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North-Central Section - 43rd Annual Meeting (2-3 April 2009)

Paper No. 3
Presentation Time: 8:40 AM

NORTHWEST ATLANTIC PLANKTONIC FORAMINIFERAL MG/CA TEMPERATURES DURING THE LAST AND PENULTIMATE DEGLACIATIONS


WINSOR, Kelsey1, CARLSON, Anders E.2, KLINKHAMMER, Gary3, OBBINK, Elizabeth A.1, COLVILLE, Elizabeth J.1, MARCOTT, Shaun A.4 and KOZDON, Reinhard5, (1)Geology & Geophysics, University of Wisconsin-Madison, 1215 West Dayton, Madison, WI 53706, (2)Geoscience, University of Wisconsin-Madison, 1215 West Dayton, Madison, WI 53706, (3)College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, (4)Geoscience, Oregon State University, Corvallis, OR 97331, (5)Geology & Geophysics, University of Wisconsin-Madison, Madison, WI 53706, winsor@wisc.edu

During warming climate, the amplitude of sea surface temperature (SST) change in high latitude regions is greater than in lower latitudes. However, deglacial sea surface temperature (SST) records are relatively sparse in the subpolar and polar regions of the North Atlantic and are predominately focused in the eastern portion of the basin. Here, we present preliminary planktonic Neogloboquadrina pachyderma sinistral Mg/Ca sea sub-surface temperature records for the last and penultimate deglacial periods from the Eirik Drift, south of Greenland. Foraminiferal Mg/Ca was determined using a flow-through time-resolved analysis, which reduces uncertainty due to postdepositional alteration and recrystallization and residual clay. The new Mg/Ca records in combination with subtropic SST will be used to examine the phasing of deglacial warming. Preliminary data suggests that SST response to radiative forcing during the two deglaciations (last and penultimate) was of similar amplitude though with different phasing.

Session No. 3

T5. Climate Change
Thursday, 2 April 2009: 8:00 AM-12:00 PM
Geological Society of America Abstracts with Programs. Vol 41, No. 4, p.7
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