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

Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES
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 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 (T1/2?=?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.
GEOTRACES, trace elements, isotopes, radium, continental shelf
1364-503X
20160076
Charette, Matthew A.
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Lam, Phoebe J.
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Lohan, M.C.
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Kwon, Eun Young
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Hatje, Vanessa
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Jeandel, Catherine
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Shiller, Alan M.
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Cutter, Gregory A.
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Thomas, Alex
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Boyd, Philip W.
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Homoky, William B.
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Milne, Angela
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Thomas, Helmuth
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Andersson, Per S.
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Porcelli, Don
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Tanaka, Takahiro
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Geibert, Walter
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Dehairs, Frank
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Garcia-Orellana, Jordi
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Charette, Matthew A.
afe63d56-266a-4819-9dfb-2669ffb204e7
Lam, Phoebe J.
edd6ad71-e42a-4157-bb1d-ef0ec23e8210
Lohan, M.C.
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Kwon, Eun Young
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Hatje, Vanessa
ade92210-2f95-48bc-a8ac-ed253c34ce79
Jeandel, Catherine
d2a06452-d4f2-4ea5-9205-845b645067c1
Shiller, Alan M.
3b976188-f9e7-47df-b52f-cde7cc1e11bd
Cutter, Gregory A.
57cf7256-d77c-4875-a8be-2b777214afa9
Thomas, Alex
71963656-a932-4502-8515-2d92f811a534
Boyd, Philip W.
af169f41-8873-4ad8-bd70-579c291dc00d
Homoky, William B.
f47c433a-bd13-4a11-88eb-96fa1a798ca3
Milne, Angela
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Thomas, Helmuth
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Andersson, Per S.
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Porcelli, Don
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Tanaka, Takahiro
98346d57-2245-425a-8149-7fcc3c13e365
Geibert, Walter
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Dehairs, Frank
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Garcia-Orellana, Jordi
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Charette, Matthew A., Lam, Phoebe J., Lohan, M.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 and Garcia-Orellana, Jordi (2016) Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 374 (2081), 20160076. (doi:10.1098/rsta.2016.0076).

Record type: Article

Abstract

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 (T1/2?=?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.

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Accepted/In Press date: 30 June 2016
e-pub ahead of print date: 17 October 2016
Published date: 28 November 2016
Keywords: GEOTRACES, trace elements, isotopes, radium, continental shelf
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 402089
URI: http://eprints.soton.ac.uk/id/eprint/402089
ISSN: 1364-503X
PURE UUID: 80476e6d-6930-4be6-8d15-1669b2189f33
ORCID for M.C. Lohan: ORCID iD orcid.org/0000-0002-5340-3108

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Date deposited: 27 Oct 2016 14:16
Last modified: 27 Apr 2022 01:57

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Contributors

Author: Matthew A. Charette
Author: Phoebe J. Lam
Author: M.C. Lohan ORCID iD
Author: Eun Young Kwon
Author: Vanessa Hatje
Author: Catherine Jeandel
Author: Alan M. Shiller
Author: Gregory A. Cutter
Author: Alex Thomas
Author: Philip W. Boyd
Author: William B. Homoky
Author: Angela Milne
Author: Helmuth Thomas
Author: Per S. Andersson
Author: Don Porcelli
Author: Takahiro Tanaka
Author: Walter Geibert
Author: Frank Dehairs
Author: Jordi Garcia-Orellana

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