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Annual cycles of pCO2sw in the southeastern Beaufort Sea: New understandings of air-sea CO2 exchange in arctic polynya regions


Else, BGT and Papakyriakou, TN and Galley, RJ and Mucci, A and Gosselin, M and Miller, LA and Shadwick, EH and Thomas, H, Annual cycles of pCO2sw in the southeastern Beaufort Sea: New understandings of air-sea CO2 exchange in arctic polynya regions, Journal of Geophysical Research, 117, (C9) Article C00G13. ISSN 0148-0227 (2012) [Refereed Article]

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Copyright 2012 American Geophysical Union

DOI: doi:10.1029/2011JC007346


From 23 October 2007 to 1 August 2008, we made continuous measurements of sea surface partial pressure of CO2 (pCO2sw) in three regions of the southeastern Beaufort Sea (Canada): the Amundsen Gulf, the Banks Island Shelf, and the Mackenzie Shelf. All three regions are seasonally ice covered, with mobile winter ice and an early spring opening that defines them as polynya regions. Amundsen Gulf was characterized by undersaturated pCO2sw (with respect to the atmosphere) in the late fall, followed by an under-ice increase to near saturation in winter, a return to undersaturation during the spring, and an increase to near saturation in summer. The Banks Island Shelf acted similarly, while the Mackenzie Shelf experienced high supersaturation in the fall, followed by a spring undersaturation and a complex, spatially heterogeneous summer season. None of these patterns are similar to the annual cycle described or proposed for other Arctic polynya regions. We hypothesize that the discrepancy reflects the influence of several previously unconsidered processes including fall phytoplankton blooms, upwelling, winter air-sea gas exchange, the continental shelf pump, spring nutrient limitation, summer surface warming, horizontal advection, and riverine input. In order to properly predict current and future rates of air-sea CO2 exchange in such regions, these processes must be considered on a location-by-location basis.

Item Details

Item Type:Refereed Article
Keywords:air-sea CO2 exchange, polynya, Arctic
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Measurement and assessment of estuarine water quality
UTAS Author:Shadwick, EH (Dr Elizabeth Shadwick)
ID Code:77499
Year Published:2012
Web of Science® Times Cited:32
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-04-23
Last Modified:2017-10-06
Downloads:1 View Download Statistics

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