DOI: 10.1002/2017GB005652
Scopus记录号: 2-s2.0-85030851292
论文题名: Stirring Up the Biological Pump: Vertical Mixing and Carbon Export in the Southern Ocean
作者: Stukel M ; R ; , Ducklow H ; W
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 9 起始页码: 1420
结束页码: 1434
语种: 英语
英文关键词: carbon cycle
; carbon export
; mixing
; nitrogen cycle
; plankton
; subduction
Scopus关键词: biological pump
; carbon cycle
; nitrogen cycle
; plankton
; subduction
; vertical mixing
; Southern Ocean
英文摘要: The biological carbon pump (BCP) transports organic carbon from the surface to the ocean's interior via sinking particles, vertically migrating organisms, and passive transport of organic matter by advection and diffusion. While many studies have quantified sinking particles, the magnitude of passive transport remains poorly constrained. In the Southern Ocean weak thermal stratification, strong vertical gradients in particulate organic matter, and weak vertical nitrate gradients suggest that passive transport from the euphotic zone may be particularly important. We compile data from seasonal time series at a coastal site near Palmer Station, annual regional cruises in the Western Antarctic Peninsula (WAP), cruises throughout the broader Southern Ocean, and SOCCOM (Southern Ocean Carbon and Climate Observations and Modeling) autonomous profiling floats to estimate spatial and temporal patterns in vertical gradients of nitrate, particulate nitrogen (PN), and dissolved organic carbon. Under a steady state approximation, the ratio of ∂PN/∂z to ∂NO3 −/∂z suggests that passive transport of PN may be responsible for removing 46% (37%–58%) of the nitrate introduced into the surface ocean of the WAP (with dissolved organic matter contributing an additional 3–6%) and for 23% (19%–28%) of the BCP in the broader Southern Ocean. A simple model parameterized with in situ nitrate, PN, and primary production data suggested that passive transport was responsible for 54% of the magnitude of the BCP in the WAP. Our results highlight the potential importance of passive transport (by advection and diffusion) of organic matter in the Southern Ocean but should only be considered indicative of high passive transport (rather than conclusive evidence) due to our steady state assumptions. ©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/77704
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Stukel M,R,, Ducklow H,et al. Stirring Up the Biological Pump: Vertical Mixing and Carbon Export in the Southern Ocean[J]. Global Biogeochemical Cycles,2017-01-01,31(9)