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中文摘要：
依据水平风场分解思路，运用调和-余弦算法，准确分解有限区域Q矢量．根据已有的关于Q矢量散度和新发展的Q矢量涡度与天气系统对应关系的研究，运用分解得到的Q矢量旋转分量场和辐散分量场，改进传统Q矢量分析方法中单纯依靠Q矢量水平散度场进行的诊断分析．通过对一次暴雨个例的比较研究表明，在雨带形势和暴雨中心位置的动力识别方面，改进的Q矢量分析方法比传统的单纯依靠Q矢量散度分析方法具有更好的效果．
英文摘要：
According to the theory of separation and reconstruction of wind field, the Q vector is separated accordingly in limited area using the approach of harmonic-cosine series expansion. The rotational and divergent components of Q vector are introduced into diagnosing weather systems as an improvement in the traditional Q vector analyses. Through a case study of a torrential rain event, potential advantages of the improved Q analyses approach can be seen in dynamic identification of both the location and the position of heavy rain centers.
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