John Karl Bohlke

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 and Earth System Processes Division, Water Mission Area, US Geological Survey, Reston, Virginia (since 1991)

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

Publications (years in reverse):

Ariyarathna, T.S., Ballentine, M., Vlahos, P., Smith, R.W., Cooper, C., Böhlke, J.K., Fallis, S., Groshens, T.J., and Tobias, C.R., 2019, Tracing the cycling and fate of the munition, Hexahydro-1,3,5-trinitro-1,3,5-triazine in a simulated sandy coastal marine habitat with a stable isotopic tracer, 15N-[RDX]. Science of the Total Environment, v. 647, p. 369-378. http://doi.org/10.1016/j.scitotenv.2018.07.404

Boshers, D.S., Granger, J., Tobias, C.R., Böhlke, J.K., and Smith, R.L., 2019, Constraining the oxygen isotopic composition of nitrate produced by nitrification. Environmental Science and Technology, v. 53, p. 1206−1216.  http://doi.org/10.1021/acs.est.8b03386

Lin, Jiajia, Böhlke, J.K., Huang, S., Gonzalez-Meler, M., and Sturchio, N.C., 2019, Seasonality of nitrate sources and isotopic composition in the Upper Illinois River. Journal of Hydrology, v. 568, p. 849-861.  http://doi.org/10.1016/j.jhydrol.2018.11.043

Smith, R.L., and Böhlke, J.K., 2019, Methane and nitrous oxide temporal and spatial variability in two midwestern USA streams containing high nitrate concentrations. Science of the Total Environment, v. 685, p. 574-588,    http://doi.org/10.1016/j.scitotenv.2019.05.374

Smith, R.L., Repert, D.A., Stoliker, D.L., Kent, D.B., Song, B., LeBlanc, D.R., McCobb, T.D., Böhlke, J.K., Hyun, S.P., and Moon, H.S., In Press, Seasonal and spatial variation in the location and reactivity of a nitrate-contaminated groundwater discharge zone in a lakebed. Journal of Geophysical Research, Biogeosciences.

Ahdab, Y.D., Thiel, G.P., Böhlke, J.K., Stanton, J.S., and Lienhard, J.H., 2018, Minimum energy requirements for desalination of brackish groundwater in the United States with comparison to international datasets. Water Research, v. 141, p. 387-404.  http://doi.org/10.1016/j.watres.2018.04.015

Colman, J.A., LeBlanc, D.R., Böhlke, J.K., McCobb, T.D., Kroeger, K.D., Belaval, M., Cambareri, T.C., Pirolli, G.F., Brooks, T.W., Garren, M.E., Stover, T.B., and Keeley, A., 2018, Geochemical conditions and nitrogen transport in nearshore groundwater and the subterranean estuary at a Cape Cod embayment, East Falmouth, Massachusetts, 2013–14. U.S. Geological Survey Scientific Investigations Report 2018-5095, 69 p.  http://dx.doi.org/10.3133/sir20185095

Coplen, T.B., Holden, N.E., Wieser, M.E., and Böhlke, J.K., 2018, Clarification of the term “normal material” used for standard atomic weights (IUPAC Technical Report). Pure and Applied Chemistry, v. 90(7), p. 1221–1224.  http://doi.org/10.1515/pac-2017-0301

Hatzinger, P.B., Böhlke, J.K., Sturchio, N.C., Izbicki, J.A., and Teague, N.F., 2018, Four-dimensional isotopic approach to identify perchlorate sources in groundwater: Application to the Rialto-Colton and Chino subbasins, southern California (USA). Applied Geochemistry, v. 97, p. 213-225 (plus 38 p. Appendix).  http://doi.org/10.1016/j.apgeochem.2018.08.020

Hatzinger, P.B., Fuller, M.E., Sturchio, N.C., and Böhlke, J.K., 2018, Validation of stable isotope ratio analysis to document the biodegradation and natural attenuation of RDX, ESTCP Project ER-201208, Final Report. U.S. Department of Defense, Environmental Science and Technology Certification Program, 138 p.  http://www.serdp-estcp.org/Program-Areas/Environmental-Restoration/Contaminated-Groundwater/Persistent-Contamination/ER-201208

Holden, N.E. , Coplen, T.B., Böhlke, J.K., Tarbox, L.V., Benefield, J., de Laeter, J.R., Mahaffy, P.G., O’Connor, G., Roth, E., Tepper, D.H., Walczyk, T., Wieser, M.E., and Yoneda, S., 2018, IUPAC periodic table of the elements and isotopes (IPTEI) for the education community (IUPAC Technical Report). Pure and Applied Chemistry, v. 90(12), p. 1833–2092.   http://doi.org/10.1515/pac-2015-0703

Huntington, T.G., Pirolli, G.F., McCobb, T.D., Böhlke, J.K., Colman, J.A., Kroeger, K.D., Brooks, T.W., and LeBlanc, D.R., 2018, Geochemical data supporting analysis of geochemical conditions and nitrogen transport in nearshore groundwater and the subterranean estuary at a Cape Cod embayment, East Falmouth, Massachusetts. U.S. Geological Survey Data Release.  http://doi.org/10.5066/F7RR1WF0

Keisman, J., Blomquist, J., Böhlke, J.K., Davis-Martin, J., Dennison, W., Friedrichs, C., Murphy, R., Phillips, S., Testa, J., Trentacoste, E., and Weller, D., 2018, Integrating recent findings to explain water-quality change: Support for the mid-point assessment and beyond.  Chesapeake Bay Scientific and Technical Advisory Committee, STAC Publication 18-005, Edgewater, MD, 27 p.  http://www.chesapeake.org/pubs/394_Keisman2018.pdf

Lin, Jiajia, Huang, S., Böhlke, J.K., Gonzales-Meler, M., and Sturchio, N.C., 2018, Chemical and isotopic data for a study of seasonality of nitrate sources and isotopic composition in the Upper Illinois River, 2004-2008. U.S. Geological Survey Data Release, http://doi.org/10.5066/P93WD0TH.

Ostrom, N.E., Gandhi, H., Coplen, T.B., Toyoda, S., Böhlke, J.K., Brand, W.A., Casciotti, K.L., Dyckmans, J., Giesemann, A., Mohn, J., Well, R., Yu, L., and Yoshida, N., 2018, Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs. Rapid Communications in Mass Spectrometry, v. 32, p. 1207-1214.  http://dx.doi.org/10.1002/rcm.8157  [Plus Erratum, v. 32, p. 1829-1830. http://dx.doi.org/10.1002/rcm.8257]

Smith, R.L., and Böhlke, J.K., 2018, Methane and nitrous oxide temporal and spatial concentrations in the Iroquois River and Sugar Creek in northwestern Indiana and northeastern Illinois, 1999-2003. U.S. Geological Survey Data Release.  http://doi.org/10.5066/F7TH8KWZ

Böhlke, J.K., Mroczkowski, S.J., Sturchio, N.C., Heraty, L.J., Richman, K.W., Sullivan, D.B., Griffith, K.N., Gu, B., and Hatzinger, P.B., 2017, Stable isotope analyses of oxygen (18O:17O:16O) and chlorine (37Cl:35Cl) in perchlorate: Reference materials, calibrations, methods, and interferences. Rapid Communications in Mass Spectrometry, v. 31, p. 85-110.  http://dx.doi.org/10.1002/rcm.7751

Estrada, N.L., Böhlke, J.K., Sturchio, N.C., Gu, B., Harvey, G., Burkey, K.O., Grantz, D.A., MacGrath, M.T., Anderson, T.A., Rao, B., Sevanthi, R., Hatzinger, P.B., and Jackson, W.A., 2017, Stable isotopic composition of perchlorate and nitrate accumulated in plants: Hydroponic experiments and field data. Science of the Total Environment, v. 595, p. 556-566.  http://dx.doi.org/10.1016/j.scitotenv.2017.03.223

Messer, T.L., Burchell, M.R., Böhlke, J.K., and Tobias, C.R., 2017, Tracking the fate of nitrate through pulse-flow wetlands: A mesocosm scale 15N enrichment tracer study. Ecological Engineering, v. 106, p. 597-608.  http://dx.doi.org/10.1016/j.ecoleng.2017.06.016

Robertson, W.M., Böhlke, J.K., and Sharp, J.M.Jr., 2017, Response of deep groundwater to land use change in desert basins of the Trans-Pecos region, Texas, USA: Effects on infiltration, recharge, and nitrogen fluxes. Hydrological Processes, v. 31, p. 2349-2364.  http://dx.doi.org/10.1002/hyp.11178

Smith, R.L., Kent, D.B., Repert, D.A., and Böhlke, J.K., 2017, Anoxic nitrate reduction coupled with iron oxidation and attenuation of dissolved arsenic and phosphate in a sand and gravel aquifer. Geochimica et Cosmochimica Acta, v. 196, p. 102–120.  http://dx.doi.org/10.1016/j.gca.2016.09.025

Stanton, J.S., Anning, D.A., Brown, C.J., Moore, R.B., McGuire, V.L., Qi, S.L., Harris, A., Dennehy, K.F., McMahon, P.B., Degnan, J.R., and Böhlke, J.K., 2017, Brackish groundwater in the United States. U.S. Geological Survey Professional Paper 1833, 185 p.  http://dx.doi.org/10.3133/pp1833

Wood, W.W., and Böhlke, J.K., 2017, Density-driven free-convection model for isotopically fractionated geogenic nitrate in sabkha brine. Groundwater, v. 55, p. 199-207.  http://dx.doi.org/10.1111/gwat.12463

Degnan, J.R., Böhlke, J.K., Pelham, K., Langlais, D.M., and Walsh, G.J., 2016, Identification of groundwater nitrate contamination from explosives used in road construction: Isotopic, chemical, and hydrologic evidence. Environmental Science and Technology, v. 50, p. 593-603.  http://dx.doi.org/10.1021/acs.est.5b03671

Fuller, M.E., Heraty, L.B., Condee, C.W., Vainberg, S., Sturchio, N.C., Böhlke, J.K., Hatzinger, P.B., 2016. Relating carbon and nitrogen isotope effects to reaction mechanisms during aerobic or anaerobic degradation of RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) by pure bacterial cultures. Applied and Environmental Microbiology, v. 82, p. 3297-3309.  http://dx.doi.org/10.1128/AEM.00073-16

Hyer, K., Denver, J., Langland, M., Webber, J., Böhlke, J.K., Hively, W.D., and Clune, J.W., 2016, Spatial and temporal variation of stream chemistry associated with contrasting geology and land use patterns in the Chesapeake Bay watershed: Summary of results from Smith Creek, Virginia; Upper Chester River, Maryland; Conewago Creek, Pennsylvania; and Difficult Run, Virginia, 2010-2013. U.S. Geological Survey Scientific Investigations Report 2016-5093, 211 pp.  http://dx.doi.org/10.3133/sir20165093

Jackson, W.A., Davila, A.F., Böhlke, J.K., Sturchio, N.C., Sevanthi, R., Estrada, N., Brundrette, M., Lacelle, D., McKay, C.P., Poghosyan, A., Pollard, W., Zacny, K., 2016, Deposition, accumulation, and alteration of Cl-, NO3-, ClO4- and ClO3- salts in a hyper-arid polar environment: mass balance and isotopic constraints. Geochimica et Cosmochimica Acta, v. 182, p. 197-215.  http://dx.doi.org/10.1016/j.gca.2016.03.012

Jackson, W.A., Davila, A.F., Sears, D., Coates, J.D., McKay, C.P., Brundrett, M., Estrada, N., Böhlke, J.K., 2016, Corrigendum to “Widespread occurrence of (per)chlorate in the Solar System” [Earth Planet. Sci. Lett. 430 (2015) 470–476]. Earth and Planetary Science Letters, v. 436, p. 142-143.  http://dx.doi.org/10.1016/j.epsl.2015.12.031

Jurgens, B.C., Böhlke, J.K., Kauffman, L.J., Belitz, K., Esser, B.K., 2016. A partial exponential lumped parameter model to evaluate groundwater age distributions and nitrate trends in long-screened wells. Journal of Hydrology, v. 543A, p. 109–126.  http://dx.doi.org/10.1016/j.jhydrol.2016.05.011

McMahon, P.B., Böhlke, J.K., Dahm, K., Parkhurst, D.L., Anning, D.A., and Stanton, J.S., 2016, Chemical considerations for an updated national assessment of brackish groundwater resources. Groundwater, v. 54, p. 464-475.  http://dx.doi.org/10.1111/gwat.12367

Hatzinger, P.B., Böhlke, J.K., Sturchio, N.C., Izbicki, J.A., and Teague, N., 2015, Evaluation of perchlorate sources in the Rialto-Colton and Chino California subbasins using chlorine and oxygen isotope ratio analysis. U.S. Department of Defense, Environmental Science and Technology Certification Program, ER-200942 Final Report (published online). [Link]

Izbicki, J.A., Teague, N.F., Hatzinger, P.B., Böhlke, J.K., and Sturchio, N.C., 2015, Groundwater movement, recharge, and perchlorate occurrence in a faulted alluvial aquifer in California (USA). Hydrogeology Journal, v. 23, p. 467-491.  http://dx.doi.org/10.1007/s10040-014-1217-y

Jackson, W.A., Böhlke, J.K., Andraski, B.J., Fahlquist, L., Bexfield, L., Eckardt, F.D., Gates, J.B., Davila, A.F., McKay, C.P., Rao, B., Sevanthi, R., Rajagopalan, S., Estrada, N., Sturchio, N.C., Hatzinger, P.B., Anderson, T.A., Orris, G., Betancourt, J., Stonestrom, D., Latorre, C., Li, Y., and Harvey, G.J., 2015, Global patterns and environmental controls of perchlorate and nitrate co-occurrence in arid and semi-arid environments. Geochimica et Cosmochimica Acta, v. 164, p. 502-522.  http://dx.doi.org/10.1016/j.gca.2015.05.016

Jackson, W.A., Davila, A.F., Sears, D., Coates, J.D., McKay, C.P., Brundrette, M., Estrada, N., and Böhlke, J.K., 2015, Widespread occurrence of (per)chlorate in the solar system. Earth and Planetary Science Letters, v. 430, p. 470-476.  http://dx.doi.org/10.1016/j.epsl.2015.09.003

Smith, R.L., Böhlke, J.K., Song, B., and Tobias, C.R., 2015, Role of anaerobic ammonium oxidation (anammox) in nitrogen removal from a freshwater aquifer. Environmental Science and Technology, v. 49, p. 12169-12177.  http://dx.doi.org/10.1021/acs.est.5b02488

Smith, R.W., Vlahos, P., Böhlke, J.K., Ariyarathna, T., Ballentine, M., Cooper, C., Fallis, S., Groshens, T.J., and Tobias, C., 2015, Tracing the cycling and fate of the explosive 2,4,6-trinitrotoluene in coastal marine systems with a stable isotopic tracer, 15N – [TNT]. Environmental Science and Technology, v. 49, p. 12223-12231.  http://dx.doi.org/doi:10.1021/acs.est.5b02907

Andraski, B.J., Jackson, W.A., Welborn, T.L., Böhlke, J.K., and Stonestrom, D.A., 2014, Soil, plant, and terrain effects on natural perchlorate distribution in a desert landscape. Journal of Environmental Quality, v. 43, p. 980-994.  http://dx.doi.org/doi:10.2134/jeq2013.11.0453

Böhlke, J.K., 2014, Variation in the terrestrial isotopic composition and atomic weight of argon. Pure and Applied Chemistry, v. 86, p. 1421-1432.  http://dx.doi.org/10.1515/pac-2013-0918

Böhlke, J.K., Jurgens, B.C., Uselmann, D.J., and Eberts, S.M., 2014, Educational webtool illustrating groundwater age effects on contaminant trends in wells. Groundwater, v. 52 (S1), p. 8-9 (plus 19p Appendix).  http://dx.doi.org/10.1111/gwat.12261

Böhlke, J.K., Jurgens, B.C., Uselmann, D.J., and Eberts, S.M., 2014, GAMACTT: Groundwater age mixtures and contaminant trends tool. USGS online interactive webtool, available at https://ca.water.usgs.gov/projects/gamactt/

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.  http://openjournals.neu.edu/aes/journal/article/view/v7art3/v7p31-46

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. https://pubs.usgs.gov/circ/1383g/

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.  http://dx.doi.org/10.1002/wrcr.20492

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.  http://dx.doi.org/10.1016/j.copbio.2012.11.010

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.  http://dx.doi.org/10.1351/PAC-REP-13-03-02

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.  http://dx.doi.org/10.1007/s10040-011-0810-6

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.  http://dx.doi.org/10.1007/s10040-012-0844-4

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.  http://pubs.usgs.gov/tm/4-f3

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.  http://dx.doi.org/10.1029/2011WR011008

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.  http://dx.doi.org/10.1111/j.1745-6584.2010.00792.x

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.

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]

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]

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.

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

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]

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]

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]

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]

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]

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]

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]

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]

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]

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).

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]

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]

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]

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., 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]

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]

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]

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]

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]

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]

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]

McMahon, P.B., and Böhlke, J.K., 2007, Transport- Linking the chemistry of recharge and the used resource in the High Plains Aquifer. inMcMahon, 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]

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]

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]

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]

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]

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]

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]

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]

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]

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]

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.

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]

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).

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]

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]

Coplen, T.B., Böhlke, J.K, and Casciotti, K.L., 2004, Using dual bacterial denitrification to improve δ15N determinations of nitrates containing mass independent 17O. Rapid Communications in Mass Spectrometry, v. 18, p. 245-250. [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]

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]

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]

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]

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]

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]

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]

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]

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]

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]

Qi, H., Coplen, T. B., Geilman, H., Brand, W.A., and Böhlke, J.K, 2003, Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil. Rapid Communications in Mass Spectrometry, v. 17, p. 2483-2487. [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]

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]

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

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

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]

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).

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]

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.

Revesz, K., and Böhlke, J.K., 2002, Comparison of δ18O 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 Δ17O nitrate reference material. Analytical Chemistry, v. 74, p. 4989-4993. [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]

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]

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]

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]

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]

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]

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]

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]

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.

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]

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]

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]

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]

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]

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 δ2H, δ18O, and dissolved gases, U.S. Geological Survey Water-Resources Investigations Report 99-4018C, p. 337-348. [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]

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, δ18O and δ15N 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 δ18O and δ15N 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. [Link]

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]