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Short-Term Weather Patterns Modulate Air Quality in Eastern China During 2015-2016 Winter

文献类型：期刊论文

作者Zhao, Shuyu1,3; Feng, Tian2,3; Tie, Xuexi1,3; Dai, Wenting1,3; Zhou, Jiamao1,3; Long, Xin1,3; Li, Guohui1,3; Cao, Junji1
刊名JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
出版日期2019-01-27
卷号124期号:2页码:986-1002
ISSN号2169-897X
DOI10.1029/2018JD029409
通讯作者Tie, Xuexi(tiexx@ieecas.cn)
英文摘要The roles of anthropogenic emissions and weather conditions in air pollution over eastern China have been widely discussed but still controversial. Here we focus on the impact of the intraseasonal variability of midtropospheric weather circulations on air quality during 2015-2016 winter. We use the European Center for Medium-Range Weather Forecasts reanalysis data to calculate westerly wind index (WI) and meridionality in the midtroposphere and also calculate the intensity of Siberian High at the surface. The results suggest that there were lower WI, higher meridionality, and strengthened Siberian High in January 2016 compared with the conditions in December 2015. Lower WI and higher meridionality imply for wavier midtropospheric weather circulations and stronger surface northerly winds, thereby causing more southward cold fresh air advection and resulting in the lower PM2.5 concentrations over eastern China in January 2016. Sensitivity experiments conducted by the Weather Research and Forecasting Chemical model show that the intraseasonal weather variability dominantly causes lower PM2.5 concentrations in January 2016. It not only counteracts increments in PM2.5 concentrations induced by the increased emission but also reduces PM2.5 concentrations by an extra 25-100g/m(3). We also simulate two extreme weather patterns and compare their effects on PM2.5 concentrations. Difference in these two weather patterns induces changes in PM2.5 concentrations by 50-200g/m(3) over eastern China and the maximal change exceeding 200g/m(3). These findings suggest that understanding the variability of the dominant midtropospheric circulation is the key to successfully forecasting short-term air quality over eastern China in winter. Plain Language Summary The subseasonal variation of PM2.5 concentrations is dominantly induced by the intraseasonal variability of weather circulations during 2015-2016 winter. In the early winter (December 2015), a straight westerly wind prevails at the midtroposphere, confining cold air within the high latitudes and causing the accumulation of PM2.5 concentrations in eastern China, while in the late winter (January 2016), a north-to-south oriented airflow at the midtroposphere allows cold air advection to eastern China, reducing PM2.5 concentrations. Consequently, the intraseasonal weather variability leads to the maximal reduction of PM2.5 concentrations by 50-200g/m(3). These findings suggest that understanding the variability of the midtroposphere circulation patterns is the key to successfully forecasting and improving air quality in winter.
WOS关键词ORGANIC AEROSOL CONCENTRATIONS ; PARTICULATE MATTER POLLUTION ; NORTH CHINA ; BLACK CARBON ; MEXICO-CITY ; ATMOSPHERIC CIRCULATIONS ; HAZE POLLUTION ; IMPACTS ; MODEL ; TRANSPORT
资助项目West Light Foundation of the Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC)[41430424] ; National Natural Science Foundation of China (NSFC)[41807307]
WOS研究方向Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000458845300031
出版者AMER GEOPHYSICAL UNION
资助机构West Light Foundation of the Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC)
源URL[http://ir.ieecas.cn/handle/361006/14298]  
专题地球环境研究所_粉尘与环境研究室
通讯作者Tie, Xuexi
作者单位1.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian, Shaanxi, Peoples R China
2.Xian AMS Ctr, Xian, Shaanxi, Peoples R China
3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Shuyu,Feng, Tian,Tie, Xuexi,et al. Short-Term Weather Patterns Modulate Air Quality in Eastern China During 2015-2016 Winter[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(2):986-1002.
APA Zhao, Shuyu.,Feng, Tian.,Tie, Xuexi.,Dai, Wenting.,Zhou, Jiamao.,...&Cao, Junji.(2019).Short-Term Weather Patterns Modulate Air Quality in Eastern China During 2015-2016 Winter.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(2),986-1002.
MLA Zhao, Shuyu,et al."Short-Term Weather Patterns Modulate Air Quality in Eastern China During 2015-2016 Winter".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.2(2019):986-1002.

入库方式： OAI收割

来源：地球环境研究所

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