Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
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- Matthew A. Charette
- Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
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- Phoebe J. Lam
- Department of Ocean Sciences, University of California-Santa Cruz, Santa Cruz, CA 95064, USA
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- Maeve C. Lohan
- Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK
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- Eun Young Kwon
- Research Institute of Oceanography, Seoul National University, Seoul 151-742, Korea
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- Vanessa Hatje
- Centro Interdisciplinar de Energia e Ambiente, Inst. de Química, Universidade Federal da Bahia, Salvador 40170-115, Brazil
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- Catherine Jeandel
- University of Toulouse/CNRS/UPS/IRD/CNES, Observatoire Midi-Pyrénées, Toulouse 31400, France
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- Alan M. Shiller
- Department of Marine Science, University of Southern Mississippi, Stennis Space Center, MS 39529, USA
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- Gregory A. Cutter
- Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529, USA
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- Alex Thomas
- School of GeoSciences, University of Edinburgh, Edinburgh EH9 3FE, UK
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- Philip W. Boyd
- Institute of Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania 7005, Australia
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- William B. Homoky
- Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK
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- Angela Milne
- School of Geography, Earth and Environmental Sciences, Plymouth University, Plymouth PL4 8AA, UK
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- Helmuth Thomas
- Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2
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- Per S. Andersson
- Department of Geosciences, Swedish Museum of Natural History, Stockholm 104 05, Sweden
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- Don Porcelli
- Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK
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- Takahiro Tanaka
- Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa Chiba 277-8564, Japan
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- Walter Geibert
- Marine Geochemistry Department, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
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- Frank Dehairs
- Earth System Sciences and Analytical, Environmental and Geo-Chemistry, Vrije Universiteit Brussel, Brussels 1050, Belgium
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- Jordi Garcia-Orellana
- Physics Department-ICTA, Universitat Autònoma de Barcelona, Barcelona 08193, Spain
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説明
<jats:p> Continental shelves and shelf seas play a central role in the global carbon cycle. However, their importance with respect to trace element and isotope (TEI) inputs to ocean basins is less well understood. Here, we present major findings on shelf TEI biogeochemistry from the GEOTRACES programme as well as a proof of concept for a new method to estimate shelf TEI fluxes. The case studies focus on advances in our understanding of TEI cycling in the Arctic, transformations within a major river estuary (Amazon), shelf sediment micronutrient fluxes and basin-scale estimates of submarine groundwater discharge. The proposed shelf flux tracer is 228-radium ( <jats:italic>T</jats:italic> <jats:sub>1/2</jats:sub> = 5.75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf <jats:sup>228</jats:sup> Ra fluxes are combined with TEI/ <jats:sup>228</jats:sup> Ra ratios to quantify ocean TEI fluxes from the western North Atlantic margin. The results from this new approach agree well with previous estimates for shelf Co, Fe, Mn and Zn inputs and exceed published estimates of atmospheric deposition by factors of approximately 3–23. Lastly, recommendations are made for additional GEOTRACES process studies and coastal margin-focused section cruises that will help refine the model and provide better insight on the mechanisms driving shelf-derived TEI fluxes to the ocean. </jats:p> <jats:p>This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.</jats:p>
収録刊行物
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- Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374 (2081), 20160076-, 2016-11-28
The Royal Society
