年变周期热源强迫下大气运动准二至三周低频振荡

THE TWO-THREE WEEK LOW FREQUENCY OSCILLATIONS CREATED BY ANNUAL PERIODIC THERMAL FORCING IN THE ATMOSPHERE

本文采用一个具有年变周期热源强迫的准地转两层低谱模式,数值地研究了大气运动的低频振荡问题。积分时间在5个模式年以上。结果表明,夏季高原南侧东风和副热带高压中心位置均具有准二至三周的振荡特征。

The low-frequency oscillations in the atmosphere are numerically stud-ied by use of a two-layer quasi-geostrophic. low-order spectral modelhaving annual periodic thermal forcing. The time of integration is morethan five model years. Studies show that the east wind south of themodel plateau and the subtropical high center are both characterized bytwo three week oscillations.