CT41A:
Controls on Trace Metal Biogeochemistry and Physicochemical Speciation in Seawater III

Session ID#: 92988

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:  Emily Estes, University of Delaware, Newark and Veronique Oldham, University of Delaware, College of Earth, Ocean, and Environment, Lewes, DE, United States
Student Paper Review Liaisons:  Emily Estes, University of Delaware, Newark and Randelle M Bundy, University of Washington, School of Oceanography, Seattle, WA, United States

Abstracts Submitted to this Session:

Incorporation of hydroxamate siderophore and associated Fe into marine particles in natural seawater (646643)
Peng Lin, Chen Xu, Wei Xing, Luni Sun and Peter H Santschi, Texas A&M University at Galveston, Department of Marine Sciences, Galveston, TX, United States
Identification of a putative Zn metallochaperone (ZCRP-A) in multiple marine diatoms and characterization in Phaeodactylum tricornutum (656446)
Marissa Morgan Kellogg1, Mak A Saito2, Mark Moosburner3, Tyler Coale4, Andrew E Allen5, Matthew R McIlvin1 and Dawn M Moran1, (1)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (2)WHOI, Woods Hole, MA, United States, (3)J Craig Venter Insitute, San Diego, United States, (4)University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, (5)J. Craig Venter Institute, La Jolla, CA, United States
Influence of volcanic ash on growth and morphology of coccolithophore algae (651973)
Giulia Faucher, University Degli Studi di Milano, Milan, Italy, Kathrin Wuttig, Antarctic Climate & Ecosystems Cooperative Research Centre (ACE CRC), University of Tasmania, Hobart, TAS, Australia, Chiara Bettoni, University degli Studi di Milano, Milan, Italy, Elisabetta Erba, Univ of Milan, Dept. Earth Sciences, Milan, Italy, Florian Koch, Hochschule Bremerhaven, An der Karlstadt 8, 27568 Bremerhaven, Germany, Scarlett Trimborn, Alfred Wegener Institut Helmholtz Zentrum für Polar und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany, Christian Völkner, Alfred Wegener Institut Helmholtz Zentrum für Polar und Meeresforschung, Am Handelshafen 12, Germany and Linn Hoffmann, University of Otago, Department of Botany, New Zealand
The Fecal Iron Pump: Animals and Marine Particles Fe Stoichiometry (651256)
Priscilla Karine Le Mézo, Universitat Autònoma de Barcelona, Institut de Ciència i Tecnologia Ambientals (ICTA), Barcelona, Spain and Eric Galbraith, Autonomous University of Barcelona, Cerdanyola del Vallès (Bellaterra), Spain; McGill University, Earth and Planetary Science, Montreal, Canada
Trace Element Dispersal by an Antarctic Subglacial Sediment Plume (653207)
Kiefer Forsch1, Robert M Sherrell2, Lisa Hahn-Woernle3, Maria Vernet4 and Katherine Barbeau1, (1)Scripps Institution of Oceanography, Geosciences Research Division, La Jolla, CA, United States, (2)Rutgers University, Departments of Marine and Coastal Sciences and Earth and Planetary Sciences, New Brunswick, NJ, United States, (3)University of Hawaii at Manoa, Honolulu, HI, United States, (4)Scripps Institution of Oceanography, Integrative Oceanography Division, La Jolla, CA, United States
Importance of the Colloidal Pool for Trace Metal Cycling in Deep-Sea Sediments (651172)
Sophie Paul1, Katja Schmidt2 and Andrea Koschinsky1, (1)Jacobs University Bremen, Department of Physics and Earth Sciences, Bremen, Germany, (2)German Federal Institute for Geosciences and Natural Resources, Hannover, Germany