DOI: 10.1002/2016GB005488
Scopus记录号: 2-s2.0-85022207946
论文题名: Biological production, export efficiency, and phytoplankton communities across 8000 km of the South Atlantic
作者: Howard E ; M ; , Durkin C ; A ; , Hennon G ; M ; M ; , Ribalet F ; , Stanley R ; H ; R
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 7 起始页码: 1066
结束页码: 1088
语种: 英语
英文关键词: argon
; carbon flux
; gross primary production
; net community production
; oxygen
; triple oxygen isotopes
Scopus关键词: air-sea interaction
; argon isotope
; biological production
; carbon flux
; community structure
; efficiency measurement
; microplankton
; nanoplankton
; oxygen isotope
; phytoplankton
; picoplankton
; primary production
; species diversity
; subtropical region
; tropical region
; Atlantic Ocean
; Atlantic Ocean (South)
英文摘要: In situ oxygen tracers (triple oxygen isotope and oxygen/argon ratios) were used to evaluate meridional trends in surface biological production and export efficiency across ~8000 km of the tropical and subtropical South Atlantic in March–May 2013. We used observations of picophytoplankton, nanophytoplankton, and microphytoplankton to evaluate community structure and diversity and assessed the relationships of these characteristics with production, export efficiency, and particulate organic carbon (POC) fluxes. Rates of productivity were relatively uniform along most of the transect with net community production (NCP) between 0 and 10 mmol O2 m−2 d−1, gross primary production (GPP) between 40 and 100 mmol O2 m−2 d−1, and NCP/GPP, a measure of export efficiency, ranging from 0.1 to 0.2 (0.05–0.1 in carbon units). However, notable exceptions to this basin-scale homogeneity included two locations with highly enhanced NCP and export efficiency compared to surrounding regions. Export of POC and particulate nitrogen, derived from sediment traps, correlated with GPP across the transect, over which the surface community was dominated numerically by picophytoplankton. NCP, however, did not correlate with POC flux; the mean difference between NCP and POC flux was similar to published estimates of dissolved organic carbon export from the surface ocean. The interrelated rates of production presented in this work contribute to the understanding, building on the framework of better-studied ocean basins, of how carbon is biologically transported between the atmosphere and the deep ocean. ©2017. 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/77723
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; School of Oceanography, University of Washington, Seattle, WA, United States; Moss Landing Marine Laboratories, Moss Landing, CA, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Chemistry, Wellesley College, Wellesley, MA, United States
Recommended Citation:
Howard E,M,, Durkin C,et al. Biological production, export efficiency, and phytoplankton communities across 8000 km of the South Atlantic[J]. Global Biogeochemical Cycles,2017-01-01,31(7)