华北区域环流型与河北气候的关系

摘要

Based on the monthly mean NCEP/NCAR reanalysis sea level pressure data during 1951-2006,by using the Lamb-Jenkinson method,the regional atmospheric circulations over North China were divided into 27 patterns,among them eight major paRems(A,SW,NE,W,C,N,ANE,and AN)accounting for 64.43%of total number of circulation patterns in the 56-year.Each month(season)is tendentious to have itself prevail circulation pattern;patterns A and NE are prevail ones for winter and patterns SW and C for summer;and the number of occurrence for the principle pattern A of winter and that for the principle pattern SW of summer have an opposite change tendency.The summer precipitati-on in Hebei intends to have an obvious in-phase change with the occurrence number of pattern SW,and an anti-phase change with the occurrence number of pattern A.That is to say,if there is more pattern A in winter than normal,then there must be less paaern SW for sulniner,therefore leading to less precipi-tafion in summer;and vice versa.The winter principle circulation pattern significantly changed in the 1960s,and the summer principle circulation patterns had happened significantly changed twice in the 1960s and 1970s,respectively.Afterwards,changed patterns maintained.Hebei province climate changes have a good relationship with those in North China regional circulation pattern.%利用Lamb-Jenkinson方法和NCEP/NCAR再分析的1951--2006年月平均海平面气压场资料.对华北区域环流进行分型并分析了对河北气候的影响.结果表明,影响华北的主要环流型有8种(A、SW、NE、W、C、N、ANE、AN),占全部环流型的64.43%.冬季主要盛行A、NE环流型,夏李主要盛行SW、C环流型,冬季最主要的环流型A和夏季最主要的环流型SW出现次数呈反相变化.河北夏季降水量与SW出现次数呈明显的同相变化,而与A型出现次数呈非常好的反相变化,即冬季A环流型出现多,夏季SW环流型出现就少,夏季降水量就少,反之亦然.冬季的主要环流型在20世纪60年代中期发生了明显改变,夏季环流型在60年代和70年代发生了两次明显改变,之后基本维持改变后的环流型.河北气候与区域环流型变化有很好的对应关系.