Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-1203-2018 |
Transport of regional pollutants through a remote trans-Himalayan valley in Nepal | |
Dhungel, Shradda1; Kathayat, Bhogendra2; Mahata, Khadak3; Panday, Arnico1,4 | |
2018-01-30 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:2页码:1203-1216 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Nepal; Germany |
英文摘要 | Anthropogenic emissions from the combustion of fossil fuels and biomass in Asia have increased in recent years. High concentrations of reactive trace gases and light-absorbing and light-scattering particles from these sources form persistent haze layers, also known as atmospheric brown clouds, over the Indo-Gangetic plains (IGP) from December through early June. Models and satellite imagery suggest that strong wind systems within deep Himalayan valleys are major pathways by which pollutants from the IGP are transported to the higher Himalaya. However, observational evidence of the transport of polluted air masses through Himalayan valleys has been lacking to date. To evaluate this pathway, we measured black carbon (BC), ozone (O-3), and associated meteorological conditions within the Kali Gandaki Valley (KGV), Nepal, from January 2013 to July 2015. BC and O-3 varied over both diurnal and seasonal cycles. Relative to nighttime, mean BC and O-3 concentrations within the valley were higher during daytime when the up-valley flow (average velocity of 17 m s(-1)) dominated. BC and O-3 concentrations also varied seasonally with minima during the monsoon season (July to September). Concentrations of both species subsequently increased post-monsoon and peaked during March to May. Average concentrations for O3 during the seasonally representative months of April, August, and November were 41.7, 24.5, and 29.4 ppbv, respectively, while the corresponding BC concentrations were 1.17, 0.24, and 1.01 mu g m(-3), respectively. Up-valley fluxes of BC were significantly greater than down-valley fluxes during all seasons. In addition, frequent episodes of BC concentrations 2-3 times higher than average persisted from several days to a week during non-monsoon months. Our observations of increases in BC concentration and fluxes in the valley, particularly during pre-monsoon, provide evidence that trans-Himalayan valleys are important conduits for transport of pollutants from the IGP to the higher Himalaya. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423723500004 |
WOS关键词 | ATMOSPHERIC BROWN CLOUDS ; CARBON MASS CONCENTRATION ; HIGH BLACK CARBON ; TIBETAN PLATEAU ; HYDROLOGICAL CYCLE ; OPTICAL-PROPERTIES ; BOUNDARY-LAYER ; MANORA PEAK ; AEROSOLS ; CLIMATE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19452 |
专题 | 地球科学 |
作者单位 | 1.Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA; 2.Nepal Wireless, Shanti Marg, Pokhara 33700, Nepal; 3.Inst Adv Sustainabil Studies, D-14467 Potsdam, Germany; 4.Int Ctr Integrated Mt Dev, Kathmandu 44700, Nepal |
推荐引用方式 GB/T 7714 | Dhungel, Shradda,Kathayat, Bhogendra,Mahata, Khadak,et al. Transport of regional pollutants through a remote trans-Himalayan valley in Nepal[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(2):1203-1216. |
APA | Dhungel, Shradda,Kathayat, Bhogendra,Mahata, Khadak,&Panday, Arnico.(2018).Transport of regional pollutants through a remote trans-Himalayan valley in Nepal.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(2),1203-1216. |
MLA | Dhungel, Shradda,et al."Transport of regional pollutants through a remote trans-Himalayan valley in Nepal".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.2(2018):1203-1216. |
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