Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking
Fram Strait sea ice export from the Arctic represents a key source of fresh water for the North Atlantic. Although it may have strong influence on the ocean circulation, its causes and consequences are not yet fully understood. Using a global ocean-sea ice model with an increased resolution over the...
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ftawi:oai:epic.awi.de:43354 2024-09-15T18:07:00+00:00 Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking Scholz, Patrick Ionita, Monica Lohmann, Gerrit Dima, Mihai Prange, Matthias 2015 application/pdf https://epic.awi.de/id/eprint/43354/ https://epic.awi.de/id/eprint/43354/1/egu_2015_pscholz_v6.pdf https://hdl.handle.net/10013/epic.49917 https://hdl.handle.net/10013/epic.49917.d001 unknown https://epic.awi.de/id/eprint/43354/1/egu_2015_pscholz_v6.pdf https://hdl.handle.net/10013/epic.49917.d001 Scholz, P. orcid:0000-0003-2692-7624 , Ionita, M. orcid:0000-0001-8240-4380 , Lohmann, G. orcid:0000-0003-2089-733X , Dima, M. and Prange, M. (2015) Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking , EGU General Assembly, Vienna, Austria, 12 April 2015 - 17 April 2015 . hdl:10013/epic.49917 EPIC3EGU General Assembly, Vienna, Austria, 2015-04-12-2015-04-17 Conference notRev 2015 ftawi 2024-06-24T04:16:35Z Fram Strait sea ice export from the Arctic represents a key source of fresh water for the North Atlantic. Although it may have strong influence on the ocean circulation, its causes and consequences are not yet fully understood. Using a global ocean-sea ice model with an increased resolution over the Arctic, here it is shown that enhanced blocking activity over Greenland during the 1962-1966 period favors sea ice accumulation in the Arctic, whereas during the 1967-1971 period, when this blocking configuration is weak, the associated intense sea ice export trough Fram Strait reduces the Labrador Sea salinity and weakens the AMOC. These results indicate that AMOC shifts toward weak states, as the one emphasized here in the 1970s, may be induced by rapid sea ice flushes from the Arctic, after periods of enhanced blocking activity over Greenland. They imply also that an important part of the atmosphere-ocean dynamics at mid- and high latitudes requires a proper representation of the Fram Strait and associated sea ice transport as well as synoptic scale variability such as atmospheric blocking, which is a challenge for current coupled climate models. Conference Object Fram Strait Greenland Labrador Sea North Atlantic Sea ice 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 |
unknown |
description |
Fram Strait sea ice export from the Arctic represents a key source of fresh water for the North Atlantic. Although it may have strong influence on the ocean circulation, its causes and consequences are not yet fully understood. Using a global ocean-sea ice model with an increased resolution over the Arctic, here it is shown that enhanced blocking activity over Greenland during the 1962-1966 period favors sea ice accumulation in the Arctic, whereas during the 1967-1971 period, when this blocking configuration is weak, the associated intense sea ice export trough Fram Strait reduces the Labrador Sea salinity and weakens the AMOC. These results indicate that AMOC shifts toward weak states, as the one emphasized here in the 1970s, may be induced by rapid sea ice flushes from the Arctic, after periods of enhanced blocking activity over Greenland. They imply also that an important part of the atmosphere-ocean dynamics at mid- and high latitudes requires a proper representation of the Fram Strait and associated sea ice transport as well as synoptic scale variability such as atmospheric blocking, which is a challenge for current coupled climate models. |
format |
Conference Object |
author |
Scholz, Patrick Ionita, Monica Lohmann, Gerrit Dima, Mihai Prange, Matthias |
spellingShingle |
Scholz, Patrick Ionita, Monica Lohmann, Gerrit Dima, Mihai Prange, Matthias Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking |
author_facet |
Scholz, Patrick Ionita, Monica Lohmann, Gerrit Dima, Mihai Prange, Matthias |
author_sort |
Scholz, Patrick |
title |
Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking |
title_short |
Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking |
title_full |
Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking |
title_fullStr |
Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking |
title_full_unstemmed |
Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking |
title_sort |
abrupt shift of the atlantic ocean circulation induced by atmospheric blocking |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/43354/ https://epic.awi.de/id/eprint/43354/1/egu_2015_pscholz_v6.pdf https://hdl.handle.net/10013/epic.49917 https://hdl.handle.net/10013/epic.49917.d001 |
genre |
Fram Strait Greenland Labrador Sea North Atlantic Sea ice |
genre_facet |
Fram Strait Greenland Labrador Sea North Atlantic Sea ice |
op_source |
EPIC3EGU General Assembly, Vienna, Austria, 2015-04-12-2015-04-17 |
op_relation |
https://epic.awi.de/id/eprint/43354/1/egu_2015_pscholz_v6.pdf https://hdl.handle.net/10013/epic.49917.d001 Scholz, P. orcid:0000-0003-2692-7624 , Ionita, M. orcid:0000-0001-8240-4380 , Lohmann, G. orcid:0000-0003-2089-733X , Dima, M. and Prange, M. (2015) Abrupt shift of the Atlantic Ocean circulation induced by atmospheric blocking , EGU General Assembly, Vienna, Austria, 12 April 2015 - 17 April 2015 . hdl:10013/epic.49917 |
_version_ |
1810444357741838336 |