Paleo-sea surface temperature calculations in the equatorial east Atlantic from Mg/Ca ratios in planktic foraminifera: A comparison to sea surface temperature estimates from UK'37, oxygen isotopes, and foraminiferal transfer function.

Nürnberg, Dirk , Müller, Anja and Schneider, Ralph (2000) Paleo-sea surface temperature calculations in the equatorial east Atlantic from Mg/Ca ratios in planktic foraminifera: A comparison to sea surface temperature estimates from UK'37, oxygen isotopes, and foraminiferal transfer function. Open Access Paleoceanography, 15 (1). pp. 124-134. DOI 10.1029/1999PA000370.

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Abstract

We present two ∼270 kyr paleo-sea surface temperature (SST) records from the Equatorial Divergence and the South Equatorial Current derived from Mg/Ca ratios in the planktic foraminifer Globigerinoides sacculifer. The present study suggests that the magnesium signature of G. sacculifer provides a seasonal SST estimate from the upper ∼50 m of the water column generated during upwelling in austral low-latitude fall/winter. Common to both down-core records is a glacial-interglacial amplitude of ∼3°–3.5°C for the last climatic changes and lower Holocene and glacial oxygen isotope stage 2 temperatures compared with interglacial stage 5.5 and glacial stage 6 temperatures, respectively. The comparison to published SST estimates from alkenones, oxygen isotopes, and foraminiferal transfer function from the same core material pinpoints discrepancies and conformities between methods.

Document Type: Article
Keywords: Paleo-sea surfach temperature (SST), Equatorial Divergence, South Equatorial Current
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/1999PA000370
ISSN: 0883-8305
Date Deposited: 18 Feb 2008 17:24
Last Modified: 23 Sep 2019 18:57
URI: http://oceanrep.geomar.de/id/eprint/2393

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