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Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

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.
0094-8276
L14314
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.
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, L14314. (doi:10.1029/2004GL019764).

Record type: Article

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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More information

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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Contributors

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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