Combined Coccolith, Foraminiferal, and Biomarker Reconstruction of Paleoceanographic Conditions Over the Past 120 kyr in the Northern North Atlantic (59°N, 23°W)

TitleCombined Coccolith, Foraminiferal, and Biomarker Reconstruction of Paleoceanographic Conditions Over the Past 120 kyr in the Northern North Atlantic (59°N, 23°W)
Publication TypeJournal Article
Year of Publication1999
AuthorsWeaver, PPE, Chapman, MR, Eglinton, G, Zhao, M, Rutledge, D, Read, G
JournalPaleoceanography
Volume14
Pagination336-349
ISBN Number0883-8305
Abstract

We present data for North Atlantic core Biogeochemical Ocean Flux Study (BOFS) 16K (59°N, 23°W, water depth 2370 m) including coccolith flora, ∂18O, planktonic foraminiferal sea surface temperatures (SSTs) by FA20 and SIMMAX methods, and alkenone-based U37K and U37K′ SSTs. A good correlation exists between the abundances of cold water coccolith species and foraminifera, and a broad correlation exists between coccolith and alkenone abundances except in the Holocene. Reworked Cretaceous coccoliths at the Last Glacial Maximum are coincident with warm deviations of the U37K′ signal. Assessment of various calibrations of U37K and U37K′ with paleotemperature shows the inappropriateness of a global correlation. We have produced a North Atlantic U37K′ calibration on the basis of North Atlantic data alone (U37K′=0.026T+0.186), which produces SST data for summer season at 0 m water depth, comparable to the warm season foraminiferal SSTs, except during the intervals 26–36, 58–65, and 100–120 ka when the alkenones indicate somewhat cooler surface waters.

URLhttp://dx.doi.org/10.1029/1999PA900009
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