Two winter PM2.5 pollution types and the causes in the city clusters of Sichuan Basin, Western China
刊物全称
Science of the Total Environment
论文作者
Suping Zhao,Ye Yu,Daiying Yin,Dahe Qin,Jianjun He,Jianglin Li,Longxiang Dong
发表年度
2018
刊物类别
SCI
卷
636
期
1228-1240
影响因子
4.984
通讯作者
Zhao, SP
请求全文
关键词
Sichuan Basin, PM2.5, Air quality, Meteorology
摘要
PM2.5 pollution types were analyzed and the causes were uncovered in Sichuan Basin using PM2.5 data from Chinese Ministry of Environmental Protection (MEP) and multiple meteorology data during January 2015 to February 2017. The events that PM2.5 increased gradually in the periods longer than 10 days and then decreased sharply were defined as "Type I", while the symmetrical variations of PM2.5 during increasing and decreasing periods were defined as "Type II" of PM2.5 pollution. Five cases of Type I and two cases of Type II were identified during the study period inside the basin. The increasing rates were almost comparable between the two PM2.5 pollution types with the range from 4 mu g m(-3) d(-1) to 8 mu g m(-3) d(-1), while the decreasing rates of Type I were between 25 mu g m(-3) d(-1) and 40 mu g m(-3) d(-1), which were 3-5 times higher than those of Type II (similar to 8 mu g m(-3) d(-1)). The rapid reduction of PM2.5 for Type I was mainly related to improvement of vertical and horizontal diffusion conditions induced by invasion of cold air masses, while slowly decreased PM2.5 for Type II was due largely to elevated horizontal wind speeds and shifted wind directions in the city clusters of the basin. (C) 2018 Elsevier B.V. All rights reserved.
- 上一条: Source apportionment of soil-contamination in Baotou City (North China) based on a combined magnetic and geochemical approach 2018-10-11
- 下一条: Spatial patterns and temporal variations of six criteria air pollutants during 2015 to 2017 in the city clusters of Sichuan Basin, China 2018-10-11
- Spatial patterns and temporal variations of six criteria air pollutants during 2015 to 2017 in the city clusters of Sichuan Basin, China 2018-10-11
- Effective Density of Submicron Aerosol Particles in a Typical Valley City, Western China 2018-10-11
- From highly polluted inland city of China to "Lanzhou Blue": The air-pollution characteristics 2018-10-11
- Land-atmospheric water and energy cycle of winter wheat,Loess Plateau,China 2018-10-11
- Numerical simulation of the impact of reforestation on winter meteorology and environment in a semi-arid urban valley, Northwestern China 2018-10-11