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Patterns of CaCO₃deposition in the eastern tropical Pacific Ocean for the last 150 kyr: Evidence for a southeast Pacific depositional spike during marine isotope stage (MIS) 2

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https://ir.library.oregonstate.edu/concern/articles/m613n338c

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  • We constructed biogenic mass accumulation rate (MAR) time series for eastern Pacific core transects across the equator at ~105˚and ~85˚W and along the equator from 80˚to 140˚W. We used empirical orthogonal function (EOF) analysis to extract spatially coherent patterns of CaCO₃deposition for the last 150 kyr. EOF mode 1 (51% variance) is a CaCO₃ MAR spike centered in marine oxygen isotope stage 2 (MIS 2) found under the South Equatorial Current. EOF mode 2 (19% of variance) is high north of the equator. EOF mode 3 (9% of variance) is an east-west mode centered along the North Equatorial Counter Current. The MIS 2 CaCO₃spike is the largest event in the eastern Pacific for the last 150 kyr: CaCO₃MARs are 2–3 times higher at 18 ka than elsewhere in the record, including MIS 6. It is caused by high CaCO₃ production rather than minimal dissolution. EOF 2, while it resembles deep water flow patterns, nevertheless, shows coherence to Corg deposition and is probably also driven by CaCO₃production.
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  • Lyle, Mitchell, Alan Mix, and Nicklas Pisias. "Patterns of CaCO₃deposition in the eastern tropical Pacific Ocean for the last 150 kyr: Evidence for a southeast Pacific depositional spike during marine isotope stage (MIS) 2." Paleoceanography 17.2 (2002).
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  • 17
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  • 2
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