sidney | Lamont-Doherty Earth Observatory

Dr. Sidney R. Hemming

Associate Professor

Earth and Environmental Sciences

Geochemistry

413 Comer

61 Route 9W - PO Box 1000

Palisades

10964-8000

Phone:

(845) 365-8417

sidney@ldeo.columbia.edu

Fields of interest:

geochronology, sedimentary geochemistry, paleoclimate, continental crust evolution

Understanding the provenance and processes recorded in the geochemistry of sediments and sedimentary rocks lies at the heart of my research interests. I am also interested in geochronological studies. I have a strong interest in the tectonics and continental crust evolution questions on the longer time scale. I have an active program of applying radiogenic isotopes for tracing the sources of sediments with the goal of understanding Quaternary climate changes and associated changes in winds, currents and glaciers. Provenance studies of ice rafted detritus are key to working out the dynamic relationships among paleo-climate and paleo-ocean circulation and their interactions with the large ice sheets that covered the northern continents during the ice ages. Isotopic tracers are also important to understand other aspects of paleo-climate and paleoceanography. Nd and Pb isotope compositions of the authigenic Mn-Fe precipitates in marine sediments may be used to evaluate past changes in circulation of the deep ocean. Isotope tracers of the terrigenous clay fraction can be used to evaluate past changes in sediment sources and current paths.

Ar Geochronology Lab

Education

List of degrees from highest to lowest:

Ph.D.

SUNY Stony Brook

1994

Master of Science

Tulane

1986

Bachelor of Science

Midwestern

1983

Educational Activities:

V1012y - Intro. to Earth science I

V2100y - EES: Climate System

Lamont Projects:

CICAR

Selected Publications:

Contrasting compositions of Saharan dust in the eastern Atlantic Ocean during the last deglaciation and African Humid Period, Cole, J. M.; Goldstein, S. L.; deMenocal, P. B.; Hemming, S. R.; Grousset, F. E. , Earth and Planetary Science Letters, Volume 278, Issue 3-4, p.257-266, (2009), doi:10.1016/j.epsl.2008.12.011

Spectral analysis of the lower Eocene Wilkins Peak Member, Green River Formation, Wyoming: Support for Milankovitch cyclicity, Machlus, M. L.; Olsen, P. E.; Christie-Blick, N.; Hemming, S. R. , Earth and Planetary Science Letters, Apr 15, Volume 268, Issue 1-2, p.64-75, (2008), DOI 10.1016/j.epsl.2007.12.024

Modeling the marine nd isotope variability with an offline ocean general circulation model, Jones, K. M.; Khatiwala, S.; Goldstein, S. L.; Hemming, S. R.; van de Flierdt, T. , Geochimica Et Cosmochimica Acta, Jul, Volume 72, Issue 12, p.A439-A439, (2008)

Ar-40/Ar-39 ages of hornblende grains and bulk Sm/Nd isotopes of circum-Antarctic glacio-marine sediments: Implications for sediment provenance in the Southern Ocean, Roy, M.; van de Flierdt, T. V.; Hemming, S. R.; Goldstein, S. L. , Chemical Geology, Oct 15, Volume 244, Issue 3-4, p.507-519, (2007), DOI 10.1016/j.chemgeo.2007.07.017

Heinrich events: Massive late pleistocene detritus layers of the North Atlantic and their global climate imprint, Hemming, S. R. , Reviews of Geophysics, Mar 18, Volume 42, Issue 1, p.-, (2004), Doi 10.1029/2003rg000128

Radiogenic isotopes as tracers of sediment provenance and flux: Paleoceanography of the South Atlantic, Franzese, A. M.; Hemming, S. R.; Goldstein, S. L.; Anderson, R. F.; Broecker, W. S. , Geochimica Et Cosmochimica Acta, Sep, Volume 67, Issue 18, p.A102-A102, (2003)

Ar-40/Ar-39 ages and Ar-40* concentrations of fine-grained sediment fractions from North Atlantic Heinrich layers, Hemming, S. R.; Hall, C. M.; Biscaye, P. E.; Higgins, S. M.; Bond, G. C.; McManus, J. F.; Barber, D. C.; Andrews, J. T.; Broecker, W. S. , Chemical Geology, Feb 15, Volume 182, Issue 2-4, p.583-603, (2002), Pii S0009-2541(01)00342-4

Laschamp excursion at Mono Lake?, Kent, D. V.; Hemming, S. R.; Turrin, B. D. , Earth and Planetary Science Letters, Apr 15, Volume 197, Issue 3-4, p.151-164, (2002), Pii S0012-821x(02)00474-0

Paleoclimate - Climate swings come into focus, Broecker, W. S.; Hemming, S. , Science, Dec 14, Volume 294, Issue 5550, p.2308-2309, (2001)