Assistant Professor, Marine Science Program and Earth and Ocean Sciences
Ph.D. University of Florida. 2005
My research focuses on the role of the oceans in the transition from very warm greenhouse climate conditions during the late Cretaceous and early Cenozoic (about 90 to 50 million years ago) to the present day glacial climate. Only 5% of geologic history contains evidence for continental scale ice sheets, emphasizing how unique this transition is. Deep-sea drill cores, taken from the sea bed over the last 40 years, store critical information about this long term cooling trend. I measure isotopic tracers of provenance contained in these sediments to understand past changes in critical components of the climate system such as ocean circulation, terrigenous inputs, and seawater chemistry. These insights into past climate provide valuable information about Earth's climate system, which is critical for accurately predicting future climate change.
Westerhold, T., Rohl, U., Wilkens, R., Palike, H., Lyle, M., Dunkley Jones, T., Bown, P., Moore, T., Kamikuri, S., Acton, G., Ohneiser, C., Yamamoto, Y., Richter, C., Fitch, P., Scher, H.D., Liebrand, D., and Expeditions 320/321 scientists (2012) Syntheses: Revised composite depth scales and integration of IODP Sites U1331, U1332, U1333, U1334 and ODP Sites 1218, 1219, 1220. Proc. IODP, 320/321: Tokyo (Integrated Ocean Drilling Program Management International, Inc.), DOI: 10.2204/iodp.proc.320321.201.2012.
Scher H.D., Bohaty S.M., Zachos J.C., Delaney M.L. (2011) Two-stepping into the icehouse: East Antarctic weathering during progressive ice-sheet expansion at the Eocene–Oligocene transition. Geology, 39(4): 383–386; doi: 10.1130/G31726.1.
Martin E.E., Blair S.W., Kamenov G.D., Scher, H.D., Bourbon E., Basak, C., Newkirk, D. (2010) Extraction of Nd isotopes from bulk deep sea sediments for paleoceanographic studies on Cenozoic time scales. Chemical Geology, 269: 414-431. doi:10.1016/j.chemgeo.2009.10.016
Scher H.D., Delaney M.L. (2010) Breaking the glass ceiling for high resolution Nd isotope records in paleoceanography. Chemical Geology, 269, 329-338. doi:10.1016/j.chemgeo.2009. 10.007
Scher H.D., Martin E.E. (2008) Oligocene deep water export from the North Atlantic and the development of the Antarctic Circumpolar Current examined with neodymium isotopes. Paleoceanography, 23, PA1205, doi:1210.1029/2006PA001400.
Scher H.D., Martin E.E. (2006) The timing and climatic influence of the opening of Drake Passage. Science, 312, 428-430.
MSCI 101: The Ocean Environment (Both General and Honors Sections)
MSCI 545/GEOL 545: Geological Oceanography
MSCI 553/GEOL 553: Marine Sediments