Publication Date:
2023-11-25
Description:
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 delta18O 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.
Keywords:
11071651 Pistoncore2; 11101338 Pistoncore5; 11191756 Piston core 8, TT013-PC72; 11220058 Pistoncore9; 11291231 Pistoncore13; Equatorial Pacific; PC; Piston corer; Thomas G. Thompson; TT013; TT013_114; TT013_18; TT013_32; TT013_72; TT013_83
Type:
Dataset
Format:
application/zip, 5 datasets
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