摘要
利用时间平均全球大气环流资料,本文计算了纬向平均位涡的南北梯度的时空分布,以及波动水平传播的临界波数n_s,和垂直传播的临界波数K_c的时空分布。由此研究全球大气定常波传播的运动学特征及其年变化。
Time-mean global general circulation data are employed to analyse the temperal and spatial variation of the meridional gradient of zonal mean potential vorticity, the critical wave number nc for horizontal wave-propagation, and the critical wave number Kc for vertical wave-propagation. Thereby the kinematic characteristics for the propagation of atmospheric stationary waves an.d their annual variations are studied. Results show that in the troposphere nc and Kc usually decrease with the increase of either latitude or altitude. Synoptic and near-resonant Rossby waves could be trapped during their upward and meridional propagations. These characteristics possess prominent annual variations, especially in the Northern Hemisphere. It is found that the spatial and temperal variations of these kinematic characteristics are in good agreement with those of the atmospheric wave patterns.
出处
《气象学报》
CSCD
北大核心
1990年第1期36-45,共10页
Acta Meteorologica Sinica
基金
国家自然科学基金~~
