DOI: 10.1175/JCLI-D-15-0388.1
Scopus记录号: 2-s2.0-84959566763
论文题名: Does humidity's seasonal cycle affect the annual-mean tropical precipitation response to sulfate aerosol forcing?
作者: Merlis T.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 4 起始页码: 1451
结束页码: 1460
语种: 英语
Scopus关键词: Aerosols
; Atmospheric radiation
; Budget control
; Climate models
; Climatology
; Earth atmosphere
; Sulfur compounds
; Tropics
; Annual mean precipitation
; Atmospheric circulation
; Atmospheric energy
; Atmospheric general circulation models
; Atmospheric reanalysis
; Climate model simulations
; Meridional circulation
; Tropical precipitation
; Atmospheric humidity
; aerosol
; atmospheric circulation
; atmospheric general circulation model
; climate modeling
; climatology
; humidity
; precipitation assessment
; radiative forcing
; seasonality
; sulfate
英文摘要: Sulfate aerosol radiative forcing alters the distribution of tropical precipitation in climate model simulations. The annual-mean tropical precipitation change is typically described as arising from an annual-mean change in the mean atmospheric circulation. However, the seasonality of the climatology of tropical humidity may modulate the annual-mean precipitation response. Here, the role of seasonality of tropical humidity is assessed using reanalysis and idealized atmospheric general circulation model (GCM) simulations perturbed by sulfate aerosol radiative forcing. When coupled to an aquaplanet slab ocean with low thermal inertia, the seasonal cycle in GCM simulations of the "continental" regime is large and the annual-mean precipitation change depends on both the seasonally varying perturbation mean meridional circulation and the seasonally varying climatological specific humidity. When coupled to an aquaplanet slab ocean with a higher thermal inertia, the seasonal cycle in GCM simulations of the "oceanic" regime is smaller and the annual-mean precipitation change can be approximated by considering the perturbation convergence of the water vapor flux of the annual-mean perturbation mean meridional circulation and the annual-mean climatological specific humidity. The results of the aquaplanet simulations taken together with the magnitude of the seasonality of humidity in an atmospheric reanalysis suggest that the simplest forms of energetic arguments for the tropical precipitation response to perturbations in the atmospheric energy budget, which neglect an explicit role for the seasonality of the radiative forcing and the climatological specific humidity, are not quantitatively accurate for Earth's tropical land regions. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50200
Appears in Collections: 气候变化事实与影响
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作者单位: McGill University, Montreal, QC, Canada
Recommended Citation:
Merlis T.M.. Does humidity's seasonal cycle affect the annual-mean tropical precipitation response to sulfate aerosol forcing?[J]. Journal of Climate,2016-01-01,29(4)