DOI: 10.1002/2013GB004728
Scopus记录号: 2-s2.0-84899039323
论文题名: The viscosity effect on marine particle flux: A climate relevant feedback mechanism
作者: Taucher J ; , Bach L ; T ; , Riebesell U ; , Oschlies A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 4 起始页码: 415
结束页码: 422
语种: 英语
英文关键词: biogeochemistry
; climate change
; marine carbon cycle
; particle sinking
Scopus关键词: Atmospheric chemistry
; Atmospheric temperature
; Biogeochemistry
; Carbon
; Carbon dioxide
; Climate change
; Feedback control
; Global warming
; Oceanography
; Viscosity
; Atmospheric carbon dioxide
; Biogeochemical cycling
; Efficiency increase
; Global climate system
; Marine carbon cycle
; Negative feedback mechanism
; Oceanic carbon uptake
; Surface temperatures
; Seawater effects
; biological pump
; carbon cycle
; climate feedback
; climate modeling
; deep sea
; particle motion
; respiration
; simulation
; viscosity
; water temperature
英文摘要: Oceanic uptake and long-term storage of atmospheric carbon dioxide (CO 2) are strongly driven by the marine "biological pump," i.e., sinking of biotically fixed inorganic carbon and nutrients from the surface into the deep ocean (Sarmiento and Bender,; Volk and Hoffert,). Sinking velocity of marine particles depends on seawater viscosity, which is strongly controlled by temperature (Sharqawy et al.,). Consequently, marine particle flux is accelerated as ocean temperatures increase under global warming (Bach et al.,). Here we show that this previously overlooked "viscosity effect" could have profound impacts on marine biogeochemical cycling and carbon uptake over the next centuries to millennia. In our global warming simulation, the viscosity effect accelerates particle sinking by up to 25%, thereby effectively reducing the portion of organic matter that is respired in the surface ocean. Accordingly, the biological carbon pump's efficiency increases, enhancing the sequestration of atmospheric CO2 into the ocean. This effect becomes particularly important on longer time scales when warming reaches the ocean interior. At the end of our simulation (4000 A.D.), oceanic carbon uptake is 17% higher, atmospheric CO2 concentration is 180 ppm lower, and the increase in global average surface temperature is 8% weaker when considering the viscosity effect. Consequently, the viscosity effect could act as a long-term negative feedback mechanism in the global climate system. Key Points Global warming reduces seawater viscosity, thus accelerating particle sinking Faster sinking enhances the biological pump and oceanic carbon uptake This "viscosity effect" is a previously overlooked climate feedback mechanism ©2014. 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/77475
Appears in Collections: 气候变化事实与影响
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Recommended Citation:
Taucher J,, Bach L,T,et al. The viscosity effect on marine particle flux: A climate relevant feedback mechanism[J]. Global Biogeochemical Cycles,2014-01-01,28(4)