摘要
本文用1951—1989年38个冬半年的冷空气活动的资料,分为寒潮、强冷空气、弱冷空气三级,并按候、月、年研究其统计特征。结果指出:1.寒潮逐月累计频数表明,以11月和3月最多,2月最少。2.寒潮和强冷空气总和的强过程的年频数存在很大的年际变化,不但有2～5年变动,而且有约为20年的气候变动。自1970年以后,强过程总的趋势是逐渐减少的。另外,本文还初步探索了冬季欧亚大陆积雪与侵入我国冷空气的关系,冷空气是经过数据化处理的。得到的初步结果是,两者同期关系很差,而冬季积雪与春季冷空气有很好的正相关。
Using the record of cold waves invaded China during the 38 winter half-years from Septem-ber 1951 through April 1989,statistical features of the cold waves are pantadly,monthly andyearly investigated.The cold waves are divided into three grades,i.e.,severe,strong and moder-ate.The statistical results are as follows:1.From the accumulated monthly frequences it is shown that severe cold waves occur mostin November and March,but least in February.2.Yearly frequences of the strong events of the severe cold waves together with the strongcold waves show obvious interannual variations,in which there are not only 2—5 year oscilla-tions,but also about 20 yearly climatic variations.And,in the last twenty years the strong eventstend to gradually decrease.In addition,the relationship between the cold waves invaded China and the winter snow areacovered over the Eurasion continent has been preliminarily studied based on digitalizing the cold wave records.
出处
《应用气象学报》
CSCD
北大核心
1992年第2期235-241,共7页
Journal of Applied Meteorological Science
基金
高校博士点基金会资助
