Numerical Simulation of Frontogenetical Process of the East of the Tibetan Plateau by Quasi-Lagrangian Limited Area Model
用10层准拉格朗日有限区域模式对高原东侧锋生过程的数值模拟

A frontogenetical process of OOGMT 15- 00GMT 17 August, 1981 has been discussed. Results are summarized as follows. (1 )During this period, cold air invaded North China from middle-high latitudes and, at the same time.the warm air originating from the SE of the Tibetan Plateau already extended Northwards and reached the Korean Peninsula by OOGMT 17 August. Strong interaction between cold and warm air occurred in North China, then, a cold front formed and intensified. This situation is quite different from Baiu front. (2) A ten - level quasi - lagrangian limited area numerical model with terra in of the Tibetan Plateau was used to simulate the process successfully. In our experiments, different schemes of terrains and lateral boundary conditions were tested. It is shown that the results of simulation experiments are very sensitive to some schemes .( 3 ) Frontogenetical function, F-d/ dt , was calculated at different standard pressure surfaces, respectively. It is found that the maxima of frontogenetical function appeared ahead of the trough at 700 hPa and the deformation term of frontogenetical function probably contributes greatly to the development of mesoscale systems near frontal zone in North China.