DOI: 10.1002/2017GB005638
Scopus记录号: 2-s2.0-85022195060
论文题名: Slow-sinking particulate organic carbon in the Atlantic Ocean: Magnitude, flux, and potential controls
作者: Baker C ; A ; , Henson S ; A ; , Cavan E ; L ; , Giering S ; L ; C ; , Yool A ; , Gehlen M ; , Belcher A ; , Riley J ; S ; , Smith H ; E ; K ; , Sanders R
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 7 起始页码: 1051
结束页码: 1065
语种: 英语
英文关键词: carbon flux
; modelling
; organic particles
; particulate organic carbon
; slow sinking
Scopus关键词: carbon flux
; carbon sequestration
; carbon sink
; concentration (composition)
; flux measurement
; mineralization
; modeling
; particulate organic carbon
; sampler
; vertical distribution
; Atlantic Ocean
; Southern Ocean
英文摘要: The remineralization depth of particulate organic carbon (POC) fluxes exported from the surface ocean exerts a major control over atmospheric CO₂ levels. According to a long-held paradigm most of the POC exported to depth is associated with large particles. However, recent lines of evidence suggest that slow-sinking POC (SSPOC) may be an important contributor to this flux. Here we assess the circumstances under which this occurs. Our study uses samples collected using the Marine Snow Catcher throughout the Atlantic Ocean, from high latitudes to midlatitudes. We find median SSPOC concentrations of 5.5 μg L−1, 13 times smaller than suspended POC concentrations and 75 times higher than median fast-sinking POC (FSPOC) concentrations (0.07 μg L−1). Export fluxes of SSPOC generally exceed FSPOC flux, with the exception being during a spring bloom sampled in the Southern Ocean. In the Southern Ocean SSPOC fluxes often increase with depth relative to FSPOC flux, likely due to midwater fragmentation of FSPOC, a process which may contribute to shallow mineralization of POC and hence to reduced carbon storage. Biogeochemical models do not generally reproduce this behavior, meaning that they likely overestimate long-term ocean carbon storage. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77724
Appears in Collections: 气候变化事实与影响
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作者单位: National Oceanography Centre, Southampton, United Kingdom; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, United Kingdom; Now at Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; LSCE/IPSL, Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ Orme des Merisiers, Gif-sur-Yvette, France
Recommended Citation:
Baker C,A,, Henson S,et al. Slow-sinking particulate organic carbon in the Atlantic Ocean: Magnitude, flux, and potential controls[J]. Global Biogeochemical Cycles,2017-01-01,31(7)