Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation
During the last two deglaciations Southern Hemisphere warming preceded Greenland warming and the northern Atlantic has been exposed to meltwater discharge that is known to reduce North Atlantic deep water (NADW) formation. Yet, deglaciation is accompanied by a transition from a weak glacial to a str...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2003
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/11062/ https://epic.awi.de/id/eprint/11062/1/Kno2003a.pdf https://hdl.handle.net/10013/epic.21522 https://hdl.handle.net/10013/epic.21522.d001 |
id |
ftawi:oai:epic.awi.de:11062 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:11062 2023-09-05T13:19:52+02:00 Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation Knorr, Gregor Lohmann, Gerrit 2003 application/pdf https://epic.awi.de/id/eprint/11062/ https://epic.awi.de/id/eprint/11062/1/Kno2003a.pdf https://hdl.handle.net/10013/epic.21522 https://hdl.handle.net/10013/epic.21522.d001 unknown https://epic.awi.de/id/eprint/11062/1/Kno2003a.pdf https://hdl.handle.net/10013/epic.21522.d001 Knorr, G. orcid:0000-0002-8317-5046 and Lohmann, G. orcid:0000-0003-2089-733X (2003) Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation , Nature, 424 , pp. 532-536 . hdl:10013/epic.21522 EPIC3Nature, 424, pp. 532-536 Article isiRev 2003 ftawi 2023-08-22T19:49:05Z During the last two deglaciations Southern Hemisphere warming preceded Greenland warming and the northern Atlantic has been exposed to meltwater discharge that is known to reduce North Atlantic deep water (NADW) formation. Yet, deglaciation is accompanied by a transition from a weak glacial to a strong interglacial Atlantic thermohaline circulation (THC). Here we utilize a three-dimensional ocean circulation model to investigate the impact of Southern Ocean warming and associated sea ice retreat onto the Atlantic THC. We show that gradual warming in the Southern Ocean induces an abrupt resumption of interglacial Atlantic THC by increased mass transport via the warm and cold water route of the global oceanic conveyor belt circulation. This effect prevails over the destabilizing effect of deglacial meltwater input to the northern Atlantic. The mechanism provides a consistent picture of Southern and Northern Hemisphere climate change in agreement with proxy records during deglaciation. Article in Journal/Newspaper Greenland NADW North Atlantic Deep Water North Atlantic Sea ice Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland Southern Ocean |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
During the last two deglaciations Southern Hemisphere warming preceded Greenland warming and the northern Atlantic has been exposed to meltwater discharge that is known to reduce North Atlantic deep water (NADW) formation. Yet, deglaciation is accompanied by a transition from a weak glacial to a strong interglacial Atlantic thermohaline circulation (THC). Here we utilize a three-dimensional ocean circulation model to investigate the impact of Southern Ocean warming and associated sea ice retreat onto the Atlantic THC. We show that gradual warming in the Southern Ocean induces an abrupt resumption of interglacial Atlantic THC by increased mass transport via the warm and cold water route of the global oceanic conveyor belt circulation. This effect prevails over the destabilizing effect of deglacial meltwater input to the northern Atlantic. The mechanism provides a consistent picture of Southern and Northern Hemisphere climate change in agreement with proxy records during deglaciation. |
format |
Article in Journal/Newspaper |
author |
Knorr, Gregor Lohmann, Gerrit |
spellingShingle |
Knorr, Gregor Lohmann, Gerrit Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation |
author_facet |
Knorr, Gregor Lohmann, Gerrit |
author_sort |
Knorr, Gregor |
title |
Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation |
title_short |
Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation |
title_full |
Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation |
title_fullStr |
Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation |
title_full_unstemmed |
Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation |
title_sort |
southern ocean origin for resumption of atlantic thermohalilne circulation during deglaciation |
publishDate |
2003 |
url |
https://epic.awi.de/id/eprint/11062/ https://epic.awi.de/id/eprint/11062/1/Kno2003a.pdf https://hdl.handle.net/10013/epic.21522 https://hdl.handle.net/10013/epic.21522.d001 |
geographic |
Greenland Southern Ocean |
geographic_facet |
Greenland Southern Ocean |
genre |
Greenland NADW North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
genre_facet |
Greenland NADW North Atlantic Deep Water North Atlantic Sea ice Southern Ocean |
op_source |
EPIC3Nature, 424, pp. 532-536 |
op_relation |
https://epic.awi.de/id/eprint/11062/1/Kno2003a.pdf https://hdl.handle.net/10013/epic.21522.d001 Knorr, G. orcid:0000-0002-8317-5046 and Lohmann, G. orcid:0000-0003-2089-733X (2003) Southern Ocean Origin for Resumption of Atlantic Thermohalilne Circulation during Deglaciation , Nature, 424 , pp. 532-536 . hdl:10013/epic.21522 |
_version_ |
1776200664516395008 |