Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-11949-2018 |
Variations in surface ozone and carbon monoxide in the Kathmandu Valley and surrounding broader regions during SusKat-ABC field campaign: role of local and regional sources | |
Bhardwaj, Piyush1,2,7; Naja, Manish1; Rupakheti, Maheswar3; Lupascu, Aurelia3; Mues, Andrea3; Panday, Arnico Kumar4; Kumar, Rajesh5; Mahata, Khadak Singh3; Lal, Shyam6; Chandola, Harish C.2; Lawrence, Mark G.3 | |
2018-08-21 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:16页码:11949-11971 |
文章类型 | Article |
语种 | 英语 |
国家 | India; Germany; Nepal; USA; South Korea |
英文摘要 | Air pollution resulting from rapid urbanization and associated human activities in the Kathmandu Valley of Nepal has been leading to serious public health concerns over the past 2 decades. These concerns led to a multinational field campaign SusKat-ABC (Sustainable atmosphere for the Kathmandu Valley -Atmospheric Brown Clouds) that measured different trace gases, aerosols and meteorological parameters in the Kathmandu Valley and surrounding regions during December 2012 to June 2013 to understand local-to regional-scale processes influencing air quality of the Kathmandu Valley. This study provides information about the regional distribution of ozone and some precursor gases using simultaneous in situ measurements from a SusKat-ABC supersite at Bode, Nepal, and two Indian sites: a high-altitude site, Nainital, located in the central Himalayan region and a low-altitude site, Pantnagar, located in the Indo-Gangetic Plain (IGP). The diurnal variations at Bode showed a daytime buildup in O-3 while CO shows morning and evening peaks. Similar variations (with lower levels) were also observed at Pantnagar but not at Nainital. Several events of hourly ozone levels exceeding 80 ppbv were also observed at Bode. The CO levels showed a decrease from their peak level of about 2000 ppbv in January to about 680 ppbv in June at Bode. The hourly mean ozone and CO levels showed a strong negative correlation during winter (r(2) = 0.82 in January and r(2) = 0.71 in February), but this negative correlation gradually becomes weaker, with the lowest value in May (r(2) = 0.12). The background O-3 and CO mixing ratios at Bode were estimated to be about 14 and 325 ppbv, respectively. The rate of change of ozone at Bode showed a more rapid increase (similar to 17 ppbv h(-1)) during morning than the decrease in the evening (5-6 ppbv h(-1)), suggesting the prevalence of a semi-urban environ. The lower CO levels during spring suggest that regional transport also contributes appreciably to springtime ozone enhancement in the Kathmandu Valley on top of the local in situ ozone production. We show that regional pollution resulting from agricultural crop residue burning in northwestern IGP led to simultaneous increases in O-3 and CO levels at Bode and Nainital during the first week of May 2013. A biomass-burning-induced increase in ozone and related gases was also confirmed by a global model and balloon-borne observations over Nainital. A comparison of surface ozone variations and composition of light non-methane hydrocarbons among different sites indicated the differences in emission sources of the Kathmandu Valley and the IGP. These results highlight that it is important to consider regional sources in air quality management of the Kathmandu Valley. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442245300004 |
WOS关键词 | BLACK CARBON ; AIR-QUALITY ; URBAN SITE ; METEOROLOGICAL PARAMETERS ; SEASONAL-VARIATIONS ; TROPOSPHERIC OZONE ; PREMONSOON AIR ; RURAL SITE ; EMISSIONS ; CO |
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/16186 |
专题 | 地球科学 |
作者单位 | 1.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, India; 2.Kumaun Univ, Dept Phys, DSB Campus, Naini Tal 263001, India; 3.IASS, D-14467 Potsdam, Germany; 4.Int Ctr Integrated Mt Dev ICIMOD, Kathmandu 44700, Nepal; 5.Natl Ctr Atmospher Res NCAR Boulder, Boulder, CO 80301 USA; 6.PRL, Ahmadabad 380009, Gujarat, India; 7.GIST, Gwangju 61005, South Korea |
推荐引用方式 GB/T 7714 | Bhardwaj, Piyush,Naja, Manish,Rupakheti, Maheswar,et al. Variations in surface ozone and carbon monoxide in the Kathmandu Valley and surrounding broader regions during SusKat-ABC field campaign: role of local and regional sources[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(16):11949-11971. |
APA | Bhardwaj, Piyush.,Naja, Manish.,Rupakheti, Maheswar.,Lupascu, Aurelia.,Mues, Andrea.,...&Lawrence, Mark G..(2018).Variations in surface ozone and carbon monoxide in the Kathmandu Valley and surrounding broader regions during SusKat-ABC field campaign: role of local and regional sources.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(16),11949-11971. |
MLA | Bhardwaj, Piyush,et al."Variations in surface ozone and carbon monoxide in the Kathmandu Valley and surrounding broader regions during SusKat-ABC field campaign: role of local and regional sources".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.16(2018):11949-11971. |
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