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Metabolic balance of coastal Antarctic waters revealed by autonomous pCO2 and ΔO2/Ar measurements

Author(s): Tortell, Philippe D; Asher, Elizabeth C; Ducklow, Hugh W; Goldman, Johanna AL; Dacey, John WH; et al

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Abstract: We use autonomous gas measurements to examine the metabolic balance (photosynthesis minus respiration) of coastal Antarctic waters during the spring/summer growth season. Our observations capture the development of a massive phytoplankton bloom and reveal striking variability in p CO2 and biological oxygen saturation (ΔO2/Ar) resulting from large shifts in community metabolism on time scales ranging from hours to weeks. Diel oscillations in surface gases are used to derive a high‐resolution time series of net community production (NCP) that is consistent with 14C‐based primary productivity estimates and with the observed seasonal evolution of phytoplankton biomass. A combination of physical mixing, grazing, and light availability appears to drive variability in coastal Antarctic NCP, leading to strong shifts between net autotrophy and heterotrophy on various time scales. Our approach provides insight into the metabolic responses of polar ocean ecosystems to environmental forcing and could be employed to autonomously detect climate‐dependent changes in marine primary productivity.
Publication Date: 4-Aug-2014
Electronic Publication Date: 3-Oct-2014
Citation: Tortell, Philippe D., Elizabeth C. Asher, Hugh W. Ducklow, Johanna A.L. Goldman, John WH Dacey, Joseph J. Grzymski, Jodi N. Young, Sven A. Kranz, Kim S. Bernard, and François MM Morel. "Metabolic balance of coastal Antarctic waters revealed by autonomous pCO2 and ΔO2/Ar measurements." Geophysical Research Letters 41, no. 19 (2014): 6803-6810. doi:10.1002/ 2014GL061266.
DOI: doi:10.1002/ 2014GL061266
ISSN: 0094-8276
EISSN: 1944-8007
Pages: 6803 - 6810
Type of Material: Journal Article
Journal/Proceeding Title: Geophysical Research Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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