摘要
为研究重庆市区大气能见度变化特征，对2000～2005年的重庆能见度观测资料进行了统计分析。结果表明：市区能见度以差和较差为主，能见度的季节变化、日变化特征明显，且近年来日平均能见度有所下降。能见度与同期的地面气象条件、主要空气污染物的相关分析结果表明，在气象条件中，相对湿度和风速对能见度的影响最为明显，各季能见度均与相对湿度呈显著负相关，与地面风速呈正相关；在污染物因子中，PM10是能见度下降的最主要原因，且不同季节PMt0对能见度的影响程度不同，其中以冬、夏季影响较强。
Based on statistical analysis of atmospheric visibility observation data from 2000 to 2005 in Chongqing, the characteristics of atmospheric visibility were analyzed. The results showed that the visibility was mainly in poor condition and its seasonal and daily variations were obvious. Furthermore, the mean daily visibility declined with a little extent during recent years. Correlation analysis indicated that relative humidity and surface wind velocity were the main controlling factors to atmospheric visibility among meteorological factors. The visibility had significantly negative correlation with relative humidity in each season, while it had positive correlation with surface wind velocity. On the other hand, PM10 was the main cause of visibility degradation among pollution factors. Its influence on visibility degradation varied with the season and was relatively strong in winter and summer.
出处
《气象与环境学报》
2006年第6期6-10,共5页
Journal of Meteorology and Environment
关键词
能见度
气象条件
PM10污染
影响因素
Visibility
Meteorological condition
PM10 pollution
Controlling factors
