“96.1”高原暴雪过程横波型不稳定的数值研究

利用一次较成功地模拟了“96.1”青藏高原东北部暴雪过程的MM4中尺度模式输出资料, 用非线性横波型不稳定模式对“96.1”暴雪发生发展过程的动力学机制进行了数值试验, 结果指出:横波型不稳定的分布和演变与暴雪切变线的发生发展过程相当一致, 说明横波型不稳定是这次暴雪过程的一种动力学机制.

NUMERICAL STUDY OF TRANSVERSAL WAVE INSTABILITY FOR THE "96.1" SNOWSTORM EVENT

Using the output data of an MM4 mesoscale numerical model which fairly well simulated the developing structure and the evolution of the "96.1" snow storm event over the Qinghai-Xizang Plateau, a nonlinear transversal wave instability model and simulation system is developed to validate the formation mechanism of the snow storm process. The results show that the fields of vertical velocity are coincident with not only with those of the stream function, but also with the observations. It indicates that the transversal wave instability is substantially a formation mechanism for the occurrence of the "96.1" snow storm.