近53年辽宁雾的时空分布及成因分析

Temporal and spatial distributions of the fogs and their formation conditions in Liaoning province during recent 53 years

利用1951-2003年辽宁12个代表站的雾资料。分析了雾的时空分布特征夏形成条件。结果表明：辽宁年平均雾日地域分布呈现两高三低的形势。雾日的年际变化曲线较平稳，雾日最多的年份和最少的年份相差17d。沈阳与大连雾日变化相反，大连呈下降趋势，沈阳则在平稳中略有上升。辽宁大雾每个月都可形成，但沿海地区和内陆又有所差异，沿海地区主要出现在5～8月，而内陆地区主要出现在8-11月。雾日的天气形势可分为5～7种类型，其中以倒槽型、锋面气旋型、地形槽型、冷高压前部型最为典型。

The fog data in twelve typical stations in Liaoning province from 1951 to 2003 were used to analyze the temporal and spatial distributions and the formation conditions of the fog. It showed that the mean regional distribution of the foggy day in Liaoning province presented a ＂M type＂. The interannual variability curve of the foggy day＇ in Liaoning province was stable. The maximum difference of the foggy days between years could reach 17 day＇s. The change of foggy days between Shenyang and Dalian during recent fifty-three years was opposite. There was a decent situation in Dalian, but a little ascent above stability in Shenyang. The heavy fog might happen every month, but there was much difference between coastal and inland areas. The fog in coastal areas mainly appearred from June to July, whereas that in inland areas from August to November. Basically, the weather situations of foggy days could be separated into five to seven types.