The seasonal cycle of ocean-atmosphere CO2 Flux in Ryder Bay, West Antarctic Peninsula

Oliver J. Legge, Dorothee C. E. Bakker, Martin T. Johnson, Mike P. Meredith, Hugh J. Venables, Pete J. Brown, Gareth A. Lee

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38 Citations (Scopus)
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Abstract

Approximately 15 million km2 of the Southern Ocean is seasonally ice covered, yet the processes affecting carbon cycling and gas exchange in this climatically important region remain inadequately understood. Here, 3 years of dissolved inorganic carbon (DIC) measurements and carbon dioxide (CO2) fluxes from Ryder Bay on the west Antarctic Peninsula (WAP) are presented. During spring and summer, primary production in the surface ocean promotes atmospheric CO2 uptake. In winter, higher DIC, caused by net heterotrophy and vertical mixing with Circumpolar Deep Water, results in outgassing of CO2 from the ocean. Ryder Bay is found to be a net sink of atmospheric CO2 of 0.59–0.94 mol C m−2 yr−1 (average of 3 years). Seasonal sea ice cover increases the net annual CO2 uptake, but its effect on gas exchange remains poorly constrained. A reduction in sea ice on the WAP shelf may reduce the strength of the oceanic CO2 sink in this region.
Original languageEnglish
Pages (from-to)2934-2942
Number of pages9
JournalGeophysical Research Letters
Volume42
Issue number8
Early online date28 Apr 2015
DOIs
Publication statusPublished - 28 Apr 2015

Keywords

  • ocean-atmosphere CO2 flux
  • Ryder Bay
  • seasonal sea ice
  • polar time series
  • RaTS
  • carbon cycling

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