用全球原始方程半谱模式研究QBO对行星波传播的影响

本文建立了一个全球原始方程半谱模式,模拟了赤道上空风场准两年振荡(QBO)及其相应的副热带急流大小对冬季半球行星波向上传播及平流层突然增温的影响。结果表明,波数1的行星波在QBO东风相比西风相更易向上传播,平流层增温更快更强。波数2则相反。QBO对低纬对流层里的行星波上传的影响限制在低纬低平流层,对中高纬影响不大。

A GLOBAL PRIMITIVE EQUATIONS SEMI-SPECTRAL MODEL TO STUDY THE INFLUENCE OF QBO ON PLANETARY WAVE PROPAGATION

A global primitive equations semi-spectral model is used to simulate numerically the influences of Quasi-Binnial Osillation (QBO) of the equatorial stratospheric wind and its corresponding compatible subtropical jet strength on the upward propagation of north hemisphere planetary waves in winter.The results discover there is obvious influence on the upward propagation of the planetary waves and the stratospheric sudden wairming : for the general amplitude waves,wave 1 propagate upward more easily in the easterly phase of QBO than in the westerly phase,but counter to wave 1,the wave 2 propagate upward easily in the westerly phase;for the large amplitude waves,wave 1 create the stratospheric sudden warming faster and create larger warming amplitude in the eaterly phase than in the westerly phase,counter to wave 1,wave 2 create the stratospheric sudden warming more fast and create more large warming amplitude in the westerly phase than in the westerly phase.