DOI: 10.1016/j.atmosenv.2014.09.034
Scopus记录号: 2-s2.0-84907806954
论文题名: Observations of black carbon induced semi direct effect over Northeast India
作者: Panicker A ; S ; , Pandithurai G ; , Safai P ; D ; , Dipu S ; , Prabha T ; V ; , Konwar M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 98 起始页码: 685
结束页码: 692
语种: 英语
英文关键词: Black carbon
; Cloud burning effect
; Heating rates
; Liquid water content
Scopus关键词: Black carbon
; Burning effects
; Liquid water content
; Northeast india
; Heating rate
; black carbon
; air mass
; aircraft
; atmospheric pollution
; black carbon
; cloud microphysics
; heating
; radiative forcing
; water content
; aerosol
; air pollution
; aircraft
; Article
; atmospheric dispersion
; cloud
; cloud burning
; cloud fraction
; cloud liquid water content
; combustion
; controlled study
; environmental parameters
; heating
; India
; liquid
; model
; precipitation
; radiative forcing
; warming
; water content
; Assam
; Gauhati
; India
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This article reports observational evidence of Black Carbon (BC) induced cloud burning effect (Semi direct effect) for the first time over a mountainous location in North east India. Simultaneous aircraft observations of Black Carbon (BC) mass concentrations and cloud microphysical parameters were carried out over Guwahati, in Northeast India during Cloud Aerosol Interactions and Precipitation Enhancement Experiment (CAIPEEX) Phase-I in 2009. Elevated pollution layers of BC (concentration exceeding 1μgm-3) were observed over the site up to 7km on different experimental days (August 30, September 4 and 6 in 2009) in the cloud regime. The vertical heating rate and radiative forcing induced by elevated BC layers in the cloud regime were estimated using an optical model along with a radiative transfer model. The instantaneous vertical heating rate induced by BC in cloud layers is found to be as high as 2.65K/day. The instantaneous vertical heating by BC is found to be inducing a significant reduction in the measured cloud liquid water content (LWC) over the site. Subsequently, the BC stimulated heating has been found to be reducing the cloud fraction (CFR) and thus inducing a "cloud burning effect (Semi direct effect)", over the region. The estimated instantaneous BC induced radiative forcing in the cloud regime is found to be+12.7-+45.1Wm-2 during the experimental periods. This large warming and reduction in cloudiness can decrease the precipitation over the region. However, more simultaneous BC-cloud observations and further research are necessary to establish a stable "semi-direct effect" over the region. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80518
Appears in Collections: 气候变化事实与影响
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作者单位: Indian Institute of Tropical Meteorology, Pune, India; Leipzig Institute for Meteorology, University of Leipzig, Vor dem Hospitaltore 1, Leipzig, Germany
Recommended Citation:
Panicker A,S,, Pandithurai G,et al. Observations of black carbon induced semi direct effect over Northeast India[J]. Atmospheric Environment,2014-01-01,98