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

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

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Publisher:: NATURE PUBLISHING GROUP
Publication Type:: Journal Article
Citation:: Sci Rep, 2016, 6, (1), pp. 25902
Issue Date:: 2016-05-19

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Field	Value	Language
dc.contributor.author	Hogg, A
dc.contributor.author	Southon, J
dc.contributor.author	Turney, C https://orcid.org/0000-0001-6733-0993
dc.contributor.author	Palmer, J
dc.contributor.author	Bronk Ramsey, C
dc.contributor.author	Fenwick, P
dc.contributor.author	Boswijk, G
dc.contributor.author	Friedrich, M
dc.contributor.author	Helle, G
dc.contributor.author	Hughen, K
dc.contributor.author	Jones, R
dc.contributor.author	Kromer, B
dc.contributor.author	Noronha, A
dc.contributor.author	Reynard, L
dc.contributor.author	Staff, R
dc.contributor.author	Wacker, L
dc.date.accessioned	2022-08-16T06:20:59Z
dc.date.available	2016-04-21
dc.date.available	2022-08-16T06:20:59Z
dc.date.issued	2016-05-19
dc.identifier.citation	Sci Rep, 2016, 6, (1), pp. 25902
dc.identifier.issn	2045-2322
dc.identifier.issn	2045-2322
dc.identifier.uri	http://hdl.handle.net/10453/160349
dc.description.abstract	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 ((14)C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring (14)C records with marine (14)C 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 (14)C 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.
dc.format	Electronic
dc.language	eng
dc.publisher	NATURE PUBLISHING GROUP
dc.relation	http://purl.org/au-research/grants/arc/FL100100195
dc.relation	http://purl.org/au-research/grants/arc/DP0664898
dc.relation	Natural Environment Research CouncilNE/I007660/1
dc.relation.ispartof	Sci Rep
dc.relation.isbasedon	10.1038/srep25902
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Punctuated Shutdown of Atlantic Meridional Overturning Circulation during Greenland Stadial 1.
dc.type	Journal Article
utslib.citation.volume	6
utslib.location.activity	England
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Research)
utslib.copyright.status	open_access	*
dc.date.updated	2022-08-16T06:20:58Z
pubs.issue	1
pubs.publication-status	Published online
pubs.volume	6
utslib.citation.issue	1

Abstract:

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 ((14)C) record spanning GS-1. By precisely aligning Southern and Northern Hemisphere tree-ring (14)C records with marine (14)C 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 (14)C 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.

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http://hdl.handle.net/10453/160349