Timothy M Shanahan
Dr. Shanahan's primary area of research is in paleoclimatology and environmental change, with a focus on using novel geochemical and isotopic approaches to reconstruct past global changes from the sedimentary geological record. The goal of this research is to understand the processes controlling past environmental and paleoclimate change. Current projects focus on understanding the linkages between climate change and ecosystem dynamics on timescales ranging from annual (i.e., varves) to orbital and at sites ranging from the tropics to the high latitudes.
Dr. Shanahan's laboratory methods include organic geochemical (biomarker) and compound-specific stable isotope analysis, scanning m-XRF analysis of trace elements in geological archives (sediments, carbonates, tree rings), development of high-resolution paleoenvironmental records from annually laminated sediments and cosmogenic nuclide surface exposure dating. He is interested in utilizing multi-proxy geochemical approaches to understanding environmental changes preserved in the geological record, and in integrating paleoclimate data and modeling approaches to understand the earth system.
Dr. Shanahan's laboratory is currently under construction, but will soon contain a new designated GC-IRMS system for compound-specific hydrogen and carbon isotope analysis, as well as GC-MS and HPLC-MS systems for the identification and quantification of organic compounds in natural samples. The laboratory will also contain various facilities for the preparation and purification of lipid extracts for analysis. Additional facilities will also be available for processing of samples for cosmogenic nuclide analysis and for the study of annually- laminated sediments.
Dr. Shanahan is happy to speak with motivated prospective graduate students.
Areas of Expertise
Paleoclimatology, paleoceanography, paleolimnology, sedimentary geology and geochemistry, organic geochemistry, isotope geochemistry, compound-specific stable isotope analysis
Kavli Fellow - National Academy of Sciences (2012)
NOAA Climate & Global Change Postdoctoral Fellowship - NOAA (2006)
Woods Hole Oceanographic Institution Postdoctoral Fellowship - Woods Hole Oceanographic Institution (2006)
NSF-IGERT research traineeship in Anthropology (2003)
McGinnies Fellowship for Arid Lands Studies, U. Arizona (2002)
NSF research traineeship in hydrology (1997)
Outstanding Graduating Senior, Dept. of Geosciences, Brown U. (1994)
National Association Of Geology Teachers Undergraduate Award (1994)
Sigma Xi (1994)
Chijun (CJ) Sun
, Ph.D., expected 2021
I am interested in understanding how the climate system responds to different forcings and under varying background climate states, with the goal of improving our predictions of future climate changes. My PhD research is focused on the use of organic geochemical (GDGTs, leaf wax) and stable isotope (C, H) proxies to reconstruct changes in climate in northeastern Mexico and the...
, Ph.D., expected 2021
1. Shale sedimentology: transportation and deposition processes and mechanisms of the mudrock system. 2. Shale petrography: textural variation, mineral composition, grain assemblages composition, pore types, and diagenetic features. 3. Sedimentary geochemistry: trace metals used as proxies for paleoenvironmental and paleomarine system reconstructions (e.g., hydrographic circulation, seawater chemistry, productivity, and redox conditions). 4. Unconventional hydrocarbon resources: mechanisms of organic...
Peter E Carlson
, Ph.D., expected 2018
Stalagmites that grow near the entrances of caves are often avoided for the purposes of paleoclimate reconstruction, due to worries about fluctuating atmospheric conditions and microbiological influences interfering with calcite growth dynamics. I study how these near-entrance stalagmites might serve as high-resolution records of surface temperature. I am investigating temperatures and hydrological conditions recorded in the oxygen-isotope and trace...
Veronica J Anderson
, Ph.D., expected 2015
My research focuses on understanding the tectonic history of the Eastern Cordillera using a variety of methods, with an emphasis on using paleoclimatic proxies to understand the effects of surface uplift on Colombian climate. I have utilized organic geochemical proxies for paleotemperature (the MBT/CBT index) and for the isotopic composition of rainfall (hydrogen isotopes in leaf waxes) in order...
Travis Z Wicks , M.S., expected 2013 (Supervisor)
Erin M Keenan Early
My research explores the use of geomolecular and biomolecular methodologies to address paleoenvironmental and paleoecological questions. Specifically I am researching the use of proteomics as applied to faunal material as a means of species identification and I am exploring the applications of brGDGTs recovered from various sources to aid in paleotemperature reconstruction. My work is largely restricted to the Quaternary,...
I am interested in using organic biological markers (biomarker) and stable isotope geochemistry to understand past changes in the climate on a variety of timescales. My Ph.D. research focuses on using branched glycerol dialkyl glycerol tetraethers (br-GDGTs) and hydrogen isotopes in leaf waxes of terrestrial plants in finely laminated lacustrine sediments from the North Island of New Zealand to generate...
Megadroughts in the tropics: insights from the geological record, National Academy of Sciences Kavli Symposium: Indonesia, Solo, Indonesia (2012)
New constraints on the use of IP25 as a paleo-sea ice proxy, First workshop of the PAGES Sea Ice Proxy (SIP) working group on the basis of sea ice proxies, Montreal (2012)
Megadroughts, abrupt climate changes and ecosystem feedbacks in the West African monsoon, Lamont-Doherty Earth Observatory, New York (2011)
Ecosystem feedbacks and changes in the West African monsoon, University of Rochester, Rochester, NY (2011)
Abrupt climate change and ecosystem feedbacks in the West African monsoon, Syracuse University, Syracuse, NY (2011)
Abrupt climate change and ecosystem feedbacks in the West African monsoon, Texas Marine Science Institute, Port Aransas, TX (2011)
Megadroughts, abrupt climate changes and ecosystem feedbacks in the West African monsoon, The Open University, Milton Keynes, UK (2011)
ICDP Drilling at Lake Bosumtwi: Progress and challenges, Workshop on drilling of East African Lakes, Brown University, RI (2011)
Late Holocene megadroughts and temperature changes in the tropics: coherent century-scale climate variability across the tropics, American Geophysical Union annual meeting, San Francisco, CA (2011)
Lakes as archives of environmental change in Southeast Asia, Greater Mekong Delta meeting, Cambodia (2010)
Two millennia of climate change in tropical West Africa: a review., First workshop of the PAGES Africa 2k working group, Ghent, Belgium (2010)
|2019||Fall||GEO 303||Introduction To Geology|
|2019||Spring||GEO 303||Introduction To Geology|
|2018||Fall||GEO 303||Introduction To Geology|
|2018||Spring||GEO 394||Rsch In Geological Sciences|
|2018||Spring||GEO 291||Paleoclimate Seminar|
|2018||Spring||GEO 303||Introduction To Geology|
|2017||Fall||GEO 394||Rsch In Geological Sciences|
|2017||Fall||GEO 291||Paleoclimate Seminar|
|2017||Fall||GEO 303||Introduction To Geology|
|2017||Spring||GEO 394||Rsch In Geological Sciences|
|2017||Spring||GEO 291||Paleoclimate Seminar|
|2017||Spring||GEO 303||Introduction To Geology|
|2016||Fall||GEO 394||Rsch In Geological Sciences|
|2016||Fall||GEO 191||Paleoclimate Topics Seminar|
|2016||Fall||GEO 303||Introduction To Geology|
|2016||Spring||GEO 291||Current Topics Paleoclimate|
|2016||Spring||GEO 303||Introduction To Geology|
|2015||Fall||GEO 303||Introduction To Geology|
|2015||Spring||GEO 302C||Climate: Past, Present, Future|
|2014||Fall||GEO 394||Rsch In Environmental Change|
|2014||Fall||GEO 303||Introduction To Geology|
|2014||Spring||GEO 302C||Climate: Past, Present, Future|