Geochemistry

The Geochemistry faculty study a wide range of processes and interactions, including products of large-scale Earth differentiation, such as the composition, evolution and age of the mantle and core, the formation and evolution of oceanic and continental crust, interactions between the geochemical environment (soil, water, air) and human health, fundamental questions involving the oceans and continental water systems, global geochemical cycles involving the atmosphere, oceans and Earth's interior, natural and engineered methods for carbon capture and storage, and using a wide range of geochemical archives to understand how and why the ocean and climate have changed at timescales ranging from seasons to millions of years. The faculty has developed strong collaborations with Columbia University engineers, biologists, public health researchers and American Museum of Natural History petrologists, planetary geologists and paleontologists.

Peter Schlosser
Personal Information
Peter
Schlosser
Professor
Earth and Environmental Sciences
Geochemistry
Vinton Professor of Earth and Environmental Engineering
Earth and Environmental Sciences
Contact Information
139 Comer
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US

Fax: 

(845) 365-8176

Fields of interest: 

Aqueous Geochemistry, Physical Oceanography, Climate, Contaminant Transport.

My research focuses on the application of noble gases and other isotopes to natural systems with emphasis on the oceans and groundwater. My research is directed to understanding the natural state of these water bodies, the human perturbation of the natural state, and the possibility to design engineering solutions to the problems caused by human impact. The problems we are working on range from basic studies of circulation patterns of water in the ocean and groundwater flow systems to the variability of the oceanic circulation under natural and anthropogenically forced conditions or the transport and transformation of contaminants. Other projects include paleoclimate and paleocirculation studies.

For most of our studies, we use trace substances of natural or anthropogenic origin (isotopes or chemical compounds). In some cases we follow the penetration of such substances into the water bodies of interests in a fashion that is similar to dye experiments, but on a much larger scale. In other cases, we use combinations of isotopes as ?radioactive clocks? (e.g., tritium, the radioactive isotope of hydrogen, and its decay product, the noble gas isotope 3He). In some cases, we deliberately inject small amounts of inert trace gases into specific water bodies (e.g., the Hudson River) and study their spreading and mixing. Such experiments provide the closest analogues to the spreading of contaminants in the environment.

In many cases, we combine our experimental work with modeling studies to understand the underlying physics of the circulation or to explore predictability. Modeling studies also provide insight into management options for certain water bodies.

Some of my projects include:

 

Education
Ph.D.
Heidelberg
1985
Selected Publications:
Decrease of river runoff in the upper waters of the Eurasian Basin, Arctic Ocean, between 1991 and 1996: Evidence from delta O-18 data, Schlosser, P.; Newton, R.; Ekwurzel, B.; Khatiwala, S.; Mortlock, R.; Fairbanks, R. Geophysical Research Letters May 1, Volume: 29, Issue: 9 p.: - (2002) Doi 10.1029/2001gl013135
Determination of longitudinal dispersion coefficient and net advection in the tidal Hudson River with a large-scale, high resolution SF6 tracer release experiment, Ho, D. T.; Schlosser, P.; Caplow, T. Environmental Science & Technology Aug 1, Volume: 36, Issue: 15 p.: 3234-3241 (2002) UNSP ES015814+
Excess helium and neon in the southeast Pacific: Tracers for glacial meltwater, Hohmann, R.; Schlosser, P.; Jacobs, S.; Ludin, A.; Weppernig, R. Journal of Geophysical Research-Oceans Nov, Volume: 107, Issue: C11 p.: - (2002) Doi 10.1029/2000jc000378
Md. Rajib Mozumder
Personal Information
Md. Rajib
Mozumder
Graduate Student
Earth and Environmental Sciences
Geochemistry
Contact Information
215 Comer
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
(845) 365-8302

Fax: 

(845) 365-8155

Fields of interest: 

hydrogeology, groundwater geochemistry, groundwater resources management
Education
M.Phil. in Groundwater geochemistry
Columbia University
2014-2016
M.A. in Groundwater geochemistry
Columbia University
2012-2014
B.S. in Geology; M.S. in Hydrogeology
University of Dhaka
2002-2010
Degree Project in Groundwater Chemistry
Royal Institute of Technology (KTH)
2010-2011
Sidney R. Hemming
Personal Information
Sidney
R.
Hemming
Professor and Chair
Earth and Environmental Sciences
Geochemistry
Contact Information
413 Comer
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
(845) 365-8417

Fax: 

(845) 365-8155

Fields of interest: 

geochronology, sedimentary geochemistry, paleoclimate, continental crust evolution

I consider my field to be Historical Geology.  Using the record from sediments and sedimentary rocks, I seek to document aspects of Earth's history.  Understanding the provenance and processes recorded in the geochemistry of sediments and sedimentary rocks lies at the heart of my research interests.  I have strong interest in 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.  Geochronology is essential to my research and I am actively participating in projects to improve our ability to obtain reliable age estimates on events in Earth's history.

  • Ar Geochronology Lab
Education
Ph.D.
SUNY Stony Brook
1994
Master of Science
Tulane
1986
Bachelor of Science
Midwestern
1983
Marissa Tremblay, Barnard College Senior
Selected Publications:
Characterizing the sediment provenance of East Antarctica's weak underbelly: The Aurora and Wilkes sub-glacial basins, Pierce, Pierce, E.L.; Williams T.; van de Flierdt, T.; Hemming, S.R.; Goldstein, S.L.; Brachfeld, S.A. Paleoceanography, Volume: 26, Issue: PA4217 p.: 10.1029/2011PA002127 (2011)
Evidence for iceberg armadas from East Antarctica in the Southern Ocean during the late Miocene and early Pliocene, Williams, T; van de Flierdt, T; Hemming, SR; Chung, E; Roy, M; Goldstein, SL Earth and Planetary Science Letters, Volume: 290 p.: 351-361 (2010)
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
Use of strontium isotopes in detrital sediments to constrain the glacial position of the Agulhas Retroflection, Franzese, A. M.; Hemming, S. R.; Goldstein, S. L. Paleoceanography, Volume: 24 (2009) 10.1029/2008PA001706
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)
Maureen Raymo
Personal Information
Maureen
Raymo
Bruce C. Heezen/Lamont Research Professor
Lamont-Doherty Earth Observatory
Biology and Paleo Environment
Adjunct Professor
Earth and Environmental Sciences
Director - Core Repository
Lamont-Doherty Earth Observatory
Contact Information
105E Geoscience
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
(845) 365-8801

Fax: 

(845) 365-8150
Selected Publications:
Departures from eustasy in Pliocene sea-level records, Raymo, Maureen E.; Mitrovica, Jerry X.; O'Leary, Michael J.; DeConto, Robert M.; Hearty, Paul L. NATURE GEOSCIENCE MAY, Volume: 4 p.: 328–332 (2011)
Diachronous benthic delta O-18 responses during late Pleistocene terminations, Lisiecki, Lorraine E.; Raymo, Maureen E. PALEOCEANOGRAPHY SEP 23, Volume: 24 p.: PA3210 (2009)
Plio-Pleistocene Ice Volume, Antarctic Climate, and the Global δ18O Record, Raymo, M. E., L. E. Lisiecki, and K. H. Nisancioglu Science, Volume: 313 p.: 492 (2006)
A Pliocene-Pleistocene stack of 57 globally distributed benthic delta O-18 records, Lisiecki, L. E.; Raymo, M. E. PALEOCEANOGRAPHY JAN 18, Volume: 20 p.: PA1003 (2005)
The 41 kyr world: Milankovitch's other unsolved mystery, Raymo, M. E.; Nisancioglu, K. PALEOCEANOGRAPHY MAR 6, Volume: 18 p.: 1011 (2003)
The timing of major climate terminations, Raymo, M. E. PALEOCEANOGRAPHY AUG, Volume: 12 p.: 577–585 (1997)
THE HIMALAYAS, ORGANIC-CARBON BURIAL, AND CLIMATE IN THE MIOCENE, RAYMO, ME PALEOCEANOGRAPHY JUN, Volume: 9 p.: 399–404 (1994)
Tectonic forcing of late Cenozoic climate, Raymo, M.E. and W.F. Ruddiman Nature, Volume: 359 p.: 117-122 (1992)
Evolution of Atlantic Pacific Delta-C-13 Gradients over the Last 2.5 My, Raymo, M. E.; Ruddiman, W. F.; Shackleton, N. J.; Oppo, D. W. Earth and Planetary Science Letters Mar, Volume: 97, Issue: 3-4 p.: 353-368 (1990)
Bärbel Hönisch
Personal Information
Bärbel
Hönisch
Associate Professor
Earth and Environmental Sciences
Geochemistry
Contact Information
229 Comer
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
(845) 365-8828

Fax: 

(845) 365-8155

Fields of interest: 

Paleoclimatology, Paleoceanography, Biological Oceanography

My main interest is focussed on the understanding and reconstruction of past marine carbonate chemistry. Specifically, I seek to validate and apply the boron isotope proxy for past seawater pH. The methods used for the validation work are culture experiments with living planktic foraminifers, as well as observations on planktic and benthic foraminifers from coretop sediments, and now also bamboo corals. Specifically I studied the influence of symbiont photosynthesis on the pH recorded by planktic foraminifers (Hönisch et al., 2003) and scleractinian corals (Hönisch et al., 2004). The boron isotopic composition of symbiont-bearing planktic foraminifers also changes with foraminiferal shell size, as it appears that larger individuals spend relatively more time closer to the seasurface where light levels are higher and symbiont photosynthesis is stronger (Hönisch and Hemming, 2004). In the latter study we also describe a significant post-depositional dissolution effect on the boron isotopic composition in foraminifera shells. Although these side effects are significant, the detailed knowledge of these proxy limitations now allows us to carefully select sample material for paleoreconstructions. I am currently applying the boron isotope proxy to reconstruct ocean acidification across the Paleocene/Eocene Thermal Maximum.

The B/Ca proxy for marine carbonate chemistry is fairly new and we continue to test it in culture experiments Allen et al., 2011, Allen et al., 2012), where we can control environmental conditions. I am also particularly interested in testing proxy relationships of times when the minor and trace element composition of seawater was different from today.

Some of my projects include:

  • Testing Geochemical proxy relationships under variable paleo-seawater chemical conditions
  • Reconstructing surface ocean acidification at the PETM
  • Validating the boron isotope proxy in deep-sea corals and tracing anthropogenic CO2 invasion
Education
Ph.D.
Alfred Wegener Institute for Polar and Marine Research (AWI) and University of Bremen
2002
Diplom (equal to MS)
University of Bremen
1999
Vordiplom (equal to BA)
University of Bielefeld
1995
Caroline Baptist
Selected Publications:
The influence of salinity on Mg/Ca ratios of cultured and core-top planktic foraminifers, Hönisch, B., K.A. Allen, D.W. Lea, H.J. Spero, S.M. Eggins, J. Arbuszewski, P. deMenocal, Y. Rosenthal, A.D. Russell Geochimica et Cosmochimica Acta, Volume: 121 p.: 196-213 (2013) 10.1016/j.gca.2013.07.028
The Geological Record of Ocean Acidification, Hönisch, B.; A. Ridgwell; D.N. Schmidt; E. Thomas; S.J. Gibbs; A. Sluijs; R.E. Zeebe; L. Kump; R.C. Martindale; S.E. Greene; W. Kiessling; J. Ries; J. Zachos; D.L. Royer; S. Barker; T.M. Marchitto Jr.; R. Moyer; C. Pelejero; P. Ziveri; G.L. Foster; and B. Science, Volume: 335, Issue: 1058 (2012)
Atmospheric Carbon Dioxide Concentration over the Mid Pleistocene Transition, Hönisch, B.; Hemming, N.G.; Archer, D.; Siddall, M.; McManus, J.F. Science, Volume: 324 p.: 1551-1554 (2009)
Rachel Marzen
Personal Information
Rachel
Marzen
Graduate Student
Earth and Environmental Sciences
Marine Geology and Geophysics
Contact Information
302C Oceanography
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US

Fax: 

(845) 365-8156
Education
BS
Rice University
05/2015
Selected Publications:
Calcareous microfossil-based orbital cyclostratigraphy in the Arctic Ocean, Marzen, Rachel E.; DeNinno, Lauren H.; Cronin, Thomas M. Quaternary Science Reviews, Volume: 149 (2016) 10.1016/j.quascirev.2016.07.004
Late Holocene sea level variability and Atlantic Meridional Overturning Circulation, Cronin, T. M.; Farmer, J. R.; Marzen, R. E.; Thomas, E.; Varekamp, J. C. Paleoceanography, Volume: 29 (2014) 10.1002/2014PA002632
SONYA DYHRMAN
Personal Information
Sonya
Dyhrman
Associate Professor
Earth and Environmental Sciences
Biology and Paleo Environment
Contact Information
102E Geoscience
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
(845) 365-8165

Fax: 

(845) 365-8163

I am broadly interested in how marine microbes like phytoplankton interact with their geochemical environment, where I use molecular level tools to study the intersection of microbial physiology and biogeochemistry.

Microbial oceanography group members are using a suite of genome-enabled approaches to examine the distribution and activities of marine phytoplankton, and how they influence cycling of carbon, nitrogen and phosphorus. Our work often uses model cultures to understand and bound field observations made on research cruises that span the from polar to tropical systems. This research emphasis provides advanced training for undergraduates, graduate students, and postdoctoral scholars and it is also used as a framework for the development and implementation of inquiry-based educational activities for children.

Education
Ph.D.
Scripps Institution of Oceanography, University of California San Diego
11/1999
B.A.
Dartmouth College
06/1994
William D'Andrea
Personal Information
William
D'Andrea
Lamont Associate Research Professor
Lamont-Doherty Earth Observatory
Biology and Paleo Environment
Contact Information
205D Geoscience
61 Route 9W - PO Box 1000
Palisades
NY
10964
US
(845) 365-8654

Fax: 

(845) 365-8150

My research is geared toward understanding global climate change, including current anthropogenic driven changes and past changes to the Earth System.  I investigate the natural modes and underlying forcing mechanisms of past climate variability, with the goal of developing a better understanding of how the Earth System responds to natural and human-induced perturbations.

Education
PhD
Brown University
05/2008
MSc
Brown University
05/2005
BS/BA
Binghamton University
05/2002
Thesis committee member of Laura B. Levy (Dartmouth College)
Thesis committee member of David Vaillencourt (Northern Arizona University)
Selected Publications:
Biogeochemical evidence for hydrologic changes during the Holocene in a lake record from southeast Greenland, Balascio, N.L.; D'Andrea, W.J.; Bradley, R.S.; Perren, B.B. The Holocene, Volume: 23 p.: 1428-1439 (2013) 10.1177/0959683613493938
The influence of 14C reservoir age on interpretation of paleolimnological records from the Tibetan Plateau, Hou, J; D'Andrea, W.J.; Liu, Z. Quaternary Science Reviews 07/2012, Volume: 48 p.: 13 (2012)
Proxy-to-proxy calibration: Increasing the temporal resolution of quantitative climate reconstructions, von Gunten, L; D'Andrea, W.J.; Bradley, R.S.; Huang, Y. Scientific Reports 08/2012, Volume: 2, Issue: 609 p.: 6 (2012) 10.1038/srep00609
Mild Little Ice Age and unprecedented recent warmth in an 1800 year lake sediment record from Svalbard, D'Andrea, W.J.; Vaillencourt, D.A.; Balascio, N.L.; Werner, A.; Roof, S.R.; Retelle, M.; Bradley, R.S. Geology, Volume: 40, Issue: 11 p.: 1007-1010 (2012) 10.1130/G33365.1
Abrupt Holocene climate change as an important factor for human migration in West Greenland, D'Andrea, William J.; Huang, Yongsong; Fritz, Sherilyn C.; Anderson, N. John PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA JUN 14, Volume: 108 p.: 9765–9769 (2011)
Phylogenetic diversity and evolutionary relatedness of alkenone-producing haptophyte algae in lakes: Implications for continental paleotemperature reconstructions, Theroux, Susanna; D'Andrea, William J.; Toney, Jaime; Amaral-Zettler, Linda; Huang, Yongsong EARTH AND PLANETARY SCIENCE LETTERS DEC 1, Volume: 300 p.: 311–320 (2010)
Holocene carbon burial by lakes in SW Greenland, Anderson, N. J.; D'Andrea, W.; Fritz, S. C. GLOBAL CHANGE BIOLOGY NOV, Volume: 15 p.: 2590–2598 (2009)
Can sedimentary leaf waxes record D/H ratios of continental precipitation?: Field, model, and experimental assessments, Hou, Juzhi; D'Andrea, William J.; Huang, Yongsong GEOCHIMICA ET COSMOCHIMICA ACTA JUL 15, Volume: 72 p.: 3503–3517 (2008)
Evidence for water use efficiency as an important factor in determining the delta D values of tree leaf waxes, Hou, Juzhi; D'Andrea, William J.; MacDonald, Dana; Huang, Yongsong ORGANIC GEOCHEMISTRY, Volume: 38 p.: 1251–1255 (2007)
Hydrogen isotopic variability in leaf waxes among terrestrial and aquatic plants around Blood Pond, Massachusetts (USA), Hou, Juzhi; D'Andrea, William J.; MacDonald, Dana; Huang, Yongsong ORGANIC GEOCHEMISTRY, Volume: 38 p.: 977–984 (2007)
An efficient method for isolating individual long-chain alkenones for compound-specific hydrogen isotope analysis, D'Andrea, William J.; Liu, Zhonghui; Alexandre, Marcelo Da Rosa; Wattley, Sarah; Herbert, Timothy D.; Huang, Yongsong ANALYTICAL CHEMISTRY MAY 1, Volume: 79 p.: 3430–3435 (2007)
Alkenone producers inferred from well-preserved 18S rDNA in Greenland lake sediments, D'Andrea, William J.; Lage, Melissa; Martiny, Jennifer B. H.; Laatsch, Abby D.; Amaral-Zettler, Linda A.; Sogin, Mitchell L.; Huang, Yongsong JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES SEP 19, Volume: 111 p.: G03013 (2006)
Long chain alkenones in Greenland lake sediments: Low delta C-13 values and exceptional abundance, D'Andrea, W. J.; Huang, Y. ORGANIC GEOCHEMISTRY, Volume: 36 p.: 1234–1241 (2005)
Braddock Linsley
Personal Information
Dr.
Braddock
Linsley
Lamont Research Professor
Lamont-Doherty Earth Observatory
Biology and Paleo Environment
Contact Information
104E Geoscience
61 Route 9W - PO Box 1000
Palisades
NY
10964
US
(845 365-8306

Fax: 

(845) 365-8150

Fields of interest: 

Coral-based paleoclimatology in the Indo-Pacific, Sediment records of Western Pacific Warm Pool and Indonesian Throughflow variability
Education
Ph.D. Geology
University of New Mexico
1990
M.S. Geology
University of South Carolina
1984
B.S. Geology
St. Lawrence University
1982
Dr. Logan Brenner (now Frontiers of Science postdoc at Columbia)
Dr. Emilie Dassie; former SUNYA grad student and post doctoral scientist at LDEO
Selected Publications:
SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region, Linsley, Braddock K.; Wu, Henry C.; Rixen, Tim; Chales, Christopher D.; Gordon, Arnold L.; Moore, Michael D. Geophysical Research Letters (2017)
Decadal changes in South Pacific sea surface temperatures and the relationship to the Pacific decadal oscillation and upper ocean heat content, Linsley, Braddock K.; Wu, Henry C.; Dassie, Emilie P.; Schrag, Daniel P Geophysical Research Letters 04/2015, Volume: 42 p.: doi:10.1002/2015GL063045. (2015)
The Suess effect in Fiji coral ?13C and its potential as a tracer of anthropogenic CO2 uptake., Dassie, Emilie P; Lemley, GM, Linsley, BK Palaeogeography, Palaeoclimatology, Palaeoecology (2013) 10.1016/j.palaeo.2012.11.012
Oceanographic variability in the South Pacific Convergence Zone region over the last 210 years from multi-site coral Sr/Ca., Wu, Henry C; Linsley, BK; Dassie,EP, Schiraldi, B; deMenocal,PB Geochemistry, Geophysics, Geosystems (2013)
Holocene Evolution of the Indonesian Throughflow and the Western Pacific Warm Pool, Linsley, B.K.; Y. Rosenthal; D. W. Oppo, Nature Geoscience 2010, Volume: 3 p.: 578-583 (2010)
Beizhan Yan
Personal Information
Beizhan
Yan
Lamont Associate Research Professor
Lamont-Doherty Earth Observatory
Geochemistry
Contact Information
203 Comer
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
(845) 365-8448

Fax: 

(845) 365-8155

Fields of interest: 

Aqueous Geochemistry, Organic Geochemistry, Environmental Exposure and Health, and Environmental Science

My research is mainly focused on two areas: 1) characterizing exposure of pollutants and investigating adverse health effects of these pollutants in urban environments and 2) apportioning contamination sources and assessing environmental impact related to human activities (e.g., the fate of contaminants after Deepwater Horizon Oil Spill and impact of hydraulic fracturing on water and air quality).

The ability to unambiguously identify and measure trace organics is a prerequisite for testing mechanisms that impact their behavior and fate.  At LDEO, I have established an organic geochemistry laboratory from scratch with the ability to extract organic contaminants from environmental samples (waters, soils, sediments, aerosols) and biological samples (e.g., fish tissue and human exhaled breath condensate), to conduct purification and separation of organics of interest from the complex mixtures and matrices, and to identify and quantify those compounds using modern chromatography techniques. As I have built up these abilities at LDEO, I have continued my research in Environmental Geochemistry (e.g., source apportionment in the NY metropolitan area) and expanded into other areas, including tracing spilled oil in Gulf of Mexico, bioaccumulation and bioavailability of PAHs, bioremediation of contaminated soil/sediments, and the relationships between indoor and personal exposures to these contaminants and adverse respiratory outcomes related to the exposure among children living in NYC and Beijing, China. 

Education
Ph.D
Rensselaer Polytechnic Institute, Troy, NY
08/2004
M.S.
Nanjing University, China
06/1997
B.S.
Nanjing University, China
06/1994

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