YIN Lihao,ZHANG Xiaoling,FAN Jin,et al.Analysis of PM2.5 Transport Trajectory and Potential Source Areas in Five Cities in Northeast Sichuan[J].Journal of Chengdu University of Information Technology,2024,39(02):246-254.[doi:10.16836/j.cnki.jcuit.2024.02.017]
川东北五市PM2.5输送轨迹及潜在源区分析
- Title:
- Analysis of PM2.5 Transport Trajectory and Potential Source Areas in Five Cities in Northeast Sichuan
- 文章编号:
- 2096-1618(2024)02-0246-09
- Keywords:
- PM2.5; PSCF; CWT; backward trajectory; Northeast Sichuan
- 分类号:
- X513
- 文献标志码:
- A
- 摘要:
- 基于全球数据同化预报系统数据(GDAS)资料和气象数据,分析川东北五市广元、巴中、达州、南充和广安PM2.5的污染特征、传输途径和污染源分布。通过HYSPLIT后向轨迹模型模拟五市2015-2020年冬季(12-2月)的逐日48 h的气流后向轨迹,同时进行聚类分析,并使用潜在源贡献因子(PSCF)方法和浓度加权轨迹(CWT)方法识别川东北地区的PM2.5的潜在污染源区,分析PM2.5质量浓度的区域性污染特点及其输送特征。结果表明,研究期间川东北五市的污染物总体呈现下降趋势,其中PM2.5和PM10下降幅度较大, PM2.5污染最严重的季节出现在冬季。后向轨迹表明,五市的污染轨迹均以近距离输送为主。通过潜在源区分析表明广元的主要源区为巴中和南充,巴中的主要源区位于广元南部、南充北部及达州中部地区,达州的主要源区为巴中南部、南充的东南部及重庆的北部地区,南充的主要源区在广元南部、巴中南部、达州的中南部、广安及重庆的中西部和遂宁,广安的主要源区主要在达州中部、南充及重庆的中部地区。
- Abstract:
- Based on the Global Data Assimilation Forecasting System(GDAS)data and meteorological data, this paper analyzes the PM2.5 pollution characteristics, transmission routes and pollution sources distribution among five cities in northeastern Sichuan, Guangyuan, Bazhong, Dazhou, Nanchong and Guang’an. The 48 h daily airflow backward trajectories of five cities in the winter of 2015-2020(December to February)were simulated by the HYSPLIT backward trajectory model, and cluster analysis was performed at the same time, and the potential source contribution function(PSCF)method and the concentration weighted trajectory(CWT)analysis method identifies the potential pollution source areas of PM2.5 in northeastern Sichuan, and analyzes the regional pollution characteristics and transport characteristics of PM2.5 mass concentration. The results showed that during the study period, the pollutants in the five cities generally showed a downward trend, among which PM2.5 and PM10 decreased significantly, and the season with the most serious PM2.5 pollution occurred in winter. The backward trajectory shows that the pollution trajectories of the five cities are dominated by short-range transportation. The analysis of potential source areas shows that the main source areas of Guangyuan are Bazhong and Nanchong, the main source areas of Bazhong are located in the south of Guangyuan, the north of Nanchong and the central area of Dazhou, and the main source areas of Dazhou are the south of Bazhong and the southeast of Nanchong. The main source areas of Nanchong are in southern Guangyuan,southern Bazhong, central and southern Dazhou, Guang’an, and the central and western parts of Chongqing and Suining. The main source areas of Guang’an are mainly in central Dazhou,Nanchong and central Chongqing.
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备注/Memo
收稿日期:2022-07-29
通信作者:张小玲.E-mail:xlzhang@ium.cn