昆明准静止锋移动影响因子数值模拟试验  

Numerical Simulation Experiment on Affecting Factors of Kunming Quasi Stationary Front Movement

作　　者：王曼[1] 朱莉[2] 段旭[1] 李华宏[2] 陈新梅[1] 李璠 WANG Man;Zhu Li;DUAN Xu;LI Huahong;CHEN Xinmei;LI Fan(Yunnan Institute of Meteorology,Kunming 650034;Meteorological Observatory of Yunnan Province,Kunming 650034;Chuxiong Meteorological Service,Yunnan,Chuxiong 675000)

机构地区：[1]云南省气象科学研究所,昆明650034 [2]云南省气象台,昆明650034 [3]云南省楚雄市气象局,楚雄675000

出　　处：《气象科技》2021年第3期362-371,共10页Meteorological Science and Technology

基　　金：中国气象局预报员专项项目(CMAYBY2020-119);国家自然科学基金项目(41805037);云南省自然资源厅项目“云南省地质灾害气象风险预警业务能力建设”共同资助。

摘　　要：利用中尺度WRF(Weather Research Forecast)模式,结合NCEP/NCAR再分析资料和常规气象观测资料,对2016年1月22—24日昆明准静止锋主要移动过程进行数值模拟和敏感试验,研究昆明准静止锋移动的影响因素。结果表明:WRF模式较成功模拟出此次昆明准静止锋锋面的移动过程和锋面西进的位置。当地形高度增加到1.2倍时,昆明准静止锋锋面西进的速度减慢,锋面越过103°E附近最高地形的时间推后了9~12h,锋面到达最西边的位置也较未修改地形的位置偏东。对地形进行增高100m,200m,300m,400m和500m,以及降低100m,200m,300m,400m和500m的模拟试验。从昆明准静止锋位置的差异看,地形高度改变后,模拟积分时间越长,锋面位置差别越大。地形增高后,锋面在相对高地形的103°E以东的位置,受地形阻挡,锋面位置差异相对小。当地形高度降低后,每下降100m,锋面位置差异相对大。说明地形对昆明准静止锋的移动速度影响巨大。当改变暖气团的热力场,增加暖气团气温2℃,昆明准静止锋西移速度增快。增强暖气团的气压和风场动力场,昆明准静止锋西进的速度减慢。从地形和暖气团敏感试验的模拟结果看,影响昆明准静止锋锋面移动速度的因素为地形和冷暖气团势力对比,冷暖气团势力对比因素对锋面移动速度的影响作用比地形因素相对小。Based on the meso-scale 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 quasi-static 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 mand 500 m,and decreasing 100 m,200 m,300 m,400 mand 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 mis 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 quasi-static front are the topography and confrontation of cold and warm air masses,the heating masses play a relatively small role compared with topography.

关 键 词：昆明准静止锋 地形 敏感试验 热力场 动力场 

分 类 号：P435[天文地球—大气科学及气象学]