Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1
The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling, thought to have been initiated by North America fresh water runoff that caused a sustained reduction of North Atlantic Meridional Overturning Circulation (AMOC), resulting in an antiphase temperature re...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_1529077 2023-05-15T16:27:59+02:00 Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1 Hogg, A. Southon, J. Turney, C. Palmer, J. Bronk Ramsey, C. Fenwick, P. Boswijk, G. Friedrich, M. Helle, G. Hughen, K. Jones, R. Kromer, B. Noronha, A. Reynard, L. Staff, R. Wacker, L. 2016 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077_3/component/file_1529096/1529077.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1038/srep25902 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1038/srep25902 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077_3/component/file_1529096/1529077.pdf info:eu-repo/semantics/openAccess Scientific Reports info:eu-repo/semantics/article 2016 ftgfzpotsdam https://doi.org/10.1038/srep25902 2022-09-14T05:55:37Z The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling, thought to have been initiated by North America fresh water runoff that caused a sustained reduction of North Atlantic Meridional Overturning Circulation (AMOC), resulting in an antiphase temperature response between the hemispheres (the ‘bipolar seesaw’). Here we exploit sub-fossil New Zealand kauri trees to report the first securely dated, decadally-resolved atmospheric radiocarbon (14C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring 14C records with marine 14C sequences we document two relatively short periods of AMOC collapse during the stadial, at ~12,920-12,640 cal BP and 12,050-11,900 cal BP. In addition, our data show that the interhemispheric atmospheric 14C offset was close to zero prior to GS-1, before reaching ‘near-modern’ values at ~12,660 cal BP, consistent with synchronous recovery of overturning in both hemispheres and increased Southern Ocean ventilation. Hence, sustained North Atlantic cooling across GS-1 was not driven by a prolonged AMOC reduction but probably due to an equatorward migration of the Polar Front, reducing the advection of southwesterly air masses to high latitudes. Our findings suggest opposing hemispheric temperature trends were driven by atmospheric teleconnections, rather than AMOC changes. Article in Journal/Newspaper Greenland North Atlantic Southern Ocean GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Southern Ocean Greenland New Zealand Scientific Reports 6 1 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
The Greenland Stadial 1 (GS-1; ~12.9 to 11.65 kyr cal BP) was a period of North Atlantic cooling, thought to have been initiated by North America fresh water runoff that caused a sustained reduction of North Atlantic Meridional Overturning Circulation (AMOC), resulting in an antiphase temperature response between the hemispheres (the ‘bipolar seesaw’). Here we exploit sub-fossil New Zealand kauri trees to report the first securely dated, decadally-resolved atmospheric radiocarbon (14C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring 14C records with marine 14C sequences we document two relatively short periods of AMOC collapse during the stadial, at ~12,920-12,640 cal BP and 12,050-11,900 cal BP. In addition, our data show that the interhemispheric atmospheric 14C offset was close to zero prior to GS-1, before reaching ‘near-modern’ values at ~12,660 cal BP, consistent with synchronous recovery of overturning in both hemispheres and increased Southern Ocean ventilation. Hence, sustained North Atlantic cooling across GS-1 was not driven by a prolonged AMOC reduction but probably due to an equatorward migration of the Polar Front, reducing the advection of southwesterly air masses to high latitudes. Our findings suggest opposing hemispheric temperature trends were driven by atmospheric teleconnections, rather than AMOC changes. |
format |
Article in Journal/Newspaper |
author |
Hogg, A. Southon, J. Turney, C. Palmer, J. Bronk Ramsey, C. Fenwick, P. Boswijk, G. Friedrich, M. Helle, G. Hughen, K. Jones, R. Kromer, B. Noronha, A. Reynard, L. Staff, R. Wacker, L. |
spellingShingle |
Hogg, A. Southon, J. Turney, C. Palmer, J. Bronk Ramsey, C. Fenwick, P. Boswijk, G. Friedrich, M. Helle, G. Hughen, K. Jones, R. Kromer, B. Noronha, A. Reynard, L. Staff, R. Wacker, L. Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1 |
author_facet |
Hogg, A. Southon, J. Turney, C. Palmer, J. Bronk Ramsey, C. Fenwick, P. Boswijk, G. Friedrich, M. Helle, G. Hughen, K. Jones, R. Kromer, B. Noronha, A. Reynard, L. Staff, R. Wacker, L. |
author_sort |
Hogg, A. |
title |
Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1 |
title_short |
Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1 |
title_full |
Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1 |
title_fullStr |
Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1 |
title_full_unstemmed |
Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1 |
title_sort |
punctuated shutdown of atlantic meridional overturning circulation during greenland stadial 1 |
publishDate |
2016 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077_3/component/file_1529096/1529077.pdf |
geographic |
Southern Ocean Greenland New Zealand |
geographic_facet |
Southern Ocean Greenland New Zealand |
genre |
Greenland North Atlantic Southern Ocean |
genre_facet |
Greenland North Atlantic Southern Ocean |
op_source |
Scientific Reports |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/srep25902 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1038/srep25902 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529077_3/component/file_1529096/1529077.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/srep25902 |
container_title |
Scientific Reports |
container_volume |
6 |
container_issue |
1 |
_version_ |
1766017596546613248 |