Evaluation of regional transport of PM2.5 during severe atmospheric pollution episodes in the western Yangtze River Delta, China

2021 ◽  
Vol 293 ◽  
pp. 112827
Author(s):  
Ishaq Dimeji Sulaymon ◽  
Yuanxun Zhang ◽  
Jianlin Hu ◽  
Philip K. Hopke ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Atmospheric Pollution ◽  
Yangtze River ◽  
Yangtze River Delta ◽  
River Delta ◽  
Regional Transport ◽  
Pollution Episodes

scholarly journals Ozone affected by a succession of four landfall typhoons in the Yangtze River Delta, China: major processes and health impacts

2020 ◽  
Vol 20 (22) ◽  
pp. 13781-13799
Author(s):  
Chenchao Zhan ◽  
Min Xie ◽  
Chongwu Huang ◽  
Jane Liu ◽  
Tijian Wang ◽  
...  
Keyword(s):  
Yangtze River ◽  
Yangtze River Delta ◽  
Photochemical Reactions ◽  
River Delta ◽  
The Yangtze River ◽  
High Concentration ◽  
The Yrd ◽  
The Impact ◽  
The Yangtze River Delta ◽  
Pollution Episodes

Abstract. Landfall typhoons can significantly affect O3 in the Yangtze River Delta (YRD) region. In this study, we investigate a unique case characterized by two multiday regional O3 pollution episodes related to four successive landfall typhoons in the summer of 2018 in the YRD. The results show that O3 pollution episodes mainly occurred during the period from the end of a typhoon to the arrival of the next typhoon. The time when a typhoon reached the 24 h warning line and the time when the typhoon dies away in mainland China can be roughly regarded as time nodes. Meanwhile, the variations of O3 were related to the track, duration and landing intensity of the typhoons. The impact of typhoons on O3 was like a wave superimposed on the background of high O3 concentration in the YRD in summer. When a typhoon was near the 24 h warning line before it landed on the coastline of the YRD, the prevailing wind originally from the ocean changed to be from inland, and it transported lots of precursors from the polluted areas to the YRD. Under influences of the typhoon, the low temperature, strong upward airflows, more precipitation and wild wind hindered occurrences of high O3 episodes. After the passing of the typhoon, the air below the 700 hPa atmospheric layer was warm and dry, and the downward airflows resumed. The low troposphere was filed with high concentration of O3 due to O3-rich air transported from the low stratosphere and strong photochemical reactions. It is noteworthy that O3 was mainly generated in the middle of the boundary layer (∼ 1000 m) instead of at the surface. High O3 levels remained in the residual layer at night, and would be transported to the surface by downward airflows or turbulence by the second day. Moreover, O3 can be accumulated and trapped on the ground due to the poor diffusion conditions because the vertical diffusion and horizontal diffusion were suppressed by downward airflows and light wind, respectively. The premature deaths attributed to O3 exposure in the YRD during the study period were 194.0, more than the casualties caused directly by the typhoons. This work has enhanced our understanding of how landfall typhoons affect O3 in the YRD and thus can be useful in forecasting O3 pollution in regions strongly influenced by typhoon activities.

scholarly journals Characteristics of Atmospheric Compositions in the Background Area of Yangtze River Delta during Heavy Air Pollution Episode

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Hong-Hui Xu ◽  
Jing-Jiao Pu ◽  
Jun He ◽  
Jie Liu ◽  
Bing Qi ◽  
...  
Keyword(s):  
Air Pollution ◽  
Yangtze River ◽  
Temporal Trend ◽  
Yangtze River Delta ◽  
River Delta ◽  
Sampling Campaign ◽  
Haze Pollution ◽  
Formation And Evolution ◽  
Pollution Episodes ◽  
Background Area

In order to understand the formation and evolution of recurrent severe haze pollution episodes in Yangtze River Delta, China, a short comparative sampling campaign was conducted at the Lin’an background monitoring station from 25 November 2013 to 14 December 2013. The characteristic concentrations of PM2.5, black carbon, CO2, CO, and CH4have been systematically recorded at the abovementioned site. Coupled with detailed analysis of air backward trajectories, fire spot distribution surrounding the studied site and meteorological impacts, temporal trend, diurnal variation, and intercorrelation of the aforementioned species have also been comprehensively investigated throughout prehaze, haze, and posthaze periods.

Satellite-based estimation of hourly PM2.5 levels during heavy winter pollution episodes in the Yangtze River Delta, China

Chemosphere ◽  
2020 ◽  
Vol 239 ◽  
pp. 124678 ◽  
Author(s):  
Qiannan She ◽  
Myungje Choi ◽  
Jessica H. Belle ◽  
Qingyang Xiao ◽  
Jianzhao Bi ◽  
...  
Keyword(s):  
Yangtze River ◽  
Yangtze River Delta ◽  
River Delta ◽  
The Yangtze River ◽  
The Yangtze River Delta ◽  
Pollution Episodes
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