摘要
本文利用一个两层斜压准地转模式对形成相当正压性的物理机制进行了数值实验。结果指出:在对流层内初始等厚度线和等高线有明显交角的斜压扰动,将通过绝对涡度平流的非线性作用,在数天时间内就达到等厚度线和等高线近于平行的状态.这样就形成了大气的相当正压性。进一步的试验表明,β效应对于形成相当正压性起到了十分重要的作用。
A numerical experiment is carried out by using two-layer quasi-geostrophic model to explore the mechanism of equivalent barotropy. It is concluded that baroclinic disturbance, whose isopaches and isohypses are out of phase initially, can reach a state, in which the isopaches and the isohypses are parallel, a few days later owing to the effect of absolute vorticity advection. Through this process barotropy formed. Further experiment shows that beta-effect has played an important role in such process.
出处
《大气科学》
CSCD
北大核心
1991年第3期118-123,共6页
Chinese Journal of Atmospheric Sciences
关键词
涡度
平流
正压性
大气
Vorticity advection
β effect
Equivalent barotropy.
