The seasonal cycle of ocean-atmosphere CO2 Flux in Ryder Bay, West Antarctic Peninsula
| Autor: | Gareth A. Lee, Peter J. Brown, Dorothee C. E. Bakker, Martin Johnson, O. Legge, Hugh J. Venables, Michael P. Meredith |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences 010604 marine biology & hydrobiology Antarctic sea ice 01 natural sciences Sink (geography) Carbon cycle Marine Sciences chemistry.chemical_compound Geophysics Oceanography chemistry 13. Climate action Circumpolar deep water Carbon dioxide Dissolved organic carbon Sea ice General Earth and Planetary Sciences 14. Life underwater Bay Geology 0105 earth and related environmental sciences |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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