摘要
选取１９８２／１９８３年夏季（６～８月）欧洲中期预报中心８５０ｈＰａ、３００ｈＰａ两层纬向风场的网格点资料，采用复经验正交函数（ＣＥＯＦ）讨论了准双周振荡的位相传播及振荡的地理特征。结果表明：①２０°Ｎ以南对流层高层（３００ｈＰａ）１９８２年振荡显著区域是印度半岛至菲律宾东部一个西西北－东东南走向的带状区域４低层（８５０ｈＰａ）１９８２年５°～１５°Ｎ之间以及中国东南部及其沿海地区都是振荡的显著区域；而１９８３年３０°Ｎ以南振荡明显比１９８２年弱，只有中国东南沿海部分地区及孟加拉湾东南、马来西亚北部是振荡的显著区域。②对流层高层（３００ｈＰａ）１９８２年８５°～９０°Ｅ，３０°～４０°Ｎ的青藏高原是振荡的源区，其南传支波列可传到盂加拉湾北部的２０°Ｎ附近；而１９８３年青藏高原上８０°～９０°Ｅ，３５°～４０°Ｎ区域是振荡的汇区。
By using CEOF,the phase propagations and geographical features of the 10～20 daylow-frequency oscillations have been discussed using the data of the daily 850 hPa and300 hPa ECMWF zonal wind data from June to August,1982/1983.The results showthat(1)On 300 hPa,the oscillations have a obvious region, it was to the south of 20°Nfrom lndia to the east of the Philippines in 1982.On 850 hPa,the obvious regions ofoscillation were in 5 ～ 15°N, 75～132.5°E,and the southeast coast of China in 1982.However , only the obvious regions of oscillation were in the southeast coast areas ofChina,in the southeast of the Bay of Bengal,and to the north of Malaysia in 1983.(2)On300 hPa, a source of the oscillatiOn was in 30°～40°N, 85°～90°E in 1982 , and thebranch oscillation can propagate south ward to the north of the Bay of Bengal around28°N。 However,oscillations converged in 35°～40N°,80°～90°E in 1983.
出处
《应用气象学报》
CSCD
北大核心
1995年第2期206-212,共7页
Journal of Applied Meteorological Science
