一次暴雨过程的非平衡振动与诊断分析

Non-equilibrium Vibration and Diagnosis Analysis of a Rainstorm

采用诊断分析方法,对2010年7月15-18日四川盆地的暴雨天气过程进行分析。结果表明,在暴雨的强盛阶段和持续阶段,盆地内的上升气流均非常强盛,达300 hPa以上;在暴雨强盛阶段,气流的辐合层并不十分深厚,气流的辐合运动在500 hPa以下;此次过程中对流层低层的正涡度大值中心与暴雨区对应的相对较好,气流辐合辐散强度较旋转强度大一个量级,散度在系统变化过程中起主导作用;在暴雨强盛阶段,对流层低层非平衡值U〈0,较强的非平衡振动有利地激发辐合运动发展,对流层上层非平衡值U〉0,激发高层辐散运动发展,高层辐散带动低层辐合,形成强烈的上升运动。

The rainstorm weather from July 15,2010 to July 18,2010 is researched by diagnosis analysis method.Results suggest that in the strong and lasting period,the upward air current in the basin is prevail and is above 300 hPa.The convergence layer during strong rainstorm period is not thick.The convergence movement of air current is under 500 hPa.In this rainstorm process,the positive vortex maximum value center of the lower layer of convection layer is perfectly corresponding to rainstorm zone.The air current convergence and divergence intensity is one magnitude larger than the turning intensity.Flux plays a leading role in the system changes process;the non-equilibrium value of the low layer of convection layer during the strong rainstorm period U〈0.Strong non-equilibrium is favorable for the movement of convergence.The non-equilibrium value of the high layer of convection layer U〉0,and it stimulates the divergence movement of high layer.The divergence of high layer pushes the convergence of the lower layer and thus forms strong upward movement.