DOI: 10.1175/JCLI-D-17-0839.1
Scopus记录号: 2-s2.0-85049724365
论文题名: The influence of aerosol absorption on the extratropical circulation
作者: Shen Z. ; Ming Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 15 起始页码: 5961
结束页码: 5975
语种: 英语
英文关键词: Aerosols
; Atmosphere
; Climate models
; Eddies
; Extratropics
; Large-scale motions
Scopus关键词: Aerosols
; Atmospheric aerosols
; Boundary layers
; Climate models
; Earth atmosphere
; Fighter aircraft
; Heat flux
; Oceanography
; Surface waters
; Troposphere
; Atmospheric general circulation models
; Eddies
; Extratropical circulation
; Extratropics
; Large scale motion
; Large-scale circulation
; Meridional temperature gradient
; Sea surface temperature (SST)
; Atmospheric temperature
; absorption
; aerosol
; atmospheric general circulation model
; baroclinic motion
; black carbon
; boundary layer
; climate forcing
; climate modeling
; eddy
; extratropical environment
; sea surface temperature
; troposphere
英文摘要: This study examines how aerosol absorption affects the extratropical circulation by analyzing the response to a globally uniform increase in black carbon (BC) simulated with an atmospheric general circulation model forced by prescribed sea surface temperatures. The model includes aerosol direct and semidirect effects, but not indirect or cloud-absorption effects. BC-induced heating in the free troposphere stabilizes the midlatitude atmospheric column, which results in less energetic baroclinic eddies and thus reduced meridional energy transport at midlatitudes. Upper-tropospheric BC also decreases the meridional temperature gradient on the equatorward flank of the tropospheric jet and yields a weakening and poleward shift of the jet, while boundary layer BC has no significant influence on the large-scale circulation since most of the heating is diffused by turbulence in the boundary layer. The effectiveness of BC in altering circulation generally increases with height. Dry baroclinic eddy theories can explain most of the extratropical response to free-tropospheric BC. Specifically, the decrease in vertical eddy heat flux related to a more stable atmosphere is the main mechanism for reestablishing atmospheric energy balance in the presence of BC-induced heating. Similar temperature responses are found in a dry idealized model, which further confirms the dominant role of baroclinic eddies in driving the extratropical circulation changes. The strong atmospheric-only response to BC suggests that absorbing aerosols are capable of altering synoptic-scale weather patterns. Its height dependence highlights the importance of better constraining model-simulated aerosol vertical distributions with satellite and field measurements. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111434
Appears in Collections: 气候减缓与适应
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作者单位: Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
Recommended Citation:
Shen Z.,Ming Y.. The influence of aerosol absorption on the extratropical circulation[J]. Journal of Climate,2018-01-01,31(15)