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Stable Isotope and Tritium Labs

Who's who

Current researchers in the Isotope Tracers team:

KENDALL, Carol (650-329-4576, ckendall@usgs.gov)
Chief of the Isotope Tracers Project. Carol is a 4th generation Californian who got her BS and MS at UC-Riverside, and later her PhD at the University of Maryland while working at the USGS headquarters in Virginia. Since 1990, she has been the head of the Isotope Tracers research project at the USGS regional office in Menlo Park. The purpose of this project is to develop new isotope methods and applications to solve problems of national importance. Her main research focus is tracing sources of nutrients, organics, and water in human-impacted aquatic ecosystems. She is the co-editor of the 1998 book “Isotope Tracers in Catchment Hydrology” and has taught dozens of isotope hydrology short-courses over the past 20 years for the USGS and various federal, state, academic, and international organizations.

MICHEL, Bob (650-329-4547, rlmichel@usgs.gov)
EMERITUS.  Former manager of the Tritium Lab.  Bob's main fields of interest are alpine and arid zone hydrology.

SILVA, Steve (650-329-4538, srsilva@usgs.gov)
Steve divides his time between methods development research, and several research projects related to nutrient sources. Most of his current methods development research has been on devising new ways to expand project analytical capabilities. He is currently focused on tracing nitrate and POM sources in big river systems using a multi-isotope approach.

YOUNG, Megan (650-329-4544, mbyoung@usgs.gov)
Manager of the Tritium Lab.  Megan is an isotope biogeochemist. She received her Ph.D. from the Department of Geological & Environmental Sciences at Stanford University, working in Dr. Adina Paytan’s Chemical Oceanography lab. She is currently working on several different projects using multiple stable isotopes to trace interactions between groundwater, surface water, and anthropogenic nutrient inputs. Her primary research project is the isotope component of a large CALFED study in the San Joaquin River area tracing nutrient and organic matter sources through the river system and linking these to low dissolved oxygen conditions in the Stockton Deep Water Shipping Channel. Megan is also working on using oxygen isotopes of dissolved phosphate to identify different phosphate sources in aquatic ecosystems.                                                

 

Past team members:

BEMIS, Bryan.
Bryan was an isotope geochemist post-doc. His main interests were applying isotopic ratio techniques to solving environmental problems, including using compound specific isotopic ratio techniques for tracing sources of nutrients to the base of aquatic food webs, food chain reconstructions, mercury bioaccumulation, characterizing sources of DOC to wetlands, and correlating THM formation potential with DOC type. He is now a biogeochemist at Applied Marine Sciences, CA.

CHANG, Cecily.
Cecily divided her time between methods development work, and working with WEBB, NAWQA, and other nitrate-related projects. Cecily developed an improved method for collecting and analyzing nitrate for 18O from very dilute, DOC rich waters that was used in many watershed nitrate studies. She is currently focusing on nitrate sources and cycling in big river systems. She has retired from the USGS.

DOCTOR, Dan (dhdoctor@usgs.gov
Dan was an NRC post-doc, and divided his time between working on sources and cycling of carbon (DIC and DOC) at one of the WEBB program sites (Sleepers River VT) using our new automated TIC/TOC analyzer connected to an IsoPrime mass spectrometer, and working on our CALFED-funded projects. He is now a research geologist at the USGS in Reston VA.

ELLIOTT, Emily.
Emily was an isotope biogeochemist post-doc working on our NYSERDA and EPRI-funded project on mapping the nitrate isotopic composition of precipitation across the USA, and in particular the state of NY.  We were testing the hypothesis that nitrate in precipitation derived from emissions from vehicles and power plants might have distinguishable nitrate isotope compositions.  She is now an assistant professor in the geology department of the University of Pittsburgh, in PA.

WANKEL, Scott.
Scott divided his time between managing our laboratory database and helping with method development and ongoing ecological projects, with his thesis work (at Stanford, in collaboration with Adina Paytan). He was especially interested in foodweb ecology at the bottom of the foodweb.  His dissertation focused on nutrient sources and cycling in Monterey Bay. He is now a research scientist at WHOI, MA.

 

There is more information about the "Isotope Tracers" project, including project goals and recent publications, on the NRP homepage.

Related Links

Who's who

Analytical Capabilities

 

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Please contact Carol Kendall (ckendall@usgs.gov) for questions and comments regarding this page.
This page was last changed in July 2014.
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