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John Karl Bohlke

Research Hydrologist

Contact Info


Short Biography

BS (Geology), University of Michigan, Ann Arbor, Michigan

 

Cartographer, US Soil Conservation Service, Hyattsville, Maryland

MS (Marine Geology), Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Florida

Geologist, Western Mineral Resources, US Geological Survey, Menlo Park, California

 

PhD (Geology and Geophysics), University of California, Berkeley, California

 

Postdoc (Geoscience), Argonne National Laboratory, Chicago, Illinois

 

Geologist, Eastern Mineral Resources, US Geological Survey, Reston, Virginia

 

Hydrologist, National Research Program, US Geological Survey, Reston, Virginia (since 1991)

 

[Adjunct Assist/Assoc Professor (Geology), University of Maryland (since 1992)]

 

 





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My Science Topics


Science Topic
Subtopic
Environmental Issuesnonpoint-source pollution
Environmental Issuesland use change
Environmental Issuesground-water quality
Environmental Issuescontamination and pollution
Water Resourceswater quality
Water Resourcessurface water quality
Water Resourcesmovement and recharge
Water Resourcesground-water quality
Environmental Issuessurface water quality
Environmental Issueswaste treatment and disposal
Environmental Issueswater quality
Hydrologic Processeshydrology
Techniques and Methodsfield methods
Techniques and Methodsisotopic analysis
Techniques and Methodslaboratory methods
Techniques and Methodsmathematical simulation



My USGS Science Strategy Areas

Understanding Ecosystems & Predicting Ecosystems Change

The Role of Environment and Wildlife in Human Health

A Water Census of the United States

Energy & Minerals for America's Future

Hydrogeology and biogeochemistry of reactive inorganic chemicals

Conducting field and laboratory research on physical and biogeochemical processes affecting the distribution of reactive inorganic constituents in groundwater and surface water, with focus on redox sensitive compounds of oxygen, nitrogen, carbon, sulfur, etc.  Recent studies include sources, movement, and fate of nutrients and contaminants (e.g., nitrate, ammonium, sulfate, perchlorate).  


Isotopes and environmental tracers

Developing methods and applications for stable isotopes and other environmental tracers in hydrology and biogeochemistry, including analytical techniques for stable isotopes in compounds separated from groundwater and surface water, stable isotope forensics, enriched isotope tracer experiments to quantify transport and reaction rates, field and laboratory determinations of isotope fractionation factors, numerical modeling of isotope effects during transport and reaction, interpretation of atmospheric tracers in groundwater dating and contaminant transport.


Contact Information

John Karl Bohlke
12201 Sunrise Valley Dr
Reston, VA 20192-0002
jkbohlke@usgs.gov
703-648-6325
703-648-5274 - Fax
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