HR: 0800h
AN: PP41B-0645    [Abstracts]
TI: Constraining Mid Pliocene North Atlantic Warming Using a Multiproxy Approach
AU: * Dowsett, H
EM: hdowsett@usgs.gov
AF: U.S. Geological Survey, 926A National Center, Reston, VA 20192 United States
AU: Robinson, M
EM: mrobins3@gmu.edu
AF: U.S. Geological Survey, 926A National Center, Reston, VA 20192 United States
AU: Dwyer, G
EM: gsd3@duke.edu
AF: Division of Earth and Ocean Sciences, Duke University, Durham, NC 27708 United States
AU: Cronin, T
EM: tcronin@usgs.gov
AF: U.S. Geological Survey, 926A National Center, Reston, VA 20192 United States
AU: Chandler, M
EM: mac59@columbia.edu
AF: Columbia University - CCSR/GISS, 2880 Broadway, New York, NY 10025 United States
AB: Relatively high sea surface temperature during the mid Pliocene (~3.0 Ma) has been documented in many oceanic regions. Constraining the magnitude, variability, and regional extent of warming is critical for modeling experiments being undertaken based upon reconstruction of mid Pliocene conditions. A comprehensive re-evaluation of the mid Pliocene of the North Atlantic region using a multiproxy approach that includes quantitative planktic foraminifer analysis, and Mg:Ca paleothermometry on Neogloboquadrina pachyderma and Globigerina bulloides yields new insights into conditions occurring 3 million years ago. While the overall pattern of warming documented by the PRISM (Pliocene Research, Interpretation, and Synoptic Mapping) Project remains unchanged, mean regional warming in the North Atlantic may have been underestimated in earlier reconstructions. Model simulations using maximum and minimum probable SST reconstructions provide a more useful measure of the spatial variability of mid-Pliocene warmth and should produce more realistic model simulations.
DE: 4944 Micropaleontology (0459, 3030)
DE: 4954 Sea surface temperature
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005