【摘要】 分析绵阳市城区2014～2016年空气污染个例,发现PM_{2. 5}污染日数最多,多发在秋冬季; PM₁₀污染多发在春季;O₃污染多在春夏季出现。按照划定的关键区进行天气学分型,结合气象要素和Pasquill稳定度综合分析。结果表明:PM_{2. 5}污染多发生在槽前型或高压控制型天气中,且绵阳地面主导风向为SE或NE时,更有利于污染发生,大气稳定度为D级; PM₁₀污染均发生在高压底部或前部型天气中,地面主导风向为SE或NE时,污染发生概率更高,大气稳定度多为D级; O₃污染绝大部分发生在经向型天气中,有时也发生在高压外围型和高压脊型的天气中,当地面主导风向为SE或SW时,有利于污染的发生,大气稳定度多为A-B级。更多还原

【Abstract】 By analyzing the air pollution cases in Mianyang city from 2014 to 2016,it is found that the number of pollution days are dominated by PM_{2. 5},which happened most frequently in autumn and winter; PM₁₀ pollution happened mostly in spring;and the pollution of ozone occurred mostly in spring and summer. According to the designated key areas,the synoptic classification was carried out,combined with the comprehensive analysis of meteorological elements and Pasquill stability. The results show that PM_{2. 5} pollution mostly occurs in trough-front or high-pressure controlled weather,and when the dominant wind direction of Mianyang is SE or NE,it is much more conducive to the pollution with the atmospheric stability of level D; PM₁₀ pollution occurs in high-pressure bottom or front-end weather,and when the dominant wind direction of the ground is SE or NE,the probability of pollution occurrence is higher with the atmospheric stability of level D; ozone pollution mostly occurs with the weather of longitude direction,when the dominant wind direction on the ground is SE or SW,it is conducive to the occurrence of pollution with mostly the atmospheric stability of level A-B.更多还原