BN31A:
Advances in the Marine Silicon Cycle I


Session ID#: 37105

Session Description:
There has been significant advancement in our understanding of the marine silicon (Si) cycle. Many studies have highlighted whether the Si cycle can be considered in steady state, and the potential mechanisms for the “missing silica sink” such as the burial of silica by siliceous sponges and the contribution of reverse weathering in high sedimentation rate continental margins. Rates of Si inputs to the ocean have been revisited through the delivery of reactive amorphous silica or of silicic acid by rivers, subglacial lakes, submarine groundwater discharge, hydrothermal activities, and low temperature basalt dissolution on continental margins and in the deep sea. In parallel, the important roles non-diatom groups (e.g., sponges, Rhizarians, picocyanobacteria) play in biogenic silica production, dissolution, export, and burial have been revisited. However, the rates associated with these recently-studied processes are poorly constrained. This session will address these and other key issues related to the biogeochemical cycling of Si and to the budget of Si at world ocean or regional scales (e.g. high latitudes, coastal systems). Submissions highlighting new insights into the marine Si cycle and/or methodological advancements which will enable new exploration are welcome.
Primary Chair:  Paul J Treguer, University of Western Brittany, Brest, France
Co-chairs:  Jeffrey W Krause, Dauphin Island Sea Lab, Dauphin Island, AL, United States, Shaily Rahman, University of Florida, Geological Sciences, Gainesville, FL, United States and Manuel Maldonado, Center for Advanced Studies of Blanes (CEAB, CSIC), Department of Marine Ecology, Blanes, Spain
Moderators:  Manuel Maldonado, Center for Advanced Studies of Blanes (CEAB, CSIC), Department of Marine Ecology, Blanes, Spain and Shaily Rahman, University of Florida, Geological Sciences, Gainesville, FL, United States
Student Paper Review Liaison:  Jeffrey W Krause, University of South Alabama, Department of Marine Sciences, Mobile, AL, United States
Index Terms:

4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4825 Geochemistry [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4845 Nutrients and nutrient cycling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4855 Phytoplankton [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Cross-Topics:
  • HE - High Latitude Environments
  • PC - Past, Present and Future Climate
  • RS - Regional Studies

Abstracts Submitted to this Session:

Global inputs of dissolved silica from submarine groundwater discharge – implications for the global silica budget (311681)
Matthew A Charette, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Joe Tamborski, Stony Brook University, Geosciences, Stony Brook, NY, United States, Shaily Rahman, Stony Brook University, School of Marine and Atmospheric Sciences, Stony Brook, NY, United States and J. Kirk Cochran, Stony Brook University, Stony Brook, NY, United States
Rhizaria: An Unexpected Role in the Carbon Biological Pump, and in the Silica Cycle (304329)
Aude Leynaert1, Natalia Llopis Monferrer2, Miguel Mendez Sandin3, Paul Tréguer2 and Fabrice Not4, (1)CNRS, LEMAR IUEM, Plouzané, France, (2)University of Western Brittany, Brest, France, (3)Station Biologique de Roscoff, Roscoff, France, (4)CNRS, Station Biologique, Roscoff, France
High-latitude shelf seas and the global silicon budget: The role of sediment-water interactions in the supply of nutrients to the oceans (306340)
Katharine R Hendry1, Lucie Cassarino2, Hong Chin Ng1, James Ward1, Sandra Arndt3 and Christian März4, (1)University of Bristol, Bristol, United Kingdom, (2)University of Bristol, Earth Sciences, Bristol, United Kingdom, (3)Université Libre de Bruxelles, Brussel, Belgium, (4)Millinocket, ME, United States
The subpolar gyre regulates silicate concentrations in the North Atlantic (308459)
Hjálmar Hátún, Faroe Marine Research Institute, Environmentl, Tórshavn, Faroe Islands, Jon Olafsson, Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland, Kumiko Azetsu-Scott, Bedford Inst Oceanography, Dartmouth, NS, Canada, Raquel Somavilla, Instituto Español Oceanografía, Santander, Spain, Uwe Mikolajejewicz, Max Planck Institute for Meteorology, Hamburg, Germany, Pierre Coupel, Takuvik Joint International Laboratory, Département de Biologie and Québec-Océan, QC, Canada, Jean-Eric Tremblay, Laval University, Biologie, Quebec City, QC, Canada, Selma Pacariz, University of Gothenburg, Department of Earth Sciences, Gothenburg, Sweden, Ian Salter, Faroe Marine Research Institute, Tórshavn, Faroe Islands, Francisco Rey, IMR, Norway, Clare Johnson, SAMS, United Kingdom, Moritz Mathis, MPI, Germany and Susan Hartman, NOC, United Kingdom
Reorganization of biogenic Si burial decreased reverse weathering, increased seawater Mg/Ca, and cooled the Earth over the past 65 million years (314506)
Ann G Dunlea, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Richard W Murray, Boston University, Earth and Environment, Boston, MA, United States, Danielle Priscilla Santiago Ramos, Princeton University, Princeton, NJ, United States and John A Higgins, Princeton University, Department of Geosciences, Princeton, NJ, United States
From the Bering Sea to Baffin Bay: Biogenic Silica Production and Natural Silicon Isotopic Signatures across the Arctic Ocean (315543)
Diana E Varela1, Karina E Giesbrecht2, Gregory F. de Souza3 and Colin Maden3, (1)University of Victoria, Department of Biology & School of Earth and Ocean Sciences, Victoria, BC, Canada, (2)University of Victoria, Victoria, BC, Canada, (3)ETH Zurich, Institute of Geochemistry and Petrology, Zurich, Switzerland

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