甘肃省近52年区域性沙尘暴的季节变化特征

Seasonal Features of Regional Sandstorm in Past 52 Years over Gansu Province

依据甘肃省75个气象观测站1955年～2006年的观测资料,分析了甘肃省区域性沙尘暴的季节变化特征,结果表明:全省年平均沙尘暴日数河西走廊北部最多,陇中和陇东的北部较多,其余地方较少;各季区域性沙尘暴次数随时间的变化呈减少趋势;春季区域性沙尘暴次数与冬季大风日数、强降温次数、寒潮次数为显著正相关,与冬季气温、降水量为显著负相关,研究结果为沙尘暴趋势预测提供了重要的依据.

Based on the sandstorm data of 75 meteorological stations in Gansu province from 1955 to 2006,the seasonal features of sandstorms in this area were analyzed.The results indicated that the yearly average sandstorm days were highest in the Hexi corridor,the second highest was in the middle part of Gansu and then in the north part of Longdong.They were few in the rest of Gansu province.The yearly average sandstorm days decreased by and by in the past 52 years.There is a positively correlatied relationship betw...