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Carbon cycling dynamics in the seasonal sea-ice zone of East Antarctica

Citation

Roden, NP and Tilbrook, B and Trull, TW and Virtue, P and Williams, GD, Carbon cycling dynamics in the seasonal sea-ice zone of East Antarctica, Journal of Geophysical Research: Oceans, 121, (12) pp. 8749-8769. ISSN 2169-9275 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 American Geophysical Union

DOI: doi:10.1002/2016JC012008

Abstract

The carbon cycle of the seasonally ice covered region of the southwest Indian Ocean sector of East Antarctica (30°–80°E, 60°–69°S) was investigated during austral summer (January–March 2006). Large variability in the drivers and timing of carbon cycling dynamics were observed and indicated that the study site was a weak net source of carbon dioxide (CO2) to the atmosphere of 0.8 ± 1.6 g C m−2 during the ice-free period, with narrow bands of CO2 uptake observed near the continental margin and north of the Southern Antarctic Circumpolar Current Front. Continuous surface measurements of dissolved oxygen and the fugacity of CO2 were combined with net community production estimates from oxygen/argon ratios to show that surface heat gain and photosynthesis were responsible for the majority of observed surface water variability. On seasonal timescales, winter sea-ice cover reduced the flux of CO2 to the atmosphere in the study area, followed by biologically driven drawdown of CO2 as the ice retreated in spring-summer highlighting the important role that sea-ice formation and retreat has on the biogeochemical cycling of the region.

Item Details

Item Type:Refereed Article
Keywords:CO2, sea ice, oceanography
Research Division:Physical Sciences
Research Group:Other Physical Sciences
Research Field:Physical Sciences not elsewhere classified
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Roden, NP (Mr Nick Roden)
Author:Tilbrook, B (Dr Bronte Tilbrook)
Author:Trull, TW (Professor Thomas Trull)
Author:Virtue, P (Associate Professor Patti Virtue)
Author:Williams, GD (Dr Guy Williams)
ID Code:114402
Year Published:2016
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-02-15
Last Modified:2017-03-27
Downloads:0

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