Radiocarbon as a thermocline proxy for the eastern equatorial Pacific - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2004

Radiocarbon as a thermocline proxy for the eastern equatorial Pacific

(1) , (1) , (1) , (1) , (2) , (3) , (4, 5) ,
1
2
3
4
5

Abstract

[1] 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.
Fichier principal
Vignette du fichier
2004GL019764.pdf (172.61 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

hal-00154546 , version 1 (17-09-2020)

Identifiers

Cite

Keith B. Rodgers, Olivier Aumont, Gurvan Madec, Christophe E. Menkès, Bruno Blanke, et al.. Radiocarbon as a thermocline proxy for the eastern equatorial Pacific. Geophysical Research Letters, 2004, 31, pp.L14314. ⟨10.1029/2004GL019764⟩. ⟨hal-00154546⟩
233 View
53 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More