Primary productivity, new productivity, and their relation to carbon flux during two Southern Ocean Gas Exchange tracer experiments

Biological uptake rates of inorganic carbon and nitrate were measured during two sequential tracer release gas exchange experiments, together known as the Southern Ocean Gas Exchange Experiment (SO GasEx) in the southwest Atlantic sector of the Southern Ocean Antarctic Zone (51°N, 38°W). Primary pro...

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Bibliographic Details
Published in:Journal of Geophysical Research: Oceans 2012-04, Vol.117 (C4), p.n/a
Main Authors: Lance, Veronica P., Strutton, Peter G., Vaillancourt, Robert D., Hargreaves, Bruce R., Zhang, Jia-Zhong, Marra, John
Format: Article
Language:English
Subjects:
Biological oceanography
carbon flux
Chemical oceanography
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geophysics
Marine
new production
Oceanography
Physical oceanography
primary productivity
SO GasEx
Southern Ocean
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Summary:Biological uptake rates of inorganic carbon and nitrate were measured during two sequential tracer release gas exchange experiments, together known as the Southern Ocean Gas Exchange Experiment (SO GasEx) in the southwest Atlantic sector of the Southern Ocean Antarctic Zone (51°N, 38°W). Primary productivity estimated from 14C incubations ranged from 26.7 to 47.2 mmol C m−2 d−1 in the first experiment (Patch 1) and 13.7 to 39.4 mmol C m−2 d−1 in the second experiment (Patch 2). Nitrate‐based productivity estimated from 15NO3 incubations ranged from 5.8 to 13.1 mmol C m−2 d−1 in Patch 1 and 1.9 to 7.1 mmol C m−2 d−1 in Patch 2. The average ratio of nitrate‐based productivity to primary productivity (approximating the f ratio) was 0.24 in Patch 1 and 0.15 in Patch 2. Chlorophyll concentrations for both patches were less than 1 mg m−3. Photochemical efficiency (Fv/Fm) was low (∼0.3) in Patch 1 and moderate (∼0.45) in Patch 2. Si(OH)4 concentrations were potentially limiting (
ISSN:0148-0227
2169-9275
2156-2202
2169-9291
DOI:10.1029/2011JC007687