Export production and carbonate dissolution in the central equatorial Pacific Ocean over the past 1 Myr Public Deposited

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Copyright 2000 by the American Geophysical Union

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  • In order to quantify changes in export production and carbonate dissolution over the past 1 Myr in the central equatorial Pacific Ocean we analyzed Ba, P, Al, Ti, and Ca in 1106 samples from five piston cores gathered from 5°S to 4°N at 140°W. We focused on Ba/Ti, Al/Ti, and P/Ti ratios as export proxies and employed areally integrated time slice as well as time series strategies. Carbonate maxima from 0-560 kyr are characterized by 15-30% greater export than carbonate minima. The increases in export fall on glacial δ¹⁸O transitions rather than glacial maxima. From 560-800 kyr, overlapping with the mid-Pleistocene transition, there is a very large increase in total export yet no glacial-interglacial variability. The highest latitudes (5°S and 4°N) record minimal absolute export change from glacials to interglacials and yet record the most extreme minima in percent CaCO₃, indicating that carbonate records there are dominated by dissolution, whereas near the equator they are more influenced by changes in export.
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  • Murray, R. W., C. Knowlton, M. Leinen, A. C. Mix, and C. H. Polsky. "Export production and carbonate dissolution in the central equatorial Pacific Ocean over the past 1 Myr." Paleoceanography 15.6 (2000): 570-592.
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