geo 1 - G ulf Stream salinity variation du ring M IS 3 and...

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Gulf Stream salinity variation during M IS 3 and its linkage to D-O cycles Schmidt, M.W. , Vautravers, M.J. and Spero, H.J. Paleoclimate archives indicate that Marine Isotope Stage (MIS 3) was characterized by a highly variable climate, expressed in the Greenland ice cores as large temperature fluctuations associated with Dansgaard-Oeschger (D-O) cycles(Johnsen et al., 2001). However, an important question remains as to the trigger for these abrupt Northern Hemisphere climate swings. A popular theory implicates thermohaline circulation instability as a driver for D-O cycles, suggesting that salinity variability in surface waters delivered to the sub-polar North Atlantic via the Gulf Stream may have played a role in driving millennial-scale oscillations in glacial thermohaline circulation (Birchfield and Broecker, 1990; Broecker et al., 1990; Zaucker and Broecker, 1992). In order to investigate the relationship between Gulf Stream salinity variation and D-O cyles, we combine Mg/Ca measurements (a proxy for the temperature of calcification) with
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This note was uploaded on 01/31/2011 for the course GEL 1 taught by Professor Barfod during the Spring '08 term at UC Davis.

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geo 1 - G ulf Stream salinity variation du ring M IS 3 and...

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