Radiocarbon as a thermocline proxy for the eastern equatorial Pacific
Radiocarbon as a thermocline proxy for the eastern equatorial Pacific
An ocean model is used to test the idea that sea surface ?14C behaves as a thermocline proxy in the eastern equatorial Pacific. The ORCA2 model, which includes ?14C as a passive tracer, has been forced with reanalysis fluxes over 1948–1999, and the output is compared with a previously reported Galapagos ?14C record. The model reproduces the abrupt increase in the seasonally minimum ?14C in 1976/77 found in the data. This increase is associated with neither a shift of thermocline depth over the NINO3 region, nor a change in the relative proportion of Northern/Southern source waters. Rather, it is due to a decrease in the Sub-Antarctic Mode Water (SAMW) component of the upwelling water, thereby representing a decrease in entrainment of water from below the base of the directly ventilated thermocline.
L14314
Rodgers, Keith B.
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Aumont, Olivier
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Madec, Gurvan
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Menkes, Christophe
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Blanke, Bruno
b223bcd4-5fcf-4d9b-bf36-f21675932e14
Monfray, Patrick
9ca9834b-9ef5-4933-af4b-b9597f6245f6
Orr, James C.
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Schrag, Daniel P.
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30 July 2004
Rodgers, Keith B.
1078c51c-546c-486a-90fb-f33a5662338a
Aumont, Olivier
6ea5af9d-4c27-42d9-9ba7-749729efa72f
Madec, Gurvan
ffb28deb-4bbd-4a4c-914f-492f813e4864
Menkes, Christophe
5471b65b-0584-49ff-b27f-4c7b29e75bbd
Blanke, Bruno
b223bcd4-5fcf-4d9b-bf36-f21675932e14
Monfray, Patrick
9ca9834b-9ef5-4933-af4b-b9597f6245f6
Orr, James C.
46a466b9-a3e6-4f5d-82a1-0dbd848536fb
Schrag, Daniel P.
5c21604f-e862-4666-8ad5-d2e51c0c2753
Rodgers, Keith B., Aumont, Olivier, Madec, Gurvan, Menkes, Christophe, Blanke, Bruno, Monfray, Patrick, Orr, James C. and Schrag, Daniel P.
(2004)
Radiocarbon as a thermocline proxy for the eastern equatorial Pacific.
Geophysical Research Letters, 31, .
(doi:10.1029/2004GL019764).
Abstract
An ocean model is used to test the idea that sea surface ?14C behaves as a thermocline proxy in the eastern equatorial Pacific. The ORCA2 model, which includes ?14C as a passive tracer, has been forced with reanalysis fluxes over 1948–1999, and the output is compared with a previously reported Galapagos ?14C record. The model reproduces the abrupt increase in the seasonally minimum ?14C in 1976/77 found in the data. This increase is associated with neither a shift of thermocline depth over the NINO3 region, nor a change in the relative proportion of Northern/Southern source waters. Rather, it is due to a decrease in the Sub-Antarctic Mode Water (SAMW) component of the upwelling water, thereby representing a decrease in entrainment of water from below the base of the directly ventilated thermocline.
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Published date: 30 July 2004
Organisations:
National Oceanography Centre,Southampton
Identifiers
Local EPrints ID: 64807
URI: http://eprints.soton.ac.uk/id/eprint/64807
ISSN: 0094-8276
PURE UUID: 5514d0bf-eeb2-441b-8e83-145cb1d7dcc2
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Date deposited: 15 Jan 2009
Last modified: 15 Mar 2024 12:02
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Author:
Keith B. Rodgers
Author:
Olivier Aumont
Author:
Gurvan Madec
Author:
Christophe Menkes
Author:
Bruno Blanke
Author:
Patrick Monfray
Author:
James C. Orr
Author:
Daniel P. Schrag
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