CarbonBased Estimate of Nitrogen FixationDerived Net Community Production in NDepleted Ocean Gyres
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- CarbonBased Estimate of Nitrogen FixationDerived Net Community Production in NDepleted Ocean Gyres
- Other Titles
- 질소고갈 해양에서의 탄소기반의 질소고정 순생산력
- Ko, Young Ho
Karl, David M.
- Environmental Sciences & Ecology; Geology; Meteorology & Atmospheric Sciences
- net community production; nitrogen fixation; seasonal carbon drawdown; oligotrophic ocean gyre
- Issue Date
- Ko, Young Ho, et al. 2018. "CarbonBased Estimate of Nitrogen FixationDerived Net Community Production in NDepleted Ocean Gyres". GLOBAL BIOGEOCHEMICAL CYCLES, 32(8): 1241-1252.
- Accurate estimation of net community production (NCP) in the ocean is important for
determining the future trend for carbon dioxide concentrations in the atmosphere and thus for
understanding the global carbon cycle and climate change. Most methods for measuring NCP rely on analysis
of dissolved fixed inorganic nitrogen species (N), which are believed to be limiting factors for NCP. However,
in the vast areas of the ocean gyres only low levels of N are available for phytoplankton during much of
the year. In this study the NCP was estimated by summing the seasonal reduction in the concentration of
dissolved inorganic carbon (CT) in the surface mixed layer, corrected for changes associated with salinity
variation, net air-sea CO2 flux, horizontal C advection, non-Redfield diffusive C and N fluxes (deviations from
the C:N ratio of 7), and anthropogenic nitrogen deposition. The mixed layer reduction in CT was calculated
from an annual CT cycle, deduced from comprehensive records of surface pCO2 and total alkalinity, using an
established thermodynamic model. This method yielded a value of 0.6 ± 0.2 Pg of C, which represents
the NCP that occurred during the warming period (approximately 8 months) in the nitrate-depleted
(<0.2 μmol/kg) ocean. Our estimate is broadly consistent with the global N2 fixation rate estimated using the
15N-based method and suggests that N2 fixation by microorganisms is a major driver for this NCP.
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