DOI: 10.1002/2016GB005583
Scopus记录号: 2-s2.0-85020667835
论文题名: Respiration of new and old carbon in the surface ocean: Implications for estimates of global oceanic gross primary productivity
作者: Carvalho M ; C ; , Schulz K ; G ; , Eyre B ; D
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 6 起始页码: 975
结束页码: 984
语种: 英语
英文关键词: 14C
; 18O
; O2
; ocean
; photosynthesis
; plankton
; respiration
Scopus关键词: autotrophy
; carbon
; carbon isotope
; community composition
; diatom
; flagellate
; global ocean
; irradiance
; nutrient
; oxygen isotope
; photosynthesis
; plankton
; primary production
; respiration
; temperature
; Bacillariophyta
; Mastigophora (flagellates)
英文摘要: New respiration (Rnew, of freshly fixated carbon) and old respiration (Rold, of storage carbon) were estimated for different regions of the global surface ocean using published data on simultaneous measurements of the following: (1) primary productivity using 14C (14PP); (2) gross primary productivity (GPP) based on 18O or O2; and (3) net community productivity (NCP) using O2. The ratio Rnew/GPP in 24 h incubations was typically between 0.1 and 0.3 regardless of depth and geographical area, demonstrating that values were almost constant regardless of large variations in temperature (0 to 27°C), irradiance (surface to ~100 m deep), nutrients (nutrient-rich and nutrient-poor waters), and community composition (diatoms, flagellates, etc,). As such, between 10 and 30% of primary production in the surface ocean is respired in less than 24 h, and most respiration (between 55 and 75%) was of older carbon. Rnew was most likely associated with autotrophs, with minor contribution from heterotrophic bacteria. Patterns were less clear for Rold. Short 14C incubations are less affected by respiratory losses. Global oceanic GPP is estimated to be between 70 and 145 Gt C yr−1. ©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/77728
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Coastal Biogeochemistry Research, Southern Cross University, Lismore, NSW, Australia
Recommended Citation:
Carvalho M,C,, Schulz K,et al. Respiration of new and old carbon in the surface ocean: Implications for estimates of global oceanic gross primary productivity[J]. Global Biogeochemical Cycles,2017-01-01,31(6)