| 摘要: |
| 基于WRF模式和FNL再分析资料对2022年6月17日-18日贵州省黔东南州一次初夏典型暴雨过程开展数值模拟及雷公山、月亮山的地形敏感性试验。结果表明：WRF模式能较好地模拟出该过程的强降水落区及强度，高空槽、低层的切变线辐合抬升，配合西南急流带来的充沛水汽导致本次暴雨过程的发生。通过地形敏感性试验发现雷公山高度降低，整层大气湿层降低，水汽辐合作用减弱，垂直运动减弱，南部CAPE值变大，使得强降水中心落区向南偏移，降水量减少35%以上；月亮山高度降低，配合下游方向有利地形，偏西南区域水汽辐合增强，对流发展强且上升运动层厚，南部偏东区域CAPE减弱，使得强降水中心向南、向西偏移，降水量增加35%以上。地形高度降低还会引起不同高度层的天气系统位置和强度的变化，850hPa气流辐合减弱以及700hPa槽位置的偏移，导致降雨量减弱、降水落区改变。 |
| 关键词: 黔东南州;暴雨;地形;数值模拟;敏感性试验 |
| DOI： |
| 投稿时间：2024-04-23修订日期：2024-08-22 |
| 基金项目:贵州省气象局科研业务项目（黔气科登2023-10-07）：黔东南州“两山”对暴雨过程的地形敏感性试验及研究；黔东南科合基础（〔2022〕09号）：基于区域自动站的黔东南“两山”地区致灾暴雨研究 |
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| Topographic Sensitivity Test of a Typical rainstorm Process in Qiandongnan Prefecture of Guizhou Province |
| WANG YAO,BAI HUI,ZHANG CHAO,LUO XUE CHUN,Kong DE XUAN,CHI ZAI XIANG |
| (Guizhou Institute of Mountain Meteorological Science;Qiandongnan Miao and Dong Prefecture Meteorological Bureau of Guizhou Province;Kunming Meteorological Bureau) |
| Abstract: |
| Based on WRF model and FNL reanalysis data, a typical rainstorm process in Early summer in Southeast Part of Guizhou Province from June 17 to 18, 2022 was numerically simulated and terrain sensitivity tests of Leigong Mountain and Moon Mountain were carried out. The results show that the WRF model can well simulate the strong precipitation area and intensity of the process, the convergence and uplift of the shear line in the upper trough and the lower level, and the abundant water vapor brought by the southwest jet stream lead to the occurrence of this rainstorm process. Through terrain sensitivity tests, it was found that the height of Leigong Mountain has decreased, the entire atmospheric wet layer has decreased, the water vapor convergence has weakened, the vertical movement has weakened, and the CAPE value in the south has increased, causing the central precipitation area to shift southward and the precipitation to decrease by more than 35%; The height of Moon Mountain has decreased, combined with favorable terrain in the downstream direction, resulting in enhanced water vapor convergence in the southwestern region, strong convective development, and thick upward motion layers. The CAPE in the southern eastern region has weakened, causing the center of heavy rainfall to shift southward and westward, resulting in an increase in precipitation of over 35%. The decrease in terrain height causes changes in the position and intensity of weather systems at different altitude levels, weakening of 850hPa airflow convergence, and displacement of 700hPa trough positions, resulting in reduced rainfall and changes in precipitation zones. |
| Key words: Qiandongnan Prefecture; Terrain; Rainstorm; Numerical Experiment; Sensitivity test |
