CT21A:
Abiotic and Biotic Retention, Recycling, and Remineralization of Metals in the Ocean III


Session ID#: 37174

Session Description:
Trace metals shape both the biogeochemical functioning and the biological structure of oceanic provinces, and considerable insight into trace metal distributions have been gleaned from international programs like GEOTRACES. To date, observational and modelling efforts have mainly focused on modes of external metal supply from different sources. While this has yielded important advances, we also know that metals undergo key internal transformations such as biotic uptake, scavenging, recycling, and remineralization. These internal transformations play crucial roles in shaping the biogeochemical cycling of metals by governing their bioavailability, oceanic distributions, and residence times. In this session we solicit presentations that address key questions regarding the abiotic and biotic processes regulating (i) the retention timescale for metals in the upper ocean, (ii) surface ocean metal recycling and bioavailability, (iii) the subsurface regeneration length scales for metals in the ocean interior, and (iv) the role of mineral versus organic characteristics of sinking particles on metal scavenging. We also seek presentations that provide insights into how these key questions are mediated by differing physico-chemical and microbial processes in contrasting ocean settings. Presentations showing insights from the diverse standpoints of biogeochemical oceanography and molecular ecology, from both observational and modelling perspectives, are strongly encouraged.
Primary Chair:  Philip W Boyd, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, TAS, Australia
Co-chairs:  Kristen N Buck, University of South Florida Tampa, College of Marine Science, Tampa, FL, United States; University of South Florida, College of Marine Science, St. Petersburg, FL, United States, Jessica N Fitzsimmons, Texas A&M University College Station, Department of Oceanography, College Station, TX, United States and Alessandro Tagliabue, University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom
Moderators:  Jessica N Fitzsimmons, Texas A&M University College Station, Department of Oceanography, College Station, TX, United States, Kristen N Buck, University of South Florida, St, Bermuda and Alessandro Tagliabue, University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom
Student Paper Review Liaison:  Alessandro Tagliabue, University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom
Index Terms:

4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4807 Chemical speciation and complexation [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4840 Microbiology and microbial ecology [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4875 Trace elements [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Cross-Topics:
  • BN - Biogeochemistry and Nutrients
  • MM - Microbiology and Molecular Ecology
  • OM - Ocean Modeling

Abstracts Submitted to this Session:

Iron and carbon speciation in the far-field GP 16 Southern East Pacific Rise hydrothermal plume (314006)
Colleen Lynn Hoffman1, Sarah L Nicholas2, Jessica N Fitzsimmons3,4, Daniel Ohnemus5, Robert M Sherrell6, Christopher R German7, Maija Iris Heller8, Jong-Mi Lee9, Phoebe J Lam9 and Brandy M Toner10, (1)University of Minnesota Twin Cities, Earth Science, Minneapolis, MN, United States, (2)National University of Ireland, iCRAG (Irish Center for Research in Applied Geosciences), Galway, Ireland, (3)Rutgers University New Brunswick, New Brunswick, NJ, United States, (4)Texas A&M University College Station, Department of Oceanography, College Station, TX, United States, (5)Bigelow Lab for Ocean Sciences, East Boothbay, ME, United States, (6)Rutgers Univ, Departments of Marine and Coastal Sciences and Earth and Planetary Sciences, New Brunswick, NJ, United States, (7)WHOI, Woods Hole, MA, United States, (8)IFREMER, REM/GM/LCG, Plouzane, France, (9)University of California Santa Cruz, Department of Ocean Sciences, Santa Cruz, CA, United States, (10)Department of Soil, Water and Climate, University of Minnesota, Saint Paul, MN, United States
Particulate export and upper ocean residence times of trace metals in the southeastern tropical Pacific (311367)
Erin E Black1, Phoebe J Lam2, Jong-Mi Lee3 and Ken Buesseler1, (1)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (2)University of California Santa Cruz, Department of Ocean Sciences, Santa Cruz, CA, United States, (3)University of California Santa Cruz, Santa Cruz, CA, United States
Incorporation of Zinc into Frustules of Antarctic Diatoms (317781)
Ellery D Ingall1, Lesley A Brewer1, Mary Francis Moser McDaniel1 and Peter L Morton2, (1)Georgia Institute of Technology Main Campus, Atlanta, GA, United States, (2)Florida State University, Earth, Ocean and Atmospheric Science, Tallahassee, FL, United States
Hydroxamate siderophores moieties responsible for scavenging Fe and particle-reactive radionuclides (Th, Pa and Po) are present in marine sinking particles as detected by ESI-FTICRMS (315548)
Chen Xu1, Peng Lin1, Kathleen Schwehr1, Wei Xing2, Luni Sun1, Alexandra Yard3, Patrick Hatcher4, Maureen H Conte5 and Peter H Santschi6, (1)Texas A&M University at Galveston, Department of Marine Sciences, Galveston, TX, United States, (2)Texas A&M University at Galveston, Marine Science, Galveston, TX, United States, (3)Texas A&M University at Galveston, Marine Biology, Galveston, TX, United States, (4)Old Dominion University, Chemistry and Biochemistry, Norfolk, VA, United States, (5)Bermuda Institute of Ocean Sciences, St.George's, GE, Bermuda, (6)Texas A & M University, College Station, TX, United States
Dynamic Cycling of Siderophores During the Growth and Decline of an Iron-Limited Phytoplankton Assemblage in a Southern Ocean Mesocosm Experiment (317803)
Randelle M Bundy1, Kristen N Buck2, Shannon Burns2, Alexa R Sterling3, Laura Z. Holland4, Daniel Repeta5, Dreux Chappell6 and Bethany D. Jenkins7, (1)University of Washington, School of Oceanography, Seattle, WA, United States, (2)University of South Florida, College of Marine Science, St. Petersburg, FL, United States, (3)University of Rhode Island, Cell and Molecular Biology, Kingston, RI, United States, (4)University of Rhode Island, Cell and Molecular Biology and Graduate School of Oceanography, Kingston, RI, United States, (5)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (6)Old Dominion University, Ocean, Earth and Atmospheric Sciences, Norfolk, VA, United States, (7)University of Rhode Island, Cell and Molecular Biology and Graduate School of Oceanography, Narragansett, RI, United States
Characterization of particulate Mn in the East Pacific Rise hydrothermal plume (314305)
Jong-Mi Lee, University of California Santa Cruz, Santa Cruz, CA, United States, Maija Iris Heller, IFREMER, REM/GM/LCG, Plouzane, France and Phoebe J Lam, University of California Santa Cruz, Department of Ocean Sciences, Santa Cruz, CA, United States
A Hypothetical Role of Manganese-oxidizing Bacteria on the Distribution of Particulate Metals in the Canadian Arctic Ocean (317821)
Maria Teresa Maldonado1, Jingxuan LI2, Julie LaRoche3, Dhwani Desai3, Manuel Colombo1, Alexis Beaupré-Laperrière4, Kristin J Orians5 and Alfonso Mucci4, (1)University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada, (2)MIT-WHOI Joint Program, Chemical Oceanography, Woods Hole, MA, United States, (3)Dalhousie University, Department of Biology, NS, Canada, (4)McGill University, Department of Earth and Planetary Sciences, Montreal, QC, Canada, (5)Univ British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada

See more of: Chemical Tracers, Organic Matter and Trace Elements