斜压大气中的地形扰动

本文主要讨论地形对天气系统的影响,研究了斜压大气中地形背风气旋的问题。用小参数法简化基本运动方程,利用青藏高原和落基山脉的实际地形,采用FFT的数值方法,考虑了不同地形、风切变、大气层结等诸因素对地形扰动的影响。结果表明:青藏高原和落基山脉东侧的地形扰动与统计结果较一致;层结对地形扰动的影响较敏感。

OROGRAPHIC DISTURBANCES IN THE BAROCLINIC ATMOSPHERE

We primarily discuss orographic effect on the synoptic system, and study the problems of lee cyclogenesis in the baroclinic atmosphere. The basic motion equations are simplified by perturbation method. The equations are computed by FFT numerical method with actual orography of Qinghai-Xizang Plateau and Rocky Mountains. We consider variant factors that effect on orographic disturbances, such as various shapes of mountain, vertical shear of wind and atmospheric stratification. The results show that the orographic disturbances are consistent with the statistical results of lee cyclones of Qinghai-Xizang Plateau and Rocky Mountains; atmospheric stratification is most sensitive to orographic disturbances.