新北区典型大气污染过程模拟及特征分析

Simulation and Characteristic Analysis of Typical Air Pollution Process in Xinbei District

基于新北区2018~2020年大气国控站点监测数据,利用特征雷达图和后向轨迹模型对典型大气污染过程进行过程模拟及特征分析。结果表明,三年来新北区空气质量优良率逐步提升,大气污染在不同区域呈现不同特征,除秋冬季重污染天气外,夏季亦常现重污染;筛选典型污染过程样本,特征雷达图分析污染以偏二次型为主,结合后向轨迹模拟可得新北区大气长期污染过程及疫情静默时期的污染均受到PM2.5远距离输送的影响,区域城市联防联控将是一场持久战。

Based on the monitoring data of national air control stations in Xinbei district from 2018 to 2020,the process simulation and characteristic analysis of typical air pollution processes were carried out bycharacteristic radar charts and backward trajectory models.The results showed that the excellent rate of air quality in Xinbei district had gradually increased in the past three years,and air pollution presented different characteristics in different regions.In addition to the heavily polluted weather in autumn and winter,heavy pollution often occured in summer;screening typical contamination process samples,and the characteristic radar map analysis showed that the pollution was mainly partial quadratic.Combined with the backward trajectory simulation,it can be concluded that the long-term atmospheric pollution process in Xinbei district and the pollution in the silent period of the epidemic were all affected by the long-distance transmission of PM2.5,and the joint prevention and control of regional cities would be a protracted war.