高原东侧特大暴雨过程中秦岭山脉的作用  

Effect of Qinling Mountains of a Extremely Heavy Rain-Storm Process on the East Side of Qinghai-Xizang Plateau

作　　者：慕建利[1,2] 李泽椿[3] 李耀辉[4] 

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044 [2]中国气象局北京城市气象研究所,北京100089 [3]中国气象局国家气象中心,北京100081 [4]中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730020

出　　处：《高原气象》2009年第6期1282-1290,共9页Plateau Meteorology

基　　金：陕西省多物理暴雨集合预报方法研究(IAM200709);国家自然科学基金项目"干旱背景下黄河流域致洪暴雨的多尺度天气学模型研究"(40505010);科技部973项目(2003CCC01500)共同资助

摘　　要：利用中尺度数值模式MM5V3.5对2002年6月8～9日陕西特大暴雨过程进行了数值模拟,在模拟结果和实况较吻合的情况下,通过敏感性试验,研究了秦岭山脉在这次暴雨过程中所起的作用。结果表明,秦岭山脉在这次暴雨过程中对降水的强度有很大的影响,即秦岭山脉使陕甘宁边界的长城沿线、秦岭山脉、汉江河谷一带降水量增加,使关中盆地、陕北南部、大巴山东南坡降水量减少。进一步研究表明,秦岭山脉主要是通过形成局地环流,使气流产生辐合,大量的水汽和位势不稳定能量在迎风坡堆积,上升运动加强,从而使位势不稳定能量得以释放,触发了对流降水。A heavy rainstorm happening in the Shannxi Province during 8-9 June 2002 is diagnosed and simulated using the MM5 model. The results show that the simulated precipitation is quite good represent the real precipitation. Through the sensitivity test and analyses, the effects of Qinling Mountains on the torrential rainstorm are studied. The results indicate that the terrain played an important rule in the formation of the heavy rainstorm. Qinling Mountains caused the increase of rainfall in the north of Shanbei, Qinling Mountains, Hanjiang bayou and the decrease of rainfall in the Guanzhong basin, the south of Shanbei, the southeast slope of Daba Mountain. The effect of Qinling Mountains on precipitation was caused by the convergence line and the perturblance generated by mesoscale terrain. In the rainstorm, local circulation at the center of rainstorm is generated by the topography converge. The upward motion is strengthened and instable energy is discharged.

关 键 词：特大暴雨 数值模拟 秦岭山脉的作用 

分 类 号：P458.121.1[天文地球—大气科学及气象学]