sharonh

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Sharon Hoffmann
Adjunct Associate Research Scientist
Lamont-Doherty Earth Observatory
Geochemistry
sharonh@ldeo.columbia.edu

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Fields of interest: 
Paleoceanography and climate change

I study ancient changes in climate and ocean circulation, from the Arctic on down to the tropics.

I use the isotopes 231Pa and 230Th in the ocean and sediments to study how Arctic circulation and sedimentation has changed since the last ice age. I also work on stalagmites from caves in Borneo, reconstructing high resolution records of the El Nino/Southern Oscillation during the Holocene.

I am a Columbia Science Fellow, and teach two sections of Frontiers of Science, a required freshman class, each semester.

Education
List of degrees from highest to lowest:
PhD, Marine Geology
MIT/WHOI Joint Program in Oceanography
2009
BA, Geological Sciences & English
Columbia University
1999

Educational Activities: 
Frontiers of Science, Columbia College

Selected Publications:

Is There a 230Thorium Deficit in Arctic Sediments? Hoffmann, S.; McManus, J. Earth and Planetary Sciences Volume: 258 Issue: 516-527 (2007)
Persistent solar influence on north Atlantic climate during the Holocene Bond, G.; Kromer, B.; Beer, J.; Muscheler, R.; Evans, M. N.; Showers, W.; Hoffmann, S.; Lotti, R.; Hajdas, I.; Bonani, G. Science Dec 7 Volume: 294 Issue: 5549 p.: 2130-2136 (2001)
Were rhyolitic glasses in the Vedde Ash and in the North Atlantic's Ash Zone 1 produced by the same volcanic eruption?, Bond, G. C.; Mandeville, C.; Hoffmann, S. Quaternary Science Reviews May Volume: 20 Issue: 11 p.: 1189-1199 (2001)