DOI: 10.1002/jgrd.50298
论文题名: GCM simulations of anthropogenic aerosol-induced changes in aerosol extinction, atmospheric heating and precipitation over India
作者: Cherian R. ; Venkataraman C. ; Quaas J. ; Ramachandran S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 7 起始页码: 2938
结束页码: 2955
语种: 英语
Scopus关键词: Atmospheric aerosols
; Atmospheric thermodynamics
; Computer simulation
; Radiometers
; Satellite imagery
; Sun
; Weather forecasting
; Aerosol indirect effect
; Aerosol optical depths
; Anthropogenic emissions
; Convective precipitation
; General circulation model
; Moderate resolution imaging spectroradiometer
; Monsoon precipitation
; Surface solar radiation
; Precipitation (meteorology)
; aerosol property
; anthropogenic source
; Aqua (satellite)
; atmospheric convection
; clear sky
; cloud droplet
; extinction coefficient
; general circulation model
; heating
; hydrological cycle
; MODIS
; monsoon
; precipitation (climatology)
; regional climate
; satellite imagery
; seasonal variation
; solar radiation
; spatial distribution
; Terra (satellite)
; trend analysis
; troposphere
; weather forecasting
; India
英文摘要: The influence of anthropogenic emissions on aerosol distributions and the hydrological cycle are examined with a focus on monsoon precipitation over the Indian subcontinent, during January 2001 to December 2005, using the European Centre for Medium-Range Weather Forecasts-Hamburg (ECHAM5.5) general circulation model extended by the Hamburg Aerosol Module (HAM). The seasonal variability of aerosol optical depth (AOD) retrieved from the MODerate Resolution Imaging Spectroradiometer (MODIS) on board the Terra and Aqua satellite is broadly well simulated (R≈0.6-0.85) by the model. The spatial distribution and seasonal cycle of the precipitation observed over the Indian region are reasonably well simulated (R≈0.5 to 0.8) by the model, while in terms of absolute magnitude, the model underestimates precipitation, in particular in the south-west (SW) monsoon season. The model simulates significant anthropogenic aerosol-induced changes in clear-sky net surface solar radiation (dimming greater than -7 W m-2), which agrees well with the observed trends over the Indian region. A statistically significant decreasing precipitation trend is simulated only for the SWmonsoon season over the central-north Indian region, which is consistent with the observed seasonal trend over the Indian region. In the model, this decrease results from a reduction in convective precipitation, where there is an increase in stratiform cloud droplet number concentration (CDNC) and solar dimming that resulted from increased stability and reduced evaporation. Similarities in spatial patterns suggest that surface cooling, mainly by the aerosol indirect effect, is responsible for this reduction in convective activity. When changes in large-scale dynamics are allowed by slightly disturbing the initial state of the atmosphere, aerosol absorption in addition leads to a further stabilization of the lower troposphere, further reducing convective precipitation. © 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/63824
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: Department of Chemical Engineering, Indian Institute of Technology Bombay, Mumbai, India; Max Planck Institute for Meteorology, Hamburg, Germany; Physical Research Laboratory, Ahmedabad, India; Institute for Meteorology, Universität Leipzig, Stephanstr. 3, D-04103 Leipzig, Germany
Recommended Citation:
Cherian R.,Venkataraman C.,Quaas J.,et al. GCM simulations of anthropogenic aerosol-induced changes in aerosol extinction, atmospheric heating and precipitation over India[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)