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Full-Text Articles in Earth Sciences
Radionuclide And Biomarker Proxies Of Past Ocean Circulation And Productivity In The Arabian Sea, A Pourmand, F Marcantonio, Ts Bianchi, Elizabeth A. Canuel, Ej Waterson
Radionuclide And Biomarker Proxies Of Past Ocean Circulation And Productivity In The Arabian Sea, A Pourmand, F Marcantonio, Ts Bianchi, Elizabeth A. Canuel, Ej Waterson
VIMS Articles
We present new excess Pa-231/Th-230 activity ratios and lipid biomarker results from northeastern Arabian Sea sediments (core 93KL) spanning the past 50 ka in an effort to constrain further the relationship between climate at low and high latitudes. Pa-231/Th-230 activity ratios are maintained at values significantly higher than the water-column production ratio of 0.093. Average Pa-231/Th-230 activity ratios are lower during the last glacial period than during the Holocene. The lowest Pa-231/Th-230 activity ratios coincide with the timing of Heinrich Events 1-5. Profiles of lipid biomarker fluxes and Pa-231/Th-230 activity ratios from 32 to 12 ka show similar patterns, suggesting …