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Dynamics of pCO2 and related air-ice CO2 fluxes in the Arctic coastal zone (Amundsen Gulf, Beaufort Sea)

Citation

Geilfus, N-X and Carnat, G and Papakyriakou, T and Tison, J-L and Else, B and Thomas, H and Shadwick, EH and Delille, B, Dynamics of pCO2 and related air-ice CO2 fluxes in the Arctic coastal zone (Amundsen Gulf, Beaufort Sea), Journal of Geophysical Research, 117, (C00G10) pp. 1-15. ISSN 0148-0227 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 American Geophysical Union

DOI: doi:10.1029/2011JC007118

Abstract

We present an Arctic seasonal survey of carbon dioxide partial pressure (pCO2) dynamics within sea ice brine and related air-ice CO2 fluxes. The survey was carried out from early spring to the beginning of summer in the Arctic coastal waters of the Amundsen Gulf. High concentrations of pCO2 (up to 1834 matm) were observed in the sea ice in early April as a consequence of concentration of solutes in brines, CaCO3 precipitation and microbial respiration. CaCO3 precipitation was detected through anomalies in total alkalinity (TA) and dissolved inorganic carbon (DIC). This precipitation seems to have occurred in highly saline brine in the upper part of the ice cover and in bulk ice. As summer draws near, the ice temperature increases and brine pCO3 shifts from a large supersaturation (1834 matm) to a marked undersaturation (down to almost 0 matm). This decrease was ascribed to brine dilution by ice meltwater, dissolution of CaCO3 and photosynthesis during the sympagic algal bloom. The magnitude of the CO2 fluxes was controlled by ice temperature (through its control on brine volume and brine channels connectivity) and the concentration gradient between brine and the atmosphere. However, the state of the ice-interface clearly affects air-ice CO2 fluxes.

Item Details

Item Type:Refereed Article
Keywords:air-ice CO2 flux, calcium carbonate precipitation, sea-ice
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, EH (Dr Elizabeth Shadwick)
ID Code:77500
Year Published:2012
Web of Science® Times Cited:42
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-04-23
Last Modified:2013-06-19
Downloads:0

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