摘要
本文用东亚低纬地区常规观测资料研究了1988年南沙海区夏季风期间西南大风成因及预报着眼点。结果表明,南沙海区西南大风产生的原因有:1)东亚季风环流的准双周振荡;2)南半球澳大利亚冷高压加强造成赤道105～110°E地区的过赤道气流加强,结果启动东亚季风环流并使其加强;3)北半球ITCZ上热带气旋移近南海时,也可启动季风环流并使其加强。预报着眼点主要是准双周振荡的时间、澳大利亚冷高压的强度和位置、北半球ITCZ上热带气旋的强度和路径、对流层高层北支高空东风急流的厚度变化等。
In this paper, the cause of the southwester's formation over the Nansha Sea area and its forecast starting points were studied during the summer monsoon in 1988, used the co-nventional observational data over the East Asian low latitude regions. It shows that the southwester over the Nansha Sea area mainly resulted from three aspects, as follow: firstly, the quasi-two weeks oscillation of the East Asian monsoon circulation in strength; secondly, the start and strengthening of the East Asian monsoon circulation by the forcing of theacross-equational flow ranging from 105°E to 110°E at the equator in which was resulted by the Australia cold high enhancing over the southern hemisphere; lastly, the start and stre-ngthening of the East Asian monsoon circulation by tropical cyclone in the ITCZ over northern hemisphere moving closely to the South China Sea and it indicates that the south-we-ster's forecast may focus attention on following: the period of the quasi-two weeks oscillation, the strength of Australia cold high and its location, the strength of tropical cyclone inITCZ over the northern hemisphere and its path, the depth of northen easterly jet over the upper level of the troposhpere and its change etc.
出处
《海洋科学》
CAS
CSCD
北大核心
1991年第3期35-38,共4页
Marine Sciences
关键词
南沙
海区
风
成因
预测
环流
East Asian monsoon circulation, Forecast starting points, Quasi-two weeks oscillation, Start
