摘要
从中尺度组织化深厚湿对流具有强烈的辐散风效应和强垂直运动的观测事实出发,评述了平衡流和非平衡流在对旋转风和辐散风的诊断分析中的作用和不足,介绍了准平衡流的原理、计算方法及其分别在台风暴雨和梅雨锋暴雨诊断研究中的应用。研究结果表明:准平衡流能真实反映涡散共存的大振幅垂直运动特征,暴雨区的垂直环流中有50%～70%归于准平衡流部分,准平衡流可以描述致洪暴雨过程中具有较长生命史组织化过程的深厚湿对流系统中垂直运动的主要部分,准平衡流场具有涡散运动共存的特征,准平衡流分析方法在中尺度深厚湿对流系统诊断研究中具有重要作用。
Based on the fact of meso-scale organized deep and moist convection having the dynamical characteristics of strong divergent wind and vertical motion, this paper outlines the functions and shortcomings of balanced and non -balanced flows in diagnostic analysis of rotational wind and divergent wind. The paper introduces the principle and calculation method of quasi- balanced flow, as well as its application in the research of typhoon rainstorms and Meiyu front rainstorms. Results show that quasibalanced flow can be a true reflection of the characteristics of large-amplitude vertical motion, in which vorticity and divergence coexist. 50%～70% of the vertical circulation in rainstorm area belongs to quasi-balanced flow. Therefore, quasi-balanced flow can describe the main part of vertical motion of deep and moist convection with long life and organized course. Quasi-balanced flow field has the characteristics of coexistence of vorticity motion and divergence motion. The analysis method of quasi-balanced flow has important effect in the diagnostic research of meso-scale deep and moist convection.
出处
《暴雨灾害》
2010年第2期105-110,147,共7页
Torrential Rain and Disasters
基金
国家重点基础研究发展规划项目(2009CB421500)
国家青年科学基金项目(40905022)
国家自然科学基金重点项目(40830958)共同资助
关键词
深厚湿对流
涡散共存
准平衡流
PV-ω反演方法
Deep and moist convection
Coexistence of vorticity and divergence
Quasi-balanced flow
PV-ω inversion method
