CAJ | 학술논문

采用非静力中尺度模式WRFV3.3对2010年7月12-13日一次江淮切变线暴雨过程进行数值模拟,分析了暴雨形成的大尺度环流条件、中尺度气旋演变,并对涡旋与变形场的相互作用指数VDI与降水之间的关系进行了探讨。结果表明：本次暴雨过程为典型的切变线降水过程,是在高层200 hPa强大的南亚高压稳定少动,中层500hPa短波槽生成东移、西太平洋副热带高压维持的背景下,由低层700 hPa和850 hPa切变线上中尺度低涡以及地面梅雨锋扰动的共同作用造成的。WRFV3.3较好地模拟了本次暴雨过程的雨带和暴雨中心。中尺度气旋发生于长江中下游呈东北-西南走向的切变线上,暴雨发生于700 hPa切变线南侧、低空急流轴的左侧,急流轴上的大风速中心与1 h雨强有较好的对应关系。中尺度涡旋与大风速中心之间存在着明显的相关性,风速增强,涡旋增强。VDI指数对降水中心和强度有较好的指示性,有助于在实际预报业务中对降水中心和强度做出正确判断。
채용비정력중척도모식WRFV3.3대2010년7월12-13일일차강회절변선폭우과정진행수치모의,분석료폭우형성적대척도배류조건、중척도기선연변,병대와선여변형장적상호작용지수VDI여강수지간적관계진행료탐토。결과표명：본차폭우과정위전형적절변선강수과정,시재고층200 hPa강대적남아고압은정소동,중층500hPa단파조생성동이、서태평양부열대고압유지적배경하,유저층700 hPa화850 hPa절변선상중척도저와이급지면매우봉우동적공동작용조성적。WRFV3.3교호지모의료본차폭우과정적우대화폭우중심。중척도기선발생우장강중하유정동북-서남주향적절변선상,폭우발생우700 hPa절변선남측、저공급류축적좌측,급류축상적대풍속중심여1 h우강유교호적대응관계。중척도와선여대풍속중심지간존재착명현적상관성,풍속증강,와선증강。VDI지수대강수중심화강도유교호적지시성,유조우재실제예보업무중대강수중심화강도주출정학판단。
By using the non-hydrostatic meso-scale model WRFV3.3, a shear-line heavy rainfall e- vent over Yangtze and Huaihe River basin during 12--13 July 2010 is numerical simulated. The large scale circulation condition, meso-scale cyclone development and the relationship between VDI （interac- tion index of vortex and deformation field） and rainfall are analyzed. It is shown that the shear-line heavy rainfall process occurs under the influences of the stable 200 hPa South Asia high, 500 hPa eastward short wave trough and western Pacific subtropical high, 700 hPa and 850 hPa meso-seale cyclones, and the perturbations of Meiyu front. WRFV3.3 is well simulated the rainbands and rainstorm center of rain- storm process. Meso-scale cyclones occurred within the northeast-southwest orientated shear line over middle and lower reaches of Yangtze River, while heavy rainfall occurred to the south of the shear line and to the left of the low-level jet （LLJ）. The large wind speed center of LLJ is well corresponding to the 1 h rain intensity. There is significant correlation between meso-scale vortex and large wind speed center, the stronger wind speed is, the stronger vortex becomes. The VDI is well directed the precipitation center and intensity, which is help to make the right judgment in the actual forecast.