锦州地区大风气候特征及环流形势分析

Strong Wind Climate Characteristics and Circulation Analysis in Jinzhou

根据1973～2007年锦州地区5个观测站大风观测资料,采用线性趋势估计法和谱分析法分析了锦州地区的大风趋势和周期变化,同时通过普查天气图探讨了锦州地区四季大风的环流形式特点以及时空分布特征。结果表明,锦州地区大风呈波动下降趋势,具有3.5和7.0年的周期变化;大风四季以春季最多,夏季最少,冬、夏季次之;从环流形势分析来看,锦州地区与辽宁的大风环流形势相似,春季和秋、冬季环流形势基本一致,主要形势有北高南低(西高东低)、两高夹低、南高北低(东高西低)3种类型;夏季以中小尺度系统造成局地大风天气为主。

Based on wind data of 5 weather stations from 1973 to 2007 in Jinzhou,trend and periodic change of strong wind were analyzed by linear trend estimation modeling and spectral analysis,and strong wind climate and circulation characteristics were discussed. The results showed that the number of the wind days was coming down and the periodic changes were about 3.5 and 7 years. The number of strong wind days in spring is most,and fewer in autumn and winter,fewest in summer. There were the same circulation characteristics as else area in Liaoning,and wind circulation characteristics were divided into 4 types,i.e. north high south low type,two high clipping the low type,south high north low type and meso-micro scale type.