摘要
利用ＮＭＣ客观分析８５０ｈＰａ（１９７４．１２─１９８８．２）和２００ｈＰａ（１９６８．３─１９８８．２）平均纬向风资料，对其准两年振荡和准３─４年振荡进行了研究。结果发现：纬向风准两年、准３─４年振荡在热带地区上、下层均一致自西向东传播，但位相相反；在中纬度地区，纬向风准两年、准３─４年振荡上、下层均盛行自西向东传播，且位相一致；西太平洋地区低层纬向风准３─４年振荡均为从南、北半球中纬度地区向赤道传播；高层纬向风准３─４年振荡在１７５─１４０°Ｗ附近存在一明显的通道，且为自南向北传播，而且在经向上呈１波特征。
Using mean zonal winds objectively analysed by NMC for 850 hPa (Dec. 1974-Feb. 1988) and 200 hPa (Mar. 1968-Feb. 1988), quasi-biennial and quasi-3-to-4-year oscillation are invenstigated. It is found that the two oscillations are propagating from west to east at all levels, being out of paase for the tropics but in phase for the mid-latitudes; for the latter oscillations in West Pacific, it travels equatorially from both mid-latitudes at low-levels while from south to north through a well-defined channel at 175-140°W at upper levels with wavenumber 1 in meridionality.
出处
《热带气象学报》
CSCD
1994年第2期140-145,共6页
Journal of Tropical Meteorology
基金
国家自然科学基金
关键词
纬向风
年际振荡
传播
太平洋地区
Zonal wind, Interannual oscillation, Propagation
