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

• Published in: Journal of Geophysical Research: Oceans
• Main Authors: Roden, NP, Tilbrook, B, Trull, TW, Virtue, P, Williams, GD
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley-Blackwell Publishing, Inc. 2016
• Subjects: Physical Sciences; Other physical sciences; Other physical sciences not elsewhere classified; Antarctic; Austral; East Antarctica; Indian; Antarc*; Antarctica; Antarctica Journal; Sea ice
• Online Access: https://doi.org/10.1002/2016JC012008; http://ecite.utas.edu.au/114402

The carbon cycle of the seasonally ice covered region of the southwest Indian Ocean sector of East Antarctica (3080E, 6069S) was investigated during austral summer (JanuaryMarch 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 (CO 2 ) to the atmosphere of 0.8 1.6 g C m −2 during the ice-free period, with narrow bands of CO 2 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 CO 2 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 CO 2 to the atmosphere in the study area, followed by biologically driven drawdown of CO 2 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.