北太平洋中纬度地区加热场2年～4年振荡的诊断分析

DIAGNOSIS OF 2～4 YEAR OSCILLATIONS OF HEAT FLUXES OVER THE MIDLATITUDE NORTH PACIFIC

对北太平洋中纬度地区蒸发潜热、净长波辐射、感热输送和净太阳射入辐射场的３０年逐月平均资料进行功率谱、滤波、主分量和相关分析，讨论它们的时间演变特征。结果表明各场均具有２年～４年周期的年际振荡特征，并发现这种准周期振荡与ＥＮＳＯ之间有联系。

1950～1979 fluxes of latent heat, net longwave radiation, sensible heat and net solar radiation of the midlatitude North Pacific were investigated by means of power spectral, filtering, principal component and correlation techniques to reveal their timedependent variation features. Results suggest that all of the heating fields show 2～4 year oscillation in some relation to ENSO.