Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

Details Radiocarbon as a thermocline proxy for the eastern equatorial Pacific Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3114314r&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 14, CiteID L14314

Mathematics

Logic

12

Oceanography: General: Equatorial Oceanography, Oceanography: General: Numerical Modeling, Oceanography: Biological And Chemical: Chemical Tracers

Scientific paper

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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