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Barium and carbon fluxes in the Canadian Arctic Archipelago

Citation

Thomas, H and Shadwick, E and Dehairs, F and Lansard, B and Mucci, A and Navez, J and Gratton, Y and Prowe, F and Chierici, M and Fransson, A and Papakyriakou, TN and Sternberg, E and Miller, LA and Tremblay, J and Monnin, C, Barium and carbon fluxes in the Canadian Arctic Archipelago, Journal of Geophysical Research, 116, (C12) Article C00G08. ISSN 2156-2202 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 by the American Geophysical Union

DOI: doi:10.1029/2011JC007120

Abstract

The seasonal and spatial variability of dissolved Barium (Ba) in the Amundsen Gulf,southeastern Beaufort Sea, was monitored over a full year from September 2007 to September 2008. Dissolved Ba displays a nutrient-type behavior: the maximum water column concentration is located below the surface layer. The highest Ba concentrations are typically observed at river mouths, the lowest concentrations are found in water masses of Atlantic origin. Barium concentrations decrease eastward through the Canadian Arctic Archipelago. Barite (BaSO4) saturation is reached at the maximum dissolved Ba concentrations in the subsurface layer, whereas the rest of the water column is undersaturated. A three end]member mixing model comprising freshwater from sea-ice melt and rivers, as well as upper halocline water, is used to establish their relative contributions to the Ba concentrations in the upper water column of the Amundsen Gulf. Based on water column and riverine Ba contributions, we assess the depletion of dissolved Ba by formation and sinking of biologically bound Ba (bio-Ba), from which we derive an estimate of the carbon export production. In the upper 50 m of the water column of the Amundsen Gulf, riverine Ba accounts for up to 15% of the available dissolved Ba inventory, of which up to 20% is depleted by bio-Ba formation and export. Since riverine inputs and Ba export occur concurrently, the seasonal variability of dissolved Ba in the upper water column is moderate. Assuming a fixed organic carbon to bio-Ba flux ratio, carbon export out of the surface layer is estimated at 1.8 ± 0.45 mol C m−2 yr−1. Finally, we propose a climatological carbon budget for the Amundsen Gulf based on recent literature data and our findings, the latter bridging the surface and subsurface water carbon cycles.

Item Details

Item Type:Refereed Article
Keywords:Barium, CO2, Canadian Arctic Archipelago, export production
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Coastal and Estuarine Environments
Author:Shadwick, E (Dr Elizabeth Shadwick)
ID Code:75870
Year Published:2011
Web of Science® Times Cited:9
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-02-19
Last Modified:2017-10-31
Downloads:0

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