摘要
利用月平均环流资料，通过计算持续性概率，分析了北半球对流层环流持续性的时空变化规律及其影响持续性的各种因素。结果表明，环流的持续性，高层比低层好，低纬度比中高纬度好，东半球比西半球好。冬夏季持续性明显高于春秋季，秋季环流最容易发生转折。持续性还存在着准２年、４年和６．５年的周期变化，这些准周期分别与ＱＢＯ及厄尔尼诺现象和太阳活动的周期振荡相吻合。平流层为西风位相时对流层环流持续性增强，东风位相时减弱。对流层西风环流、副高、极涡的异常变化有利于环流持续。太阳活动异常、厄尔尼诺事件发生、火山爆发等往往导致环流的持续性减弱。
s:The temporal and spatial characteristics of the persistence of monthly mean atmospheric circulation in the troposphere over the northern Hemisphere are investigated.It is indicated that the persistence is higher in upper-troposphere than in low-troposphere,in low-latitude than in highlatitude,in the eastern Hemisphere than in the western Hemisphere,in winter and summer than in spring and autumn.The factors influencing on the persistence are also analysed.It is found that the persistence links with solar activities,QBO,EL-Nino events and volcanic activities. Quasi-oscillations of 2 year,4 year and 6.5 year of the persistence are closely connected with the above metioned factors.
出处
《气象》
CSCD
北大核心
1995年第5期3-8,共6页
Meteorological Monthly
基金
<长期天气预报理论和方法研究>项目资助
关键词
环流
持续性
时空变化
影响因素
对流层
大气
atmospheric circulation
persistence
time and space feature
influencing factors
