Publications
Google Scholar Profile
ORCiD profile
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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, 2024, Journal of Geophysical Research-Oceans, 129, e2023JC020830. https://doi.org/10.1029/2023JC020830
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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),
doi.org/10.5670/oceanog.2024.406
- Liang, Z., Letscher, R.T., and A.N. Knapp, 2023, Global
patterns of surface ocean dissolved organic matter stoichiometry,
Global Biogeochemical Cycles, 37, e2023GB007788, doi.org/10.1029/2023GB007788
- Broek, T.A.B., M.D. McCarthy, H. L. Ianiri, J.S. Vaughn,
H.E. Mason, and A.N. Knapp, 2023, 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
- Forrer, H.J., Bonnet, S., Thomas, R.K., Grosso, O., Guieu,
C., and A.N. Knapp, 2023, Quantifying N2 fixation and its contribution to export production near
the Tonga-Kermadec Arc using nitrogen isotope budgets, 2023, Frontiers in
Marine Science, 10:1249115, doi:10.3389/fmars.2023.1249115
- Shao, Z., Xu, Y., Wang, H., Luo, W., Wang, L., Huang,
Y., Agawin, N.S.R., Ahmed, A., Benavides, M., Bentzon-Tilia, M.,
Berman-Frank, I., Berthelot, H., Biegala, I.C., Bif, M.B., Bode,
A., Bonnet, S., Bronk, D.A., Brown, M.V., Campbell, L., Capone,
D.G., Carpenter, E.J., Cassar, N., Chang, B.X., Chappell, D.,
Chen, Y.L., Church, M.J., Cornejo-Castilo, F.M., Detoni, A.M.S.,
Doney, S.C., Dupuoy, C., Estrada, M., Fernandez, C.,
Fernandez-Castro, B., Fonseca-Batista, D., Foster, R.A., Furuya,
K., Garcia, N., Goto, K., Gago, J., Gradoville, M.R., Hamersley,
M.R., Henke, B.A., Horstmann, C., Jayakumar, A., Jiang, Z., Kao,
S.-J., Karl, D., Kittu, L.R., Knapp, A.N., Kumar, S., LaRoche, J.,
Liu, H., Liu, J., Lory, C., Loscher, C.R., Maranon, E., Messer,
L.F., Mills, M.M., Mohr, W., Moisander, P.H., Mahaffey, C., Moore,
R., Mourino-Carballilo, B., Mulholland, M.R., Nakaoka, S.-I.,
Needoba, J.A., Raes, E.J., Rahav, E., Ramirez-Cardenas, T.,
Reeder, C.F., Riemann, L., Fiou, V., Robidart, J.C., Sarma,
V.V.S.S., Sato, T., Saxena, H., Selden, C., Seymour, J.R., Shi,
D., Shiozaki, T., Singh, A., Sipler, R.E., Sun, J., Suzuki, K.,
Takahashi, K., Tan, Y., Tang, W., Tremblay, J.-E., Turk-Kubo, K.,
Wen, Z., White, A.E., Wilson, S.T., Yoshida, T., Zehr, J.P.,
Zhang, R., Luo, Y.-W., 2023, Version 2 of the global oceanic
diazotroph database, Earth System Science Data, 15,
3673-3709, doi.org/10.5194/essd-15-3673-2023
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Miranda, C., Boiteau, R., McKenna, A.M., and A.N. Knapp, 2023,
Quantitative and qualitative comparison of marine dissolved
organic nitrogen recovery using solid phase extraction, Limnology
and Oceanography: Methods, doi.org/10.1002/lom3.10558
- 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., 2023, Natural iron fertilization by shallow hydrothermal sources fuels
diazotroph blooms in the Ocean, Science, 380, 812-817,
doi.org/10.1126/science.abq4654
- Liang, Z., McCabe, K., Fawcett, S., Forrer, H., Hashihama,
F., Jeandel, C., Marconi, D., Planquette, H., Saito, M., Sohm, J.,
Thomas, R., Letscher, R., and Knapp, A.N., 2022, A global ocean
dissolved organic phosphorus (DOP) concentration database
(DOPv2021), Scientific Data, 9, 722, doi.org/10.1038/s41597-022-01873-7
- Letscher, R.T., Wang, W.-L., Liang, Z., and Knapp, A.N., 2022, Regionally variable contribution of dissolved organic
phosphorus to marine annual net community production, Global
Biogeochemical Cycles, 36, e2022GB007354, doi.org/10.1029/2022GB007354
- Liang, Z., Letscher, R.T., and Knapp, A.N., Phosphate and iron stress control
global surface ocean dissolved organic phosphorus concentrations, 2022,
Nature Geoscience, 15, 651-657, doi:10.1038/s41561-022-00988-1
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Gerard, T., Lamkin, J.T., Kelly, T.B., Knapp, A.N., Laiz-Carrion, L., Malca, E., Selph, K.E., Shiroza, A., Shropshire, T.A., Stukel,
M.R., Swalethorp, R., Yingling, N., & Landry, M.R.; Bluefin Larvae
in Oligotrophic Ocean Foodwebs, Investigations of Nutrients to
Zooplankton: Overview of the BLOOFINZ-Gulf of Mexico program,
2022, Journal of Plankton Research, fbac038, doi.org/10.1093/plankt/fbac038
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Pinckney, J.L., Zaunbrecher, S., Lang, S., Wilson, A., and A.N. Knapp,
Seasonality of benthic macroalgal community abundance in shallow
shelf waters, 2022, Continental Shelf Research, 244, 104797, doi.org/10.1016/j.csr.2022.104797
- Confesor, K., Selden, C., Powell, K., Donahue, L., Mellett, T.,
Caprara, S., Knapp, A.N., Buck, K.N, and Chappell, P.D., 2022,
Defining the realized niche of the two major clades of
Trichodesmium: a study on the West Florida Shelf, Frontiers in
Marine Science, 9:821655, doi:10.3389/fmars.2022.821655
- Knapp, A.N., Thomas, R.K., Stukel, M.R., Kelly, T.B., Landry,
M.R., Selph, K.E., Malca, E., Gerard, T., and Lamkin, J., 2021,
Constraining the sources of nitrogen fueling export production in
the Gulf of Mexico using nitrogen isotope budgets, Journal of
Plankton Research, fbab049, 1-19, doi.org/10.1093/plankt/fbab049
- Kelly, T.B., Knapp, A.N., Landry, M.R., Selph, K.E.,
Shropshire, T., Thomas, R.K., and Stukel, M.R., 2021, Lateral
Advection Supports Nitrogen Export in the Oligotrophic Open-Ocean
Gulf of Mexico, Nature Communications, 12, 3325, doi.org/10.1038/s41467-021-23678-9
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Yingling, N., Kelly, T.B., Shropshire, T.A., Landry, M.R., Selph,
K.E., Knapp, A.N., Kranz, S.A., and Stukel, M.R., 2021, Taxon-specific
phytoplankton growth, nutrient utilization and light limitation in
the oligotrophic Gulf of Mexico, Journal of Plankton Research,
fbab028, doi:10.1093/plankt/fbab028
- Stukel,
M.R., Gerard, T., Kelly, T.B., Knapp, A.N., Laiz-Carrion, R.,
Lamkin, J.T., Landry, M.R., Malca, E., Selph, K.E., Shiroza, A.,
Shropshire, T.A., and Swalethorp, R., 2021, Plankton food webs in the
oligotrophic Gulf of Mexico spawning grounds of Atlantic bluefin
tuna, Journal of Plankton Research, fbab023, doi:10.1093/plankt/fbab023
- Selph, K., Swalethorp, R., Stukel, M., Kelly, T., Knapp, A.N., Fleming, K., Hernandez, T., and M. Landry, 2021, Phytoplankton
community composition and biomass in the open-ocean Gulf of Mexico,
J. Plankton Research, fbab006, doi:10.1093/plankt/fbab006
- Santoro, A.E., Buchwald, C., Knapp, A.N., Berelson, W.M.,
Capone, D.G., and Casciotti, K.L., 2021,
Nitrification and nitrous oxide production in the offshore waters of
the Eastern Tropical South Pacific, Global Biogeochemical Cycles,
35,
e2020GB006716, https://doi.org/10.1029/2020GB006716
- Howe, S., C. Miranda, C. Hayes, R. Letscher, and A.N. Knapp,
2020, The dual isotopic composition of nitrate in the Gulf of Meixco
and Florida Straits, 125, e2020JC016047, Journal of Geophysical Research-Oceans, doi:10.1029/2020JC016047
- White, A.E., J. Granger, C. Selden, M.R. Gradoville, L. Potts,
A. Bourbonnais, R.W. Fulweiler, A.N. Knapp, W. Mohr, C.R. Tobias,
S.T. Wilson, M. Benavides, S. Bonnet, M. Mulholland, and B.X. Chang, 2020,
A review of the 15N2 tracer method to measure diazotrophic
production in pelagic ecosystems,Limnology and
Oceanography: Methods, 18, 129-147, doi: 10.1002/lom3.10353
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Redalje, D., J. Ammerman, J. Herrera, A.N. Knapp, D. Valdes, and
A. Hayward, 2019, Nutrients in the Gulf of Mexico:
Distributions, Cycles, Sources, Sinks, and Processes. In: Gulf of
Mexico Origin, Waters, and Biota: Volume 5:
Chemical Oceanography, Thomas Bianchi,
Editor. Texas A&M Press.
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Wilson, S. T., Hawco, N. J., Armbrust, E. V., Barone, B., Bjorkman,
K. M., Boysen, A. K., Burgos, M., Burrell, T. J., Casey, J. R.,
DeLong, E. F., Dugenne, M., Dutkiewicz, S., Dyhrman, S. T., Ferron,
S., Follows, M. J., Foreman, R. K., Funkey, C. P., Harke, M. J.,
Henke, B. A., Hill, C. N., Hynes, A. M., Ingalls, A. E., Jahn, O.,
Kelly, R. L., Knapp, A. N., Letelier, R. M., Ribalet, F.,
Shimabukuro, E. M., Tabata, R. K. S., Turk-Kubo, K. A., White,
A. E., Zehr, J. P., John, S., & Karl, D. M. (2019). Kilauea lava
fuels phytoplankton bloom in the North Pacific Ocean. Science, 365,
1040-1044
See associated "Perspective"
by Ducklow and Plank
- Welch, A.W., A.N. Knapp, S. El-Tourky, Z. Daughtery, G. Hitchcock,
and D. Benetti, 2019, The nutrient footprint of a submerged cage
offshore aquaculture facility located in the tropical Caribbean,
Journal of the World Aquaculture Society, 50(2) 1-18, doi:10.1111/jwas.12593
- Knapp, A.N., K.L. Casciotti, and M.G. Prokopenko, Dissolved
organic nitrogen production and consumption in eastern tropical
South Pacific surface waters, 2018, Global Biogeochemial Cycles, 32,
doi:10.1029/2017GB005875
- Knapp, A.N., K.M. McCabe, O. Grosso, N. Leblond, T. Moutin, and
S. Bonnet, Distribution and rates of nitrogen fixation in the
western tropical South Pacific Ocean constrained by nitrogen isotope
budgets, 2018, Biogeosciences, 15, 2619-2628, doi:10.5194/bg-2619-2018
- Marconi, D., D. Sigman, K. Casciotti, E. Campbell, M. Weigand,
S. Fawcett, A. Knapp, P. Rafter, B. Ward, and G. Haug, Tropical
dominance of N2 fixation in the North Atlantic Ocean, 2017,
Global Biogeochemical Cycles, 31, doi:10.1002/2016GB005613
- Fassbender, A.J., H.I. Palevsky, T.R. Martz, A.E. Ingalls, M. Gledhill, S.E. Fawcett, J. Brandes, L. Aluwihare, and the
participants of COME ABOARD, DISCO XXV, Perspectives on Chemical
Oceanography in the 21st century: Participants of the COME ABOARD
Meeting examine aspects of the field in the context of 40 years of
DISCO, 2017, Marine Chemistry, 196, 181-190, doi:10.1016/j.marchem.2017.09.002
- Knapp, A.N., S.E. Fawcett, A. Martinez-Garcia, N. Leblond,
T. Moutin, and S. Bonnet, Nitrogen isotopic evidence for a shift
from nitrate- to diazotroph-fueled export production in the VAHINE
mesocosm experiments, 2016, Biogeosciences, 13, 4645-4657,
doi:10.5194/bg-13-4645-2016
- Haskell, W.Z., M.G. Prokopenko, R.H.R. Stanley, and A.N. Knapp,
Estimates of vertical turbulent mixing used to determine a vertical
gradient in net and gross oxygen production in the oligotrophic
South Pacific Gyre, 2016, Geophysical Research Letters, 43, doi:10.1002/2016GL069523
- Knapp, A.N., K.L. Casciotti, W.M. Berelson, M.G. Prokopenko, and
D.G. Capone, Low rates of nitrogen fixation in the eastern tropical
South Pacific surface waters, 2016, Proceedings of the National
Academy of Sciences, 113, 4398-4403, doi:10.1073/pnas.1515641113
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Letscher, R.T., A.N. Knapp, A.K. James, C.A. Carlson, A.E. Santoro,
and D.A. Hansell, 2015, Microbial community composition and nitrogen
availability influence DOC remineralization in the South Pacific
Gyre, Marine Chemistry, 177, 325-334, doi:10.1016/j.marchem.2015.06.024
- Berelson, W.M., W. Haskell, M.G. Prokopenko, A.N. Knapp,
D. Hammond, N. Rollins, D.G. Capone, 2015, Biogenic rain and
benthic remineralization in the Eastern Tropical South Pacific,
Deep-Sea Research I, 99, 23-34, doi:10.1016/j.dsr.2014.12.006.
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Haskell, W.Z., D. Kadko, D.E. Hammond, A.N. Knapp, M.G. Prokopenko,
W.M. Berelson, and D.G. Capone, 2015, Upwelling velocity and
eddy diffusivity from 7Be measurements used to compare vertical
nutrient flux to export POC flux in the Eastern Tropical South
Pacific, Marine Chemistry, 168, 140-150, doi: 10.1016/j.marchem.2014.10.004
- Johnston, D.T., B.C. Gill, A. Masterson,
E. Beirne, K.L. Casciotti, A.N. Knapp, and W. Berelson, 2014,
Placing an upper limit on cryptic sulphur cycling, Nature, 513, 530-533,
doi:10.1038/nature13698
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Jacquot, J.E., Y. Kondo, A.N. Knapp, and J.W. Moffett, 2013, The speciation of
copper across active gradients in nitrogen-cycle processes in the eastern tropical
South Pacific, Limnology & Oceanography, 58, 1387-1394
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Letscher, R.T., D.A. Hansell, C.A. Carlson, R. Lumpkin, and
A.N. Knapp, 2013,
*Dissolved organic nitrogen in the global surface ocean: Distribution and fate,
Global Biogeochem. Cycles, 27, doi/10.1029/2012GB004449/
*See associated
Nature "News and Views" article by Voss and Heitanen
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Knapp, A.N., 2012, The sensitivity of marine N2 fixation
to dissolved inorganic nitrogen, Frontiers in Microbiology, 3:374. doi: 10.3389/fmicb.2012.00374
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Knapp, A.N., J. Dekaezemacker, S. Bonnet, J.A. Sohm,
and D.G. Capone, 2012, Sensitivity of Trichodesmium and
Crocosphaera abundance and N2 fixation rates to varying NO3-
and PO43- concentrations in batch cultures, Aquatic
Microbial Ecology, 66, 223-236, doi:10.3354/ame01577
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Knapp, A.N., D.M. Sigman, A.B. Kustka,
S.A. Sanudo-Wilhelmy, and D.G. Capone, 2012, The distinct nitrogen isotopic compositions of low and high
molecular weight DON, Marine Chemistry, 136-137, 24-33, doi:10.1016/j.marchem.2012.05.001
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Knapp, A.N., D.M. Sigman, F. Lipschultz, A.B. Kustka, and
D.G. Capone, 2011, Interbasin isotopic correspondence
between upper-ocean bulk DON and subsurface nitrate and its
implications for marine nitrogen cycling, Global
Biogeochemical Cycles, 25, GB4004, doi:10.1029/2010GB003878
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Collins, L.E., W. Berelson, D.E. Hammond, A. Knapp, R. Schwartz, and
D. Capone, 2011, Particle fluxes in San Pedro Basin,
California: A four-year record of sedimentation and physical
forcing, Deep-Sea Research I, 58, 898-914.
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Knapp, A.N., M.G. Hastings, D.M. Sigman, F. Lipschultz and
J.N. Galloway, 2010, The flux and isotopic composition of
reduced and total nitrogen in Bermuda rain, Marine
Chemistry, 120, 83-89, doi:10.1016/j.marchem.2008.08.007
(Published online in final form in 2008)
- Spencer, P.K., and A.N. Knapp, 2010, Sedimentology, New
stratigraphic markers in the late Pleistocene Palouse loess: novel fossil gastropods, absolute age constraints, and non-eolian facies, 57, 41-52,doi:10.1111/j.1365-3091.2009.01085.x
- Sigman,
D.M., P.J. DiFiore, M.P. Hain, C. Deutsch, Y. Wang, D.M. Karl,
A.N. Knapp, M.F. Lehmann, and S. Pantoja, 2009, The dual isotopes of
deep nitrate as a constraint on the cycle and budget of oceanic fixed
nitrogen. Deep-Sea Res. I, 56, 1419-1439,
doi:10.1016/j.dsr.2009.04.007
- Knapp, A.N., P.J. DiFiore, C. Deutsch, D.M. Sigman, and F. Lipschultz, 2008, Nitrate isotopic composition between Bermuda and Puerto Rico Implications for N2 fixation in the Atlantic Ocean, Global Biogeochem. Cycles, 22, GB3014.
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Capone, D.G., and A.N. Knapp, 2007, A marine nitrogen cycle fix?,
Nature, 445, 159-160
- Knapp, A.N., D.M. Sigman, and
F. Lipschultz, 2005, N isotopic composition of dissolved organic
nitrogen and nitrate at the Bermuda Atlantic Time-series Study site, Global Biogeochem. Cycles, 19, GB1018, doi:10.1029/2004GB002320
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Sigman, D.M., R. Robinson, A.N. Knapp, A. van Geen, D.C. McCorkle,
J.A. Brandes, and R.C. Thunell, 2003, Distinguishing between water
column and sedimentary denitrification in the Santa Barbara Basin
using the stable isotopes of nitrate, Geochem., Geophys., Geosyst., 4,
1040, doi:10.1029/2002GC000394, 2003.
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