DOI: 10.1016/j.atmosenv.2014.08.031
Scopus记录号: 2-s2.0-84908001597
论文题名: SO2 measurements at a high altitude site in the central Himalayas: Role of regional transport
作者: Naja M ; , Mallik C ; , Sarangi T ; , Sheel V ; , Lal S
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 99 起始页码: 392
结束页码: 402
语种: 英语
英文关键词: Boundary layer
; Free troposphere
; NOy
; Sulfur dioxide
; Transport
Scopus关键词: Sulfur dioxide
; Free troposphere
; High altitude sites
; Himalayas
; Regional transport
; Transport
; Boundary layers
; coal
; sulfur dioxide
; air mass
; altitude
; anthropogenic source
; atmospheric pollution
; boundary layer
; nitrogen oxides
; point source pollution
; pollutant transport
; sulfur dioxide
; troposphere
; altitude
; Article
; climate
; India
; measurement
; night
; Pakistan
; pollution transport
; troposphere
; wind
; winter
; Gangetic Plain
; Himalayas
; India
; India
; Nainital
; Pakistan
; Uttarakhand
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: Continuous measurements of a climatically important acidic gas, SO2, were made over Nainital (29.37°N, 79.45°E; 1958mamsl), a regionally representative site in the central Himalayas, for the first time during 2009-2011. Unlike many other sites, the SO2 levels over Nainital are higher during pre-monsoon (345pptv) compared to winter (71pptv). High values during pre-monsoon are attributed to the transport of air masses from regions viz. Indo-Gangetic Plain (IGP), northern India and north-East Pakistan, which are dotted with numerous industries and power plants, where coal burning occurs. Transport from the polluted regions is evinced from good correlations of SO2 with wind speed, NOy and UV aerosol index during these periods. Daytime elevations in SO2 levels, influenced by 'valley winds' and boundary layer evolution, is a persistent feature at Nainital. SO2 levels are very much lower during monsoon compared to pre-monsoon, due to oxidation losses and wet scavenging. Despite this, SO2NOy slopes are high (>0.4) both during pre-monsoon and monsoon, indicating impacts of point sources. The SO2 levels during winter are lower as the measurement site is cut off from the plains due to boundary layer dynamics. Further, the SO2 levels during winter nights are the lowest (lesser than 50pptv) and resemble free tropospheric conditions. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80512
Appears in Collections: 气候变化事实与影响
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作者单位: Aryabhatta Research Institute of Observational Sciences, Nainital, India; Space and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad, India
Recommended Citation:
Naja M,, Mallik C,, Sarangi T,et al. SO2 measurements at a high altitude site in the central Himalayas: Role of regional transport[J]. Atmospheric Environment,2014-01-01,99