成都市大气颗粒污染物与气象要素的关系

通过对2004年成都市API指数及API>100日数百分数的再分析,探讨了大气颗粒物污染季节分布、区域分布状况与气象要素的相互关系,并尝试用因子分析法研究了污染物浓度年际变化与气象因子的关系。研究表明,大气污染的季节分布为冬季>春季>秋季>夏季;API>100时数百分数的季节变化状况为春季>冬季>秋季>夏季,区域分布为城西北>城东>城北>城中心>城东南>城西>城南。城市发展对风向的改变比较明显,对风速的改变不明显。大气颗粒污染物年际变化与气象因子的相关性研究表明,PM10浓度与SO2、NOX、湿度、气压呈正相关,与风速、蒸发量、温度呈负相关关系。

Relationships between Air Particle and Meteorological Elements in Chengdu

By the API index and the percentages of days about API>100 in the Chengdu,Sichuan Province,China in 2004,the relationships were discussed between air contaminant distribution in the different seasons and areas and the meteorological factors.More attention were paid to the relationships between concentration of the air particles and meteorological elements by means of factor analysis.The results were as follows:1) the atmosphere was polluted most seriously in Winter,Spring by the second,and then Autumn and Summer,and 2) the percentage of days about API>100 in seasons was the most in Spring,the second in Winter,and then Autumn and Summer,but the percentage in regions were more in the north-west,then the east,north,central,south-east,west and the south.Further research showed that the city development might have more obviously impact on the wind direction than on the wind speed.The positive correlation between the concentration of PM_(10) and the SO_2,NO_x,humidity,air pressure,and the negative correlation between the concentration of PM_(10) and the wind speed,evaporation capacity,temperature were displayed.