摘要
根据桂林基准站1957～2006年的观测资料,对桂林市灰霾天气的年、季变化规律及与热岛效应的关系进行了分析。结果表明,桂林市年灰霾日数平均值为30d,80年代前年灰霾日数变化相对平稳,年平均值为8.6d,处于较低水平,80年代后灰霾日数年平均值为49d,比80年代前增加了40.4d,年平均灰霾日数呈明显的线性增长趋势;灰霾日数的月季变化表现为秋冬季多,春夏季少的分布特征,秋冬两个季节的灰霾日数占全年的76%;90年代后桂林出现热岛效应,第四季度尤为明显,与灰霾天气也大多出现在这个季节的分析结果一致。
According to the observation data of Guilin Meteorological Observatory from 1957 to 2006,the yearly variation and seasonal variation of haze weather and the relationship between haze and the heat island effect were analyzed.The results showe that the average annual haze days in Guilin is 30d.The number of haze days Changed relative stable before 1980＇s,and the annual number is 8.6d,at a low level.After the 1980＇s,the average annual number of haze days in Guilin is 49d,which obviously increases 40.4d in linear trends than that before 1980＇s.The monthly variation of haze days shows that haze happens mostly in autumn and winter and least in spring and summer,and the number of haze days in autumn and winter accounted for 76%.The heat island effect happened in 1990s in Guilin.And after the 1990s it was more obvious in the fourth quarter.It is consistent with the result that haze mostly happens in this quarter.
出处
《气象研究与应用》
2007年第4期20-21,25,共3页
Journal of Meteorological Research and Application
关键词
灰霾天气
气候特征
热岛效应
haze weather
Climatic Characteristics
heat island effect
