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...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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Online Access: | http://dx.doi.org/10.1098/rsta.2016.0076 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2016.0076 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2016.0076 |
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crroyalsociety:10.1098/rsta.2016.0076 2024-06-23T07:50:38+00:00 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 US NSF Korea NRF U.K. NERC U.K. NERC 2016 http://dx.doi.org/10.1098/rsta.2016.0076 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2016.0076 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2016.0076 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 374, issue 2081, page 20160076 ISSN 1364-503X 1471-2962 journal-article 2016 crroyalsociety https://doi.org/10.1098/rsta.2016.0076 2024-06-10T04:15:12Z 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’. Article in Journal/Newspaper Arctic North Atlantic The Royal Society Arctic Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374 2081 20160076 |
institution |
Open Polar |
collection |
The Royal Society |
op_collection_id |
crroyalsociety |
language |
English |
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’. |
author2 |
US NSF Korea NRF U.K. NERC U.K. NERC |
format |
Article in Journal/Newspaper |
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 |
spellingShingle |
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 |
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. |
title |
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_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_sort |
coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from geotraces |
publisher |
The Royal Society |
publishDate |
2016 |
url |
http://dx.doi.org/10.1098/rsta.2016.0076 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2016.0076 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2016.0076 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic North Atlantic |
genre_facet |
Arctic North Atlantic |
op_source |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 374, issue 2081, page 20160076 ISSN 1364-503X 1471-2962 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsta.2016.0076 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
374 |
container_issue |
2081 |
container_start_page |
20160076 |
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1802641536303759360 |