新都区冬季空气污染扩散与气象要素相关性研究

Correlation between Air Pollution Diffusion and Meteorological Elements in Xindu

利用2014~2018年冬季空气质量和污染物浓度数据,结合地面观测、探空及风廓线雷达资料,对新都区冬季气象要素及其污染扩散条件进行分析。结果表明:(1)新都区不同污染物具有相同的日变化特征,在11时左右浓度最高,18时达到最低。(2)新都区污染物浓度与风速、气温、降水、相对湿度有密切关系。当风速大于(小于)平均风速时,污染物浓度减小(增加);气温越高且相对湿度越大,污染也越强;降水较弱时,反而会加重污染。(3)新都区污染天气过程中,逆温强度与厚度的大小将影响污染物的垂直扩散,强度和厚度偏大,污染偏严重。

Based on the winter air quality and pollutant concentration data from 2014 to 2018,combined with ground observation,sounding and wind profile radar data,the winter meteorological elements and their pollution diffusion conditions in Xindu District were analyzed.The results show that:(1)Different pollutants in Xindu District had the same daily variation characteristics,and the concentration reached the highest around 11:00 am and the lowest at 18:00.(2)The pollutant concentration in Xindu District was closely related to wind speed,temperature,precipitation,and relative humidity.When the wind speed was greater(less)than the average wind speed,the pollutant concentration decreased(increased);the higher the temperature and the relative humidity were,the stronger the pollution would be;the weaker precipitation would aggravate the pollution instead.(3)In the process of polluted weather in Xindu District,the strength and thickness of inversion would affect the vertical diffusion of pollutants,when the intensity and thickness were too large,the pollution was serious.