Though normal mode Rossby waves frequently appear in the troposphere and the stratosphere, excitation mechanisms of normal mode Rossby waves are not clear. In this study, excitation mechanisms of the 5-day wave, which is one of the normal mode Rossby waves, are investigated by a series of general circulation model (GCM) experiments. The results of the numerical simulation show that the amplitude of the 5-day wave simulated by the GCM with uniform lower boundaries is similar to that with the realistic topography. On the other hand, the amplitude of the 5-day wave without moist convection is much smaller than that with realistic topography. The amplitude of the 5-day wave grows when the rainfall amplitude in the 5-day range is large. These results indicate that heating due to moist convection is most important for excitation of the 5-day wave.
|Number of pages||10|
|Journal||Journal of the Atmospheric Sciences|
|Publication status||Published - Jun 1 1999|
All Science Journal Classification (ASJC) codes
- Atmospheric Science