sharonh
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Adjunct Associate Research Scientist
Lamont-Doherty Earth Observatory
Geochemistry
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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.
Educational Activities:
Frontiers of Science, Columbia College
Selected Publications:
Is There a 230Thorium Deficit in Arctic Sediments?
Earth and Planetary Sciences
Volume: 258
Issue: 516-527
(2007)
Persistent solar influence on north Atlantic climate during the Holocene
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?,
Quaternary Science Reviews
May
Volume: 20
Issue: 11
p.: 1189-1199
(2001)