LAPS分析场资料在暴雨中尺度分析中的应用  

Application of LAPS Analysis Field in Rainstorm Mesoscale Analysis

作　　者：周后福[1,2] 郭品文[1] 翟菁[2] 邱学兴 倪允琪[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]安徽省气象科学研究所,安徽合肥230031 [3]安徽省气象台,安徽合肥230031 [4]中国气象局灾害天气国家重点实验室,北京100081

出　　处：《高原气象》2010年第2期461-470,共10页Plateau Meteorology

基　　金：国家重点基础研究项目"我国南方致洪暴雨监测与预测的理论和方法研究";中国气象局云雾物理环境重点开放实验室开放课题(200908)资助

摘　　要：利用常规地面探测、高密度自动雨量站、高空探测资料,并且融合多普勒雷达拼图产品,LAPS可输出比较精细的分析场。针对2008年6月21～22日一次暴雨天气过程,基于LAPS不同时空分辨率的中尺度分析场,分析了雷达回波、风场、高度场以及物理量场,比较不同时空分辨率LAPS分析场之间的差异。结果表明:(1)此次强降水过程可划分为2个阶段。第一阶段雨量集中在沿淮地区,呈纬向带状分布;第二阶段集中在大别山地区,其雨强更大,是中尺度局地性降水。(2)大别山区的地形抬升对低涡增强或减弱的演变具有重要影响,是低涡增强、发展的触发机制。当低涡接近大别山区时,低涡明显加强;当低涡逐渐远离大别山区时,低涡则减弱。(3)第一阶段有风的切变线,第二阶段有风的辐合,说明风场的辐合和切变促进云和降水的发生、发展,因此它们是产生暴雨的触发条件。(4)高分辨率的LAPS结果对于风场和云的变化刻画地更为细致。雷达回波发生在风的切变线处,或者风场辐合处;大别山区暴雨过程中,在其西侧有闭合性的涡旋,低涡缓慢东移,回波位于涡旋东侧,强降水发生在低涡东侧。(5)K指数、沙氏指数、整层可降水量与这次大别山地区暴雨过程具有较好的对应关系,与暴雨落区基本相同。这些指数在暴雨落区预报与应用方面具有一定参考价值。Based on the ground station,high-density rain station,upper detecting,and amalgamating Doppler radar mosaic,more fine reanalysis field outputted by LAPS,the radar echo,wind,height and physical quantity field are analyzed with mesoscale reanalysis field of different spatial and temporal resolutions of LAPS about a rainstorm in 2008.The analysis field of different spatial and temporal resolutions of LAPS is compared.The results are as follows.（1）The process of severe precipitation is divided into two stages.For the first stage,the rainfall of the zonal belt-shape is centralized along Huaihe River,while for the second stage,the rain belt is centralized along Dabie Mountain,and its intensity is stronger.The rainfall is centralized along Huaihe River during the first stage for zonal belt-shape distribution,and moves in Dabie Mountain during the second stage.The rain intensity in the second stage is bigger which is local rain of mesoscale cell.（2）Terrain uplift of Dabie Mountain plays an important role in enhancement or weakening to low vortex,and becomes triggering mechanism of low vortex change.When low vortex approaches Dabie Mountain,it obviously enhances;but when it is far away Dabie Mountain,it weakens gradually.（3）That the first stage has wind shear,the second stage has wind convergence,the first stage goes with wind shear and the second stage goes with wind convergence,and these show that the wind field convergence and shear promotes the development of cloud and rain.Therefore the convergence or shear of wind field is triggering condition of the rainstorm,too.（4） High resolution of LAPS embodies more detail wind and cloud change.During rainstorm process in Dabie Mountain,there is closed vortex on its west side.Low vortex slowly moves eastward,the severe precipitation occurs on the east side of low vortex.（5） K index,Shawalter index,integrated total precipitable water have the better homologous corresponding phenomenon with Dabie Mountain rainstorm,it is same as the rainstorm area.It has refe

关 键 词：LAPS分析场 暴雨过程 中尺度系统 

分 类 号：P458.121.1[天文地球—大气科学及气象学]