Publications

  • Santoro, A.E.,Buchwald, C., Knapp, A.N., Berelson, W.M., Capone, D.G., and K. L. Casciotti. Nitrification and nitrous oxide production in the offshore waters of the Eastern Tropical South Pacific. 2020.

  • Babbin, A. R.,Buchwald, C., Morel, F.M.M., Wankel, S.D., and B .B. Ward. Nitrite oxidation exceeds reduction and fixed nitrogen loss in anoxic Pacific waters.Mar. Chem.224: 103814. 2020.

  • Howarth, L.M., Filgueira, R., Jiang, D., Koepke, H., Frame, M.K.,Buchwald, C., Finnis, S., Chopin, T., Costanzo, S.D. and J. Grant. Using macroalgal bioindicators to map nutrient plumes from fish farms and other sources at a bay-wide scale.Aquaculture Environ. Interactions.11: 671-684. 2019.

  • Buchwald, C., Homola, K., Spivack, A.J., Estes, E.R., Murray, R.W., and S.D. Wankel. Isotopic constraints on nitrogen transformation rates in the deep sedimentary marine biosphere.Global Biogeochemical Cycles.32: 1688-1702.2018.

  • Fuchsman, C.A., Devol, A.H., Casciotti, K.L, Buchwald, C., Chang, B.X., and R.E.A. Horak. An N isotopic mass balance of the Eastern Tropical North Pacific oxygen deficient zone.Deep Sea Research Part II: Topical Studies inOceanography.156: 137-147. 2018

  • Buchwald, C., Grabb, K., Hansel, C.M., and S. D. Wankel. Constraining the role of iron in environmental nitrogen transformations: Dual stable isotope systematics of abiotic NO2 reduction by Fe (II) and its production of N2O. Geochim. Cosmochim. Acta. 186: 1-12. 2016.

  • Grabb, K.C.,  Buchwald, C., Hansel, C.M., and S. D. Wankel. A dual nitrite isotopic investigation of chemodentrication by mineral-associated Fe(II) and its production of nitrous oxide. Geochim. Cosmochim. Acta. 196: 388-402. 2016.

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  • Buchwald, C., Santoro, A.E., Stanley, R., and K. L. Casciotti. Nitrogen cycling in the secondary nitrite maximum of the eastern tropical North Pacic o Costa Rica. Global Biogeochemical Cycles. 29: 2061-2081. 2015.

  • Wankel, S.D.,  Buchwald, C., Ziebis, W., Wenk, C. B., and M.F. Lehmann. Nitrogen cycling in the deep sedimentary biosphere: nitrate isotopes in porewaters underlying the oligotrophic North Atlantic. Biogeosciences. 24: 7483-7502. 2015.

  • Buchwald, C. and Casciotti, K. L. Isotopic ratios of nitrite as tracers of the source and age of oceanic nitrite. Nature Geosci. 6:308-313. 2013.

  • Casciotti, K.  Buchwald, C. and McIlvin, M. R. Implications of nitrate and nitrite isotope measurements for the mechanisms of nitrogen cycling in the Peru oxygen decient zone. Deep Sea Res. I. 80: 78-93. 2013.

  • Casciotti, K. L. and  Buchwald, C. Insights on the microbial nitrogen cycle from isotopic approaches to nitrication. Front. Microb. 3: 356. 2012.

  •   Buchwald, C., Santoro, A. E., McIlvin, M. R., and Casciotti, K. L. Oxygen isotopic composition of nitrate and nitrite produced by nitrifying co-cultures and natural marine assemblages. Limnol. Oceanogr. 47: 1361-1375. 2012.

  • Santoro, A. E.,  Buchwald, C., McIlvin, M. R., and Casciotti, K. L. Isotopic signature of N2O produced by marine ammonia-oxidizing archaea. Science. 333: 1282-1285. 2011.

  • Casciotti, K. L.,  Buchwald, C., Santoro, A. E. and Frame, C. Assessment of nitrogen and oxygen isotopic fractionation during nitrication and its expression in the marine environment. Methods in Enzymol. 486: 253-275. 2011.

  • Buchwald, C., and Casciotti, K. L. Oxygen isotopic fractionation and exchange during bacterial nitrite oxidation. Limnol. Oceanogr. 55: 1064-1074. 2010.

  • Casciotti, K. L., McIlvin, M. R., and  Buchwald, C. Oxygen isotopic exchange and fractionation during bacterial ammonia oxidation. Limnol. Oceanogr. 55: 753-762. 2010.

  • Buchwald, C. Tracking nitrogen's elusive trail in the ocean. Oceanus. 2008.