Numerical Simulation Experiment on Affecting Factors of Kunming Quasi Stationary Front Movement
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Abstract:
Based on the mesoscale WRF (Weather Research and Forecast) model, NCEP/NCAR reanalysis data and conventional meteorological observation data, the main moving process of the Kunming QuasiStationary Front （KQSF） from 22 to 24 January 2016 is simulated and sensitive tests are conducted to study the influencing factors of the KQSF movement. The results show that the WRF model successfully simulates the moving process of KQSF and the position of the front westward. When the height of the terrain increases by 1.2 times, the speed of the Kunming quasistatic front moving westward slows down, and the time for the front to cross the highest terrain near 103 °E is delayed by 9 to 12 hours, and the position of the front reaching the westernmost side is farther east than that of the unmodified terrain. The terrain is simulated by increasing 100 m, 200 m, 300 m, 400 m and 500 m, and decreasing 100 m, 200 m, 300 m, 400 m and 500 m. From the difference of the position of KQSF, the longer the simulation integral time is, the greater the difference of the front position is when the terrain height is changed. When the terrain is increased, the front is located to the east of 103°E of the relatively high terrain, which is blocked by the terrain, and the difference of the front position is relatively small. When the terrain height is reduced, the difference of the front position every 100 m is relatively large. It shows that the topography has a great influence on the moving speed of KQSF. When the temperature of the warm mass is increased by 2 ℃, the moving speed of the KQSF westward is faster. By strengthening the dynamic force field of the heating mass, the speed of KQSF westward is slowed down. From the simulation results of topography and heating mass sensitivity test, it can be seen that the factors affecting the moving speed of the Kunming quasistatic front are the topography and confrontation of cold and warm air masses, the heating masses play a relatively small role compared with topography.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.