CT33A:
Controls on Trace Metal Biogeochemistry and Physicochemical Speciation in Seawater II

Session ID#: 92984

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, University of Liverpool, United Kingdom
Co-chairs:  Randelle M Bundy, University of Washington Seattle Campus, School of Oceanography, Seattle, United States, Jessica N Fitzsimmons, Texas A & M University, Department of Oceanography, College Station, United States and Andrea Koschinsky, Jacobs University Bremen, Department of Physics and Earth Sciences, Bremen, Germany
Primary Liaison:  Hannah Whitby, University of Liverpool, United Kingdom
Moderators:  Emily Estes, University of Delaware, Newark and Veronique Oldham, University of Delaware, College of Earth, Ocean, and Environment, Lewes, United States
Student Paper Review Liaison:  Emily Estes, University of Delaware, Newark

Abstracts Submitted to this Session:

CT33A-01
Trace Metal Behavior and Size Fractionation Along the River Water – Seawater Mixing Gradient in the Amazon River Estuary and Plume (650839)
Andrea Koschinsky1, Leandro de Carvalho2, Martha Gledhill3, Adrienne Hollister1, Cristian H. Krause4, Alexandre B. Schneider4 and Imelda Velasquez1, (1)Jacobs University Bremen, Department of Physics and Earth Sciences, Bremen, Germany, (2)Universidade Federal de Santa Maria, Department of Chemistry, Santa Maria, Brazil, (3)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (4)Universidade Federal do Rio Grande do Sul, Department of Chemistry, Porto Alegre, Brazil
CT33A-02
Contrasting behaviours of dissolved organic- iron, aluminium and phosphorus fractions in the Amazon Estuary (649944)
Martha Gledhill, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany and Adrienne Hollister, Jacobs University Bremen, Department of Physics and Earth Sciences, Bremen, Germany
CT33A-03
Dissolved Concentrations and Organic Speciation of Cu in the Amazon River Estuary and Mixing Plume (643404)
Adrienne Hollister1, Martha Gledhill2 and Andrea Koschinsky1, (1)Jacobs University Bremen, Department of Physics and Earth Sciences, Bremen, Germany, (2)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
CT33A-04
Organic Copper Speciation in the North Pacific (651793)
Lydia Babcock-Adams1, Jingxuan LI2, Marianne Acker3, Luis Valentin-Alvarado4, Randelle M Bundy5 and Daniel Repeta3, (1)Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, United States, (2)MIT-WHOI Joint Program, Chemical Oceanography, Woods Hole, MA, United States, (3)Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry, Woods Hole, MA, United States, (4)University of California at Berkeley, United States, (5)University of Washington Seattle Campus, School of Oceanography, Seattle, United States
CT33A-05
Evidence for the Production of Copper-complexing Ligands by Marine Phytoplankton in the Canadian Arctic and Subarctic NE Pacific (638184)
Andrew Ross1, Richard Liam Nixon2, Jasper George2, Sarah Louise Jackson2 and Jay T. Cullen3, (1)Fisheries and Oceans Canada, Institute of Ocean Sciences, Sidney, BC, Canada, (2)University of Victoria, Victoria, BC, Canada, (3)University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada
CT33A-06
The Organic Ties of Iron - Organic Iron speciation related to humic substances and microbial interactions (641354)
Hans Slagter, NIOZ Royal Netherlands Institute for Sea Research, MMB, Den Burg, Netherlands, Luis M. Laglera, University of the Balearic Islands, Departamento de Química, 07122 Palma, Spain, Martha Gledhill, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, Corina P.D. Brussaard, NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry, Den Burg, Netherlands, Camila Sukekava, Federal University of Rio Grande. Av. Itália, km 8, Rio Grande, Rio grande do Sul, Brazil and Loes JA Gerringa, NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University, OCS, Den Burg, Netherlands
CT33A-07
Biogeochemical speciation of cryospheric trace metals at the seawater-surface interface of the Arctic Ocean (654864)
Laramie Jensen1, Nathan Lanning2, Robert M Sherrell3 and Jessica N Fitzsimmons2, (1)Texas A&M University College Station, Oceanography, College Station, TX, United States, (2)Texas A&M University College Station, Oceanography, College Station, United States, (3)Rutgers University, Departments of Marine and Coastal Sciences and Earth and Planetary Sciences, New Brunswick, United States
CT33A-08
Biogeochemical controls on the mercury cycle in the Arctic Ocean (639838)
Amina Traore Schartup, Scripps Institution of Oceanography, La Jolla, United States, Lars-Eric Heimbuerger-Boavida, MIO-CNRS, Marseille, France, Anne Soerensen, Stockholm University, Stockholm, Sweden, Jeroen Sonke, GET, Toulouse, France and Elsie M Sunderland, Harvard T.H. Chan School of Public Health, Boston, United States
See more of: Chemical Tracers, Organic Matter and Trace Elements