eCite Digital Repository

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

Citation

Charette, MA and Lam, PJ and Lohan, MC and Kwon, EY and Hatje, V and Jeandel, C and Shiller, AM and Cutter, GA and Thomas, A and Boyd, PW and Homoky, WB and Milne, A and Thomas, H and Andersson, PS and Porcelli, D and Tanaka, T and Geibert, W and Dehairs, F and Garcia-Orellana, J, 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) Article 20160076. ISSN 1364-503X (2016) [Refereed Article]


Preview
PDF
1Mb
  

Copyright Statement

Copyright 2016 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1098/rsta.2016.0076

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 323. 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.

Item Details

Item Type:Refereed Article
Keywords:iron biogeochemistry, cross shelf transport, GEOTRACES, trace elements, isotopes, radium, continental shelf
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
Author:Boyd, PW (Professor Philip Boyd)
ID Code:114114
Year Published:2016
Web of Science® Times Cited:11
Deposited By:Ecology and Biodiversity
Deposited On:2017-02-07
Last Modified:2018-04-19
Downloads:16 View Download Statistics

Repository Staff Only: item control page