阿勒泰山脉对新疆北部地区强暴雪过程影响的数值模拟研究

本文利用中尺度数值模式WRFV3.1对2010年1月6-8日新疆阿勒泰地区的强暴雪过程进行了敏感性数值模拟实验，来研究阿勒泰山脉地形对此次暴雪的影响。结果表明，阿勒泰地形对此次暴雪过程的形成和发展有明显的作用：（1）削减阿勒泰地区地形20%后，在阿勒泰山脉以西会导致降水减少，而在其以东则会导致降水增加；（2）对流层低层垂直速度的分布显示，在此次暴雪过程中，阿勒泰地区存在由于山脉地形引起的地形波，削减地形后会导致山脉地形波的强度减弱；（3）削减阿勒泰地区的地形后，在对流层低层700hPa，会出现气旋式环流增强的特征，而涡度场的表现则比较凌乱，同时也会对水汽场及云微物理量场产生影响。

Numerical Studies on the Effect of Altai Mountain on the Severe SnowStorm in North of XinJiang

The effect of Altai Mountain on the snowstorm which occurred in the north of Xinjiang during 6 to 8 January 2010 was studied by Topographic sensitivity numerical experiments with WRF model. The results show that the Altai Mountain has obvious effect on the snowstorm. (1) The precipitation should increased in the east of The Altai Mountain and reduced in the west when the topographic height reduced about 20%;(2) The mountain wave occur in the Altai Mountain during the snowstorm process, the intensity of the mountain wave should decreased the topographic height reduced about 20% ;(3) The cyclonic circumfluence in 700hPa should increased otherwise the voticity has the untidy characters when the topographic height was reduced, which also should has effect on the fields of specific humidity and Cloud microphysics.