Estimated net community production during the summertime at the SEATS time-series study site, northern South China Sea: Implications for nitrogen fixation

Details Estimated net community production during the summertime at the SEATS time-series study site, northern South China Sea: Implications for nitrogen fixation Estimated net community production during the summertime at the SEATS time-series study site, northern South China Sea: Implications for nitrogen fixation

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3322610c&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 22, CiteID L22610

Mathematics

Logic

7

Biogeosciences: Nitrogen Cycling, Oceanography: Biological And Chemical (0460), Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Carbon Cycling (0428), Oceanography: General: Marginal And Semi-Enclosed Seas

Scientific paper

The continuous summertime drawdown of normalized dissolved inorganic carbon has been observed repeatedly in the mixed-layer at the South East Asia Time-series Study (SEATS) site, northern South China Sea (SCS) between March 2002 and November 2004. Mass balance calculation reveals that a net community production (NCP) of -4.47 mmolC m-2 day-1 is responsible for this drawdown. Nonetheless, bioavailable nitrogen (Nbio) from atmospheric deposition, vertical diffusion, and N2-fixation by Trichodesmium and Richelia together could only account for ~55% of Nbio required for the calculated NCP. Unicellular cyanobacteria, which are identified unambiguously by the presence of nitrogenase genes (nifH) in 1-10 μm fraction of planktons collected at SEATS, may account for the Nbio deficit. Our results, thus, support the potential importance of unicellular cyanobacteria in providing an additional Nbio source in oligotrophic waters such as the SCS.

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