Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

• Published in: Geophysical Research Letters
• Main Authors: Rodgers, Kb, Aumont, O, Madec, G, Menkes, C, Blanke, Bruno, Monfray, P, Orr, Jc, Schrag, Dp
• Format: Article in Journal/Newspaper
• Language: English
• Published: Amer Geophysical Union 2004
• Subjects: Antarctic; Galapagos; Pacific; Antarc*
• Online Access: https://archimer.ifremer.fr/doc/00000/10834/9261.pdf; https://doi.org/10.1029/2004GL019764; https://archimer.ifremer.fr/doc/00000/10834/

An ocean model is used to test the idea that sea surface Delta(14)C behaves as a thermocline proxy in the eastern equatorial Pacific. The ORCA2 model, which includes Delta(14)C as a passive tracer, has been forced with reanalysis fluxes over 1948-1999, and the output is compared with a previously reported Galapagos Delta(14)C record. The model reproduces the abrupt increase in the seasonally minimum Delta(14)C 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.