CT31A:
Controls on Trace Metal Biogeochemistry and Physicochemical Speciation in Seawater I

Session ID#: 92980

Session Description:
Trace metals function as essential micronutrients and pollutants in the ocean. Organic complexation, size partitioning, and redox changes of trace elements can be mediated by biological processes including uptake, regeneration, cell lysis, and organic ligand production. Additional processes influencing the production, degradation, and composition of organic matter also play an important role in controlling trace metal distributions, and both vary across environments (e.g. estuaries, open ocean, air-sea-sediment interfaces, hydrothermal systems). In turn, resulting changes in bioavailability and cycling of trace elements governs the function and composition of marine phytoplankton communities. Recent efforts, particularly within GEOTRACES, have expanded the database of trace metal concentrations and physicochemical speciation. This session seeks to link our understanding of biology, organic matter, and trace metal chemistry from molecular to basin-wide scales, from studies related to biologically-mediated transformations of trace elements to the wider processes controlling metal distributions, size partitioning, and fluxes. We welcome submissions highlighting how marine organisms influence the physicochemical speciation of trace elements in seawater, and how changes in trace element chemistry impact the structure and function of marine ecosystems. In addition to observational, experimental and modelling studies, we also invite contributions on the production, degradation, and characterization of metal-binding compounds and colloids.
Co-Sponsor(s):
  • CP - Coastal and Estuarine Processes
  • OB - Ocean Biology and Biogeochemistry
Index Terms:

4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: CHEMICAL]
4807 Chemical speciation and complexation [OCEANOGRAPHY: CHEMICAL]
4809 Colloids [OCEANOGRAPHY: CHEMICAL]
4875 Trace elements [OCEANOGRAPHY: CHEMICAL]
Primary Chair:  Hannah Whitby, IUEM Institut Universitaire Européen de la Mer, LEMAR, Plouzané, France
Co-chairs:  Randelle M Bundy, University of Washington, School of Oceanography, Seattle, WA, United States, Jessica N Fitzsimmons, Texas A & M University, Department of Oceanography, College Station, TX, United States and Andrea Koschinsky, Jacobs University Bremen, Department of Physics and Earth Sciences, Bremen, Germany
Primary Liaison:  Hannah Whitby, IUEM Institut Universitaire Européen de la Mer, LEMAR, Plouzané, France
Moderators:  Hannah Whitby, IUEM Institut Universitaire Européen de la Mer, LEMAR, Plouzané, France and Randelle M Bundy, University of Washington, School of Oceanography, Seattle, WA, United States
Student Paper Review Liaison:  Emily Estes, University of Delaware, Newark

Abstracts Submitted to this Session:

Iron supply from the Mid Atlantic Ridge to the North Atlantic ocean (648543)
Maeve Carroll Lohan, University of Southampton, Ocean and Earth Science, Southampton, SO14, United Kingdom, Alastair J.M. Lough, University of Southampton, Ocean and Earth Sciences, National Oceanography Centre, Southampton, United Kingdom, David Gonzalez Santana, Institut Universitaire Européen de la Mer, Université de Bretagne-Occidentale, Plouzané, France, Alessandro Tagliabue, University of Liverpool, Liverpool, United Kingdom and Joseph Resing, NOAA/PMEL, Joint Institute for the Study of the Atmosphere and the Ocean, Seattle, WA, United States
Characterizing organic ligands in hydrothermal plumes along the Mid-Atlantic Ridge (647113)
Colleen Lynn Hoffman1,2, Alastair J.M. Lough3, Maeve C Lohan3, Alessandro Tagliabue4, Joseph A Resing5,6 and Randelle M Bundy7, (1)University of Washington Seattle Campus, Oceanography, Seattle, WA, United States, (2)Joint Institute for the Study of Atmosphere and Ocean, and NOAA/PMEL, Seattle, WA, United States, (3)University of Southampton, Ocean and Earth Sciences, National Oceanography Centre, Southampton, United Kingdom, (4)University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom, (5)University of Washington Seattle Campus, Seattle, WA, United States, (6)Joint Institute for the Study of the Atmosphere and Ocean, and NOAA/PMEL, Seattle, WA, United States, (7)University of Washington, School of Oceanography, Seattle, WA, United States
Using shipboard incubations to assess the cycling of iron (Fe) and Fe-binding ligands in hydrothermal vent plumes along the mid Atlantic Ridge (648028)
Travis Mellett1, Alastair J.M. Lough2, Maeve C Lohan2, Alessandro Tagliabue3 and Kristen N Buck4, (1)University of South Florida St. Petersburg, St Petersburg, FL, United States, (2)University of Southampton, Ocean and Earth Sciences, National Oceanography Centre, Southampton, United Kingdom, (3)University of Liverpool, Liverpool, United Kingdom, (4)University of South Florida, College of Marine Science, Saint Petersburg, FL, United States
Complete characterization of the physicochemical speciation of hydrothermal dissolved iron, as revealed by iron isotopes: Southern East Pacific Rise (GEOTRACES GP16) (655144)
Janelle Steffen, Texas A&M University College Station, College Station, TX, United States, Brent A Summers, University of South Florida, College of Marine Science, St Petersburg, United States, Tim M Conway, University of South Florida, College of Marine Science, St. Petersburg, United States, Robert M Sherrell, Rutgers University, Departments of Marine and Coastal Sciences and Earth and Planetary Sciences, New Brunswick, NJ, United States and Jessica N Fitzsimmons, Texas A&M University, Oceanography, College Station, TX, United States
Redox cycling controls iron inputs to the interior of the eastern tropical Pacific from the Mexican continental margin (647836)
James W Moffett1, Kenneth McCarthy Bolster2, Prof Seth John2 and Shun-Chung Yang2, (1)University of Southern California, Los Angeles, CA, United States, (2)University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States
Differential behavior of metal sulfides in hydrothermal plumes and diffuse flows (651870)
Emily R Estes, International Ocean Discovery Program/JOIDES Resolution Science Operator, Science Operations, College Station, United States, Debora Berti, Virginia Tech NanoEarth Center, Blacksburg, VA, United States, Alyssa Findlay, Aarhus University, Aarhus C, Denmark, Michael F Hochella Jr, Virginia Tech, Blacksburg, VA, United States, Mustafa Yucel, Middle East Technical University, Institute of Marine Sciences, Mersin, Turkey and George W Luther III, University of Delaware, School of Marine Science & Policy, Lewes, DE, United States
Manganese complexation at hydrothermal vents (653548)
Veronique Oldham, University of Rhode Island, Graduate School of Oceanography, Narragansett, RI, United States, Timothy J Shaw, University of South Carolina Columbia, Chemistry and Biochemistry, Columbia, SC, United States, Aubin Thibault de Chanvalon, University of Delaware, College of Earth, Ocean, and Environment, Lewes, DE, United States, Bradley M Tebo, Oregon Health & Science University, Division of Environmental and Biomolecular Systems, Portland, OR, United States and George W Luther III, University of Delaware, School of Marine Science & Policy, Lewes, DE, United States
Determination of Ambient Dissolved Chemical Speciation via Kinetics and Pseudovoltammetry (646762)
George W Luther III, University of Delaware, School of Marine Science & Policy, Lewes, DE, United States