CT21A:
The Role of Particles in the Cycling of Trace Elements and Their Isotopes in the Ocean I


Session ID#: 11302

Session Description:
A number of trace metals are thought to control marine ecosystem features and biological productivity. While trace elements in the dissolved phase have been the focus of many investigations, we are still largely ignorant of the large scale distribution of particulate trace elements and their size partitioning and chemical composition. The GEOTRACES program, which aims to provide a comprehensive view of the distribution of trace elements and their isotopes (TEIs) in the world's oceans, is providing new insights on these aspects. Furthermore, there is a crucial need to understand the exchange mechanisms between particulate and dissolved pools, including adsorption, desorption, aggregation, precipitation, biological uptake and remineralization processes.  This session seeks to bring together scientists interested in better constraining the role of ocean particles in the biogeochemical cycles of TEIs, in different oceanic environments, such as the continental shelves and slopes, the nepheloid layers, or the particle-poor regions of the open ocean. We invite abstracts on all aspects of oceanic particulate TEIs, through experimental, in situ and modeling approaches.
Primary Chair:  Hélène Planquette, LEMAR, CNRS, Plouzané, France
Chairs:  Phoebe J Lam, University of California Santa Cruz, Department of Ocean Sciences, Santa Cruz, CA, United States, Benjamin S Twining, Bigelow Lab for Ocean Sciences, East Boothbay, ME, United States and Hélène Planquette, LEMAR, UMR 6539, Plouzané, France
Moderators:  Hélène Planquette, LEMAR, UMR 6539, Plouzané, France, Phoebe J Lam, University of California Santa Cruz, Department of Ocean Sciences, Santa Cruz, CA, United States and Benjamin S Twining, Bigelow Lab for Ocean Sciences, East Boothbay, ME, United States
Student Paper Review Liaison:  Hélène Planquette, LEMAR, UMR 6539, Plouzané, France
Index Terms:

4211 Benthic boundary layers [OCEANOGRAPHY: GENERAL]
4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4808 Chemical tracers [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4875 Trace elements [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Co-Sponsor(s):
  • B - Biogeochemistry and Nutrients
  • HE - High Latitude Environments
  • ME - Marine Ecosystems
  • PC - Past, Present and Future Climate

Abstracts Submitted to this Session:

CT21A-01
Characterization of Mercury Particle Flux Using 238U:234Th Disequilibria in the North Pacific Subtropical Gyre (91591)
Blaire Umhau1, Laura C Motta2, Claudia R Benitez-Nelson1, Hilary G Close3,4, Cecelia C Hannides5,6, Brian N Popp7, Joel D Blum2, Jeffrey Drazen5 and Kalina Cozette Grabb8, (1)University of South Carolina, Department of Earth and Ocean Sciences, Columbia, SC, United States, (2)University of Michigan, Earth and Environmental Sciences, Ann Arbor, MI, United States, (3)U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA, United States, (4)University of California Santa Cruz, Institute of Marine Sciences, Santa Cruz, CA, United States, (5)University of Hawaii, Oceanography, Honolulu, HI, United States, (6)University of Hawaii, Geology and Geophysics, Honolulu, HI, United States, (7)University of Hawaii, Geology & Geophysics, Honolulu, HI, United States, (8)Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States
CT21A-02
Adsorption of Thorium-234 onto particles differing in surface area and surface quality (89586)
Anne Schuster and Gerhard Graf, University of Rostock, Marine Biology, Rostock, Germany
CT21A-03
Contrasting Boundary Scavenging in two Eastern Boundary Current Regimes (88830)
Robert F Anderson1, Martin Q Fleisher2, Frank J Pavia2, Sebastian M. Vivancos3, Yanbin Lu4, Pu Zhang4, Hai Cheng5 and R. Lawrence Edwards4, (1)Lamont Doherty Earth Observatory of Columbia Univeristy, Palisades, NY, United States, (2)Lamont -Doherty Earth Observatory, Palisades, NY, United States, (3)Columbia University, Department of Earth and Environmental Sciences, New York, NY, United States, (4)University of Minnesota, Minneapolis, MN, United States, (5)Xi'an Jiaotong University, Institute of Global Environmental Change, Xian, China
CT21A-04
A Decadal Record of Elemental Composition of the Particle Flux in the Deep Sargasso Sea (93426)
Maureen H Conte1, Alice Marie Carter2, David Koweek3 and John C Weber2, (1)Bermuda Institute of Ocean Sciences, St.George's, Bermuda, (2)Marine Biological Laboratory, Woods Hole, MA, United States, (3)Stanford University, Stanford, CA, United States
CT21A-05
Fe Isotope Fractionation Across the Oxic – Ferruginous Redox Transition (91088)
Michael Staubwasser, University of Cologne, Cologne, Germany and Susann Henkel, Alfred Wegener Institute, Bremerhaven, Germany
CT21A-06
Contribution of Resuspended Sediments to the Dissolved Trace Metal Pool (Fe, Mn): An Experimental Study (89037)
Marie Cheize1, Hélène Planquette1, Jessica N Fitzsimmons2, Robert M Sherrell3, Ewan Pelleter4, Christophe Lambert1, Geraldine Sarthou1, Julia Boutorh1, Eva Bucciarelli5, Manon Le Goff1, Céline Liorzou6, Sandrine Chéron4 and Nicolas Gayet7, (1)LEMAR, UMR 6539, Plouzané, France, (2)Texas A&M University, Department of Oceanography, United States, (3)Rutgers Univ, Departments of Marine and Coastal Sciences and Earth and Planetary Sciences, New Brunswick, NJ, United States, (4)Ifremer, centre de Brest, LGM, Plouzané, France, (5)IUEM Institut Universitaire Européen de la Mer, LEMAR, Plouzané, France, (6)LDO, UMR 6538, Plouzané, France, (7)Ifremer, centre de Brest, LEP, Plouzané, France
CT21A-07
On the role of Lithogenic Particles for Iron Cycling in the Atlantic Ocean (90922)
Christoph D Voelker, Alfred Wegener Institute, Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany and Ying Ye, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
CT21A-08
Particle Cycling in the Ocean based on Titanium and Particle Concentration Data from the US GEOTRACES North Atlantic Transect (89987)
Jong-mi Lee, University of California Santa Cruz, Ocean Sciences Department, Santa Cruz, CA, United States, Phoebe J Lam, University of California Santa Cruz, Department of Ocean Sciences, Santa Cruz, CA, United States and Daniel Ohnemus, Bigelow Lab for Ocean Sciences, East Boothbay, ME, United States
See more of: Chemical Tracers, DOM and Trace Metals