DOI: 10.1002/jgrd.50622
论文题名: An investigation of the role of sedimentation for stratospheric solar radiation management
作者: Benduhn F. ; Lawrence M.G.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7905
结束页码: 7921
语种: 英语
英文关键词: Aerosol
; Atmospheric modeling
; Geoengineering
; Numerical diffusion
; Sedimentation
; Stratosphere
Scopus关键词: Aerosols
; Atmospheric movements
; Diffusion
; Particle size
; Solar radiation
; Sun
; Upper atmosphere
; Atmospheric model
; General circulation model
; Geoengineering
; Gravitational settlings
; Monodisperse aerosols
; Numerical diffusion
; Stratospheric aerosols
; Vertical distributions
; Sedimentation
; aerosol
; atmospheric modeling
; diffusion
; general circulation model
; limiting factor
; particle size
; sedimentation
; sensitivity analysis
; solar radiation
; stratosphere
; transport process
; vertical distribution
; volcanic eruption
英文摘要: Gravitational settling has been considered to be one of the limiting factors to stratospheric aerosol lifetime and therefore to the practicability and effectiveness of stratospheric solar radiation management (S-SRM, which is one of the approaches being considered for planetary-scale geoengineering or climate engineering). Given the property of numerical diffusion that is associated with sedimentation as a transport process on a discretized global grid, it is important to represent this process as accurately as possible. In this paper, newly developed sedimentation schemes are presented and validated against an analytical solution. Sensitivity studies with an aerosol chemistry general circulation model are conducted with monodisperse aerosol particles of fixed size and follow two main aims: first, to evaluate the relevance of sedimentation for the aerosol lifetime and distribution in the stratosphere as a function of particle size, and second, to explore the influence of numerical diffusion on these patterns. The relevance of sedimentation is explored further with respect to other relevant particle properties, such as shape and density. It is shown that the role of sedimentation in determining stratospheric particle lifetime is a complex function of all particle properties combined. Especially with respect to sulfate aerosol, the influence of sedimentation is conditioned by the temporal evolution of particle size. Although large enough particles for considerable sedimentation mediated removal are observed in the context of volcanic eruptions, it seems uncertain whether secondary particles of an equivalent size would be obtained in the context of S-SRM, pointing to the need for an accurate representation of aerosol growth dynamics. Key Points Sedimentation is key to limiting vertical transport of stratospheric aerosol. A non-diffusive scheme allows getting the vertical distribution right. The role of sedimentation is a complex function of all particle parameters. ©2013. 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/63533
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Max Planck Institute for Chemistry, Mainz, Germany; Institute for Advanced Sustainability Studies, Berliner Strasse 130, Potsdam DE-14467, Germany
Recommended Citation:
Benduhn F.,Lawrence M.G.. An investigation of the role of sedimentation for stratospheric solar radiation management[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)