中尺度对流系统演变中的一些非平衡动力学问题

SOME PROBLEMS OF UNBALANCED DYNAMICS IN THE DEVELOPMENT OF THE MESOSCALE CONVECTIVE SYSTEM

深厚湿对流运动发展机制包含湿大气的对称不稳定 (MSI和CSI)及锋面环流 ,它们需要的基本条件是不稳定、水汽和抬升 ,这些机理在动力学中是有联系和区别的 ,即虽然都是与基流平衡状态被破坏后引起的中尺度环流有关 ,但是扰动流非平衡运动是不同的。本文综合概述了有关平衡动力学的研究进展 ,提出了中尺度对流系统演变中的一些非平衡动力学主要问题 ,并评述了一些研究的方法及主要结论和尚需进一步探索的方面 。

The development mechanism of deep moist convection includes two ways, one is the symmetric instability in moist atmosphere (MSI and CSI), the other is the frontal circulation, the basic conditions of deep moist convection development are instability, moisture and lift, there are either connections or differences between these mechanisms in the dynamics, that is to say, although they all are related to the mesoscale circulations resulting from the destruction of the balance of the basic flow, the unbalanced movement of disturbance flow is different. We first present a summary of the research of the balanced dynamics, then put forward some main points of unbalanced dynamics in the development of the mesoscale convective system, finally we make a comment on the approach, main conclusions and the aspects which need further study, in order to deepen the understanding of deep convection governed by different mechanisms.