Radiocarbon as a thermocline proxy for the eastern equatorial

[1] An ocean model is used to test the idea that sea surface D14C behaves as a thermocline proxy in the eastern equatorial Pacific. The ORCA2 model, which includes D14C as a passive tracer, has been forced with reanalysis fluxes over 1948–1999, and the output is compared with a previously reported G...

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Bibliographic Details
Main Authors: Keith B. Rodgers, Olivier Aumont, Gurvan Madec, Christophe Menkes, Bruno Blanke, Patrick Monfray, James C. Orr, Daniel P. Schrag
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2004
Subjects:
thermocline. INDEX TERMS
4231 Oceanography
General
Equatorial oceanography
4255 Oceanography
Numerical modeling
4808Oceanography
Biological and Chemical
Chemical
Antarctic
Galapagos
Pacific
Antarc*
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.664.1795
http://schraglab.unix.fas.harvard.edu/publications/CV64.pdf
Description
Summary:[1] An ocean model is used to test the idea that sea surface D14C behaves as a thermocline proxy in the eastern equatorial Pacific. The ORCA2 model, which includes D14C as a passive tracer, has been forced with reanalysis fluxes over 1948–1999, and the output is compared with a previously reported Galapagos D14C record. The model reproduces the abrupt increase in the seasonally minimum D14C 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 ModeWater (SAMW) component of the upwelling water, thereby representing a decrease in entrainment of water from below the base of the directly ventilated

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