HR: 17:00h
AN: OS14A-05    [Abstracts]
TI: Modeling Biogeochemical Responses to Massive Carbon Releases at the Paleocene- Eocene Thermal Maximum
AU: * Winguth, C
EM: cwinguth@uta.edu
AF: Dept. of Earth and Environmental Sci., University of Texas at Arlington Box 19049, Arlington, TX 76019, United States
AU: Winguth, A
EM: awinguth@uta.edu
AF: Dept. of Earth and Environmental Sci., University of Texas at Arlington Box 19049, Arlington, TX 76019, United States
AU: Franklin, M M
EM: mmfranklin@wisc.edu
AF: Dept. of Atmospheric and Oceanic Sci., University of Wisconsin - Madison 1225 W. Dayton St., Madison, WI 53706, United States
AB: For the Paleocene-Eocene Thermal Maximum (55 Mya), significant changes in climate and geochemistry have been inferred from changes in temperature proxies and stable carbon isotope ratios. The comprehensive climate model CCSM-3 including a carbon and nutrient cycle model is applied to explore effects of different magnitudes and rates of carbon release into the atmosphere on the lysocline and on CaCO3 accumulation rates. Paleocene-Eocene simulations with 8xCO2 indicate significant warming in the high latitudes and reduction of downwelling in the subtropical gyres. These results coincide with environmental shifts that have been recorded in these areas, such as decreased open-ocean productivity at lower latitudes at the onset of the Paleocene Eocene Thermal Maximum.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 0473 Paleoclimatology and paleoceanography (3344, 4900)
DE: 1622 Earth system modeling (1225)
DE: 4901 Abrupt/rapid climate change (1605)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting