丹东地区大风气候事实分析

选取1980-2005年丹东地区4个测站的地面自记风记录,分析了大风时空分布特征,揭示了丹东地区大风的一些气候事实.丹东地区大风日数年际变化分3个阶段,1980-1991年正常偏少但波动较大,1992-1998年偏多,1999年以后明显减少;大风天气最多的季节是春季,以4月最多,其次是冬季,夏、秋季最少;大风最多风向是NNW,风向具有季节性差异;大风的空间分布与地形关系密切,沿海测站大风日数多于山区,且南大风日数居多.同时依据大风主要影响系统和天气形势特征,用天气学方法对大风进行了分型与分析.

Climatic Facts of Gale Weather of Dandong

The temporal and spatial characteristics of gale are analyzed by using the data for 26 years of surface wind of 4 auto-recorded observational stations in Dandong, some significant results are obtained. The annual frequency of gale weather may be divided into three periods from 1980 to 2005, less than normal but variable from 1980 to 1991, high frequency period from 1992 to 1998,obviously decrease from 1999 to 2005, and obvious reducing trend after 1999. The gale weather occurs mostly in spring, especially in April, then in winder, and the least in summer and autumn. The wind direction is most in NNW and different in each season. The spatial distribution of gale is closely related to the topography. The days of gale in the coastal observational stations are more than that in the mountains and the direction of most gales is in the south. The gale weather is analyzed and divided into some patterns according to the characteristics of the main influential systems and weather situation by using synoptic method.