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Deteriorating haze situation and the severe haze episode during December 18-25 of 2013 in Xi'an, China, the worst event on record
Liu, Xiaodong1,2; Hui, Ying1,3; Yin, Zhi-Yong4; Wang, Zhaosheng1,3; Xie, Xiaoning1; Fang, Jiangang5
2016-07-01
Source PublicationTHEORETICAL AND APPLIED CLIMATOLOGY
Volume125Issue:1-2Pages:321-335
SubtypeArticle
AbstractFrequent occurrence of haze weather has been considered an urgent environmental problem in China and has attracted much attention worldwide in recent years. In this study, we examined the trend in the occurrence of haze days based on horizontal visibility in Xi'an, a major city in central China, since 2000. There were 49 haze days per year on average in Xi'an during 2000-2013, and the number of haze days has increased significantly since 2008, reaching 102 days in 2013. December is the month of the highest frequency of occurrence. During December 18-25 of 2013, the longest-lasting and most severe haze event in the recent decades occurred. The 8-day mean visibility in Xi'an was only 2.5 km with 5 days below 2 km. The mean air quality index in Xi'an during this period was 486.5, and in four of those days, it reached or exceeded the index's upper limit of 500. The exceptionally high level of PM2.5 concentration was inferred as the main reason of this severe haze episode. The local weather conditions were characterized by weak winds, enhanced atmospheric stability, and high relative humidity. Strong mid-tropospheric zonal flows in combination with weakened East Asian winter monsoon limited the cold air invasion from the higher latitudes, creating a condition of low pressure gradients in the lower troposphere and near the surface for a large region in central and eastern China. With high background emission levels, the suppressed dispersion of air pollutants eventually caused this severe haze episode affecting a large region in China.
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s00704-015-1509-8
WOS KeywordASIAN WINTER MONSOON ; PEARL RIVER-DELTA ; REGIONAL HAZE ; CHEMICAL CHARACTERISTICS ; AEROSOL CHARACTERISTICS ; ATMOSPHERIC AEROSOLS ; POLLUTION EPISODE ; RELATIVE-HUMIDITY ; PM2.5 ; VISIBILITY
Indexed BySCI
Language英语
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000378884600025
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5723
Collection古环境研究室
Affiliation1.Chinese Acad Sci, Inst Earth Environm, SKLLQG, 97 Yanxiang Rd, Xian 710075, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ San Diego, Environm & Ocean Sci, San Diego, CA 92110 USA
5.Climate Ctr Shaanxi Prov, Xian 710014, Peoples R China
Recommended Citation
GB/T 7714
Liu, Xiaodong,Hui, Ying,Yin, Zhi-Yong,et al. Deteriorating haze situation and the severe haze episode during December 18-25 of 2013 in Xi'an, China, the worst event on record[J]. THEORETICAL AND APPLIED CLIMATOLOGY,2016,125(1-2):321-335.
APA Liu, Xiaodong,Hui, Ying,Yin, Zhi-Yong,Wang, Zhaosheng,Xie, Xiaoning,&Fang, Jiangang.(2016).Deteriorating haze situation and the severe haze episode during December 18-25 of 2013 in Xi'an, China, the worst event on record.THEORETICAL AND APPLIED CLIMATOLOGY,125(1-2),321-335.
MLA Liu, Xiaodong,et al."Deteriorating haze situation and the severe haze episode during December 18-25 of 2013 in Xi'an, China, the worst event on record".THEORETICAL AND APPLIED CLIMATOLOGY 125.1-2(2016):321-335.
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