headshot
  • Professor
Google Scholar Profile
Accepting Students: YES

Biography

Professor Knapp is a Chemical Oceanographer studying marine nutrient cycling. The overarching theme of her research is identifying and quantifying the dominant sources of nutrients fueling new and export production, especially in oligotrophic marine systems, using geochemical tools. She works across a range of physical scales, from physiological studies of phytoplankton to ocean basin-scale projects to quantify fluxes of nitrogen and phosphorus to and from the ocean. She currently leads a 7-PI, NSF-funded project in the Gulf of Mexico, and serves on the US GEOTRACES Steering Committee and well as the Leadership team for a NSF-funded Research Coordination Network studying Aquatic Nitrogen Fixation.

Research Interests

  • Marine Biochemistry
  • Nitrogen Fixation
  • Dissolved organic nutrients
  • Marine nitrogen stable isotope geochemistry

Selected Publications

  • *Denotes undergraduate from Knapp lab; # denotes graduate student from Knapp lab

     

    2024               #Thomas, R.K., Fawcett, S.E., #Forrer, H.J., Robinson, C.M., and A.N. Knapp, Estimates of the isotope effect for nitrate assimilation in the Indian sector of the Southern Ocean, Journal of Geophysical Research-Oceans, 129, e2023JC020830. https://doi.org/10.1029/2023JC020830

    2024                Casciotti, K.L., Marshall, T.A., Fawcett, S.E., and A.N. Knapp, Advances in understanding the marine nitrogen cycle in the GEOTRACES era, Oceanography, 37(2), https://doi.org/10.5670/oceanog.2024.406

    2023                #Liang, Z., Letscher, R.T., and A.N. Knapp, Global patterns of surface ocean dissolved organic matter stoichiometry, Global Biogeochemical Cycles, 37, e2023GB007788, doi.org/10.1029/2023GB007788

    2023                Broek, T.A.B., M.D. McCarthy, H. L. Ianiri, J.S. Vaughn, H.E. Mason, and A.N. Knapp, A new paradigm for dissolved organic nitrogen composition, cycling, and persistence in the ocean, Proceedings of the National Academy of Sciences, 120(49), doi.org/10.1073/pnas.2305763120

    2023                #Forrer, H., Bonnet, S., #Thomas, R.K., Grosso, O., Guieu, C., and A.N. Knapp, Quantifying N2 fixation and its contribution to export production near the Tonga-Kermadec Arc using nitrogen isotope budgets, Frontiers in Marine Science, 10, doi.org/10.3389/fmars/.2023.1249115

    2023                Shao, Z., Xu, Y., Wang, H., Luo, W., Wang, L., Huang, Y., …Knapp, A.N., Luo, Y.-W., Version 2 of the global oceanic diazotroph database, Earth System Science Data, 15(8), 3673-3709, doi.org/10.5194/essd-15-3673-2023

    2023                *Miranda, C.; Boiteau, R.; McKenna, A.M.; and A.N. Knapp; Quantitative and qualitative comparison of marine dissolved organic nitrogen recovery using solid phase extraction; Limnology & Oceanography: Methods, doi.org/10.1002/lom3.10558

    2023                Bonnet, S., Guieu, C., Taillandier, V., Boulart, C., Bouruet-Aubertot, P., Gazeau, F., Scalabrin, C., Bressac, M., Knapp, A.N., Cuypers, Y., Gonzalez-Santana, D., #Forrer, H.J., Grisoni, J.-M., Grosso, O., Habasque, J., Jardin-Camps, M., Leblond, N., Le Moigne, F.A.C., Lebourges-Dhaussy, A., Lory, C., Nunige, S., Pulido-Villena, E., Rizzo, A., Sarthou, G., Tilliette, C., Natural iron fertilization by shallow hydrothermal sources fuels diazotroph blooms in the Ocean, Science, 380, 812-817, doi:10.1126/science.abq4654

    2022                #Liang, Z., #McCabe, K., Fawcett, S.E., #Forrer, H.J., Hashihama, F., Jeandel, C., Marconi, D., Planquette, H., Saito, M.A., Sohm, J.A., #Thomas, R.K., Letscher, R.T., and A.N. Knapp, A global ocean dissolved organic phosphorus (DOP) concentration database (DOPv2021), Scientific Data, 9, 722, doi.org/10.1038/s41597-022-01873-7

    2022                Letscher, R.T., Wang, W.-L., #Liang, Z., and Knapp, A.N., Regionally variable contribution of dissolved organic phosphorus to marine annual net community production, Global Biogeochem. Cycles, 36, e2022GB007354. https://doi.org/10.1029/2022GB007354

    2022            #Liang, Z., Letscher, R.T., and A.N. Knapp; Phosphate and iron stress control global surface ocean dissolved organic       phosphorus concentrations; Nature Geosciences, 15(8), 651-657, doi:10.1038/s41561-022-00988-1
Google Scholar Profile