波包传播特征与西太平洋副热带高压移动的关系  

RELATIONSHIPS BETWEEN FEATURES OF WAVE PACKET PROPOGATION AND MOVEMENT OF WESTERN PACIFIC SUBTROPICAL HIGH

作　　者：宋燕[1] 缪锦海[1] 琚建华[1] 

机构地区：[1]中国气象局培训中心,北京100081

出　　处：《气象学报》2006年第5期576-582,F0003,共8页Acta Meteorologica Sinica

基　　金：国家重点基础研究发展计划973计划课题(2004CB418302);山西省气象局开放式研究基金(SX042002);中国科学院东亚区域气候-环境重点实验室开放课题

摘　　要：利用波包传播诊断方法,研究高频波波包传播特征与瞬变波和副热带高压北进南退的关系。波包传播的初步特征为冬季波包传播生命史长,一般为7—10 d,传播速度为2—10 m/s,中心强度可超过0.4,在中高纬度地区传播路径一般为先向东南移,后向东北移;夏季比冬季的生命史短,中心强度也弱,传播路径与冬季相同。热带地区的波包传播路径先向西南,后向北移。一般波包强中心增强时,有利于槽发展,当强中心明显减弱时,有利于槽的衰减。当波包强中心持续地叠加在脊上时,脊将减弱。副热带高压的明显北跳常与南海特征区(0°—20°N,100°—120°E)持续5 d及以上的无波包强中心活动有关,并且在2次季节性北跳之后,又持续5 d以上出现波包强中心;副热带高压南移过程都与持续5 d及以上的南亚区域波包强中心、台风强中心或温带波包强中心活动有关。On the basis of the diagnosis analysis of wave packet propagation, this paper investigates the relationship between propagation features of high frequency wave packets and the north-south movement of transient waves and subtropical high. The results show that in winter the wave packet was relatively stronger, with a central intensity reaching more than 0.4 and a longer life-cycle being 7 - 10 days, and it propagated usually at first southeastwards, then northeastwards at a speed of 2 - 10 m/s; however in summer its life-cycle and intensity became shorter and weaker. It availed the development/decay of a trough when a strong wave packet center nearby intensified/weakened, and If a strong center persistently overlapped on a ridge, then the ridge would decay. Obvious northward jumps （4 times） of subtropical high were usually related to that there was no activity of strong wave packet center at least for 5 days in the South China Sea area （0° - 20°N, 100° - 120°E）, and after two jumps, a strong wave packet center persisted in the area for more than 5 days. The southward retreats （5 times） of subtropical high were also associated with activities of South Asian strong wave packet center （0° - 20°N , 40° - 100°E） , strong typhoon center （0° - 30°N , 120° - 160°E）, or extratropical wave packet center for more than 5 days.

关 键 词：波包传播 瞬变波 副高北跳和南移. 

分 类 号：P467[天文地球—大气科学及气象学]