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Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES

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 we...

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Autores principales: Charette, Matthew A., Lam, Phoebe J., Lohan, Maeve C., Kwon, Eun Young, Hatje, Vanessa, Jeandel, Catherine, Shiller, Alan M., Cutter, Gregory A., Thomas, Alex, Boyd, Philip W., Homoky, William B., Milne, Angela, Thomas, Helmuth, Andersson, Per S., Porcelli, Don, Tanaka, Takahiro, Geibert, Walter, Dehairs, Frank, Garcia-Orellana, Jordi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5069537/
https://www.ncbi.nlm.nih.gov/pubmed/29035267
http://dx.doi.org/10.1098/rsta.2016.0076
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author Charette, Matthew A.
Lam, Phoebe J.
Lohan, Maeve C.
Kwon, Eun Young
Hatje, Vanessa
Jeandel, Catherine
Shiller, Alan M.
Cutter, Gregory A.
Thomas, Alex
Boyd, Philip W.
Homoky, William B.
Milne, Angela
Thomas, Helmuth
Andersson, Per S.
Porcelli, Don
Tanaka, Takahiro
Geibert, Walter
Dehairs, Frank
Garcia-Orellana, Jordi
author_facet Charette, Matthew A.
Lam, Phoebe J.
Lohan, Maeve C.
Kwon, Eun Young
Hatje, Vanessa
Jeandel, Catherine
Shiller, Alan M.
Cutter, Gregory A.
Thomas, Alex
Boyd, Philip W.
Homoky, William B.
Milne, Angela
Thomas, Helmuth
Andersson, Per S.
Porcelli, Don
Tanaka, Takahiro
Geibert, Walter
Dehairs, Frank
Garcia-Orellana, Jordi
author_sort Charette, Matthew A.
collection PubMed
description 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 (T(1/2) = 5.75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf (228)Ra fluxes are combined with TEI/ (228)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. This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.
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spelling pubmed-50695372016-11-28 Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES Charette, Matthew A. Lam, Phoebe J. Lohan, Maeve C. Kwon, Eun Young Hatje, Vanessa Jeandel, Catherine Shiller, Alan M. Cutter, Gregory A. Thomas, Alex Boyd, Philip W. Homoky, William B. Milne, Angela Thomas, Helmuth Andersson, Per S. Porcelli, Don Tanaka, Takahiro Geibert, Walter Dehairs, Frank Garcia-Orellana, Jordi Philos Trans A Math Phys Eng Sci Articles 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 (T(1/2) = 5.75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf (228)Ra fluxes are combined with TEI/ (228)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. This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’. The Royal Society 2016-11-28 /pmc/articles/PMC5069537/ /pubmed/29035267 http://dx.doi.org/10.1098/rsta.2016.0076 Text en © 2015 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Articles
Charette, Matthew A.
Lam, Phoebe J.
Lohan, Maeve C.
Kwon, Eun Young
Hatje, Vanessa
Jeandel, Catherine
Shiller, Alan M.
Cutter, Gregory A.
Thomas, Alex
Boyd, Philip W.
Homoky, William B.
Milne, Angela
Thomas, Helmuth
Andersson, Per S.
Porcelli, Don
Tanaka, Takahiro
Geibert, Walter
Dehairs, Frank
Garcia-Orellana, Jordi
Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
title Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
title_full Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
title_fullStr Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
title_full_unstemmed Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
title_short Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
title_sort coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from geotraces
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5069537/
https://www.ncbi.nlm.nih.gov/pubmed/29035267
http://dx.doi.org/10.1098/rsta.2016.0076
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