基于WRF模式模拟研究天山山脉地形对降水过程的影响  

Effect of Topography on Precipitation Process in TianshanMountains Based on WRF Model Simulation

作　　者：谢梦瑗 赵德龙[1] 成鹏[1] Xie Mengyuan;Zhao Delong;Cheng Peng(Urumqi City Bureau of Meteorology,Urumqi 830039,China)

机构地区：[1]乌鲁木齐市气象局,乌鲁木齐830039

出　　处：《黑龙江科学》2024年第6期16-19,24,共5页Heilongjiang Science

摘　　要：以2016年7月31日20时新疆伊犁河谷地区一次降水过程为研究对象,基于WRF模式模拟开展地形敏感性试验,对比分析天山山脉地形对伊犁河谷地区降水天气的影响。得出以下结论:向西开口的“喇叭口”地形会阻挡西风气流,有利于水汽在河谷内部堆积,导致河谷内降水增加;大地形对低层风速和风向影响较大,修改地形后会改变中低层天气系统的位置和强度;天山山脉的海拔高度会影响其附近区域地表及中高层的气温,进而改变各层温压场配置,影响气块垂直运动,通过热力作用影响降水过程;地形会对高低空急流的强度和位置产生影响,使得气流的辐合辐散及垂直运动发生改变,通过影响不稳定能量的释放影响降水的形成。Through taking a precipitation process in Yili Valley of Xinjiang at 20:00 on July 31,2016 as the research object,the terrain sensitivity test is carried out based on WRF model simulation,and the influence of topography of Tianshan Mountain on precipitation weather in Yili Valley is compared and analyzed.It is concluded that the“trumpet”topography of the west opening will block the westerly air flow,and facilitate the accumulation of water vapor in the valley,resulting in increased precipitation in the valley.Large terrain has a great influence on wind speed and direction at low level.After the terrain is modified,the position and intensity of the weather system at low level will be changed.The altitude of the Tianshan Mountain will influence the temperature of the surface,and middle and high levels in the surrounding area,and then change the configuration of the temperature and pressure field of each layer,the vertical movement of the air mass,and the precipitation process through the thermal action.

关 键 词：天山山脉 伊犁河谷 地形 数值模拟 

分 类 号：P461.3[天文地球—大气科学及气象学]