http://lod.bco-dmo.org/id/dataset/997130 eng; USA utf8 dataset Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact 2026-04-21 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) STING N2 Fixation Rates from the West Florida Shelf DON and Fe project 2026-04-21 publication 2026-04-21 revision BCO-DMO Linked Data URI 2026-04-21 creation http://lod.bco-dmo.org/id/dataset/997130 Phoebe Dreux Chappell University of South Florida principalInvestigator Rene Maurice Boiteau Oregon State University principalInvestigator Kristen Nicolle Buck Oregon State University principalInvestigator Timothy M. Conway University of South Florida principalInvestigator Angela N. Knapp Florida State University principalInvestigator Chris Smith United States Geological Survey principalInvestigator Joseph Tamborski Old Dominion University principalInvestigator Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. publisher Cite this dataset as: Chappell, P. D., Knapp, A. N., Buck, K. N., Boiteau, R. M., Conway, T. M., Smith, C., Tamborski, J., Confesor, K. (2026) STING N2 Fixation Rates. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-04-21 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/997130 [access date] Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2148836 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2148836 Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2149091 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2149091 Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2148989 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2148989 Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2148812 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2148812 Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2341997 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2341997 onGoing Phoebe Dreux Chappell University of South Florida USF St. Petersburg campus 140 7th Ave. South St. Petersburg FL 33701 USA dreux@usf.edu pointOfContact Rene Maurice Boiteau Oregon State University 612-625-6983 228 Smith Hall 207 Pleasant Street Se Minneapolis MN 55455 USA rboiteau@umn.edu pointOfContact Kristen Nicolle Buck Oregon State University 541-737-7401 2651 SW Orchard Avenue CEOAS Corvallis OR 97331 USA kristen.buck@oregonstate.edu pointOfContact Timothy M. Conway University of South Florida 727-258-1081 College of Marine Sciences 830 1st St SE St. Petersburg FL 33701 USA tmconway@usf.edu pointOfContact Angela N. Knapp Florida State University (979) 862-5235 797 Lamar St. Dept of Oceanography, Eller O&M Room 1204 College Station TX 77843 USA aknapp@tamu.edu pointOfContact Chris Smith United States Geological Survey 727-510-9884 600 4th St. S. St. Petersburg FL 33701 USA cgsmith@usgs.gov pointOfContact Joseph Tamborski Old Dominion University 631-790-1579 339 Oceanography & Physics Bldg Norfolk VA 23529 USA jtambors@odu.edu pointOfContact asNeeded Dataset Version: 1 Unknown otherRestrictions otherRestrictions Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use. Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes https://osprey.bco-dmo.org/project/880516 Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes <p><strong>NSF Award Abstract:</strong><br /> This project will investigate how groundwater discharge delivers important nutrients to the coastal ecosystems of the West Florida Shelf. Preliminary studies indicate that groundwater may supply both dissolved organic nitrogen (DON) and iron in this region. In coastal ecosystems like the West Florida Shelf that have very low nitrate and ammonium concentrations, DON is the main form of nitrogen available to organisms. Nitrogen cycling is strongly affected by iron availability because iron is essential for both photosynthesis and for nitrogen fixation. This study will investigate the sources and composition of DON and iron, and their influence on the coastal ecosystem. The team will sample offshore groundwater wells, river and estuarine waters, and conduct two expeditions across the West Florida Shelf in winter and summer. Investigators will participate in K-12 and outreach activities to increase awareness of the project and related science. The project will fund the work of six graduate and eight undergraduate students across five institutions, furthering NSF’s goals of education and training.</p> <p>Motivated by preliminary observations of unexplained, tightly-correlated DON and dissolved iron concentrations across the West Florida Shelf (WFS), the proposed work will quantify the flux and isotopic signatures of submarine groundwater discharge (SGD)-derived DON and iron to the WFS, and evaluate the bioavailability of this temporally-variable source using four seasonal near-shore campaigns sampling offshore groundwater wells, estuarine, and riverine endmembers and two cross-shelf cruises. The work will evaluate whether SGD stimulates nitrogen fixation on the WFS, and the potential for the stimulated nitrogen fixation to further modify the chemistry of DON and dissolved iron in the region. The cross-shelf cruises will investigate hypothesized periods of maximum SGD and Trichodesmium abundance (June), and reduced river discharge and SGD (February), thus comparing two distinct biogeochemical regimes. The concentrations and isotopic compositions of DON and dissolved iron, molecular composition of DON, and the concentration and composition of iron-binding ligands will be characterized. Nitrogen fixation rates and Trichodesmium spp. abundance and expression of iron stress genes will be measured. Fluxes of DON and iron from SGD and rivers will be quantified with radium isotope mass balances. The impacts of SGD on nitrogen fixation and DON/ligand production will be constrained with incubations of natural phytoplankton communities with submarine groundwater amendments. Two hypotheses will be tested: 1) SGD is the dominant source of bioavailable DON and dissolved iron on the WFS, and 2) SGD-alleviation of iron stress changes the dominant Trichodesmium species on the WFS, increases nitrogen fixation rates and modifies DON and iron composition. Overall, the work will establish connections between marine nitrogen and iron cycling and evaluate the potential for coastal inputs to modify water along the WFS before export to the Atlantic Ocean. This study will thus provide a framework to consider these boundary fluxes in oligotrophic coastal systems and the relative importance of rivers and SGD as sources of nitrogen and iron in other analogous locations, such as coastal systems in Australia, India, and Africa, where nitrogen fixation and SGD have also been documented.</p> <p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p> West Florida Shelf DON and Fe largerWorkCitation project eng; USA oceans 2026-04-21 Gulf of Mexico/America, West Florida Shelf 0 BCO-DMO catalogue of parameters from STING N2 Fixation Rates from the West Florida Shelf DON and Fe project Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact https://osprey.bco-dmo.org/dataset/997130/data/download download onLine asNeeded 7.x-1.1 Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact