DOI: 10.1029/2017GB005634
论文题名: Carbon-Based Estimate of Nitrogen Fixation-Derived Net Community Production in N-Depleted Ocean Gyres
作者: Ko Y.H. ; Lee K. ; Takahashi T. ; Karl D.M. ; Kang S.-H. ; Lee E.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 8 语种: 英语
英文关键词: air-sea interaction
; atmosphere-ocean system
; atmospheric deposition
; carbon dioxide
; carbon fixation
; climate change
; dissolved inorganic carbon
; drawdown
; estimation method
; global ocean
; gyre
; limiting factor
; microbial activity
; net ecosystem production
; nitrogen fixation
; oligotrophic environment
; phytoplankton
; salinity
; thermodynamics
学科: net community production
; nitrogen fixation
; oligotrophic ocean gyre
; seasonal carbon drawdown
中文摘要: 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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160206
Appears in Collections: 气候变化与战略
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作者单位: Division of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawai‘i at Mānoa, Honolulu, HI, United States; Division of Polar Ocean Sciences, Korea Polar Research Institute, KIOST, Incheon, South Korea; Ocean Research Division, Korea Hydrographic and Oceanographic Agency, Busan, South Korea
Recommended Citation:
Ko Y.H.,Lee K.,Takahashi T.,et al. Carbon-Based Estimate of Nitrogen Fixation-Derived Net Community Production in N-Depleted Ocean Gyres[J]. Global Biogeochemical Cycles,2018-01-01,32(8)