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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...
Autores principales: | , , , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society
2016
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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’. |
format | Online Article Text |
id | pubmed-5069537 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | The Royal Society |
record_format | MEDLINE/PubMed |
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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