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Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

Abstract : [1] 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.
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Soumis le : jeudi 17 septembre 2020 - 13:57:59
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Keith B. Rodgers, Olivier Aumont, Gurvan Madec, Christophe E. Menkès, Bruno Blanke, et al.. Radiocarbon as a thermocline proxy for the eastern equatorial Pacific. Geophysical Research Letters, American Geophysical Union, 2004, 31, pp.L14314. ⟨10.1029/2004GL019764⟩. ⟨hal-00154546⟩



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