南宁市大气能见度变化特征及影响因子分析

Analysis on variation features of atmospheric visibility and its influencing factors in Nanning

对2000至2006年的南宁市能见度资料进行统计分析。分析表明,南宁市近7a能见度年均值在13～17km之间,总体呈下降趋势。一年之中,能见度最小值主要出现在1至3月,最大值出现在6至7月,汛期能见度明显好于非汛期。一日之中,能见度的日变化为：08时〈02时〈20时〈14时。能见度与气象因子的相关分析表明,能见度与温度、风速成正比,与压强、降水、湿度成反比。与污染物的相关分析表明,能见度与PM10浓度的相关性较强,达到-0.58。

In this paper,the visibility data of Nanning from 2000 to 2006 are statistical analyzed.The results showed that,the annual average of visibility which is between 13 and 17 in Nanning nearly 7 years has declined.The minimum visibility occurs primarily in Jan.to Mar,and the maximum visibility occurs primarily in Jun.to Jul.in a year.The visibility in flood season is obviously better than that in non-flood season.The daily variation of visibility is 08＇〈02＇〈20＇〈14＇.Correlation analysis between visibility and meteorological factors indicate that the visibility has positive correlation with temperature and wind velocity,while it has negative correlation with pressure,precipitation and relative humidity.Correlation analysis between visibility and pollutants indicate that the visibility has significantly negative correlation with PM10 concentration,and the relativity is -0.58.