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Thomas Bullen

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Short Biography

I have been with the National Research Program of the USGS  Water Mission Area since 1990, and am the organization's resident expert in the analysis and application of metal and metalloid isotopes for hydrologic, biogeochemical and environmental research. My technical training is in the fields of fluid mechanics (B.A. degree) and igneous geochemistry (Ph.D degree), which combined with my diverse research experiences while at the USGS has resulted in a strong inter-disciplinary approach to my science. I have long-standing interests in the science of small watersheds, large aquifers, contaminant transport and fate, human health and biogeochemical tracing techniques in general. My current research is focused on developing novel metal stable isotope tracing techniques to understand hydropedologic processes in forested watersheds and to determine the sources, transport mechanisms and fates of metals deposited on those watersheds as dust.

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Bullen, T.D., 2011, Stable isotopes of transition and post-transition metals as tracers in environmental studies. In Handbook of Environmental Isotope Geochemistry, Advances in Isotope Geochemistry (M. Baskaran, ed.), Springer-Verlag. Pp. 177-203. [Download File]

Bullen, T.D. & Walczyk, T.R., 2009, Environmental and biomedical applications of metal stable isotopes. Elements, v.5, pp. 381-385 (T.D. Bullen and A. Eisenhauer, eds). [Download File]

Bullen, T.D. & Bailey, S.W., 2005, Identifying calcium sources at an acid deposition-impacted spruce forest: a strontium isotope, alkaline earth element multi-tracer approach. Biogeochemistry, v.74, n.1, pp. 63-99. [Download File]

Bullen, T.D., White, A.F., Childs, C.W., Vvit, D.V. & Schulz, M.S., 2001, Demonstration of significant abiotic iron isotope fractionation in nature. Geology, v.29, n.8, pp. 699-702 [Download File]

Bullen, T.D., Krabbenhoft, D.P. & Kendall, C., 1996, Kinetic and mineralogic controls on the evolution of groundwater chemistry and 87Sr/86Sr in a sandy silicate aquifer, northern Wisconsin, USA. Geochemica et Cosmohimca Acta, v.60, n.10, pp. 1807-1821. [Download File]


My Science Topics

Science Topic
Ecology and Environmentecological processes
Ecology and Environmentecosystem functions
Ecology and Environmentenvironmental assessment
Ecology and Environmentforests
Earth Characteristicsigneous rocks
Environmental Issuescontamination and pollution
Environmental Issuesground-water quality
Environmental Issueshealth and disease
Environmental Issueshuman impacts
Environmental Issuesindustrial pollution
Environmental Issuessurface water quality
Environmental Issuestoxic trace elements
Environmental Issueswaste treatment and disposal
Geologic Processesgeochemistry
Geologic Processessoil chemistry
Geologic Processeswater chemistry
Hydrologic Processeshydrology
Hydrologic Processessaltwater intrusion
Techniques and Methodsisotopic analysis
Techniques and Methodslaboratory methods
Techniques and Methodstree ring analysis
Water Resourcesaquifers
Water Resourcesground-water quality
Water Resourcessurface water quality

My USGS Science Strategy Areas

A Water Census of the United States

Climate Variability & Change

The Role of Environment and Wildlife in Human Health

Understanding Ecosystems & Predicting Ecosystems Change

Contact Information

Thomas Bullen
345 Middlefield Road
Menlo Park, CA 94025
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