摘要
利用2004年乌鲁木齐城区(以天山区为例)PM10日平均浓度和气象要素观测资料,对不同季节PM10浓度变化特征、不同级别污染日数进行统计分析.同时,结合环境扫描电镜/X射线能谱(ESEM-EDX)对不同季节的颗粒物的形貌及来源进行了初步探讨。结果表明2004年PM10浓度变化为:冬季>秋季>春季>夏季;冬季出现4级以上污染日数最多,占39.5%;夏季最为洁净,好于2级的日数占到76.1%.PM10和气象因子的相关分析表明浓度与风速成正比,与降水成反比,与温度,相对湿度和逆温层厚度相关比较复杂,有时成正相关,有时呈负相关。颗粒物的形貌在不同季节特征明显,冬季颗粒物多呈圆球形,春季形貌不规则,夏季既有圆球形又有不规则形貌的颗粒,而秋季颗粒物多呈链状.
According to the average daily concentration of PM_(10) and meteorological observation elements at Tianshan District,Urumqi in 2004,the PM_(10) concentration in different seasons and days of different air polluted grade were statistically analysed.Meanwhile,a preliminary study to the morphology and source of particulate matter in various seasons were carried out by means of environment scan electron microscopy coupled with X-ray energy dispersion(ESEM-EDX).The results showed that the sequence of concentration variation of PM_(10) was winter,autumn,spring and summer.The percent of days of air polluted beyond grade Ⅳ in winter was 39.5%.In contrast,the average concentration in summer was the lowest.Its percentage better than grade Ⅱ could reach 76.1%.Analysis to correlation between PM_(10) concentration and meteorological factors displayed that the correlation coefficient was always positive between the concentrations and wind speed,but negative with precipitation,and uncertainty with temperature,relative humidity and height of temperature inversion.The micrographs of aerosol particles with round-flake shape in winter,irregular shape in spring,different shape in summer and fine chain in autumn were characterized.
出处
《城市环境与城市生态》
CAS
CSCD
2005年第6期16-18,共3页
Urban Environment & Urban Ecology
基金
新疆气象局资助项目资助
