DOI: 10.1002/2015GL065063
论文题名: Human-caused fires limit convection in tropical Africa: First temporal observations and attribution
作者: Tosca M.G. ; Diner D.J. ; Garay M.J. ; Kalashnikova O.V.
刊名: Geophysical Research Letters
ISSN: 0094-8617
EISSN: 1944-8348
出版年: 2015
卷: 42, 期: 15 起始页码: 6492
结束页码: 6501
语种: 英语
英文关键词: Africa
; anthropogenic
; biomass burning
; black carbon
; forest fires
; smoke
Scopus关键词: Aerosols
; Atmospheric aerosols
; Balloons
; Carbon
; Deforestation
; Feedback
; Smoke
; Africa
; Anthropogenic
; Biomass-burning
; Black carbon
; Forest fires
; Fires
; anthropogenic source
; atmospheric pollution
; biomass burning
; black carbon
; convective cloud
; emission
; forest fire
; meteorology
; observational method
; optical depth
; satellite imagery
; smoke
; tropical environment
; Africa
英文摘要: It is well established that smoke particles modify clouds, which in turn affects climate. However, no study has quantified the temporal dynamics of aerosol-cloud interactions with direct observations. Here for the first time, we use temporally offset satellite observations from northern Africa between 2006 and 2010 to quantitatively measure the effect of fire aerosols on convective cloud dynamics. We attribute a reduction in cloud fraction during periods of high aerosol optical depths to a smoke-driven inhibition of convection. We find that higher smoke burdens limit upward vertical motion, increase surface pressure, and increase low-level divergence - meteorological indicators of convective suppression. These results are corroborated by climate simulations that show a smoke-driven increase in regionally averaged shortwave tropospheric heating and decrease in convective precipitation during the fire season. Our results suggest that in tropical regions, anthropogenic fire initiates a positive feedback loop where increased aerosol emissions limit convection, dry the surface, and enable increased fire activity via human ignition. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940448515&doi=10.1002%2f2015GL065063&partnerID=40&md5=9ac628267e7a8697ebb976fe383a1244
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8233
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Tosca M.G.,Diner D.J.,Garay M.J.,et al. Human-caused fires limit convection in tropical Africa: First temporal observations and attribution[J]. Geophysical Research Letters,2015-01-01,42(15).