空气污染气象指数在成都地区的适用性分析

Applicability Analysis of Air Pollution Weather Index in Chengdu Area

文章利用2014-2018年常规气象观测资料、多种再分析资料以及空气污染资料,对成都市空气质量和气象条件进行了初步分析,对描述水平和垂直方向上扩散条件的滞留指数、通风系数、综合二者构建的空气污染扩散指数以及基于后向轨迹模拟PSCF贡献因子构建的描述污染物输送的空气污染输送指数进行了计算分析,结论如下:成都冬半年的污染物浓度较高,尤其在冬季的1月、2月和12月,冬半年气象条件不利于污染物的扩散。滞留指数、通风系数以及空气污染扩散指数与PM2.5浓度均有一定的相关关系,空气污染扩散指数与PM2.5浓度相关系数为0.3031,高于滞留指数和通风系数的相关系数。四川盆地内部的气团对成都空气污染物的贡献较大,输送指数与成都PM2.5浓度存在极强的正相关关系,对成都地区的污染预报预警业务存在一定的指导意义。

In this paper,air pollution meteorological index calculated by meteorological observation data,air pollution data,various reanalysis data and potential source contribution function to describes the diffusion and transport of air pollution characteristics in Chengdu from 2014 to 2018.The results show that Chengdu has a higher pollutant concentration in the winter half year,meteorological conditions during the winter half year are not conducive to the spread of pollutants.The retention index,ventilation index and air pollution diffusion index have a certain correlation with PM2.5concentration.The correlation coefficient between air pollution diffusion index and PM2.5concentration is 0.3031,which is higher than the correlation coefficient between retention index and ventilation coefficient.The air mass inside the Sichuan Basin contributes a lot to the air pollutants in Chengdu,and there is a strong positive correlation between the air pollution transport index and the PM2.5concentration in Chengdu.