HR job title
- Professor
- Contact Info
- (979) 862-5235
- Websites
- ORCiD
- 0000-0001-5575-3382
Knapp, Angela Professor
Positions
- Professor, Oceanography, College of Arts and Sciences
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 Areas
- Overview
- Publications
- Teaching
- Background
- Contact
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Overview
Publications
selected publications
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academic article
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White, A. E., Granger, J., Selden, C., Gradoville, M. R., Potts, L., Bourbonnais, A., ... Chang, B. X.
A critical review of the 15N2 tracer method to measure diazotrophic production in pelagic ecosystems. Limnology and Oceanography: Methods.
18(4), 129-147.
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Liang, Z., McCabe, K., Fawcett, S. E., Forrer, H. J., Hashihama, F., Jeandel, C., ... Knapp, A. N.
A global ocean dissolved organic phosphorus concentration database (DOPv2021). Scientific data.
9(1), 772.
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Casciotti, K., University, S., Marshall, T., Fawcett, S., & Knapp, A.
Advances in Understanding the Marine Nitrogen Cycle in the GEOTRACES Era. OCEANOGRAPHY.
37(2),
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Berelson, W. M., Haskell, W. Z., Prokopenko, M., Knapp, A. N., Hammond, D. E., Rollins, N., & Capone, D. G.
Biogenic particle flux and benthic remineralization in the Eastern Tropical South Pacific. Deep-Sea Research Part I: Oceanographic Research Papers.
99, 23-34.
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Gerard, T., Lamkin, J. T., Kelly, T. B., Knapp, A. N., Laiz-Carrin, R., Malca, E., ... Landry, M. R.
Bluefin Larvae in Oligotrophic Ocean Foodwebs, investigations of nutrients to zooplankton: overview of the BLOOFINZ-Gulf of Mexico program. JOURNAL OF PLANKTON RESEARCH.
44(5), 600-617.
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Knapp, A. N., Thomas, R. K., Stukel, M. R., Kelly, T. B., Landry, M. R., Selph, K. E., ... Lamkin, J.
Constraining the sources of nitrogen fueling export production in the Gulf of Mexico using nitrogen isotope budgets. JOURNAL OF PLANKTON RESEARCH.
44(5), 692-710.
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Confesor, K. A., Selden, C. R., Powell, K. E., Donahue, L. A., Mellett, T., Caprara, S., ... Chappell, P. D.
Defining the Realized Niche of the Two Major Clades of Trichodesmium: A Study on the West Florida Shelf. Frontiers in Marine Science.
9, 821655.
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Knapp, A. N., Casciotti, K. L., & Prokopenko, M. G.
Dissolved Organic Nitrogen Production and Consumption in Eastern Tropical South Pacific Surface Waters. Global Biogeochemical Cycles.
32(5), 769-783.
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Letscher, R. T., Hansell, D. A., Carlson, C. A., Lumpkin, R., & Knapp, A. N.
Dissolved organic nitrogen in the global surface ocean: Distribution and fate. Global Biogeochemical Cycles.
27(1), 141-153.
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Liang, Z., Letscher, R. T., & Knapp, A. N.
Dissolved organic phosphorus concentrations in the surface ocean controlled by both phosphate and iron stress. Nature Geoscience.
15(8), 651-657.
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Sigman, D. M., Robinson, R., Knapp, A. N., van Geen, A., McCorkle, D. C., Brandes, J. A., & Thunell, R. C.
Distinguishing between water column and sedimentary denitrification in the Santa Barbara Basin using the stable isotopes of nitrate. Geochemistry, Geophysics, Geosystems.
4(5), n/a-n/a.
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Knapp, A. N., McCabe, K. M., Grosso, O., Leblond, N., Moutin, T., & Bonnet, S.
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets. Biogeosciences.
15(9), 2619-2628.
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Broek, T., McCarthy, M. D., Ianiri, H. L., Vaughn, J. S., Mason, H. E., & Knapp, A. N.
Dominant heterocyclic composition of dissolved organic nitrogen in the ocean: A new paradigm for cycling and persistence. Proceedings of the National Academy of Sciences of the United States of America.
120(49), e2305763120.
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Thomas, R. K., Fawcett, S. E., Forrer, H. J., Robinson, C. M., & Knapp, A. N.
Estimates of the Isotope Effect for Nitrate Assimilation in the Indian Sector of the Southern Ocean. Journal of Geophysical Research (JGR): Oceans.
129(7),
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Haskell, W. Z., Prokopenko, M. G., Stanley, R., & Knapp, A. N.
Estimates of vertical turbulent mixing used to determine a vertical gradient in net and gross oxygen production in the oligotrophic South Pacific Gyre. Geophysical Research Letters.
43(14), 7590-7599.
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Liang, Z., Letscher, R. T., & Knapp, A. N.
Global Patterns of Surface Ocean Dissolved Organic Matter Stoichiometry. Global Biogeochemical Cycles.
37(12),
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Shao, Z., Xu, Y., Wang, H., Luo, W., Wang, L., Huang, Y., ... Luo, Y.
Global oceanic diazotroph database version 2 and elevated estimate of globaloceanic N2 fixation. Earth System Science Data.
15(8), 3673-3709.
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Knapp, A. N., Sigman, D. M., Lipschultz, F., Kustka, A. B., & Capone, D. G.
Interbasin isotopic correspondence between upperocean bulk DON and subsurface nitrate and its implications for marine nitrogen cycling. Global Biogeochemical Cycles.
25(4), n/a-n/a.
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Wilson, S. T., Hawco, N. J., Armbrust, E. V., Barone, B., Bjrkman, K. M., Boysen, A. K., ... Karl, D. M.
Klauea lava fuels phytoplankton bloom in the North Pacific Ocean. Science.
365(6457), 1040-1044.
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Kelly, T. B., Knapp, A. N., Landry, M. R., Selph, K. E., Shropshire, T. A., Thomas, R. K., & Stukel, M. R.
Lateral advection supports nitrogen export in the oligotrophic open-ocean Gulf of Mexico. Nature Communications.
12(1), 3325.
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Knapp, A. N., Casciotti, K. L., Berelson, W. M., Prokopenko, M. G., & Capone, D. G.
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.
113(16), 4398-4403.
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Letscher, R. T., Knapp, A. N., James, A. K., Carlson, C. A., Santoro, A. E., & Hansell, D. A.
Microbial community composition and nitrogen availability influence DOC remineralization in the South Pacific Gyre. Marine Chemistry.
177, 325-334.
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Knapp, A. N., Sigman, D. M., & Lipschultz, F.
N isotopic composition of dissolved organic nitrogen and nitrate at the Bermuda Atlantic Timeseries Study site. Global Biogeochemical Cycles.
19(1),
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Bonnet, S., Guieu, C., Taillandier, V., Boulart, C., Bouruet-Aubertot, P., Gazeau, F., ... Tilliette, C.
Natural iron fertilization by shallow hydrothermal sources fuels diazotroph blooms in the ocean. Science.
380(6647), 812-817.
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SPENCER, P. K., & KNAPP, A. N.
New stratigraphic markers in the late Pleistocene Palouse loess: novel fossil gastropods, absolute age constraints and nonaeolian facies. Sedimentology.
57(1), 41-52.
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Knapp, A. N., DiFiore, P. J., Deutsch, C., Sigman, D. M., & Lipschultz, F.
Nitrate isotopic composition between Bermuda and Puerto Rico: Implications for N2 fixation in the Atlantic Ocean. Global Biogeochemical Cycles.
22(3),
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Santoro, A. E., Buchwald, C., Knapp, A. N., Berelson, W. M., Capone, D. G., & Casciotti, K. L.
Nitrification and Nitrous Oxide Production in the Offshore Waters of the Eastern Tropical South Pacific. Global Biogeochemical Cycles.
35(2),
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Knapp, A. N., Fawcett, S. E., Martnez-Garcia, A., Leblond, N., Moutin, T., & Bonnet, S.
Nitrogen isotopic evidence for a shift from nitrate- to diazotroph-fueled export production in the VAHINE mesocosm experiments. Biogeosciences.
13(16), 4645-4657.
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Capone, D. G., & Knapp, A. N.
Oceanography: a marine nitrogen cycle fix?. Nature.
445(7124), 159-160.
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Collins, L. E., Berelson, W., Hammond, D. E., Knapp, A., Schwartz, R., & Capone, D.
Particle fluxes in San Pedro Basin, California: A four-year record of sedimentation and physical forcing. Deep-Sea Research Part I: Oceanographic Research Papers.
58(8), 898-914.
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Selph, K. E., Swalethorp, R., Stukel, M. R., Kelly, T. B., Knapp, A. N., Fleming, K., Hernandez, T., & Landry, M. R.
Phytoplankton community composition and biomass in the oligotrophic Gulf of Mexico. JOURNAL OF PLANKTON RESEARCH.
44(5), 618-637.
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Johnston, D. T., Gill, B. C., Masterson, A., Beirne, E., Casciotti, K. L., Knapp, A. N., & Berelson, W.
Placing an upper limit on cryptic marine sulphur cycling. Nature.
513(7519), 530-533.
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Stukel, M. R., Gerard, T., Kelly, T. B., Knapp, A. N., Laiz-Carrin, R., Lamkin, J. T., ... Swalethorp, R.
Plankton food webs in the oligotrophic Gulf of Mexico spawning grounds of Atlantic bluefin tuna. JOURNAL OF PLANKTON RESEARCH.
44(5), 763-781.
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Forrer, H. J., Bonnet, S., Thomas, R. K., Grosso, O., Guieu, C., & Knapp, A. N.
Quantifying N2 fixation and its contribution to export production near the Tonga-Kermadec Arc using nitrogen isotope budgets. Frontiers in Marine Science.
10, 1249115.
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Miranda, C., Boiteau, R. M., McKenna, A. M., & Knapp, A. N.
Quantitative and qualitative comparison of marine dissolved organic nitrogen recovery using solid phase extraction. Limnology and Oceanography: Methods.
21(8), 467-477.
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Letscher, R. T., Wang, W., Liang, Z., & Knapp, A. N.
Regionally Variable Contribution of Dissolved Organic Phosphorus to Marine Annual Net Community Production. Global Biogeochemical Cycles.
36(12),
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Pinckney, J. L., Zaunbrecher, S., Lang, S., Wilson, A., & Knapp, A.
Seasonality of benthic microalgal community abundance in shallow shelf waters. Continental Shelf Research.
244, 104797-104797.
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Knapp, A. N., Dekaezemacker, J., Bonnet, S., Sohm, J. A., & Capone, D. G.
Sensitivity of Trichodesmium erythraeum and Crocosphaera watsonii abundance and N2 fixation rates to varying NO3 and PO43 concentrations in batch cultures. AQUATIC MICROBIAL ECOLOGY.
66(3), 223-236.
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Yingling, N., Kelly, T. B., Shropshire, T. A., Landry, M. R., Selph, K. E., Knapp, A. N., Kranz, S. A., & Stukel, M. R.
Taxon-specific phytoplankton growth, nutrient utilization and light limitation in the oligotrophic Gulf of Mexico. JOURNAL OF PLANKTON RESEARCH.
44(5), 656-676.
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Howe, S., Miranda, C., Hayes, C. T., Letscher, R. T., & Knapp, A. N.
The Dual Isotopic Composition of Nitrate in the Gulf of Mexico and Florida Straits. Journal of Geophysical Research (JGR): Oceans.
125(9),
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Knapp, A. N., Sigman, D. M., Kustka, A. B., Saudo-Wilhelmy, S. A., & Capone, D. G.
The distinct nitrogen isotopic compositions of low and high molecular weight marine DON. Marine Chemistry.
136, 24-33.
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Sigman, D. M., DiFiore, P. J., Hain, M. P., Deutsch, C., Wang, Y. i., Karl, D. M., ... Pantoja, S.
The dual isotopes of deep nitrate as a constraint on the cycle and budget of oceanic fixed nitrogen. Deep-Sea Research Part I: Oceanographic Research Papers.
56(9), 1419-1439.
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Knapp, A. N., Hastings, M. G., Sigman, D. M., Lipschultz, F., & Galloway, J. N.
The flux and isotopic composition of reduced and total nitrogen in Bermuda rain. Marine Chemistry.
120(1-4), 83-89.
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Welch, A. W., Knapp, A. N., Tourky, S. E., Daughtery, Z., Hitchcock, G., & Benetti, D.
The nutrient footprint of a submergedcage offshore aquaculture facility located in the tropical Caribbean. Journal of the World Aquaculture Society.
50(2), 299-316.
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Knapp, A. N.
The sensitivity of marine N(2) fixation to dissolved inorganic nitrogen. Frontiers in Microbiology.
3, 374.
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Jacquot, J. E., Kondo, Y., Knapp, A. N., & Moffett, J. W.
The speciation of copper across active gradients in nitrogencycle processes in the eastern tropical South Pacific. LIMNOLOGY AND OCEANOGRAPHY.
58(4), 1387-1394.
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Marconi, D., Sigman, D. M., Casciotti, K. L., Campbell, E. C., Weigand, M. A., Fawcett, S. E., ... Haug, G. H.
Tropical Dominance of N2 Fixation in the North Atlantic Ocean. Global Biogeochemical Cycles.
31(10), 1608-1623.
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Haskell, W. Z., Kadko, D., Hammond, D. E., Knapp, A. N., Prokopenko, M. G., Berelson, W. M., & Capone, D. G.
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.
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White, A. E., Granger, J., Selden, C., Gradoville, M. R., Potts, L., Bourbonnais, A., ... Chang, B. X.
A critical review of the 15N2 tracer method to measure diazotrophic production in pelagic ecosystems. Limnology and Oceanography: Methods.
18(4), 129-147.
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conference paper
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Wilson, S., Hawco, N., Barone, B., Boysen, A., DeLong, E., Dugenne, M., ... Karl, D.
The Oceans Response to the 2018 Klauea Volcano Eruption. 2877-2877.
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Wilson, S., Hawco, N., Barone, B., Boysen, A., DeLong, E., Dugenne, M., ... Karl, D.
The Oceans Response to the 2018 Klauea Volcano Eruption. 2877-2877.
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institutional repository document
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Knapp, A. N., McCabe, K. M., Grosso, O., Leblond, N., Moutin, T., & Bonnet, S.
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets
-
Liang, Z., Letscher, R. T., & Knapp, A. N.
Global patterns of surface ocean dissolved organic matter stoichiometry
-
Kelly, T., Knapp, A., Landry, M., Selph, K., Shropshire, T., Thomas, R., & Stukel, M.
Lateral Advection Supports Nitrogen Export in the Oligotrophic Open-Ocean Gulf of Mexico
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Santoro, A. E., Buchwald, C., Knapp, A. N., Berelson, W. M., Capone, D. G., & Casciotti, K. L.
Nitrification and nitrous oxide production in the offshore waters of the Eastern Tropical South Pacific
-
Knapp, A. N., Fawcett, S. E., Martnez-Garcia, A., Leblond, N., Moutin, T., & Bonnet, S.
Nitrogen isotopic evidence for a shift from nitrate- to diazotroph-fueled export production in VAHINE mesocosm experiments
-
Liang, Z., Letscher, R., & Knapp, A.
Phosphate and iron stress control global surface ocean dissolved organic phosphorus concentrations
-
Stukel, M. R., Gerard, T., Kelly, T., Knapp, A. N., Laiz-Carrin, R., Lamkin, J., ... Swalethorp, R.
Plankton food webs of the Gulf of Mexico spawning grounds of Atlantic Bluefin tuna
-
Letscher, R. T., Wang, W., Liang, Z., & Knapp, A. N.
Regionally variable contribution of dissolved organic phosphorus to marine annual net community production
-
Yingling, N., Kelly, T. B., Shropshire, T. A., Landry, M. R., Selph, K. E., Knapp, A. N., Kranz, S. A., & Stukel, M. R.
Taxon-specific phytoplankton growth, nutrient utilization, and light limitation in the oligotrophic Gulf of Mexico
-
Knapp, A. N., McCabe, K. M., Grosso, O., Leblond, N., Moutin, T., & Bonnet, S.
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets
Teaching
teaching activities
- OCNG340 Chemical Oceanography Instructor
- OCNG603 Communicating Ocean Science Instructor
Background
education and training
- Ph.D. in Geosciences, Princeton University - (Princeton, New Jersey, United States) 2006
- B.A. in Biology-Geology, Whitman College - (Walla Walla, Washington, United States) 1999
- University of Southern California - (Los Angeles, California, United States) , Postdoctoral Training 2008
Contact
first name
- Angela
has last name
- Knapp
mailing address
-
797 Lamar St., Eller O&M Room 1204
3146 TAMU
Oceanography Dept., TAMU
College Station, TX 77843
USA
Other
- aknapp@tamu.edu