
_version_ |
1766272835093790720 |