HR: 14:10h
AN: U23A-03 [Abstracts]
TI: PLEISTOCENE GLACIAL TERMINATIONS
AU: * Sarnthein, M
EM: ms@gpi.uni-kiel.de
AF: Institut fr Geowissenschaften
Christian-Albrechts-Universtaet zu Kiel, Olshausenstr. 40, Kiel, 24118
Germany
AU: Gebhardt, H
EM: hg@gpi.uni-kiel.de
AF: Institut fr Geowissenschaften
Christian-Albrechts-Universtaet zu Kiel, Olshausenstr. 40, Kiel, 24118
Germany
AU: Kiefer, T
EM: tkie02@esc.cam.ac.uk
AF: Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB3 2EQ
United Kingdom
AU: Erlenkeuser, H
EM: HErlenkeuser@leibniz.uni-kiel.de
AF: Leibniz-Laboratory for Radiometric Dating and Stable Isotope Research
Kiel University, Max-Eyth-Str. 11, Kiel, 24118
Germany
AU: Kissel, C
EM: Catherine.Kissel@lsce.cnrs-gif.fr
AF: LSCE, Avenue de la Terrasse, Bat 12, Gif-sur-Yvette, 91198
France
AU: Roehl, U
EM: uroehl@allgeo.uni-bremen.de
AF: Fachbereich Geowissenschaften
Universitaet Bremen, Postfach 330440, Bremen, 28334
Germany
AU: Schmieder, F
EM: schmiede@uni-bremen.de
AF: Fachbereich Geowissenschaften
Universitaet Bremen, Postfach 330440, Bremen, 28334
Germany
AB:
Major climate cycles of the last 800 ky are well established as product of orbital forcing. In addition, 100-ky glacial
cycles and in particular, their abrupt terminations (Broecker and von Donk, 1970) record abrupt ocean changes that require
additional forcing and threshold mechanisms in the field of ocean thermohaline circulation (THC). In this study we compare
records of circulation events with decadal-millennial-scale resolution, which characterize the glacial terminations near both
the terminus and the source regions of global THC, that is in the subarctic N.W. Pacific, the South China Sea, and the S.W.
Greenland Sea. In these regions glacial terminations and early peak interglacials were likewise marked by extremes in the
intensity of meridional overturning circulation, extremes that apparently presented short-term recurrences of the
mid-Pliocene circulation regime of the ocean, with a maximum intensity of the Denmark Strait Overflow, a maximum incursion of
Upper Pacific Deepwater into the South China Sea, and a strong vertical turnover rate in the subarctic Pacific. This
flushing of the deep ocean was totally different from modern THC conditions.
DE: 3344 Paleoclimatology
DE: 4267 Paleoceanography
DE: 1724 Ocean sciences
DE: 1600 GLOBAL CHANGE (New category)
SC: Union [U]
MN: 2004 AGU Fall Meeting