New aspects of organic carbon deposition and its paleoceanographic implications along the Northern Barents Sea Margin during the last 30,000 years

American Geophysical Union (AGU) - Tập 13 Số 4 - Trang 384-394 - 1998
Jochen Knies, Ruediger Stein

Tóm tắt

We studied variations in terrigenous (TOM) and marine organic matter (MOM) input in a sediment core on the northern Barents Sea margin over the last 30 ka. Using a multiproxy approach, we reconstructed processes controlling organic carbon deposition and investigated their paleoceanographic significance in the North Atlantic‐Arctic Gateways. Variations in paleo‐surface‐water productivity are not documented in amount and composition of organic carbon. The highest level of MOM was deposited during 25–23 ka as a result of scavenging on fine‐grained, reworked, and TOM‐rich material released by the retreating Svalbard/Barents Sea ice sheet during the late Weichselian. A second peak of MOM is preserved because of sorptive protection by detrital and terrigenous organic matter, higher surface‐water productivity due to permanent intrusion of Atlantic water, and high suspension load release by melting sea ice during 15.9–11.2 ka.

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Thông tin xuất bản

American Geophysical Union (AGU)

Tập 13 Số 4

384-394

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