Sharon S. Hoffmann

Sharon S. Hoffmann Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole, MA 02543 (508) 289-3423 [email protected]

Education Ph.D., Marine Geology and Geophysics, expected 2008. Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography Proposed thesis title: East Side, West Side: A History of Arctic Geochemical Gradients. Thesis advisor: Jerry F. McManus.

B.A., 1999, Geological Sciences and English Columbia College, Columbia University (summa cum laude)

Fellowships, Scholarships, and Honors Graduate: Undergraduate: Schlanger Ocean Drilling Fellowship (2004-2005) Phi Beta Kappa M.I.T. Presidential Scholarship (2002-2003) Rabi Scholars Program (1995-1999)

Honorable Mention , N.S.F. Graduate Research National Merit Scholarship (1995-1999) Fellowship (2003) Dean's List (1995-1999)

Research Experience Woods Hole Oceanographic Institution, Woods Hole, MA Graduate Student, June 2002-present

Thesis describes changes in U-series radionuclide deposition in sediments of the Arctic Ocean during the late glacial, deglaciation, and Holocene periods, and their importance for understanding sedimentation and water column processes. Techniques used include sediment digestion, ion-exchange chromatography, inductively-coupled plasma mass spectrometry, stable isotope analysis of oxygen and carbon, 14C dating, simple 1-dimensional modelling.

Lamont-Doherty Earth Observatory, Palisades, NY Senior Research Assistant, November 1998 – June 2002 Assisted with research on North Atlantic millennial-scale climate change in the Holocene and glacial periods. Processed deep sea core samples, identified and picked foraminifera for isotopic, radiocarbon and species assemblage studies, used Geotek multi-sensor core logger for core magnetic susceptibility data and core imaging, trained students and casual employees.

Lamont-Doherty Earth Observatory, Palisades, NY Rabi Scholar Internship, May 1997 - November 1998 Collected and analyzed soil data from municipal construction borehole records, for use in an emergency planning computer simulation program.

American Museum of Natural History, New York City, NY Rabi Scholar Internship, Summer 1996 Studied and identified fossil mammal teeth. Teaching Experience 2007 Guest Lecturer, Boston College, GE530 Marine Geology and Geophysics. Lectured, prepared lectures, planned syllabus, developed homework assignments and exam questions, graded homework and exams. 2005 Teaching Assistant, MIT/WHOI Joint Program, 12.710 Marine Geology & Geophysics I. Led recitations, graded homework.

Field Experience 2005 International Arctic Research Center Summer School: Climate Change in the Arctic Ocean Held shipboard during the 2005 Nansen and Amundsen Basins Observation System research cruise to the Laptev Sea, aboard Russian icebreaker Kapitan Dranitsyn. Assisted with water sample processing, in situ filtering, cell culturing, enzyme activity analyses. 2002 Shipboard scientific party, USCGC Healy cruise 02-02, investigating water-column and sedimentary nitrate budgets in the Bering Sea. Assisted with coring, oxygen microprobe profiles, sampling, oxygen titration.

Service 2007 Participant in Falmouth Kids Global Climate Change Institute, a K-12 educational project 2004-2005 Joint Program Student Representative; organized informal student lecture series, organized visit of 2005 WHOI Steinbach Scholar, member of WHOI Educational Council

Publications Hoffmann, S.S., J.F. McManus Is There a 230Thorium Deficit in Arctic Sediments? Earth and Planetary Science Letters, 258, p. 516-527, 2007.

Lehmann, M. F., D. M. Sigman, D. C. McCorkle, B. G. Brunelle, S. Hoffmann, M. Kienast, G. Cane, J. Clement, The origin of the deep Bering Sea nitrate deficit -- Constraints from the nitrogen and oxygen isotopic composition of water column nitrate and benthic nitrate fluxes, Global Biogeochemical Cycles, 19, GB4005, 10.1029/2005GB002508, 2005.

Bond, G., B. Kromer, J. Beer, R. Muscheler, M.N. Evans, W. Showers, S. Hoffmann, R. Lotti-Bond, I. Hajdas, G. Bonani, Persistent solar influence on North Atlantic climate during the Holocene, Science, 294, p. 2130- 2136, 2001.

Bond, G., C. Mandeville, S. Hoffmann, 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, 20, p. 1189-1199, 2001.

Abstracts and Presentations Hoffmann, S.S., J.F. McManus, Sedimentary 231Pa/230Th records of 231Pa export and sedimentation from the East and West Central Arctic, abstract submitted to AGU Fall Meeting 2007.

Hoffmann, S.S., J.F. McManus, Downcore 231Pa and 231Pa/230Th Records from the Central Arctic Ocean, Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract OS53B-1107, 2006. Poster presentation.

Hoffmann, S.S., J.F. McManus, Is There a 230Thorium Deficit in Arctic Sediments? Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract PP31B-1520, 2005. Poster presentation.

Cochran, J.K., C.T. Evans, J.W. Deming, S. Hoffmann, A. Thompson, D.J. Hirschberg, Thorium-234 and POC fluxes and extracellular enzymatic activity in the Laptev Sea, abstract submitted to AGU Ocean Sciences 2008 Meeting.

Invited talk, April 2006: Boston University Climate Seminar, “Is there a 230-Thorium deficit in Arctic sediments?”