Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

被引：29

作者：

Rodgers, KB

Aumont, O

Madec, G

Menkes, C

Blanke, B

Monfray, P

Orr, JC

Schrag, DP

机构：

[1] Univ Paris 06, LODYC, MNHN, IRD,CNRS, F-75252 Paris 05, France

[2] UBO, IFREMER, CNRS, Lab Phys Oceans, F-29285 Brest, France

[3] UPS, IRD, CNES, CNRS,Lab Etud Geophys & Oceanog Spatiales, F-31401 Toulouse 4, France

[4] CEA Saclay, LSCE, CNRS, F-91191 Gif Sur Yvette, France

[5] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2004年 / 31卷 / 14期

关键词：

D O I：

10.1029/2004GL019764

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：L143141 / 4

页数：4