HR: 16:45h
AN: PP24A-04 INVITED [Abstracts]
TI: C14 Reservoir Ages Trace Basic Changes in Ocean Circulation Over Glcial Termination 1A
AU: * Sarnthein, M
EM: ms@gpi.uni-kiel.de
AF: Institute of Geosciences, University of Kiel, Olshausenstr. 40, Kiel, -- 24118
Germany
AU: Kennett, J P
EM: kennett@geol.ucsb.edu
AF: Dept. of Earth Sciences, University of California, Santa Barbara, Santa Barbara, CA 93106
United States
AU: Grootes, P M
EM: pgrootes@leibniz.uni-kiel.de
AF: Leibniz Laboratory, University of Kiel, Olshausenstr. 40, Kiel, -- 24118
Germany
AU: Nadeau, M
EM: mnadeau@leibniz.uni-kiel.de
AF: Leibniz Laboratory, University of Kiel, Olshausenstr. 40, Kiel, -- 24118
Germany
AU: Sieler, C
EM: csi@gpi.uni-kiel.de
AF: Institute of Geosciences, University of Kiel, Olshausenstr. 40, Kiel, -- 24118
Germany
AB:
We used distinct 14C plateaus near 14.0, 13.3-12.8, and 12.3-12.1 (atm.) 14C ka in the Cariaco Basin record during
deglacial stadial Heinrich 1 (H1) (Hughen et al., 2004) to tune past - 14C reservoir ages of ocean water masses and tie
paleoceanographic signals to the ice core record of climate change. Reservoir ages of northwest Pacific surface water
dropped to 350 yr (vs. 750 yr today), likewise benthic reservoir ages from 2600 to 1400 yr, recording close-by deepwater
convec-tion. Coeval deepwater ages of 2000 yr in the Icelandic Sea, the source region of modern thermohaline circulation,
reflect a short-lasting Overflow reversal. Off California, planktic reservoir ages changed from 1400--1700 yr during early H1
to 750 yr in the Boelling (vs. 630 yr today), in harmony with reservoir ages of upwelled intermediate water dropping from an
H1 extreme of 3850 yr to 1400 yr in the Boelling. In summary, these ages suggest a basic overturn of the deep ocean,
inducing the deglacial rise in atmospheric pCO2.
DE: 1105 Quaternary geochronology
DE: 1115 Radioisotope geochronology
DE: 1635 Oceans (1616, 3305, 4215, 4513)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005