HR: 0800h
AN: PP51A-0585    [Abstracts]
TI: 250,000 Years of Ice-Volume Change at Millennial Resolution
AU: * Thompson, W G
EM: wthompson@whoi.edu
AF: Woods Hole Oceanographic Institution, Woods Hole Road, Woods Hole, MA 02543 United States
AB: It is well established that global ice volume varies at orbital timescales. The primary evidence of this comes from the marine oxygen isotope record and U/Th dating of coral terraces. Considerable improvement continues to be made in analytical techniques for measuring U-series isotopes, and the body of U-series coral data has grown at an ever-increasing pace. However, progress on the coral record of sea level has been seriously impeded by the open-system behavior of U-series nuclides in corals. Here, a sea-level curve for the last two glacial-interglacial cycles is constructed using a new approach to coral dating that corrects ages for the well-documented age bias introduced by open-system behavior. In addition to the expected ice volume variability related to changes in the Earth's orbit, this record resolves higher-frequency sea-level cycles that occur over a few thousand years. This sub-orbital period ice volume change is also apparent in salinity records and marine oxygen isotope records.
DE: 1105 Quaternary geochronology
DE: 1605 Abrupt/rapid climate change (4901, 8408)
DE: 1641 Sea level change (1222, 1225, 4556)
DE: 3344 Paleoclimatology (0473, 4900)
DE: 4916 Corals (4220)
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005