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Marine proxy evidence linking decadal North Pacific and Atlantic climate

Marine proxy evidence linking decadal North Pacific and Atlantic climate
Marine proxy evidence linking decadal North Pacific and Atlantic climate
Decadal- to multidecadal variability in the extra-tropical North Pacific is evident in 20th century instrumental records and has significant impacts on Northern Hemisphere climate and marine ecosystems. Several studies have discussed a potential linkage between North Pacific and Atlantic climate on various time scales. On decadal time scales no relationship could be confirmed, potentially due to sparse instrumental observations before 1950. Proxy data are limited and no multi-centennial high-resolution marine geochemical proxy records are available from the subarctic North Pacific. Here we present an annually-resolved record (1818–1967) of Mg/Ca variations from a North Pacific/Bering Sea coralline alga that extends our knowledge in this region beyond available data. It shows for the first time a statistically significant link between decadal fluctuations in sea-level pressure in the North Pacific and North Atlantic. The record is a lagged proxy for decadal-scale variations of the Aleutian Low. It is significantly related to regional sea surface temperature and the North Atlantic Oscillation (NAO) index in late boreal winter on these time scales. Our data show that on decadal time scales a weaker Aleutian Low precedes a negative NAO by several years. This atmospheric link can explain the coherence of decadal North Pacific and Atlantic Multidecadal Variability, as suggested by earlier studies using climate models and limited instrumental data.
Aleutian Low, North Atlantic Oscillation, North Pacific, Atlantic Multidecadal Variability, Mg/Ca, Coralline algae
0930-7575
1447-1455
Hetzinger, S.
41a3e890-6bd0-4820-bd23-289ece945258
Halfar, J.
be2bec8c-8fdf-423c-a6dd-fa0af6b37d5f
Mecking, J.V.
9b090069-5061-4340-b736-9690894ce203
Keenlyside, N.S.
22ae635e-b1bd-4040-9b0e-1fb315efce40
Kronz, A.
e04c60a3-7ccd-425d-9fcd-4970d1789c7a
Steneck, R.S.
db161cb8-6c64-4418-83fc-e13796fc4419
Adey, W.H.
7bcb9fa7-efe9-4203-b730-317fd0ebefb4
Lebednik, P.A.
2a987f16-0de8-400a-bbb3-361d865cb904
Hetzinger, S.
41a3e890-6bd0-4820-bd23-289ece945258
Halfar, J.
be2bec8c-8fdf-423c-a6dd-fa0af6b37d5f
Mecking, J.V.
9b090069-5061-4340-b736-9690894ce203
Keenlyside, N.S.
22ae635e-b1bd-4040-9b0e-1fb315efce40
Kronz, A.
e04c60a3-7ccd-425d-9fcd-4970d1789c7a
Steneck, R.S.
db161cb8-6c64-4418-83fc-e13796fc4419
Adey, W.H.
7bcb9fa7-efe9-4203-b730-317fd0ebefb4
Lebednik, P.A.
2a987f16-0de8-400a-bbb3-361d865cb904

Hetzinger, S., Halfar, J., Mecking, J.V., Keenlyside, N.S., Kronz, A., Steneck, R.S., Adey, W.H. and Lebednik, P.A. (2012) Marine proxy evidence linking decadal North Pacific and Atlantic climate. Climate Dynamics, 39 (6), 1447-1455. (doi:10.1007/s00382-011-1229-4).

Record type: Article

Abstract

Decadal- to multidecadal variability in the extra-tropical North Pacific is evident in 20th century instrumental records and has significant impacts on Northern Hemisphere climate and marine ecosystems. Several studies have discussed a potential linkage between North Pacific and Atlantic climate on various time scales. On decadal time scales no relationship could be confirmed, potentially due to sparse instrumental observations before 1950. Proxy data are limited and no multi-centennial high-resolution marine geochemical proxy records are available from the subarctic North Pacific. Here we present an annually-resolved record (1818–1967) of Mg/Ca variations from a North Pacific/Bering Sea coralline alga that extends our knowledge in this region beyond available data. It shows for the first time a statistically significant link between decadal fluctuations in sea-level pressure in the North Pacific and North Atlantic. The record is a lagged proxy for decadal-scale variations of the Aleutian Low. It is significantly related to regional sea surface temperature and the North Atlantic Oscillation (NAO) index in late boreal winter on these time scales. Our data show that on decadal time scales a weaker Aleutian Low precedes a negative NAO by several years. This atmospheric link can explain the coherence of decadal North Pacific and Atlantic Multidecadal Variability, as suggested by earlier studies using climate models and limited instrumental data.

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More information

Published date: September 2012
Keywords: Aleutian Low, North Atlantic Oscillation, North Pacific, Atlantic Multidecadal Variability, Mg/Ca, Coralline algae
Organisations: Physical Oceanography

Identifiers

Local EPrints ID: 378189
URI: https://eprints.soton.ac.uk/id/eprint/378189
ISSN: 0930-7575
PURE UUID: 4dca896f-67e7-480b-af9d-b22aa5198724

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Date deposited: 19 Jun 2015 12:25
Last modified: 17 Jul 2017 20:54

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Contributors

Author: S. Hetzinger
Author: J. Halfar
Author: J.V. Mecking
Author: N.S. Keenlyside
Author: A. Kronz
Author: R.S. Steneck
Author: W.H. Adey
Author: P.A. Lebednik

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