| 一次南方春季强对流过程中影响对流发展的环境场特征分析 |
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| 引用本文： | 陈涛,张芳华,宗志平.一次南方春季强对流过程中影响对流发展的环境场特征分析[J].高原气象,2012,31(4):1019-1031. |
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| 作者姓名： | 陈涛 张芳华 宗志平 |
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| 作者单位： | 国家气象中心,北京,100080 |
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| 基金项目： | 公益性行业专项“华南持续性暴雨中尺度特征诊断分析和预报技术研究” |
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| 摘 要： | 利用地面自动站资料、多普勒雷达资料、FY-2E卫星云图及NCEP FNL 1°×1°逐6h分析场资料,分析了2010年5月5-7日我国南方春季大范围强对流天气过程中尺度对流系统(MesoscaleConvective System,MCS)的发生、发展特征,重点探讨了环境条件差异及其对MCS的影响。结果表明,由于环境场三维动力结构、水汽条件和热力不稳定条件配置的差异,造成对流发展的多样化特征。利用相对风暴螺旋度分析了环境场动力特征对MCS组织结构的影响。重庆上空中高层较干且具有较强的垂直切变,环境场气旋式旋转相对深厚,随着锋面强迫抬升克服对流抑制作用后,局地激发出相对孤立的类似超级单体的强对流风暴,造成冰雹和雷暴大风等天气;而贵州湿层相对深厚,高低空急流的耦合机制更明显,贵州北部的多单体对流风暴组织程度较高,MCS尺度相对较大,局地短时强降水较明显;广东具有最强的垂直切变和深厚湿层,在浅薄冷空气的触发机制下,发展出深厚湿对流形式的中尺度对流复合体,出现了高度组织化的线状对流带,MCS尺度大、持续时间长,造成较强的降水。
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| 关 键 词： | 中尺度对流系统 垂直切变 风暴相对螺旋度 |
Analysis on Environment Field Characteristic of Influencing Convection System during a Severe Convective Process in Southern China in Spring |
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| CHEN Tao,ZHANG Fang-hua,ZONG Zhi-ping.Analysis on Environment Field Characteristic of Influencing Convection System during a Severe Convective Process in Southern China in Spring[J].Plateau Meteorology,2012,31(4):1019-1031. |
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| Authors: | CHEN Tao ZHANG Fang-hua ZONG Zhi-ping |
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| Institution: | (National Meteorology Center,Beijing 100080,China) |
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| Abstract: | Using the surface observation data,Dopple radar data and FY-2E satellite cloud image,a severe convective event in spring of Southern China on 5-7 May 2010 is studied.The initialization and developing of the MCS occurred in this event are analyzed,and the influence of variant environmental conditions on the MCS is discussed in detail.The resoult shows that the convective systems are caused to develop into various forms due to the difference of allocation in the dynamical structure,water vapour,and convective instability conditions.The relative storm helicity is used specially to analyze the dynamical characteristics of environmental flow and its impact on the MCS organization and structure.The resoult shows that there is drier air in the mid-upper level of local region of Chongqing,the vertical shear is strong,and the cyclonic rotating motion of environmental field is relative deeper,an isolate and similar supercell’s server convective storm is developped under the forced lifting mechanism of front surface,which cause the local hail,thunderstorm and gale weathers.The moist layer near Guizhou Province is deeper,and the coupling effect between upper and lower level jets is more clearly,so the organized multi-cell convective storm in larger space scale developed in north Guizhou Province,and the local short-time heavy rainstorm formed.There is the strongest vertical shear and deep moist layer in Guangdong Province,under the trigger mechanism of shallow cold air,the severe MCS with deep and moist convection form appears high organizing linear convection belt,and the MCS with large space scale and a long lifetime cause the severe precipitation. |
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| Keywords: | Mesoscale convective system Vertical shear l Storm relative helicity |
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