DOI: 10.1002/2016GB005551
Scopus记录号: 2-s2.0-85017394905
论文题名: The export and fate of organic matter in the ocean: New constraints from combining satellite and oceanographic tracer observations
作者: DeVries T ; , Weber T
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 3 起始页码: 535
结束页码: 555
语种: 英语
英文关键词: export production
; marine food web
; ocean carbon cycle
; phytoplankton
; remote sensing
Scopus关键词: biogeochemistry
; biological pump
; carbon cycle
; carbon flux
; data assimilation
; euphotic zone
; food web
; gyre
; marine environment
; mesopelagic zone
; organic carbon
; organic matter
; phytoplankton
; remineralization
; remote sensing
; satellite data
; tracer
; transport process
; Eragrostis tef
英文摘要: The ocean's biological pump transfers carbon from the surface euphotic zone into the deep ocean, reducing the atmospheric CO2 concentration. Despite its climatic importance, there are large uncertainties in basic metrics of the biological pump. Previous estimates of the strength of the biological pump, as measured by the amount of organic carbon exported from the euphotic zone, range from about 4 to 12 Pg C yr−1. The fate of exported carbon, in terms of how efficiently it is transferred into the deep ocean, is even more uncertain. Here we present a new model of the biological pump that assimilates satellite and oceanographic tracer observations to constrain rates and patterns of organic matter production, export, and remineralization in the ocean. The data-assimilated model predicts a global particulate organic carbon (POC) flux out of the euphotic zone of ∼9 Pg C yr−1. The particle export ratio (the ratio of POC export to net primary production) is highest at high latitudes and lowest at low latitudes, but low-latitude export is greater than predicted by previous models, in better agreement with observed patterns of long-term carbon export. Particle transfer efficiency (Teff) through the mesopelagic zone is controlled by temperature and oxygen, with highest Teff for high-latitude regions and oxygen minimum zones. In contrast, Teff in the deep ocean (below 1000 m) is controlled by particle sinking speed, with highest deep ocean Teff below the subtropical gyres. These results emphasize the utility of both remote sensing and oceanographic tracer observations for constraining the operation of the biological pump. ©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/77761
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography, University of California, Santa Barbara, CA, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States; Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, United States
Recommended Citation:
DeVries T,, Weber T. The export and fate of organic matter in the ocean: New constraints from combining satellite and oceanographic tracer observations[J]. Global Biogeochemical Cycles,2017-01-01,31(3)