Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

Rodgers, Keith B.; Aumont, Olivier; Madec, Gurvan; Menkes, Christophe; Blanke, Bruno; Monfray, Patrick; Orr, James C.; Schrag, Daniel P.. 2004 Radiocarbon as a thermocline proxy for the eastern equatorial Pacific. Geophysical Research Letters, 31. L14314. 10.1029/2004GL019764

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An ocean model is used to test the idea that sea surface Δ14C behaves as a thermocline proxy in the eastern equatorial Pacific. The ORCA2 model, which includes Δ14C as a passive tracer, has been forced with reanalysis fluxes over 1948–1999, and the output is compared with a previously reported Galapagos Δ14C record. The model reproduces the abrupt increase in the seasonally minimum Δ14C 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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2004GL019764
ISSN: 0094-8276
Date made live: 15 Jan 2009 +0 (UTC)

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