气候变暖背景下石家庄冷空气活动的气候特征

依据GB/T 20484—2006冷空气标准，对1972—2007年石家庄市17个地面观测站气温资料进行统计，分析了石家庄冷空气时空分布及强度变化基本特征。结果表明：受地域影响，石家庄东北部和南部是两个冷空气活动频次较高的中心；在气候变暖背景下，石家庄最低气温升高趋势与冷空气活动次数及强度减少趋势呈显著负相关；3—4月石家庄南部寒潮发生频次高于东北部地区，危害最大。

Climatic characteristics of cold air under global warming in Shijiazhuang,Hebei province

According to GB/T 20484-2006 cold air criteria, air temperature from 1972 to 2007 in 17 ground observation stations of Shijiazhuang were analyzed. The temporal-spatial distributions and intensity changes of cold air were discussed in Shijiazhuang, Hebei province. The results indicate that two high-frequency activity centers of cold air are located in the northeast and south of Shijiazhuang because of regional influence. The minimum air temperature increases, the numbers and intensity of cold air activity decrease under global warming, and both are a negative correlation. Frequencies of cold wave in the south of Shijiazhuang are higher than those in the northeast region from March to April, which will bring larger hazards.