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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)]

 

 





Publications

Hatzinger, P.B., Böhlke, J.K., and Sturchio, N.C., 2013, Application of stable isotope ratio analysis for biodegradation monitoring in groundwater. Current Opinion in Biotechnology, v. 24(3), p. 542–549. [Link]

Wieser, M.E., Holden, N., Coplen, T.B., Böhlke, J.K., Berglund, M. , Brand, W.A., De Bièvre, P., Gröning, M., Loss, R.D., Meija, J., Hirata, T., Prohaska, T., Schönberg, R., Singleton, G., Walczyk, T., Yoneda, S., and Zhu, X., 2013, Atomic weights of the elements 2011 (IUPAC Technical Report). Pure and Applied Chemistry, v. 85, p. 1047-1078. [Link]

Coupe, R.H., Goolsby, D.A., Battaglin, W.A., Böhlke, J.K., McMahon, P.B., and Kendall, C., 2013, Transport of nitrate in the Mississippi River in July-August 1999. Annals of Environmental Science, v. 7, p. 31-46. [Link]

Evenson, E.J., Orndorff, R.C., Blome, C.D., Böhlke, J.K., Hershberger, P.K., Langenheim, V.E., McCabe, G.J., Morlock, S.E., Reeves, H.W., Verdin, J.P., Weyers, H.S., and Wood, T.M., 2013, U.S. Geological Survey water science strategy—Observing, understanding, predicting, and delivering water science to the nation. U.S. Geological Survey Circular 1383-G, Reston, 49 p. [Link]

Harvey, J.W., Böhlke, J.K., Voytek, M.A., Scott, D.T., Tobias, C.R., 2013. Hyporheic zone denitrification: Controls on effective reaction depth and contribution to whole-stream mass balance. Water Resources Research, v. 49, p. 6298-6316. [Link]

Eberts, S.M., Böhlke, J.K., Kauffman, L.J., and Jurgens, B.C., 2012, Comparison of particle-tracking and lumped-parameter age-distribution models for evaluating vulnerability of production wells to contamination. Hydrogeology Journal, v. 20, p. 263-282. [Link]

Liao, L., Green, C.T., Bekins, B.A., and Böhlke, J.K., 2012, Factors controlling nitrogen fluxes in groundwater in agricultural areas. Water Resources Research, v. 48, W00L09, doi:10.1029/2011WR011008, p. 1-18. [Link]

Jurgens, B.C., Böhlke, J.K., and Eberts, S.M., 2012, TracerLPM (Version 1): An Excel® workbook for interpreting groundwater age distributions from environmental tracer data. U.S. Geological Survey Techniques and Methods Report 4-F3, 60 p. [Link]

Evenson, E.J., Orndorff, R.C., Blome, C.D., Böhlke, J.K., Hershberger, P.K., Langenheim, V.E., McCabe, G.J., Morlock, S.E., Reeves, H.W., Verdin, J.P., Weyers, H.S., and Wood, T.M., 2012, Strategic directions for U.S. Geological Survey water science, 2012–2022—Observing, understanding, predicting, and delivering water science to the Nation. U.S. Geological Survey, Open-File Report 2012-1066, 42 p. [Link]

Harte, P.T., Ayotte, J.D., Hoffman, A., Révész, K.M., Belaval, M., Lamb, S., and Böhlke, J.K., 2012, Heterogeneous redox conditions, arsenic mobility, and groundwater flow in a fractured-rock aquifer near a waste repository site in New Hampshire, USA. Hydrogeology Journal, v. 20, p. 1189–1201. [Link]

Peters, N.E., Böhlke, J.K., Brooks, P.D., Burt, T.P., Gooseff, M.N., Hamilton, D.P., Mulholland, P.J., Roulet, N.T., and Turner, J.V., 2011, Hydrology and biogeochemistry linkages. in Wilderer, P., ed., International Water Association, Treatise on water science, Volume 2 (Hydrology): Academic Press, Oxford, p. 271-304.

Cozzarelli, I.M., Böhlke, J.K., Masoner, J., Breit, G.N., Lorah, M.M., Tuttle, M.L.W., and Jaeschke, J.B., 2011, Biogeochemical evolution of a landfill leachate plume, Norman, Oklahoma. Ground Water, v. 49, p. 663-687. [Link]

Gu, B., Böhlke, J.K., Sturchio, N.C., Hatzinger, P.B., Jackson, W.A., Beloso, A.D., Heraty, L.J., Bian, Y., Jiang, X., and Brown, G.M., 2011, Applications of selective ion exchange for perchlorate removal, recovery, and environmental forensics, in SenGupta, A. K., ed., Ion Exchange and Solvent Extraction: A Series of Advances: 20. Taylor & Francis, p. 117-144.

Tobias, C.R., and Böhlke, J.K., 2011, Biological and geochemical controls on diel inorganic carbon cycling in a low-order agricultural stream: implications for reach scales and beyond. Chemical Geology, v. 283, p. 18-30. [Link]

Sturchio, N.C., Böhlke, J.K., Gu, B., Hatzinger, P.B., and Jackson, W.A., 2011, Isotopic tracing of perchlorate in the environment. Chapter 22 in Baskaran, M., ed., Handbook of Environmental Isotope Geochemistry Springer-Verlag, p. 437-452.

Holden, N.E., Coplen, T.B., Böhlke, J.K., Wieser, M.E., Singleton, G., Walczyk, T.R., Yoneda, S., Mahaffy, P.G., and Tarbox, L.V., 2011, IUPAC Periodic Table of the Isotopes. Chemistry International, v. 33 (4), p. 20-21 and Supplement. [Link]

Holloway, J.M., Nordstrom, D.K., Böhlke, J.K., McCleskey, R.B., and Ball, J.W., 2011, Ammonium in thermal waters of Yellowstone National Park: Processes affecting speciation and isotope fractionation. Geochimica et Cosmochimica Acta, v. 75, p. 4611-4636. [Link]

McMahon, P.B., Plummer, L.N., Böhlke, J.K., Shapiro, S.D., and Hinkle, S.R., 2011, A comparison of recharge rates in aquifers of the United States based on groundwater age data. Hydrogeology Journal, v. 19, p. 779-800. [Link]

Hatzinger, P.B., Böhlke, J.K., Sturchio, N.C., and Gu, B., 2011, Guidance manual for forensic analysis of perchlorate in groundwater using chlorine and oxygen isotopic analyses. U.S. Department of Defense, Environmental Security Technology Certification Program, ESTCP Project ER-200509, 99 p. [Link]

Rao, B., Hatzinger, P.B., Böhlke, J.K., Sturchio, N.C., Andraski, B., and Jackson, W.A., 2010, Natural chlorate in the environment: Application of a new IC-ESI/MS/MS method with a Cl18O3- internal standard. Environmental Science & Technology, v. 44, p. 8429-8434. [Link]

Jackson, W.A., Böhlke, J.K., Gu, B., Hatzinger, P.B, and Sturchio, N.C., 2010, Isotopic composition and origin of indigenous natural perchlorate and co-occurring nitrate in the southwestern United States. Environmental Science and Technology, v. 44, p. 4869-4876. [Link]

Green, C.T., Böhlke, J.K., Bekins, B., and Phillips, S., 2010, Mixing effects on apparent reaction rates and isotope fractionation during denitrification in a heterogeneous aquifer. Water Resources Research, v. 46, W08525, doi:10.1029/2009WR008903, p. 1-19. [Link]

Smith, R.L., Böhlke, J.K., Repert, D.A., and Hart, C.P., 2009, Nitrification and denitrification in a midwestern stream containing high nitrate: In situ assessment using tracers in dome-shaped incubation chambers. Biogeochemistry, v. 96, p. 189-208. [Link]

Sturchio, N.C., Caffee, M.W., Beloso, A.D., Jr., Heraty, L.J., Böhlke, J.K., Hatzinger, P.B., Jackson, W.A., Gu, B., Heikoop, J.M., Dale, M., 2009. Chlorine-36 as a tracer of perchlorate origin. Environmental Science and Technology, v. 43, p. 6934-6938. [Link]

Böhlke, J.K., Hatzinger, P., Sturchio, N.C., Gu, B., Abbene, I.J., and Mroczkowski, S.J., 2009, Atacama perchlorate as an agricultural contaminant in groundwater: Chemical and isotopic evidence from Long Island, New York, USA. Environmental Science and Technology, v. 43, p. 5619-5625. [Link]

Böhlke, J.K., and Michel, R.L., 2009, Contrasting residence times and fluxes of water and sulfate in two small forested watersheds in Virginia, USA. Science of the Total Environment, v. 407, p. 4363-4377. [Link]

Brand, W.A., Coplen, T.B., Aerts-Bijma, A.T.A., Böhlke, J.K., Gehre, M., Geilman, H., Gröning, M., Jansen, H.G., Meijer, H.A.J., Mroczkowski, S.J., Qi, H., Soergel, K., Stuart-Williams, H., Weise, S.M., and Werner, R.A., 2009, Comprehensive inter-laboratory calibration of reference materials for δ18O versus VSMOW using various on-line high-temperature conversion techniques. Rapid Communications in Mass Spectrometry, v. 23, p. 999–1019. [Link]

Tobias, C.R., Böhlke, J.K., Harvey, J.W., and Busenberg, E., 2009, A simple technique for continuous measurement of time-variable gas transfer in surface waters. Limnology and Oceanography: Methods, v. 7, p. 185-195. [Link]

Lorah, M.M., Cozzarelli, I.M., and Böhlke, J.K., 2009, Biogeochemistry at a wetland sediment-alluvial aquifer interface in a landfill leachate plume. Journal of Contaminant Hydrology, v. 105, p. 99-117. [Link]

Alexander, R.B., Böhlke, J.K., Boyer, E.W., David, M., Harvey, J.W., Mulholland, P.J., Seitzinger, S.P., Tobias, C.R., Tonitto, C., and Wollheim, W.M., 2009, Simulating temporal variations of nitrogen losses in river networks with a dynamic transport model unravels the coupled effects of hydrological and biogeochemical processes. Biogeochemistry, v. 93, p. 91-116. [Link]

Böhlke, J.K., Antweiler, R.C., Harvey, J.W., Laursen, A.E., Smith, L.K., Smith, R.L., and Voytek, M.A., 2009, Multi-scale measurements and modeling of denitrification in streams with varying flow and nitrate concentration in the upper Mississippi River basin, USA. Biogeochemistry, v. 93, p. 117-141. [Link]

Hatzinger, P., Böhlke, J.K., Sturchio, N.C., Gu, B., Heraty, L.J., and Borden, R.C., 2009, Fractionation of stable isotopes in perchlorate and nitrate during in situ biodegradation in a sandy aquifer. Environmental Chemistry, v. 6, p. 44-52. [Link]

Bratton, J.F., Böhlke, J.K., Krantz, D.E., and Tobias, C.R., 2009, Flow and geochemistry of groundwater beneath a back-barrier lagoon: The subterranean estuary at Chincoteague Bay, Maryland. Marine Chemistry, v. 113, p. 78-92. [Link]

Miller, M.F., Gibson, J.M., Böhlke, J.K., 2009. Thermochemical generation of anomalous (mass-independent) oxygen isotope distributions – is carbonate pyrolysis the only example? Proceedings of the 4th International Symposium on Isotopomers (ISI2008), Tokyo, October 2008, Paper #ISI2008-4, p. 6-9 (on compact disk).

Hannon, J.E., Böhlke, J.K., and Mroczkowski, S.J., 2008, Effects of nitrate and water on the oxygen isotopic analysis of barium sulfate precipitated from solution. Rapid Communications in Mass Spectrometry, v. 22, p. 4109-4120. [Link]

Hannon, J.E., and Böhlke, J.K., 2008, Determination of the δ(15N/14N) of ammonium (NH4+) in water: RSIL Lab Code 2898. in Revesz, K., and Coplen, T. B., eds., Methods of the Reston Stable Isotope Laboratory, U.S. Geological Survey, Techniques and Methods, book 10, sec. C, chap. 15: Reston, VA, p. 1-30. [Link]

Hinkle, S.R., Böhlke, J.K., and Fisher, L.H., 2008, Mass balance and isotope effects during nitrogen transport through septic tank systems with packed-bed (sand) filters. Science of the Total Environment, v. 407, p. 324-332. [Link]

McMahon, P.B., Burow, K.R., Kauffman, L.J., Eberts, S.M., Böhlke, J.K., and Gurdak, J.J., 2008, Simulated response of water quality in public-supply wells to land-use change. Water Resources Research, v. 44, W00A06, doi:10.1029/2007WR006731, p. 1-16. [Link]

Campbell, D.H., Nanus, L., Böhlke, J.K., Harlin, K., and Collett, J., 2008, Nitrogen saturation in the Rocky Mountains: Linking emissions, deposition, and ecosystem effects using stable isotopes of nitrogen compounds. Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA 3, p. 2138-2144.

Gates, J.B., Edmunds, W.M., and Böhlke, J.K., 2008, Ecohydrological factors affecting nitrate concentrations in a phreatic desert aquifer in Northwest China. Environmental Science and Technology, v. 42, p. 3531 - 3537. [Link]

Green, C.T., Puckett, L.J., Böhlke, J.K., Bekins, B.A., Phillips, S.P., Kauffman, L.J., Denver, J.M., and Johnson, H.M., 2008, Limited occurrence of denitrification in four shallow aquifers in agricultural areas of the United States. Journal of Environmental Quality, v. 37, p. 994-1009. [Link]

McMahon, P.B., Böhlke, J.K., Kauffman, L.J., Kipp, K.L., Landon, M.K., Crandall, C.A., Burow, K.R., and Brown, C.J., 2008, Source and transport controls on the movement of nitrate to public supply wells in selected principal aquifers of the United States. Water Resources Research, v. 44, W04401, doi:10.1029/2007WR006252, p. 1-17. [Link]

Walker, R.J., Böhlke, J.K., McDonough, W.F., and Li, J., 2007, Effects of Mother Lode-type gold mineralization on 187Os/188Os and platinum-group element concentrations in peridotite: Alleghany district, California. Economic Geology, v. 102, p. 1019-1089. [Link]

McMahon, P.B., and Böhlke, J.K., 2007, Transport- Linking the chemistry of recharge and the used resource in the High Plains Aquifer. in McMahon, P. B., Dennehy, K. F., Bruce, B. W., Gurdak, J. J., and Qi, S. L., eds., Water-Quality Assessment of the High Plains Aquifer, 1999-2004: U.S. Geological Survey Professional Paper 1749, p. 49-72. [Link]

Böhlke, J.K., Smith, R.L., and Hannon, J.E., 2007, Isotopic analysis of N and O in nitrite and nitrate by sequential selective bacterial reduction to N2O. Analytical Chemistry, v. 79, p. 5888-5895. [Link]

Tobias, C.R., Böhlke, J.K., and Harvey, J.W., 2007, The oxygen-18 isotope approach for measuring aquatic metabolism in high-productivity waters. Limnology and Oceanography, v. 52, p. 1439-1453. [Link]

Sturchio, N.C., Böhlke, J.K., Beloso, A.D.Jr., Streger, S.H., Heraty, L.J., and Hatzinger, P.B., 2007, Oxygen and chlorine isotopic fractionation during perchlorate biodegradation: laboratory results and implications for forensics and natural attenuation studies. Environmental Science and Technology, v. 41, p. 2796-2802. [Link]

Böhlke, J.K, O'Connell, M.E., and Prestegaard, K.L., 2007, Ground-water stratification and delivery of nitrate to an incised stream in varying flow conditions. Journal of Environmental Quality, v. 36, p. 664-680. [Link]

Casciotti, K.L., Böhlke, J.K., McIlvin, M.R., Mroczkowski, S.J., and Hannon, J.E., 2007, Oxygen isotopes in nitrite: analysis, calibration, and equilibration. Analytical Chemistry, v. 79, p. 2427-2436. [Link]

McMahon, P.B., Böhlke, J.K., and Carney, C.P., 2007, Vertical gradients in water chemistry and age in the northern High Plains aquifer, Nebraska, 2003. U.S. Geological Survey Scientific Investigations Report 2006-5294, 58 p. [Link]

Hinkle, S.R., Böhlke, J.K., Duff, J.H., Morgan, D.S., and Weick, R.J., 2007, Aquifer-scale controls on the distribution of nitrate and ammonium in ground water near La Pine, Oregon, USA. Journal of Hydrology, v. 333, p. 486-503. [Link]

Böhlke, J.K., Verstraeten, I.M., and Kraemer, T.F., 2007, Effects of surface-water irrigation on the sources, fluxes, and residence times of water, nitrate, and uranium in an alluvial aquifer. Applied Geochemistry, v. 22, p. 152-174. [Link]

Smith, L.K., Voytek, M.A., Böhlke, J.K., and Harvey, J.W., 2006, Denitrification in nitrate-rich streams: application of N2:Ar and 15N-tracer methods in intact cores. Ecological Applications, v. 16, p. 2191-2207. [Link]

Seitzinger, S.P., Harrison, J., Böhlke, J.K., Bouwman, A.F., Lowrance, R.R., Peterson, B.J., Tobias, C.R., and van Drecht, G., 2006, Denitrification across landscapes and waterscapes: a synthesis. Ecological Applications, v. 16, p. 2064-2090. [Link]

Groffman, P.M., Altabet, M.A., Böhlke, J.K., Butterbach-Bahl, K., David, M.B., Giblin, A.E., Kana, T.M., Nielsen, L.P., Firestone, M.K., and Voytek, M.A., 2006, Methods for measuring denitrification: diverse approaches to a difficult problem. Ecological Applications, v. 16, p. 2091-2122. [Link]

Böhlke, J.K., 2006, Tracermodel1- Excel workbook for calculation and presentation of environmental tracer data for simple groundwater mixtures, Use of Chlorofluorocarbons in Hydrology- a Guidebook: International Atomic Energy Agency, STI/PUB/1238, Section III.10.3, Vienna, p. 239-243.

Böhlke, J.K., Smith, R.L., and Miller, D.N., 2006, Ammonium transport and reaction in contaminated ground water: application of isotopic tracers and isotope fractionation studies. Water Resources Research, v. 42, W05411, doi:10.1029/2005WR004349, p. 1-19. [Link]

McMahon, P.B., and Böhlke, J.K., 2006, Regional patterns in the isotopic composition of natural and anthropogenic nitrate in groundwater, High Plains, USA. Environmental Science and Technology, v. 40, p. 2965-2970. [Link]

McMahon, P.B., Dennehy, K.F., Bruce, B.W., Böhlke, J.K, Michel, R.L., Gurdak, J.J., and Hurlbut, D.B., 2006, Storage and transit time of chemicals in thick unsaturated zones under rangeland and irrigated cropland, High Plains, United States. Water Resources Research, v. 42, W03413, doi:10.1029/2005WR004417, p. 1-18. [Link]

Sturchio, N.C., Böhlke, J.K., Gu, B., Horita, J., Brown, G.M., Beloso, A, Jr., Patterson, L.J., Hatzinger, P.B., Jackson, W.A., and Batista, J.R., 2006, Stable isotopic composition of chlorine and oxygen in synthetic and natural perchlorate, Chapter 5. in Gu, B., and Coates, J. D., eds., Perchlorate: Environmental Occurrence, Interactions and Treatment: Springer, New York, p. 93-109.

Plummer, L.N., Böhlke, J.K., and Doughten, M.W., 2006, Perchlorate in Pleistocene and Holocene groundwater in north-central New Mexico. Environmental Science and Technology, v. 40, p. 1757-1763. [Link]

Smith, R.L., Baumgartner, L.K., Miller, D.N., Repert, D.A., and Böhlke, J.K, 2006, Assessment of nitrification potential in ground water using short term, single-well injection experiments. Microbial Ecology, v. 51, p. 22-35. [Link]

Böhlke, J.K, Sturchio, N.C., Gu, B., Horita, J., Brown, G.M., Jackson, W.A., Batista, J.R., and Hatzinger, P.B., 2005, Perchlorate isotope forensics. Analytical Chemistry, v. 77, p. 7838 -7842. [Link]

McMahon, P., Böhlke, J.K., Brown, C., Burow, K., Crandall, C., and Landon, M., 2005, Use of isotopes, age-dating, and numerical simulation to evaluate source histories and transport of NO3- to public supply wells in principal aquifers of the United States, AIG-6, Proceedings of the 6th International Symposium on Applied Isotope Geochemistry: Prague, p. 157-158 (CD-ROM).

Antweiler, R.C., Smith, R.L., Voytek, M.A., Böhlke, J.K., and Dupre, D.H., 2005, Water-quality data from two agricultural drainage basins in northwestern Indiana and northeastern Illinois: III. Biweekly data, 2000-2002. U.S. Geological Survey Open-File Report 2005-1197, Boulder, 66 p. [Link]

Antweiler, R.C., Smith, R.L., Voytek, M.A., and Böhlke, J.K., 2005, Water-quality data from two agricultural drainage basins in northwestern Indiana and northeastern Illinois: II. Diel data, 1999-2001. U.S. Geological Survey Open-File Report 2005-1053, Boulder, 114 p. [Link]

Antweiler, R.C., Smith, R.L., Voytek, M.A., Böhlke, J.K., and Richards, K.D., 2005, Water-quality data from two agricultural drainage basins in northwestern Indiana and northeastern Illinois: I. Lagrangian and synoptic data, 1999-2002. U.S. Geological Survey Open-File Report 2004-1317, Boulder, 206 p. [Link]

Böhlke, J.K., de Laeter, J.R., De Bièvre, P., Hidaka, H., Peiser, H.S., Rosman, K.J.R., and Taylor, P.D.P., 2005, Isotopic compositions of the elements, 2001. Journal of Physical and Chemical Reference Data, v. 34, p. 57-67. [Link]

Bratton, J.F., Böhlke, J.K, Manheim, F.T., and Krantz, D.E., 2004, Ground water beneath coastal bays of the Delmarva Peninsula: ages and nutrients. Ground Water, v. 42, p. 1021-1034. [Link]

Michalski, G., Böhlke, J.K, and Thiemens, M.H., 2004, Long term atmospheric deposition as the source of nitrate and other salts in the Atacama Desert, Chile: New evidence from mass-independent oxygen isotopic compositions. Geochimica et Cosmochimica Acta, v. 68, p. 4023-4038. [Link]

McMahon, P.B., Böhlke, J.K, and Lehman, T.M., 2004, Vertical gradients in water chemistry and age in the southern High Plains Aquifer, Texas, 2002. U.S. Geological Survey Scientific Investigations Report 2004-5053, 53 p. [Link]

McMahon, P.B., Böhlke, J.K, and Christenson, S.C., 2004, Geochemistry, radiocarbon ages, and paleorecharge conditions along a transect in the central High Plains aquifer, southwestern Kansas, USA. Applied Geochemistry, v. 19, p. 1655-1686. [Link]

Smith, R.L., Böhlke, J.K, Garabedian, S.P., Revesz, K.M., and Yoshinari, T., 2004, Assessing denitrification in groundwater using natural gradient tracer tests with 15N: In situ measurement of a sequential multistep reaction. Water Resources Research, v. 40, W07101, doi: 10.1029/2003WR002919, p. 1-17. [Link]

Oren, O., Yechieli, Y., Böhlke, J.K., and Dody, A., 2004, Contamination of groundwater under cultivated fields in an arid environment, central Arava Valley, Israel. Journal of Hydrology, v. 290, p. 312-328. [Link]

Böhlke, J.K, Harvey, J.W., and Voytek, M.A., 2004, Reach-scale isotope tracer experiment to quantify denitrification and related processes in a nitrate-rich stream, midcontinent United States. Limnology and Oceanography, v. 49, p. 821-838. [Link]

Coplen, T.B., Böhlke, J.K, and Casciotti, K.L., 2004, Using dual bacterial denitrification to improve 15N determinations of nitrates containing mass independent 17O. Rapid Communications in Mass Spectrometry, v. 18, p. 245-250. [Link]

Qi, H., Coplen, T. B., Geilman, H., Brand, W.A., and Böhlke, J.K, 2003, Two new organic reference materials for 13C and 15N measurements and a new value for the 13C of NBS 22 oil. Rapid Communications in Mass Spectrometry, v. 17, p. 2483-2487. [Link]

Griggs, E.M., Kump, L.R., and Böhlke, J.K., 2003, The fate of wastewater-derived nitrate in the subsurface of the Florida Keys: Key Colony Beach, Florida. Estuarine, Coastal and Shelf Science, v. 58, p. 517-539. [Link]

Böhlke, J.K., and Krantz, D.E., 2003, Isotope geochemistry and chronology of offshore ground water beneath Indian River Bay, Delaware. U.S. Geological Survey Water-Resources Investigations Report 03-4192, 37 p. [Link]

Lindsey, B.D., Phillips, S.W., Donnelly, C.A., Speiran, G.K., Plummer, L.N., Böhlke, J.K, Focazio, M.J., Burton, W.C., and Busenberg, E., 2003, Residence times and nitrate transport in ground water discharging to streams in the Chesapeake Bay Watershed. U.S. Geological Survey Water-Resources Investigations Report 03-4035, New Cumberland, PA, 201 p. [Link]

Plummer, L.N., Böhlke, J.K., and Busenberg, E., 2003, Approaches for ground-water dating. in Lindsey, B. D., and others, eds., Residence times and nitrate transport in ground water discharging to streams of the Chesapeake Bay Watershed: U.S. Geological Survey Water-Resources Investigations Report 03-4035, p. 12-24. [Link]

Böhlke, J.K., 2003, Sources, transport, and reaction of nitrate in ground water. in Lindsey, B. D., and others, eds., Residence times and nitrate transport in ground water discharging to streams in the Chesapeake Bay Watershed: U.S. Geological Survey Water Resources Investigations Report 03-4035, p. 25-39. [Link]

de Laeter, J.R., Böhlke, J.K., De Bievre, P., Hidaka, H., Peiser, H.S., Rosman, K.J.R., and Taylor, P.D.P., 2003, Atomic weights of the elements: Review 2000. Pure and Applied Chemistry, v. 75, p. 683-800. [Link]

Böhlke, J.K., Mroczkowski, S.J., and Coplen, T.B., 2003, Oxygen isotopes in nitrate: new reference materials for 18O:17O:16O measurements and observations on nitrate-water equilibration. Rapid Communications in Mass Spectrometry, v. 17, p. 1835-1846. [Link]

Barlow, R.A., Brakebill, J.W., Bratton, J.F., Blazer, V.S., Böhlke, J.K, Bricker, O.P., Colman, S.M., Cronin, T.M., Hupp, C.R., Keough, J.R., Landwehr, J.M., Langland, M.J., Newell, W.L., Perry, M.C., Phillips, S.W., Preston, S.D., Rybicki, N.B., Simon, N.S., and Willard, D.A., 2002, The U.S. Geological Survey and the Chesapeake Bay- The role of Science in environmental restoration. U.S. Geological Survey Circular 1220, 32 p. [Link]

Coplen, T.B., Böhlke, J.K., De Bièvre, P., Ding, T., Holden, N.E., Hopple, J.A., Krouse, H.R., Lamberty, A., Peiser, H.S., Révész, K., Rieder, S.E., Rosman, K.J.R., Roth, E., Taylor, P.D.P., Vocke, R.D.Jr., and Xiao, Y.K., 2002, Isotope-abundance variations of selected elements. Pure and Applied Chemistry, v. 74, p. 1987-2017. [Link]

Revesz, K., and Böhlke, J.K., 2002, Comparison of 18O measurements in nitrate by different combustion techniques. Analytical Chemistry, v. 74, p. 5410-5413. [Link]

Michalski, G., Savarino, J., Böhlke, J.K, and Thiemens, M.H., 2002, Determination of the total oxygen isotopic composition of nitrate and the calibration of a 17O nitrate reference material. Analytical Chemistry, v. 74, p. 4989-4993. [Link]

Coplen, T.B., Hopple, J.A., Böhlke, J.K., Peiser, H.S., Rieder, S.E., Krouse, H.R., Rosman, K.J.R., Ding, T., Vocke, R.D.Jr., Révész, K.M., Lamberty, A., Taylor, P.D.P., and De Bièvre, P., 2002, Compilation of minimum and maximum isotope ratios of selected elements in naturally occurring terrestrial materials and reagents. U.S. Geological Survey Water-Resources Investigations Report 01-4222, 98 p. [Link]

Densmore, J.N., and Böhlke, J.K., 2002, Nitrate contamination and incorporation of excess air associated with artificial recharge in a desert basin, Yucca Valley, California, U.S. Geological Survey Artificial Recharge Workshop Proceedings, Sacramento, California, April 2-4, 2002: U.S. Geological Survey Open-File Report 02-89, p. 69-70. [Link]

Katz, B.G., Böhlke, J. K., and Hornsby, D., 2002, Using spring-water chemistry to assess groundwater contamination and ages of shallow and deep ground water flow systems. Karst Frontiers, Karst Waters Institute Special Publication 7, p. 76-78.

Cook, P.G., Böhlke, J.K, and Solomon, D.K., 2002, Measuring groundwater recharge and discharge using environmental tracers, In: Balancing the Groundwater Budget, Proceedings of the International Association of Hydrogeologists Groundwater Conference, Darwin 12-17 May 2002: International Association of Hydrogeologists, p. 1-13 (compact disc).

Casciotti, K.L., Sigman, D.M., Hastings, M., Böhlke, J.K., and Hilkert, A., 2002, Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method. Analytical Chemistry, v. 74, p. 4905-4912. [Link]

Böhlke, J.K., 2002, Groundwater recharge and agricultural contamination- Erratum. Hydrogeology Journal, v. 10, p. 438-439. [Link]

Böhlke, J.K., 2002, Groundwater recharge and agricultural contamination. Hydrogeology Journal, v. 10, p. 153-179. [Link]

Böhlke, J.K., Wanty, R., Tuttle, M., Delin, G., and Landon, M., 2002, Denitrification in the recharge area and discharge area of a transient agricultural nitrate plume in a glacial outwash sand aquifer, Minnesota. Water Resources Research, v. 38(10), doi:10.1029/2001WR000663, p. 1-26. [Link]

Bachman, L.J., Krantz, D.E., and Böhlke, J.K, 2002, Hydrogeologic framework, ground-water geochemistry, and assessment of nitrogen yield from base flow in two agricultural watersheds, Kent County, Maryland. U.S. Environmental Protection Agency, EPA/600/R-02/008, 93 p. [Link]

Verstraeten, I.M., Böhlke, J.K., Kraemer, T.F., and Cannia, J.C., 2002, Use of environmental tracers and isotopes to evaluate sources of water, nitrogen, and uranium in an irrigated alluvial valley, Nebraska. U.S. Geological Survey Fact Sheet FS-100-01, 4 p. [Link]

Verstraeten, I.M., Steele, G.V., Cannia, J.C., Hitch, D.E., Scripter, K.G., Böhlke, J.K., Kraemer, T.F., and Stanton, J.S., 2001, Interaction of surface water and ground water in the Dutch Flats area, western Nebraska, 1995-99. U.S. Geological Survey Water-Resources Investigations Report 01-4070, 56 p. [Link]

Verstraeten, I.M., Steele, G.V., Böhlke, J.K., Kraemer, T.F., Wilson, K.E., and Carnes, A.E., 2001, Selected field and analytical methods and analytical results in the Dutch Flats area, western Nebraska, 1995-99. U.S. Geological Survey Open-File Report 00-413, 53 p. [Link]

Sigman, D.M., Casciotti, K.L., Andreani, M., Barford, C., Galanter, M., and Böhlke, J.K., 2001, A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater. Analytical Chemistry, v. 73, p. 4145-4153. [Link]

Plummer, L.N., Busenberg, E., Böhlke, J.K., Nelms, D.L., Michel, R.L., and Schlosser, P., 2001, Groundwater residence times in Shenandoah National Park, Blue Ridge Mountains, Virginia, USA: a multi-tracer approach. Chemical Geology, v. 179, p. 93-111. [Link]

Katz, B.G., Böhlke, J.K., and Hornsby, H.D., 2001, Timescales for nitrate contamination of spring waters, northern Florida, USA. Chemical Geology, v. 179, p. 167-186. [Link]

Delin, G.N., Healy, R.W., Landon, M.K., and Böhlke, J.K., 2001, Effects of topography and soil properties on recharge at two sites in an agricultural field. Journal of the American Water Resources Association, v. 36, p. 1401-1416. [Link]

Verstraeten, I.M., Böhlke, J.K., and Kraemer, T.F., 2000, Groundwater/surface-water interactions and sources of nitrogen and uranium in an irrigated area of Nebraska, USA. Tracers and Modeling in Hydrogeology, International Association of Hydrological Scientists Publication 262, p. 525-531. [Link]

Plummer, L.N., Busenberg, E., Böhlke, J.K., Carmody, R.W., Casile, G.C., Coplen, T.B., Doughten, M.W., Kirkland, W., Michel, R.L., Nelms, D.L., Norton, B.C., Plummer, K.E., Qi, H., Revesz, K., Schlosser, P., Spitzer, S., Wayland, J.E., and Widman, P.K., 2000, Chemical and isotopic composition of water from springs, wells, and streams in parts of Shenandoah National Park, Virginia, and vicinity, 1995-1999. U.S. Geological Survey Open-File Report 00-373, 70 p. [Link]

Katz, B. G., and Böhlke, J.K, 2000, Monthly variability and possible sources of nitrate in ground water beneath mixed agricultural land use, Suwannee and Lafayette Counties, Florida. U.S. Geological Survey Water Resources Investigations Report 00-4219, 28 p. [Link]

Densmore, J.N., and Böhlke, J.K., 2000, Use of nitrogen isotopes to determine sources of nitrate contamination in two desert basins in California. in Reichard, E. G., Hauchman, F. S., and Sancha, A. M., eds., Interdisciplinary Perspectives on Drinking Water Risk Assessment and Management: International Association of Hydrological Sciences Publication 260, p. 63-73. [Link]

Cook, P.G., and Böhlke, J.K., 2000, Determining timescales for groundwater flow and solute transport. in Cook, P. G., and Herczeg, A. L., eds., Environmental Tracers in Subsurface Hydrology: Kluwer Academic Publishers, Boston, p. 1-30.

Böhlke, J.K., and Horan, M., 2000, Strontium isotope geochemistry of ground waters and streams affected by agriculture, Locust Grove, Maryland. Applied Geochemistry, v. 15, p. 599-609. [Link]

Böhlke, J.K., 1999, California gold. in Moores, E. M., Sloan, D., and Stout, D. L., eds., Classic Cordilleran Concepts: A View from California: Geological Society of America Special Paper 338, p. 42-67. [Link]

Katz, B.G., Hornsby, H.D., and Böhlke, J.K, 1999, Sources of nitrate in water from springs and the Upper Floridan aquifer, Suwannee River basin, Florida. in Heathwaite, L., ed., Impacts of Land-Use Change on Nutrient Loads from Diffuse Sources: International Association of Hydrologic Sciences, Publication 257, p. 117-124.

Katz, B.G., Hornsby, H.D., Böhlke, J.K., and Mokray, M.F., 1999, Sources and chronology of nitrate contamination in spring waters, Suwanee River basin, Florida. U.S. Geological Survey Water Resources Investigations Report 99-4252, 54 p. [Link]

Böhlke, J.K., Smith, R.L., Coplen, T.B., Busenberg, E., and LeBlanc, D.R., 1999, Recharge conditions and flow velocities of contaminated and uncontaminated ground waters at Cape Cod, Massachusetts: Evaluation of 2H, 18O, and dissolved gases, U.S. Geological Survey Water-Resources Investigations Report 99-4018C, p. 337-348. [Link]

Smith, R.L., Böhlke, J.K., Revesz, K., Yoshinari, T., Hatzinger, P., and Penarrieta, C.T., 1999, In situ assessment of the transport and microbial consumption of oxygen in ground water, Cape Cod, Massachusetts. U.S. Geological Survey Water-Resources Investigations Report 99-4018C, p. 317-322. [Link]

Revesz, K., Böhlke, J.K., Smith, R.L., and Yoshinari, T., 1999, Stable isotope composition of dissolved O2 undergoing respiration in a ground-water contamination gradient, U.S. Geological Survey Water-Resources Investigations Report 99-4018C, p. 323-328. [Link]

Miller, D.N., Smith, R.L., and Böhlke, J.K., 1999, Nitrification in a shallow, nitrogen-contaminated aquifer, Cape Cod, Massachusetts, U.S. Geological Survey Water-Resources Investigations Report 99-4018C, p. 329-336. [Link]

McMahon, P.B., Böhlke, J.K., and Bruce, B.W., 1999, Denitrification in marine shales in northeastern Colorado, USA. Water Resources Research, v. 35, p. 1629-1642. [Link]

Revesz, K., Böhlke, J.K., and Yoshinari, T., 1998, 18O and 15N determination in nitrate, Isotope Techniques in the Study of Environmental Change: International Atomic Energy Agency, Vienna, p. 851-854.

Focazio, M.J., Plummer, L.N., Böhlke, J.K., Busenberg, E., Bachman, L.J., and Powars, D.S., 1998, Preliminary estimates of residence times and apparent ages of ground water in the Chesapeake Bay watershed, and water-quality data from a survey of springs. U.S. Geological Survey Water Resources Investigations Report 97-4225, 75 p. [Link]

Stute, M., Deak, J., Revesz, K., Böhlke, J.K., Deseo, E., Weppernig, R., and Schlosser, P., 1997, Tritium/3He dating of river infiltration: An example from the Danube in the Szigetköz area, Hungary. Ground Water, v. 35, p. 905-911. [Link]

Schroeder, R.A., Anders, R., Böhlke, J.K., Michel, R.L., and Metge, D.W., 1997, Water quality at production wells near artificial-recharge basins in Montebello Forebay, Los Angeles County. in Kendall, D. R., ed., Conjunctive Use of Water Resources: Aquifer Storage and Recovery, Proceedings of the AWRA Symposium: TPS-97-2. American Water Resources Association, Herndon, Virginia, p. 273-284.

Revesz, K., Böhlke, J.K., and Yoshinari, T., 1997, Determination of 18O and 15N in nitrate. Analytical Chemistry, v. 69, p. 4375-4380. [Link]

Delin, G.N., Landon, M.K., Nelson, K.J., Wanty, R.B., Healy, R.W., Olsen, H.W., Böhlke, J.K., Schroyer, B.R., and Capel, P.D., 1997, Hydrogeologic and water-quality data used to evaluate the effects of focused recharge on ground-water quality near Princeton, Minnesota, 1991-1995. U.S. Geological Survey Open-File Report 97-21, 47 p. [Link]

Böhlke, J.K., Revesz, K., Busenberg, E., Deak, J., Deseo, E., and Stute, M., 1997, A ground-water record of halocarbon transport by the Danube River. Environmental Science and Technology, v. 31, p. 3293-3299. [Link]

Böhlke, J.K., Ericksen, G.E., and Revesz, K., 1997, Stable isotope evidence for an atmospheric origin of desert nitrate deposits in northern Chile and southern California. Chemical Geology, v. 136, p. 135-152. [Link]

Wanty, R.B., Tuttle, M.L., Landon, M.K., Delin, G.N., and Böhlke, J.K., 1996, Geochemistry of nitrogen in a farmed watershed near Princeton, Minnesota. U.S. Geological Survey Water Resources Investigations Report 94-4015, p. 591-596. [Link]

Schroeder, R.A., Martin, P., and Böhlke, J.K., 1996, Chemical, isotopic, and microbiological evidence for denitrification during transport of domestic wastewater through a thick unsaturated zone in the Mojave Desert, 2. U.S. Geological Survey Water Resources Investigations Report 94-4015, p. 917-926. [Link]

Reilly, T.E., LeBlanc, D.R., Bussey, K.W. , Councell, T.B., Smith, R.L., and Böhlke, J.K., 1996, Chemical and stable-isotope data from an experiment to examine temporal variability in water samples from screened wells on Cape Cod, Massachusetts, 1994. U.S. Geological Survey Open-File Report 95-734, 21 p. [Link]

McMahon, P.B., and Böhlke, J.K., 1996, Denitrification and mixing in a stream-aquifer system: Effects on nitrate loading to surface water. Journal of Hydrology, v. 186, p. 105-128. [Link]

Deseo, E., Deak, J., Revesz, K., Böhlke, J.K., and Stute, M., 1996, Groundwater origin and dating studies in Szigetköz. Acta Geologica Hungarica, v. 39 (Suppl.), p. 31-34.

Deak, J., Deseo, E., Böhlke, J.K., and Revesz, K., 1996, Isotope hydrology studies in the Szigetköz region, northwest Hungary, Isotopes in Water Resources Management: 1. International Atomic Energy Agency, Vienna, p. 419-432.

Shanks, W.C., Böhlke, J.K., and Seal, R.R., 1995, Stable isotopes in mid-ocean ridge hydrothermal systems: Interactions between fluids, minerals, and organisms. in Humphris, S., Zierenberg, R. A., and Mullineaux, L. S., eds., Seafloor Hydrothermal Systems: Physical, Chemical, Biological, and Geological Interactions: American Geophysical Union Monograph 91, p. 194-221.

McMahon, P.B., Böhlke, J.K., and Litke, D.W., 1995, Fate of nitrate in the South Platte River alluvial aquifer system, Colorado. U.S. Geological Survey Yearbook, Fiscal Year 1994, p. 45-47.

Böhlke, J.K., and Denver, J.M., 1995, Combined use of groundwater dating, chemical, and isotopic analyses to resolve the history and fate of nitrate contamination in two agricultural watersheds, Atlantic coastal plain, Maryland. Water Resources Research, v. 31, p. 2319-2339. [Link]

Böhlke, J.K., and Coplen, T.B., 1995, Interlaboratory comparison of reference materials for nitrogen-isotope-ratio measurements, Reference and intercomparison materials for stable isotopes of light elements, IAEA TECDOC 825: International Atomic Energy Agency, Vienna, p. 51-66. [Link]

Wanty, R.B., Tuttle, M.L., Böhlke, J.K., and Briggs, P.H., 1994, Chemical analyses of ground and surface water from Battle Brook drainage basin, near Princeton, Minnesota. U.S. Geological Survey Open-File Report 94-129, 26 p. [Link]

Böhlke, J.K., and Shanks, W.C., 1994, Stable isotope study of hydrothermal vents at Escanaba Trough: Observed and calculated effects of sediment-seawater interaction. in Morton, J. L., Zierenberg, R. A., and Reiss, C. A., eds., Geologic, Hydrothermal, and Biologic Studies at Escanaba Trough, Gorda Ridge, Offshore Northern California: U.S. Geological Survey Bulletin 2022, p. 223-239. [Link]

Sturchio, N.C., Böhlke, J.K., and Markun, F.J., 1993, Radium isotope geochemistry of thermal waters, Yellowstone National Park, Wyoming. Geochimica et Cosmochimica Acta, v. 57, p. 1203-1214. [Link]

Schroeder, R.A., Martin, P., and Böhlke, J.K, 1993, Chemical, isotopic, and microbiological evidence for denitrification during transport of domestic wastewater through a thick unsaturated zone in the Mojave Desert, San Bernardino County, California. U.S. Geological Survey Open-File Report 93-414, 10 p. [Link]

Böhlke, J.K., Gwinn, C.J. , and Coplen, T.B., 1993, New reference materials for nitrogen-isotope-ratio measurements. Geostandards Newsletter, v. 17, p. 159-164. [Link]

Coplen, T.B., Krouse, H.R., and Böhlke, J.K., 1992, Reporting of nitrogen-isotope abundances. Pure and Applied Chemistry, v. 64, p. 907-908. [Link]

Böhlke, J.K., and Irwin, J.J., 1992, Brine history indicated by argon, krypton, chlorine, bromine, and iodine analyses of fluid inclusions from the Mississippi Valley type lead-fluorite-barite deposits at Hansonburg, New Mexico. Earth and Planetary Science Letters, v. 110, p. 51-66. [Link]

Böhlke, J.K., and Irwin, J.J., 1992, Laser microprobe analyses of Cl, Br, I, and K in fluid inclusions: Implications for sources of salinity in some ancient hydrothermal fluids. Geochimica et Cosmochimica Acta, v. 56, p. 203-225. [Link]

Böhlke, J.K., and Irwin, J.J., 1992, Laser microprobe analyses of noble gas isotopes and halogens in fluid inclusions: Analyses of micro-standards and synthetic inclusions in quartz. Geochimica et Cosmochimica Acta, v. 56, p. 187-201. [Link]

Irwin, J.J., and Böhlke, J.K., 1991, Microanalysis of trace elements and noble gas isotopes in minerals and fluid inclusions. Proceedings of the 26th Microbeam Analysis Conference, p. 35-40.

Abrajano, T.A., Jr., Sturchio, N.C., Kennedy, B.M., Lyon, G.L., Muehlenbachs, K., and Böhlke, J.K., 1990, Geochemistry of reduced gas related to serpentinization of the Zambales ophiolite, Philippines. Applied Geochemistry, v. 5, p. 625-630. [Link]

Sturchio, N.C., Böhlke, J.K., and Binz, C.M., 1989, Radium-thorium disequilibrium and zeolite-water ion exchange in a Yellowstone hydrothermal environment. Geochimica et Cosmochimica Acta, v. 53, p. 1025-1034. [Link]

Böhlke, J.K., Kirschbaum, C., and Irwin, J.J., 1989, Simultaneous analyses of noble gas isotopes and halogens in fluid inclusions in neutron-irradiated quartz veins using a laser microprobe noble gas mass spectrometer. in Shanks, W. C., III, and Criss, R. E., eds., New Frontiers in Stable Isotope Research: Laser Probes, Ion Probes, and Small Sample Analysis, U.S. Geological Survey Bulletin 1890: p. 61-88. [Link]

Böhlke, J.K., 1989, Comparison of metasomatic reactions between a common CO2-rich vein fluid and diverse wall rocks: Intensive variables, mass transfers, and gold mineralization at Alleghany, California. Economic Geology, v. 84, p. 291-327. [Link]

Böhlke, J.K., Coveney, R.M., Jr., Rye, R.O., and Barnes, I., 1988, Stable isotope investigation of gold quartz veins at the Oriental mine, Alleghany district, California. U.S. Geological Survey Open-File Report 88-279, 24 p. [Link]

Böhlke, J.K., 1988, Carbonate-sulfide equilibria and "stratabound" disseminated epigenetic gold mineralization: A proposal based on examples from Alleghany, California. Applied Geochemistry, v. 3, p. 499-516. [Link]

Abrajano, T.A., Sturchio, N.C., Böhlke, J.K., Poreda, R.J., Lyon, G.L., and Stevens, C.M., 1988, Methane-hydrogen gas seeps, Zambales, Philippines: Deep or shallow origin. Chemical Geology, v. 71, p. 211-222. [Link]

Abrajano, T.A., Bates, J.K., and Böhlke, J.K., 1988, Linear free energy relationships in glass corrosion. Materials Issues in Art and Archeaology, Materials Research Society Proceedings, v. 125, p. 383-392.

Böhlke, J.K., and Kistler, R.W., 1986, Rb-Sr, K-Ar, and stable isotope evidence for the ages and sources of fluid components in gold-quartz veins of the northern Sierra Nevada foothills metamorphic belt, California. Economic Geology, v. 81, p. 296-322. [Link]

Böhlke, J.K., and McKee, E.H., 1984, K-Ar ages relating to metamorphism, plutonism, and gold quartz vein mineralization near Alleghany, Sierra County, California. Isochron/West, v. 39, p. 3-7.

Böhlke, J.K., Alt, J.C., and Muehlenbachs, K., 1984, Oxygen isotope-water relations in altered deep-sea basalts: Low temperature mineralogic controls. Canadian Journal of Earth Sciences, v. 21, p. 67-77. [Link]

Böhlke, J.K., 1982, Orogenic (metamorphic-hosted) gold-quartz viens. in Erickson, R. L., ed., Characteristics of Mineral Deposit Occurrences: U.S. Geological Survey Open-File Report 82-795, p. 70-76. [Link]

Böhlke, J.K., Radtke, A.S., Heropoulos, C., and Lamothe, P.J., 1981, Spectroscopic geochemical study of vanadiferous marine sediments of the Gibellini claims, sourthern Fish Creek Range, Eureka County, Nevada. U.S. Geological Survey Open-File Report 81-32, 37 p. [Link]

Böhlke, J.K., Honnorez, J., Honnorez-Guerstein, B.M., Muehlenbachs, K., and Petersen, N., 1981, Heterogeneous alteration of the upper oceanic crust: Correlation of rock chemistry, magnetic properties, and O-isotope ratios with alteration patterns in basalts from Site 396B, DSDP. Journal of Geophysical Research, v. 86, p. 7935-7950. [Link]

Böhlke, J.K., Honnorez, J., and Honnorez-Guerstein, B.-M., 1980, Alteration of basalts from Site 396B, Deep Sea Drilling Project, petrographic and mineralogic studies. Contributions to Mineralogy and Petrology, v. 73, p. 341-364. [Link]






                           

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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