Steven C. ClemensAssociate Professor of Earth, Environmental, and Planetary Sciences (Research)
I received my Ph.D. in Marine Geology at Brown University in 1990. I became an Adjunct Lecturer at Brown in 1992, and was promoted to Associate Professor of Research in 2005. I work with the Climate & Environment research group within the Department of Earth, Environmental and Planetary Sciences.
Moran K, Backman J, Brinkhuis H, Clemens SC, Cronin T, Dickens GR, Eynaud F, Gattacceca J, Jakobsson M, Jordan RW, Kaminski M, King J, Koc N, Krylov A, Martinez N, Matthiessen J, McInroy D, Moore TC, Onodera J, O'Regan M, Pälike H, Rea B, Rio D, Sakamoto T, Smith DC, Stein R, St John K, Suto I, Suzuki N, Takahashi K, Watanabe M, Yamamoto M, Farrell J, Frank M, Kubik P, Jokat W, Kristoffersen Y.
The Cenozoic palaeoenvironment of the Arctic Ocean.
J. Geophys. Res..
. full textPubMed
Chen, G.-S., Z. Liu, S. Clemens, W. L. Prell, and X. Liu, Modeling the timedependent response of the Asian summer monsoon to obliquity forcing in a coupled GCM: a PHASEMAP sensitivity experiment, Climate Dynamics, doi: 10.1007/s00382-010-0740-3, 2010.
Clemens, S.C., Prell, W.L., and Sun, Y., Orbital-scale timing and mechanisms driving Indo-Asian summer monsoons: Reinterpreting speleothem δ18O, Nature, in preparation, 2009.
Clemens, S.C., Prell, W.L., Sun, Y., Liu, Z., and Chen, G., Southern Hemisphere forcing of Pliocene δ18O and the evolution of Indo-Asian monsoons, Paleoceanography, 23, doi: 10.1029/2008pa001638. 2008.
Nie, J., King, J., Liu, Z., Clemens, S., Prell, W., Fang, X., Surface-water freshening: A cause for the onset of North Pacific stratification from 2.75 Ma onward?, Global and Planetary Change, 64 (1-2), 49-52, 2008.
Sun, Y., F. Wu, S. Clemens, and D. Oppo , Processes controlling the geochemical composition of the South China Sea sediments during the last climatic cycle, Chemical Geology, 257, 243-249, 2008.
Huang, Y., S. C. Clemens, et al. Large-scale hydrological change drove the late Miocene C4 plant expansion in the Himalayan foreland and Arabian Peninsula. Geology, 35, 531-534, 2007.
Liu, X., Z. Liu, Clemens, S.C., Prell, W.L., and Kutzbach, J.E. A coupled model study of glacial Asian monsoon variability and the Indian Ocean dipole." J. Metero. Soc. Japan 85: 1-10, 2007.
Gupta, A. K., Das, M., Clemens, S.C., Mukjherjee, B., Benthic foraminiferal fauna and isotopic changes as recorded in Holocene sediments of the northwest Indian Ocean, Paleoceanography, 23, doi:10.1029/2007PA001546, 2008.
Clemens, S. C., Prell, W.L., The timing of orbital-scale Indian monsoon changes, Quaternary Science Reviews, 26, 275-278, 2007.
Clemens, S. C., Extending the historical record by proxy, in The Asian Monsoon, edited by B. Wang, Praxis, New York, pp. 615-629, 2006.
Liu, X., Z. Liu, J. E. Kutzbach, S. C. Clemens, and W. L. Prell, Hemispheric insolation forcing of the Indian Ocean and Asian Monsoon: Local versus remote impacts. Journal of Climate, 19, 6195-6208, 2006.
Moran, K., J. Backman, H. Brinkhuis, S. C. Clemens, T. Cronin, G. R. Dickens, F. d. r. Eynaud, J. r. m. Gattacceca, M. Jakobsson, R. W. Jordan, M. Kaminski, J. King, N. Koc, A. Krylov, N. Martinez, J. Matthiessen, D. McInroy, T. C. Moore, J. Onodera, M. O'Regan, H. P√§like, B. Rea, D. Rio, T. Sakamoto, D. C. Smith, R. Stein, K. St John, I. Suto, N. Suzuki, K. Takahashi, M. Watanabe, M. Yamamoto, J. Farrell, M. Frank, P. Kubik, W. Jokat, and Y. Kristoffersen (2006), The Cenozoic palaeoenvironment of the Arctic Ocean, Nature, 441, 601.
Sluijs, A., S. Schouten, M. Pagani, M. Woltering, H. Brinkhuis, J. S. S. Damst√, G. R. Dickens, M. Huber, G.-J. Reichart, R. Stein, J. Matthiessen, L. J. Lourens, N. Pedentchouk, J. Backman, K. Moran, S. Clemens (2006), Subtropical Arctic Ocean temperatures during the Palaeocene/Eocene thermal maximum, Nature, 441, 610
Brinkhuis, H., S. Schouten, M. E. Collinson, A. Sluijs, J. S. S. Damst, G. R. Dickens, M. Huber, T. M. Cronin, J. Onodera, K. Takahashi, J. P. Bujak, R. Stein, J. van der Burgh, J. S. Eldrett, I. C. Harding, A. F. Lotter, F. Sangiorgi, H. v. K.-v. Cittert, J. W. de Leeuw, J. Matthiessen, J. Backman, K. Moran, S. Clemens (2006), Episodic fresh surface waters in the Eocene Arctic Ocean, Nature, 441, 606.
Sun, Y., J. Chen, Clemens, S.C., Liu, Q., Ji, L. and Tada, R. East Asian monsoon variability over the last seven glacial cycles recorded by a loess sequence from the northwestern Chinese Loess Plateau. Geochemistry, Geophysics, Geosystems 7, doi: 10.1029/2006GC001287, 2006.
Sun, Y., Clemens, S.C., An, Z., Yu, Z., Astronomical timescale and paleoclimatic implication of stacked 3.6-Myr monsoon records from the Chinese Loess Plateau. Quaternary Science Reviews, 25, 33-48, 2006.
Clemens, S.C., Prell, W.L., and Sun, Y., Reconciling cave, marine, and loess proxies for summer-monsoon strength at the precession band, Quaternary Science Reviews, In review.
Within the Earth System History Group (ESH) I use the marine and terrestrial geologic record to understand the history and dynamics of global climate and environmental change, with an emphasis on the Indian and Asian monsoon systems. Along with other ESH faculty and students, I develop and apply sedimentological, geochemical, organic geochemical, and microfossil proxies to marine and terrestrial sediments to investigate climate change on time scales ranging from centennial to millions of years
INORGANIC STABLE ISOTOPE FACILITY
I run an inorganic stable isotope facility primarily dedicated to the measurement of the stable isotopes of carbon and oxygen on inorganic carbonates. The facility accommodates projects both internal and external to Brown including analysis of marine sediments from a global array of sites, corals, bivalves, speleothems and lake sediments. The vast majority of samples analyzed are funded through external grants but I also facilitate a significant number of unfunded, exploratory, analyses to help construct proof-of-concept data sets in preparation for proposals.
Clemens and Prell. Collaborative Research: Pliocene and Pleistocene transient climate simulations and model-proxy comparisons for surface temperature and monsoon circulation. NSF Marine Geology and Geophysics, 2011-2013.
Clemens. A Hydrogen Isotopic Approach to Resolving Precipitation Seasonality: Application to East Asian Speleothem Oxygen Isotopes, NSF Atmospheres, Marine Geology and Geophysics, 2010-2013.
Clemens and Prell, Collaborative Research into Indo-Asian Monsoon Variability: Data and Model Assessment of Northern- and Southern-Hemisphere Mechanisms.
Clemens and Prell, East Asian Monsoon History: Testing Hypotheses of Monsoon Response in the South China Sea.
Prell and Clemens. A Stable Isotope Ratio Mass Spectrometer (SIRMS) for Carbonate-Based Paleoceanographic Studies at Brown University, National Science Foundation.
Clemens and Prell. Variability of Monsoon Winds as Recorded in the Eolian Component of Arabian Sea Sediments, National Science Foundation.
Prell and Clemens. Evolution of the Indian Ocean Monsoon and Arabian Sea Upwelling: Orbital, Oceanic, and Tectonic Factors. National Science Foundation.
Clemens, Farrell, and Gromet. A Detailed 0 - 7 Ma 87Sr/86Sr Record from the Bay of Bengal: Implications for Chronostratigraphy and the Seawater Sr Budget. National Science Foundation.
Clemens. Lithogenic Response to Seasonal Monsoon Forcing: Proxy Evaluation and Calibration. National Science Foundation.
Clemens. Establishing the Phase of the Pliocene Astronomical Time Scale Relative to Orbital Forcing. National Science Foundation.
Clemens and Prell. Evolution and Variability of the Asian Monsoon, Joint Oceanographic Institutions (JOI)/USSSP.
American Geophysical Union
American Association of Petroleum Geologists
Geological Society of America
Teaching efforts have focused largely on Introduction to Oceanography (GEOL0070), which ranges from 50 to 70 students each term. We cover the typical aspects of chemical, physical, and biological oceanography as well as the role of the ocean in the carbon cycle as it pertains to climate change. Other teaching opportunities have included GEOL2350 (Quaternaty Climate Seminar) and GEOL 2910E (Miocene Climate Seminar).
Current Graduate Students:
GEOL 0070 - Introduction to Oceanography. Spring 2015, Spring 2016, Spring 2017.