DOI: 10.1002/2013JD019860
论文题名: The effect of smoke emission amount on changes in cloud properties and precipitation: A case study of Canadian boreal wildfires of 2007
作者: Lu Z. ; Sokolik I.N.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11777
结束页码: 11793
语种: 英语
英文关键词: biomass burning smoke
; clouds
; precipitation
Scopus关键词: Atmospheric aerosols
; Clouds
; Fires
; Loading
; Physics
; Precipitation (chemical)
; Rain
; Snow
; Aerosol optical depths
; Biomass burning smokes
; Cloud microphysics
; Cloud-aerosol lidar and infrared pathfinder satellite observations
; Model experiments
; Moderate resolution imaging spectroradiometer
; Ozone monitoring instruments
; Vertical spatial distributions
; Smoke
; aerosol property
; algorithm
; cloud microphysics
; cloud water
; experimental study
; lidar
; optical depth
; smoke
; spatial distribution
; wildfire
; Canada
英文摘要: We investigate the influence of wildfire smoke aerosols on cloud microphysics and precipitation using a coupled aerosol-cloud microphysics-meteorology model WRF-Chem-SMOKE. The Wildfire Automated Biomass Burning Algorithm products are used to compute "online" hourly size- and composition-resolved smoke emission fluxes during Canadian boreal wildfires in the summer of 2007. Comparisons with Moderate Resolution Imaging Spectroradiometer aerosol optical depth, Ozone Monitoring Instrument aerosol index, and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation vertical feature mask demonstrate that WRF-Chem-SMOKE captures both the horizontal and vertical spatial distribution of smoke. However, estimated smoke emissions result in much lower aerosol optical depth values than those of observations (by about tenfold). Modeling experiments with varying amounts of smoke emissions of 5 to 10 times as high as the original load reveal that low smoke load favors the collision-coalescence process at a certain stage, leading to either positive or negative changes in the cloud water path (CWP) relative to smoke-free conditions. For high smoke emissions, changes in CWP are positive, as large as 0.5 kg/m2. A domain-integrated increase in CWP is proportional to smoke loading. By contrast, both positive and negative changes in the rain water path (RWP) and the snow water path (SWP) are found. While domain-integrated changes in RWP are negative, those in SWP go from negative to positive under a high smoke load. Higher smoke loadings suppress precipitation initially, because of smoke-induced reduction of the collision-coalescence and riming processes, but ultimately cause an invigoration of precipitation. We found that precipitation is highly sensitive to 3-D smoke fields and varies in a nonlinear manner with smoke loads. Key Points High smoke load increases cloud water path relative to smoke-free conditions Smoke can cause either positive or negative change in rain and snow water path Precipitation varies in a non-linear manner with smoke loads ©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/63209
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: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340, United States
Recommended Citation:
Lu Z.,Sokolik I.N.. The effect of smoke emission amount on changes in cloud properties and precipitation: A case study of Canadian boreal wildfires of 2007[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)