Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes : lessons learned from GEOTRACES
Charette, Matthew (Woods Hole Oceanographic Institution)
Lam, Phoebe, J. (University of California, Santa Cruz. Department of Ocean Sciences)
Lohan, Maeve C. (University of Southampton. National Oceanography Centre)
Kwon, Eun Young (University of Southampton. National Oceanography Centre)
Hatje, Vanessa (Universidade Federal da Bahia. Centro Interdisciplinar de Energia e Ambiente)
Jeandel, Catherine (Centre National de la Recherche Scientifique (França))
Shiller, Alan M. (University of Southern Mississippi. Department of Marine Science)
Cutter, Gregory A. (Old Dominion University. Department of Ocean, Earth, and Atmospheric Sciences)
Thomas, Alex (University of Edinburgh. School of GeoSciences)
Boyd, P.W. (University of Tasmania. Institute of Marine and Antarctic Studies)
Homoky, William B. (University of Oxford. Department of Earth Sciences)
Milne, Angela (Plymouth University. School of Geography, Earth and Environmental Sciences)
Thomas, Helmuth (Dalhousie University. Department of Oceanography)
Andersson, Per S. (Naturhistoriska riksmuseet)
Porcelli, Don (University of Oxford. Department of Earth Sciences)
Tanaka, Takahiro (University of Tokyo. Atmosphere and Ocean Research Institute)
Geibert, Walter (Alfred-Wegener-Institut für Polar- und Meeresforschung)
Dehairs, Frank (Vrije Universiteit Brussel)
Garcia-Orellana, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Fecha:	2016
Resumen:	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 (T⅟₂ = 5. 75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf ²²⁸Ra fluxes are combined with TEI/ ²²⁸Ra 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.
Nota:	Unidad de excelencia María de Maeztu MdM-2015-0552
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	GEOTRACES ; Trace elements ; Isotopes ; Radium ; Continental shelf
Publicado en:	Philosophical transactions, Vol. 374, issue 2081 (Nov. 2016) , ISSN 1364-503X

DOI: 10.1098/rsta.2016.0076
PMID: 29035267

19 p, 1.3 MB

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