气候变化领域集成服务门户(CCPortal): Water-Soluble Ionic Composition of Aerosols at Urban Location in the Foothills of Himalaya, Pokhara Valley, Nepal

CCPortal

DOI	10.3390/atmos7080102
	Water-Soluble Ionic Composition of Aerosols at Urban Location in the Foothills of Himalaya, Pokhara Valley, Nepal
	Tripathee, Lekhendra; Kang, Shichang; Rupakheti, Dipesh; Zhang, Qianggong; Huang, Jie; Sillanpaa, Mika
发表日期	2016
ISSN	2073-4433
卷号	7 期号:8
英文摘要	The total suspended particulate (TSP) samples were collected from April 2013 to April 2014 at the urban location of Pokhara valley in western Nepal. The major aims were to study, quantify, and understand the concentrations and variations of TSP and major water-soluble inorganic ions (WSIIs) in the valley with limited data. The annual average TSP mass concentration was 135.50 +/- 62.91 mu g/m(3). The average analyzed total WSIIs accounted for 14.4% of total TSP mass. Major anions and cations in TSP samples were SO42- and Ca2+, respectively. Seasonal differences in atmospheric conditions explain the clear seasonal variations of ions, with higher concentrations during pre-monsoon and winter and lower concentrations during the monsoon period. Neutralization factor calculations suggested that Ca2+ in the Pokhara valley mostly neutralizes the acidity in the atmosphere. Principle component analysis, NO3- / SO42- ratio, and non-sea salt fraction calculations suggested that the WSIIs in the valley were mostly derived from anthropogenic activities and crustal mineral dust, which was also supported by the results from precipitation chemistry over the central Himalayas, Nepal. In addition, back trajectories analysis has suggested that the air pollution transported from and through Indo-Gangetic Plains (IGP) during the dry periods, which has resulted in high ionic loadings during this period. Average NO3- / SO42- ratio was found to be 0.69, indicating the dominance of stationary sources of TSP in Pokhara valley. Secondary inorganic aerosols can have an adverse health impact on the human population in the valley. The data set from this one-year study provides new insights into the composition of WSIIs in the foothills of the Himalayas, which can be of great importance for understanding the atmospheric environment in the region.
关键词	TSP water-soluble inorganic ions source monsoon anthropogenic aerosols Nepal
学科领域	Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
来源期刊	ATMOSPHERE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111835
作者单位	Chinese Acad Sci, State Key Lab Cryospher Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Tripathee, Lekhendra,Kang, Shichang,Rupakheti, Dipesh,et al. Water-Soluble Ionic Composition of Aerosols at Urban Location in the Foothills of Himalaya, Pokhara Valley, Nepal[J]. 中国科学院西北生态环境资源研究院,2016,7(8).
APA	Tripathee, Lekhendra,Kang, Shichang,Rupakheti, Dipesh,Zhang, Qianggong,Huang, Jie,&Sillanpaa, Mika.(2016).Water-Soluble Ionic Composition of Aerosols at Urban Location in the Foothills of Himalaya, Pokhara Valley, Nepal.ATMOSPHERE,7(8).
MLA	Tripathee, Lekhendra,et al."Water-Soluble Ionic Composition of Aerosols at Urban Location in the Foothills of Himalaya, Pokhara Valley, Nepal".ATMOSPHERE 7.8(2016).