Sharon Hoffmann

Adjunct Associate Research Scientist
Lamont-Doherty Earth Observatory
Geochemistry
423 Comer
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
Phone: 
(845) 365-8793
Fax: 
(845) 365-8155
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
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)