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