Karen Casciotti

Click for Stanford Login

For local admin account, login below.

Victoria and Roger Sant Director, Earth Systems Program, Professor of Earth System Science and Senior Fellow at the Woods Institute for the Environment

Contact Information

Email: kcasciotti@stanford.edu

Internet Links:

Lab Website

Document Links:

Curriculum Vitae PDF

Group

Bio

Professor, Earth System Science
Senior Fellow, Stanford Woods Institute for the Environment
Member, Bio-X

Administrative Appointments

Professor, ESS Department, Stanford University (2020 - Present)
Victoria and Roger Sant Director, Earth Systems Program, Stanford University (2019 - Present)
Associate Professor, ESS Department, Stanford University (2015 - 2020)
Assistant Professor, EESS Department, Stanford University (2011 - 2015)
Associate Scientist, MC&G Department, Woods Hole Oceanographic Institution (2008 - 2010)
Assistant Scientist, MC&G Department, Woods Hole Oceanographic Institution (2004 - 2008)
NRC Postdoctoral Fellow, US Geological Survey, Reston VA (2002 - 2004)

Honors and Awards

John Hayes Award, Geochemical Society (2020)
Terman Fellow, Stanford University (2011)
WHOI Coastal Ocean Institute Fellow, Woods Hole Oceanographic Institute (WHOI ) (2008-2011)
NRC Postdoctoral Research Associateship, National Research Council (2002)
Harold W. Dodds Honorific Fellowship, Princeton University (2001)

University Service and Professional Activities

Co-Chair, GEOTRACES Scientific Steering Committee, GEOTRACES (2020 - Present)
Chair, Gordon Research Conference in Chemical Oceanography (2017), GRC (2015 - 2017)
Standards and Intercalibration Committee member, GEOTRACES (2014 - Present)
Ocean Sciences Meeting Program Committee Co-Chair (2016), American Geophysical Union (2014 - 2016)
Executive Committee, Ocean Sciences Section, American Geophysical Union (2013 - 2016)
Ocean Sciences Meeting Program Committee Member (2014), American Geophysical Union (2013 - 2016)
Vice-Chair, Gordon Research Conference in Chemical Oceanography (2015), GRC (2013 - 2015)
GEOTRACES Steering Committee member, US GEOTRACES (2012 - 2017)
Associate Editor, Marine Chemistry (2009 - 2020)
Intercalibration coordinator for GEOTRACES nitrate isotope measurements, GEOTRACES (2007 - Present)
Associate Editor, Limnology and Oceanography Methods (2006 - 2016)

Education

Ph.D., Princeton University, Geosciences (2002)
M.S., Princeton University, Geosciences (1999)
M.S., UCSD Scripps Institution of Oceanography, Oceanography (1998)
B.S., California Institute of Technology, Environmental Engineering Science (1995)

Research & Scholarship

Current Research and Scholarly Interests

Research
My research focuses on nitrogen cycle biogeochemistry, including how nitrate, nitrite, and nitrous oxide (N2O) are produced and consumed in ocean waters. Nitrate and nitrite are important nutrients for marine photosynthesis, and N2O is a climatically important trace gas. I take an interdisciplinary approach to these questions, applying tools from stable isotope geochemistry, geochemical modeling, microbiology and molecular biology.

Teaching
I teach Marine Chemistry (EESS 152/252), Marine Stable Isotopes (EESS 249), and co-teach Measurements in Earth Systems (EESS 212)

Professional Activities
Executive Committee AGU/Ocean Sciences Section 2013-present; Program Committee for the Ocean Sciences Meeting in 2014 and Co-Chair in 2016; US GEOTRACES Steering Committee January 2012-present; Associate Editor, Limnology and Oceanography: Methods, 2006-present; Associate Editor, Marine Chemistry, 2009-present; Intercalibration coordinator for GEOTRACES nitrate isotope measurements, 2007-present.

Attended GEOTRACES scoping workshops for the Pacific Ocean (June 25-30, 2007) and Indian Ocean (October 24-26, 2007), implementation workshops for the Atlantic Ocean (September 22-24, 2008) and Pacific Ocean (October 1-3, 2008), intercalibration workshops (December 8-9, 2007 and December 13-14, 2008), North Atlantic Section data workshop (March 11-15, 2013), Pacific Section cruise planning meeting (April 24-26, 2013).

Reviewer for NSF (OCE CO and BO, MIP/MO, ETBC, Ecosystems, Chemistry, PIRE), as well as the following journals: Science, Nature, Nature Geoscience, ISME Journal, Environmental Microbiology, PLOS Biology, Limnology and Oceanography, Limnology and Oceanography: Methods, Global Biogeochemical Cycles, Marine Chemistry, Deep Sea Research, Applied and Environmental Microbiology, Analytical Chemistry, Progress in Oceanography, Journal of Geophysical Research, Geophysical Research Letters, Rapid Communications in Mass Spectrometry, Geochimica et Cosmochimica Acta, and two chapters for the new edition of Nitrogen in the Marine Environment.

Teaching

Courses Taught

2021-22

Biology and Global Change
EARTHSYS 111 (Win)
Marine Chemistry
EARTHSYS 152, EARTHSYS 252, ESS 152, ESS 252 (Spr)
Nitrogen in the Marine Environment
ESS 275 (Win)

Independent Study Courses

Directed Individual Study in Earth Systems
EARTHSYS 297 (Aut, Win, Spr)
Directed Reading in Environment and Resources
ENVRES 398 (Aut, Win, Spr, Sum)
Directed Research
EARTHSYS 250 (Aut, Win, Spr)
Directed Research in Environment and Resources
ENVRES 399 (Aut, Win, Spr, Sum)
Graduate Research
ESS 400 (Aut, Win, Spr, Sum)
Honors Program in Earth Systems
EARTHSYS 199 (Win, Spr)

2020-21

Biology and Global Change
BIO 117, EARTHSYS 111, EARTHSYS 217 (Win)
Marine Chemistry
EARTHSYS 152, EARTHSYS 252, ESS 152, ESS 252 (Spr)
Marine Stable Isotopes
ESS 249 (Win)

Independent Study Courses

Directed Individual Study in Earth Systems
EARTHSYS 297 (Win, Spr)
Directed Reading in Environment and Resources
ENVRES 398 (Aut, Win, Spr, Sum)
Directed Research
EARTHSYS 250 (Win, Spr)
Directed Research in Environment and Resources
ENVRES 399 (Aut, Win, Spr, Sum)
Graduate Research
ESS 400 (Aut, Win, Spr, Sum)
Honors Program in Earth Systems
EARTHSYS 199 (Win, Spr)

2019-20

Biology and Global Change
BIO 117, EARTHSYS 111, ESS 111 (Win)
Marine Chemistry
EARTHSYS 152, EARTHSYS 252, ESS 152, ESS 252 (Spr)
Nitrogen in the Marine Environment
ESS 275 (Win)

Independent Study Courses

Directed Individual Study in Earth Systems
EARTHSYS 297 (Win, Spr)
Directed Reading in Environment and Resources
ENVRES 398 (Aut, Win, Spr, Sum)
Directed Research
EARTHSYS 250 (Win, Spr)
Directed Research in Environment and Resources
ENVRES 399 (Aut, Win, Spr, Sum)
Graduate Research
ESS 400 (Aut, Win, Spr, Sum)
Honors Program in Earth Systems
EARTHSYS 199 (Win, Spr)

2018-19

Marine Chemistry
EARTHSYS 152, EARTHSYS 252, ESS 152, ESS 252 (Spr)
Marine Stable Isotopes
ESS 249 (Win)

Independent Study Courses

Directed Individual Study in Earth Systems
EARTHSYS 297 (Win, Spr)
Directed Reading in Environment and Resources
ENVRES 398 (Aut, Win, Spr, Sum)
Directed Research
EARTHSYS 250 (Win, Spr)
Directed Research in Environment and Resources
ENVRES 399 (Aut, Win, Spr, Sum)
Graduate Research
ESS 400 (Aut, Win, Spr, Sum)
Honors Program in Earth Systems
EARTHSYS 199 (Win, Spr)

Advisors/Advisees

Advisees:

Doctoral (Program): Colette Kelly, Nicole Travis
Doctoral Dissertation Reader (AC): Lizzie Paulus
Master's Program Advisor: Patrick Monreal
Postdoctoral Faculty Sponsor: Avanti Shrikumar

Publications

Nitrification and Nitrous Oxide Production in the Offshore Waters of the Eastern Tropical South Pacific GLOBAL BIOGEOCHEMICAL CYCLES Santoro, A. E., Buchwald, C., Knapp, A. N., Berelson, W. M., Capone, D. G., Casciotti, K. L. 2021; 35 (2)
Quantifying Nitrous Oxide Cycling Regimes in the Eastern Tropical North Pacific Ocean With Isotopomer Analysis Global Biogeochemical Cycles Kelly, C. L., Travis, N. M., Baya, P. A., Casciotti, K. L. 2021; 35 (2): e2020GB006637
Microbial N2O consumption in and above marine N2O production hotspots. The ISME journal Sun, X., Jayakumar, A., Tracey, J. C., Wallace, E., Kelly, C. L., Casciotti, K. L., Ward, B. B. 2020
Vertical stratification and stability of biogeochemical processes in the deep saline waters of Lake Vanda, Antarctica LIMNOLOGY AND OCEANOGRAPHY Schutte, C. A., Samarkin, V. A., Peters, B., Madigan, M. T., Bowles, M., Morgan-Kiss, R., Casciotti, K., Joye, S. 2020; 65 (3): 569–81
Amperometric sensor for nanomolar nitrous oxide analysis. Analytica chimica acta Damgaard, L. R., Kelly, C. n., Casciotti, K. n., Ward, B. B., Revsbech, N. P. 2020; 1101: 135–40
Distribution of Concentration and Stable Isotopic Composition of N2O in the Shelf and Slope of the Northern South China Sea: Implications for Production and Emission JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Zhang, G., Liu, S., Casciotti, K. L., Forbes, M. S., Gu, X., Ren, Y., Zheng, W. 2019; 124 (8): 6218–34
Evidence for Microbial Mediated NO3- Cycling Within Floodplain Sediments During Groundwater Fluctuations FRONTIERS IN EARTH SCIENCE Bouskill, N. J., Conrad, M. E., Bill, M., Brodie, E. L., Cheng, Y., Hobson, C., Forbes, M., Casciotti, K. L., Williams, K. H. 2019; 7
Dual nitrogen and oxygen isotope fractionation during anaerobic ammonium oxidation by anammox bacteria. The ISME journal Kobayashi, K., Makabe, A., Yano, M., Oshiki, M., Kindaichi, T., Casciotti, K. L., Okabe, S. 2019
Modeling oceanic nitrate and nitrite concentrations and isotopes using a 3-D inverse N cycle model BIOGEOSCIENCES Martin, T. S., Primeau, F., Casciotti, K. L. 2019; 16 (2): 347–67
An N isotopic mass balance of the Eastern Tropical North Pacific oxygen deficient zone Fuchsman, C. A., Devol, A. H., Casciotti, K. L., Buchwald, C., Chang, B. X., Horak, R. A. PERGAMON-ELSEVIER SCIENCE LTD. 2018: 137–47
Estimating fixed nitrogen loss and associated isotope effects using concentration and isotope measurements of NO3-, NO2-, and N-2 from the Eastern Tropical South Pacific oxygen deficient zone Peters, B., Horak, R., Devol, A., Fuchsman, C., Forbes, M., Mordy, C. W., Casciotti, K. L. PERGAMON-ELSEVIER SCIENCE LTD. 2018: 121–36
The GEOTRACES Intermediate Data Product 2017 CHEMICAL GEOLOGY Schlitzer, R., Anderson, R. F., Dodas, E., Lohan, M., Geibere, W., Tagliabue, A., Bowie, A., Jeandel, C., Maldonado, M. T., Landing, W. M., Cockwell, D., Abadie, C., Abouchami, W., Achterberg, E. P., Agather, A., Aguliar-Islas, A., van Aken, H. M., Andersen, M., Archer, C., Auro, M., de Baar, H. J., Baars, O., Baker, A. R., Bakker, K., Basak, C., Baskaran, M., Bates, N. R., Bauch, D., van Beek, P., Behrens, M. K., Black, E., Bluhm, K., Bopp, L., Bouman, H., Bowman, K., Bown, J., Boyd, P., Boye, M., Boyle, E. A., Branellec, P., Bridgestock, L., Brissebrat, G., Browning, T., Bruland, K. W., Brumsack, H., Brzezinski, M., Buck, C. S., Buck, K. N., Buesseler, K., Bull, A., Butler, E., Cai, P., Camara Mor, P., Cardinal, D., Carlson, C., Carrasco, G., Casacuberta, N., Casciotti, K. L., Castrillejo, M., Chamizo, E., Chance, R., Charette, M. A., Chaves, J. E., Cheng, H., Chever, F., Christl, M., Church, T. M., Closset, I., Colman, A., Conway, T. M., Cossa, D., Croot, P., Cullen, J. T., Cutter, G. A., Daniels, C., Dehairs, F., Deng, F., Dieu, H., Duggan, B., Dulaquais, G., Dumousseaud, C., Echegoyen-Sanz, Y., Edwards, R., Ellwood, M., Fahrbach, E., Fitzsimmons, J. N., Flegal, A., Fleisher, M. Q., van de Flierdt, T., Frank, M., Friedrich, J., Fripiat, F., Froellje, H., Galer, S. G., Gamo, T., Ganeshram, R. S., Garcia-Orellana, J., Garcia-Solsona, E., Gault-Ringold, M., George, E., Gerringa, L. A., Gilbert, M., Godoy, J. M., Goldstein, S. L., Gonzalez, S. R., Grissom, K., Hammerschmidt, C., Hartman, A., Hassler, C. S., Hathorne, E. C., Hatta, M., Hawco, N., Hayes, C. T., Heimburger, L., Helgoe, J., Heller, M., Henderson, G. M., Henderson, P. B., van Heuven, S., Ho, P., Horner, T. J., Hsieh, Y., Huang, K., Humphreys, M. P., Isshiki, K., Jacquot, J. E., Janssen, D. J., Jenkins, W. J., John, S., Jones, E. M., Jones, J. L., Kadko, D. C., Kayser, R., Kenna, T. C., Khondoker, R., Kim, T., Kipp, L., Klar, J. K., Klunder, M., Kretschmer, S., Kumamoto, Y., Laan, P., Labatut, M., Lacan, F., Lam, P. J., Lambelet, M., Lamborg, C. H., Le Moigne, F. C., Le Roy, E., Lechtenfeld, O. J., Lee, J., Lherminier, P., Little, S., Lopez-Lora, M., Lu, Y., Masque, P., Mawji, E., Mcclain, C. R., Measures, C., Mehic, S., Barraqueta, J., van der Merwe, P., Middag, R., Mieruch, S., Milne, A., Minami, T., Moffett, J. W., Moncoiffe, G., Moore, W. S., Morris, P. J., Morton, P. L., Nakaguchi, Y., Nakayama, N., Niedermiller, J., Nishioka, J., Nishiuchi, A., Noble, A., Obata, H., Ober, S., Ohnemus, D. C., van Ooijen, J., O'Sullivan, J., Owens, S., Pahnke, K., Paul, M., Pavia, F., Pena, L. D., Petersh, B., Planchon, F., Planquette, H., Pradoux, C., Puigcorbe, V., Quay, P., Queroue, F., Radic, A., Rauschenberg, S., Rehkamper, M., Rember, R., Remenyi, T., Resing, J. A., Rickli, J., Rigaud, S., Rijkenberg, M. A., Rintoul, S., Robinson, L. F., Roca-Marti, M., Rodellas, V., Roeske, T., Rolison, J. M., Rosenberg, M., Roshan, S., van der Loaff, M., Ryabenko, E., Saito, M. A., Salt, L. A., Sanial, V., Sarthou, G., Schallenberg, C., Schauer, U., Scher, H., Schlosser, C., Schnetger, B., Scott, P., Sedwick, P. N., Semiletov, I., Shelley, R., Sherrell, R. M., Shiller, A. M., Sigman, D. M., Singh, S., Slagter, H. A., Slater, E., Smethie, W. M., Snaith, H., Sohrin, Y., Sohst, B., Sonke, J. E., Speich, S., Steinfeldt, R., Stewart, G., Stichel, T., Stirling, C. H., Stutsman, J., Swarr, G. J., Swift, J. H., Thomas, A., Thorne, K., Till, C. P., Till, R., Townsend, A. T., Townsend, E., Tuerena, R., Twining, B. S., Vance, D., Velazquez, S., Venchiarutti, C., Villa-Alfageme, M., Vivancos, S. M., Voelker, A. L., Wake, B., Warner, M. J., Watson, R., van Weerlee, E., Weigand, M., Weinstein, Y., Weiss, D., Wisotzki, A., Woodward, E. S., Wu, J., Wu, Y., Wuttig, K., Wyatt, N., Xiang, Y., Xie, R. C., Xue, Z., Yoshikawa, H., Zhang, J., Zhang, P., Zhao, Y., Zheng, L., Zheng, X., Zieringer, M., Zimmer, L. A., Ziveri, P., Zunino, P., Zurbrick, C. 2018; 493: 210–23
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 Ostrom, N. E., Gandhi, H., Coplen, T. B., Toyoda, S., Bohlke, J. K., Brand, W. A., Casciotti, K. L., Dyckmans, J., Giesemann, A., Mohn, J., Well, R., Yu, L., Yoshida, N. 2018; 32 (15): 1207–14
Ammonia-oxidizing bacteria are the primary N2O producers in an ammonia-oxidizing archaea dominated alkaline agricultural soil ENVIRONMENTAL MICROBIOLOGY Meinhardt, K. A., Stopnisek, N., Pannu, M. W., Strand, S. E., Fransen, S. C., Casciotti, K. L., Stahl, D. A. 2018; 20 (6): 2195–2206
Nitrogen and oxygen isotope measurements of nitrate along the US GEOTRACES Eastern Pacific Zonal Transect (GP16) yield insights into nitrate supply, remineralization, and water mass transport Peters, B. D., Lam, P. J., Casciotti, K. L. ELSEVIER SCIENCE BV. 2018: 137–50
Water mass analysis of the 2013 US GEOTRACES eastern Pacific zonal transect (GP16) Peters, B. D., Jenkins, W. J., Swift, J. H., German, C. R., Moffett, J. W., Cutter, G. A., Brzezinski, M. A., Casciotti, K. L. ELSEVIER SCIENCE BV. 2018: 6–19
Tropical Dominance of N-2 Fixation in the North Atlantic Ocean GLOBAL BIOGEOCHEMICAL CYCLES Marconi, D., Sigman, D. M., Casciotti, K. L., Campbell, E. C., Weigand, M., Fawcett, S. E., Knapp, A. N., Rafter, P. A., Ward, B. B., Haug, G. H. 2017; 31 (10): 1608–23
Paired N and O isotopic analysis of nitrate and nitrite in the Arabian Sea oxygen deficient zone DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS Martin, T. S., Casciotti, K. L. 2017; 121: 121-131
Multiple metabolisms constrain the anaerobic nitrite budget in the Eastern Tropical South Pacific GLOBAL BIOGEOCHEMICAL CYCLES Babbin, A. R., Peters, B. D., Mordy, C. W., Widner, B., Casciotti, K. L., Ward, B. B. 2017; 31 (2): 258-271
Controls of nitrogen cycling evaluated along a well-characterized climate gradient. Ecology von Sperber, C., Chadwick, O. A., Casciotti, K. L., Peay, K. G., Francis, C. A., Kim, A. E., Vitousek, P. M. 2017
Hydrothermal impacts on trace element and isotope ocean biogeochemistry PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES German, C. R., Casciotti, K. A., Dutay, J., Heimburger, L. E., Jenkins, W. J., Measures, C. I., Mills, R. A., Obata, H., Schlitzer, R., Tagliabue, A., Turner, D. R., Whitby, H. 2016; 374 (2081)
Nitrite isotopes as tracers of marine N cycle processes PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES Casciotti, K. L. 2016; 374 (2081)
Vertical modeling of the nitrogen cycle in the eastern tropical South Pacific oxygen deficient zone using high-resolution concentration and isotope measurements GLOBAL BIOGEOCHEMICAL CYCLES Peters, B. D., Babbin, A. R., Lettmann, K. A., Mordy, C. W., Ulloa, O., Ward, B. B., Casciotti, K. L. 2016; 30 (11): 1661-1681
Differential N2O dynamics in two oxygen-deficient lake basins revealed by stable isotope and isotopomer distributions LIMNOLOGY AND OCEANOGRAPHY Wenk, C. B., Frame, C. H., Koba, K., Casciotti, K. L., Veronesi, M., Niemann, H., Schubert, C. J., Yoshida, N., Toyoda, S., Makabe, A., Zopfi, J., Lehmann, M. F. 2016; 61 (5): 1735-1749
Variable Nitrification Rates Across Environmental Gradients in Turbid, Nutrient-Rich Estuary Waters of San Francisco Bay ESTUARIES AND COASTS Damashek, J., Casciotti, K. L., Francis, C. A. 2016; 39 (4): 1050-1071
Nitrogen and oxygen isotopic fractionation during microbial nitrite reduction LIMNOLOGY AND OCEANOGRAPHY Martin, T. S., Casciotti, K. L. 2016; 61 (3): 1134-1143
Low rates of nitrogen fixation in eastern tropical South Pacific surface waters PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Knapp, A. N., Casciotti, K. L., Berelson, W. M., Prokopenko, M. G., Capone, D. G. 2016; 113 (16): 4398-4403
Nitrogen and Oxygen Isotopic Studies of the Marine Nitrogen Cycle ANNUAL REVIEW OF MARINE SCIENCE, VOL 8 Casciotti, K. L. 2016; 8: 379-407
Nitrogen and Oxygen Isotopic Studies of the Marine Nitrogen Cycle. Annual review of marine science Casciotti, K. L. 2016; 8: 379–407
Nitrite isotopes as tracers of marine N cycle processes. Philosophical transactions. Series A, Mathematical, physical, and engineering sciences Casciotti, K. L. 2016; 374 (2081)
Nitrate isotope distributions on the US GEOTRACES North Atlantic cross-basin section: Signals of polar nitrate sources and low latitude nitrogen cycling MARINE CHEMISTRY Marconi, D., Weigand, M. A., Rafter, P. A., McIlvin, M. R., Forbes, M., Casciotti, K. L., Sigman, D. M. 2015; 177: 143-156
Nitrogen cycling in the secondary nitrite maximum of the eastern tropical North Pacific off Costa Rica GLOBAL BIOGEOCHEMICAL CYCLES Buchwald, C., Santoro, A. E., Stanley, R. H., Casciotti, K. L. 2015; 29 (12): 2061-2081
Intense nitrogen cycling in permeable intertidal sediment revealed by a nitrous oxide hot spot GLOBAL BIOGEOCHEMICAL CYCLES Schutte, C. A., Joye, S. B., Wilson, A. M., Evans, T., Moore, W. S., Casciotti, K. 2015; 29 (10): 1584-1598
Aspects of the marine nitrogen cycle of the Chukchi Sea shelf and Canada Basin DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY Brown, Z. W., Casciotti, K. L., Pickart, R. S., Swift, J. H., Arrigo, K. R. 2015; 118: 73-87
Stable Isotopes and Iron Oxide Mineral Products as Markers of Chemodenitrification ENVIRONMENTAL SCIENCE & TECHNOLOGY Jones, L. C., Peters, B., Pacheco, J. S., Casciotti, K. L., Fendorf, S. 2015; 49 (6): 3444-3452
N2O production in the eastern South Atlantic: Analysis of N2O stable isotopic and concentration data GLOBAL BIOGEOCHEMICAL CYCLES Frame, C. H., Deal, E., Nevison, C. D., Casciotti, K. L. 2014; 28 (11): 1262-1278
Interlaboratory assessment of nitrous oxide isotopomer analysis by isotope ratio mass spectrometry and laser spectroscopy: current status and perspectives RAPID COMMUNICATIONS IN MASS SPECTROMETRY Mohn, J., Wolf, B., Toyoda, S., Lin, C., Liang, M., Brueggemann, N., Wissel, H., Steiker, A. E., Dyckmans, J., Szwec, L., Ostrom, N. E., Casciotti, K. L., Forbes, M., Giesemann, A., Well, R., Doucett, R. R., Yarnes, C. T., Ridley, A. R., Kaiser, J., Yoshida, N. 2014; 28 (18): 1995-2007
Placing an upper limit on cryptic marine sulphur cycling NATURE Johnston, D. T., Gill, B. C., Masterson, A., Beirne, E., Casciotti, K. L., Knapp, A. N., Berelson, W. 2014; 513 (7519): 530-?
Differential contributions of archaeal ammonia oxidizer ecotypes to nitrification in coastal surface waters. ISME journal Smith, J. M., Casciotti, K. L., Chavez, F. P., Francis, C. A. 2014; 8 (8): 1704-1714
Stable isotope analyses of NO2-, NO3-, and N2O in the hypersaline ponds and soils of the McMurdo Dry Valleys, Antarctica GEOCHIMICA ET COSMOCHIMICA ACTA Peters, B., Casciotti, K. L., Samarkin, V. A., Madigan, M. T., Schutte, C. A., Joye, S. B. 2014; 135: 87-101
Stable isotopic analyses of NO2-, NO3-, and N2O in hypersaline ponds and soils of the McMurdo Dry Valleys, Antarctica Geochimica et Cosmochimica Acta Peters, B., Casciotti, K. L., Samarkin, V. A., Madigan, M. T., Schutte, C. A., Joye, S. B. 2014
Differential contributions of archaeal ammonia oxidizer ecotypes to nitrification in coastal surface waters ISME Journal Smith, J. M., Casciotti, K. L., Chavez, F. P., Francis, C. A. 2014
Aspects of the marine nitrogen cycle on the Chukchi Sea shelf and Canada Basin Deep Sea Research II Browh, Z. W., Casciotti, K. L., Pickart, R. L., Swift, J. H., Arrigo, K. R. 2014
Implications of nitrate and nitrite isotopic measurements for the mechanisms of nitrogen cycling in the Peru oxygen deficient zone DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS Casciotti, K. L., Buchwald, C., McIlvin, M. 2013; 80: 78-93
Stable Isotopes as Tracers of Anthropogenic Nitrogen Sources, Deposition, and Impacts ELEMENTS Hastings, M. G., Casciotti, K. L., Elliott, E. M. 2013; 9 (5): 339-344
Excess nitrate loads to coastal waters reduces nitrate removal efficiency: mechanism and implications for coastal eutrophication ENVIRONMENTAL MICROBIOLOGY Lunau, M., Voss, M., Erickson, M., Dziallas, C., Casciotti, K., Ducklow, H. 2013; 15 (5): 1492-1504
Isotopic ratios of nitrite as tracers of the sources and age of oceanic nitrite NATURE GEOSCIENCE Buchwald, C., Casciotti, K. L. 2013; 6 (4): 308-313
Measurements of nitrite production in and around the primary nitrite maximum in the central California Current BIOGEOSCIENCES Santoro, A. E., Sakamoto, C. M., Smith, J. M., Plant, J. N., Gehman, A. L., Worden, A. Z., Johnson, K. S., Francis, C. A., Casciotti, K. L. 2013; 10 (11): 7395-7410
Insights on the marine microbial nitrogen cycle from isotopic approaches to nitrification. Frontiers in microbiology Casciotti, K. L., Buchwald, C. 2012; 3: 356-?
Insights on the marine microbial nitrogen cycle from isotopic approaches to nitrification FRONTIERS IN MICROBIOLOGY Casciotti, K. L., Buchwald, C. 2012; 3
Potential importance of physiologically diverse foraminifera in sedimentary nitrate storage and respiration Journal of Geophysical Research: Biogeosciences Bernhard, J. M., Casciotti, K. L., McIlvin, M. R., Beaudoin , D. J., Visscher, P. T., Edgcomb, V. P. 2012; 117
Distribution of anaerobic ammonia-oxidizing bacteria in a subterranean estuary Marine Chemistry Saenz, J. P., Hopmans, E. C., Rogers, D., Henderson, P., Charette, M. A., Casciotti, K. L., Shouten, S., Sinninghe-Damste, J. S., Eglinton, T. I. 2012; 136-137: 7-13
Oxygen isotopic composition of nitrate and nitrite produced by nitrifying co-cultures and natural marine assemblages Limnology and Oceanography Buchwald, C., Santoro, A., McIlvin, M., Casciotti, K. L. 2012; 57: 1361-1375
Denitrification likely catalyzed by endobionts in an allogromiid foraminifer Multidisciplinary Journal of Microbial Ecology (ISME Journal) Bernhard, J. M., Edgcomb, V. P., Casciotti, K. L., McIlvin, M. R., Beaudoin, D. J. 2012; 6 (5): 951-960
Basin-scale input of cobalt, iron, and manganese from the Benguela-Angola front to the South Atlantic Ocean Limnology and Oceanography Noble, A. E., Lamborg, C. H., Ohnemus, D. C., Lam, P. J., Goepfert, T. J., Measures, C. I., Frame, C. H., Casciotti, K. L., DiTullio, G. R., Jennings, J., Saito, K. A. 2012; 57 (4): 989-1010
Isotopic Signature of N2O Produced by Marine Ammonia-Oxidizing Archaea SCIENCE Santoro, A. E., Buchwald, C., McIlvin, M. R., Casciotti, K. L. 2011; 333 (6047): 1282-1285
Technical Updates to the Bacterial Method for Nitrate Isotopic Analyses ANALYTICAL CHEMISTRY McIlvin, M. R., Casciotti, K. L. 2011; 83 (5): 1850-1856
Enrichment and characterization of ammonia-oxidizing archaea from the open ocean: phylogeny, physiology, and stable isotope fractionation Multidisciplinary Journal of Microbial Ecology (ISME Journal) Santoro, A. E., Casciotti, K. L. 2011; 5: 1796-1808
Nitrous oxide dynamics in a braided river system, New Zealand Journal of Environmental Quality Clough, T. J., Buckthought, L. E., Casciotti, K. L., Keliher, F. M., Jones, P. K. 2011; 40: 1532-1541
Activity, abundance and diversity of nitrifying archaea and bacteria in the central California Current ENVIRONMENTAL MICROBIOLOGY Santoro, A. E., Casciotti, K. L., Francis, C. A. 2010; 12 (7): 1989-2006
Abundance and diversity of archaeal ammonia oxidizers in a coastal groundwater aquifer Applied and Environmental Microbiology Rogers, D., Casciotti, K. L. 2010; 76: 7938-7948
Oxygen isotopic exchange and fractionation during bacterial nitrite oxidation Limnology and Oceanography Buchwald, C., Casciotti, K. L. 2010; 55: 1064-1074
Novel strains isolated from a coastal aquifer suggest a predatory role for flavobacteria Federation of European Microbiological Societies (FEMS) Microbiology Ecology Banning, E. C., Casciotti, K. L., Kujawinski, E. B. 2010; 73: 254-270
Assessment of nitrogen and oxygen isotopic fractionation during nitrification and its expression in the marine environment Methods in Enzymology Casciotti, K. L., Buchwald, C., Santoro, A. E., Frame, C. H. 2010; 486: 253-280
Biogeochemical controls and isotopic signatures of nitrous oxide production by a marine ammonia-oxidizing bacterium Biogeosciences Frame, C. H., Casciotti, K. L. 2010; 7: 2695-2709
Abiotic nitrous oxide emission from the hypersaline Don Juan Pond in Antarctica Nature Geoscience Samarkin, V. A., Madigan, M. T., Bowles, M. W., Casciotti, K. L., Priscu, J. C., McKay, C. P., Joye, S. B. 2010; 3: 341-344
Fully automated system for stable isotopic analyses of dissolved nitrous oxide at natural abundance levels Limnology and Oceanography: Methods McIlvin , M. R., Casciotti, K. L. 2010; 8: 54-66
Inverse Kinetic Isotope Fractionation During Bacterial Nitrite Oxidation Geochimica et Cosmochimica Acta Casciotti, K. L. 2009; 73: 2061-2076
Determining the nitrogen isotopic composition of porphyrins by the denitrifier method Analytical Chemistry Higgins, M. B., Robinson, R. S., Casciotti, K. L., McIlvin, M., Pearson, A. 2009; 81: 184-192
Dual isotope analyses indicate efficient processing of atmospheric nitrate by forested watersheds in the northeastern U.S. Biogeochemistry Barnes, R. T., Raymond, P. A., Casciotti, K. L. 2008; 90: 15-27
Nitrogen Isotopes in the Ocean Encyclopedia of Ocean Sciences Sigman, D. M., Karsh, K. L., Casciotti, K. L. edited by Steele, J. H., Thorpe, S. A., Turekian, K. K. Academic Press, New York. 2008
Supersaturated N2O in a perennially ice-covered Antarctic lake: Molecular and stable isotopic evidence for a biogeochemical relict Limnology and Oceanography Priscu, J. C., Christner, B. C., Dore, J. E., Westley, M. B., Popp, B. N., Casciotti, K. L., Lyons, W. B. 2008; 53: 2438-2450
Insights into nutrient assimilation and export in naturally iron-fertilized waters of the Southern Ocean from nitrogen, carbon, and oxygen isotopes Deep Sea Research II Trull, T. W., Davies, D., Casciotti, K. L. 2008; 55: 820-840
Barium in Twilight Zone Suspended Matter as a Proxy for Particulate Organic Carbon Remineralization: Results from the North Pacific Deep Sea Research II Dehairs, F., Jacquet, S., Savoye, N., Bishop, J., van Mooy, B., Buesseler, K., Lamborg, C., Elskens, M., Boyd, P., Casciotti, K., Baeyens, W. 2008; 55: 1673-1683
Constraints on Nitrogen Cycling at the Subtropical North Pacific Station ALOHA from Isotopic Measurements of Nitrate and Particulate Nitrogen Deep Sea Research II Casciotti, K. L., Glover, D. M., Trull, T., Davies, D. 2008; 55: 1661-1672
Isotopic analyses of nitrate and nitrite from reference mixtures and application to Eastern Tropical North Pacific waters Marine Chemistry Casciotti, K. L., McIlvin, M. R. 2007; 107: 184-201
Oxygen isotopes in nitrite: analysis, calibration, and equilibration Analytical Chemistry Casciotti, K. L., Böhlke, J. K., McIlvin, M. R., Mroczkowski, S. J., Hannon, J. E. 2007; 79: 2427-2436
Revisiting Carbon Flux Through the Ocean's Twilight Zone Science Buesseler, K. O., Lamborg, C. H., Boyd, P. W., Lam, P. J., Trull, T. W., Bidigare, R. R., Bishop, J. K., Casciotti, K. L., Dehairs, F., Elskens, M., Honda, M., Karl, D. M., Siegel, D. A., Silver, M. W., Steinberg, D. K., Valdes, J., Van Mooy, B., Wilson, S. 2007; 316: 567-570
Method for the analysis of d18O in water Analytical Chemistry McIlvin, M., Casciotti, K. L. 2006; 78: 22377-2381
Denitrification in the Hypolimnion of Permanently Ice-Covered Lake Bonney, Antarctica Aquatic Microbial Ecology Ward , B., Granger, B. J., Maldonado, M. T., Casciotti, K. L., Harris, S., Wells, M. L. 2005; 38: 295-307
Phylogenetic analysis of nitric oxide reductase gene homologues from aerobic ammonia-oxidizing bacteria Federation of European Microbiological Societies (FEMS) Microbiology Ecology Casciotti, K. L., Ward, B. B. 2005; 52: 197-205
Using dual bacterial denitrification to improve d15N determinations of nitrates containing mass independent 17O Rapid Communications in Mass Spectrometry Coplen, T. B., Böhlke, J. K., Casciotti, K. L. 2004; 18: 245-250
Preparation and Analysis of Nitrogen-bearing Compounds in Water for Stable Isotope Ratio Measurement Handbook of Stable Isotope Analytical Techniques Chang, C. Y., Silva, S. R., Kendall, C., Michalski, G., Casciotti, K. l., Wankel, S. edited by deGroot, P. A. 2004: 305–354
Linking Diversity and Stable Isotope Fractionation in Ammonia-Oxidizing Bacteria Geomicrobiology Journal Casciotti, K. L., Sigman, D. M., Ward, B. B. 2003; 20: 335-353
Localization of Mn(II)-oxidizing activity and the putative multicopper oxidase, MnxG, to the exosporium of the marine Bacillus sp. strain SG-1 Archives of Microbiology Francis, C. A., Casciotti, K. L., Tebo, B. B. 2002; 178: 450-456
Measurement of the Oxygen Isotopic Composition of Nitrate in Marine and Fresh Waters Using the Denitrifier Method Analytical Chemistry Casciotti, K. L., Sigman, D. M., Hastings, M. G., Böhlke, J. K., Hilkert, A. 2002; 74: 4905-4912
A Bacterial Method for the Nitrogen Isotopic Analysis of Nitrate in Marine and Fresh Waters Analytical Chemistry Sigman, D. M., Casciotti, K. L., Andreani, M., Barford, C., Galanter, M., Böhlke, J. K. 2001; 73: 4145-4153
Dissimilatory Nitrite Reductase Genes in Autotrophic Ammonia-Oxidizing Bacteria Applied and Environmental Microbiology Casciotti, K. L., Ward, B. B. 2001; 67: 2213-2221
Initiation of the Spring Phytoplankton Increase in the Antarctic Polar Front Zone at 170º W Journal of Geophysical Research-Oceans Landry, M. R., Brown, S. L., Selph, K. E., Abbott, M. R., Letelier, R. M., Christensen, S., Bidigare, R. R., Casciotti, K. L. 2001; 106: 13903-13915
Nitrogen Isotopes in the Ocean Encyclopedia of Ocean Sciences Sigman, D. M., Casciotti, K. L., Steele, J. H., Thorpe, S. A. edited by Turekian, K. K. Academic Press, New York. 2001: 1884–1894

Filter By

Workgroup Membership

Karen Casciotti

Victoria and Roger Sant Director, Earth Systems Program, Professor of Earth System Science and Senior Fellow at the Woods Institute for the Environment

Group

Filter By

Contact Us

Support

Follow Stanford Earth

earthsci:changeleadership-faculty
earthsci:sustainleadership-faculty-advisors
earthsci:deans-office-staff
earthsci:deans-office-faculty
earthsci:eiper-faculty-regulars
earthsci:eiper-faculty-affiliated
earthsci:eiper-students-graduate-phd
earthsci:eiper-students-graduate
earthsci:eiper-staff-admin
earthsci:esys-faculty-affiliated
earthsci:esys-faculty-regulars
earthsci:esys-students-graduate
earthsci:esys-students-undergraduate
earthsci:esys-staff-admin
earthsci:esys-staff-teaching
earthsci:geophysics-faculty-regular
earthsci:geophysics-faculty-emeritus
earthsci:geophysics-faculty-affiliated
earthsci:geophysics-postdocs
earthsci:geophysics-students-graduate
earthsci:geophysics-students-undergraduate
earthsci:geophysics-staff-admin
earthsci:geophysics-staff-research
earthsci:ges-faculty-regular
earthsci:ges-faculty-emeritus
earthsci:ges-faculty-affiliated
earthsci:ges-postdocs
earthsci:ges-students-graduate
earthsci:ges-students-undergraduate
earthsci:ges-staff-admin
earthsci:ges-staff-research
earthsci:ere-faculty-regular
earthsci:ere-faculty-emeritus
earthsci:ere-faculty-affiliated
earthsci:ere-postdocs
earthsci:ere-students-graduate
earthsci:ere-students-undergraduate
earthsci:ere-staff-admin
earthsci:ere-staff-research
earthsci:eess-faculty-regular
earthsci:eess-faculty-emeritus
earthsci:eess-faculty-affiliated
earthsci:eess-postdocs
earthsci:eess-students-graduate
earthsci:eess-staff-admin
earthsci:eess-staff-research
earthsci:eess-staff-teaching

Search form

Karen Casciotti

Victoria and Roger Sant Director, Earth Systems Program, Professor of Earth System Science and Senior Fellow at the Woods Institute for the Environment

Group

Filter By

Contact Us

Support

Follow Stanford Earth