对流云街激发的重力波和波动阻力

大气边界层中的对流活动,可以在其上部稳定层中激发出重力波,并引起垂直动量输送,影响到对流层和平流层中的动量平衡过程.从二层模式中大气波动方程的线性解出发,得出了对流云街激发的重力波波阻解析表达式,并讨论了大气条件对波阻的影响.这些分析可有助于大气环流模式(GCM)中此类重力波波阻参数化表达式的建立和改进.

Gravity Waves and Wave Drag Induced by Convective Cloud Streets

Convective activities in the atmospheric boundary layer, for example the cloud streets, may generate gravity waves in the overlying stable layer, cause vertical momentum transport and affect the momentum budget in upper troposphere and stratosphere. In the present study, the linearized atmospheric wave equation is solved analytically in a two-layer model to obtain a parameterization scheme for wave drag of gravity waves induced by convective cloud streets. The effects of the atmospheric conditions on wave drag are discussed. These analyses may be of benefit to the establishment and improvement of convectively generated wave drag in GCM or large-scale numerical forecasting models.