HR: 1340h
AN: OS33B-1266    [Abstracts]
TI: Organic-Carbon Burial and Oxygen Depletion Along the Margin of Western North America During the Past 60,000 Years: Teleconnections With Greenland Ice and the Cariaco Basin
AU: * Dean, W E
EM: dean@usgs.gov
AF: U. S. Geological Survey, MS980 Federal Center, Denver, CO 80225, United States
AB: During Oxygen Isotope Stage 3 (OIS3; 60-24 cal ka),), the Bolling/Allerod warm interval (B/A; 15-13 cal ka), and the Holocene, bottom-water oxygen levels were much lower, and organic carbon (Corg) burial was much higher on all margins of the Californias (Alta and Baja) than during the last glacial interval (LGI; 24-15 cal ka) and the Younger Dryas cold interval (YD; 13-11.6 cal ka). Burial of Corg during the LGI-B/A-Holocene transition in the Cariaco Basin on the margin of northern Venezuela is remarkably similar to that on the California margin. Correlation between Dansgaard-Oeschger (D-O) cycles in Greenland ice with gray-scale measurements in varved sediments in the Cariaco Basin, and cycles of Corg burial on the Baja California margin are well established. Synchronous climate-driven changes as recorded in the sediments on the margins of the Californias, sediments from the Cariaco Basin, and in the GISP-2 Greenland ice core support the hypothesis that changes in atmospheric dynamics played a major role in abrupt climate change during the last 60 ky.
DE: 0428 Carbon cycling (4806)
DE: 1030 Geochemical cycles (0330)
DE: 1051 Sedimentary geochemistry
DE: 1635 Oceans (1616, 3305, 4215, 4513)
DE: 3022 Marine sediments: processes and transport
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting