|
|||||
|
|
| 辽宁一次特大暴雨过程的诊断分析 | |
| 引用本文： | 孙莹,齐杰,白广田,薛金艳,白华,王浩,杨鹏.辽宁一次特大暴雨过程的诊断分析[J].安徽农业科学,2010,38(32):18347-18350. |
| 作者姓名： | 孙莹 齐杰 白广田 薛金艳 白华 王浩 杨鹏 |
| 作者单位： | 1. 辽宁省丹东市气象台,辽宁丹东,118000 2. 辽宁省兴城市气象局,辽宁兴城,125100 3. 辽宁省东港市气象局,辽宁东港,118300 |
| 摘 要： | 利用常规观测资料、NCEP 1°×1°再分析格点资料,对2010年7月19~21日辽宁省特大暴雨过程的环流背景、低空急流对暴雨的触发作用、稳定度和动力条件进行初步诊断分析。结果表明,200 hPa存在辐散场,500 hPa长波槽带动冷空气东移到暴雨区上空,副热带高压脊线稳定维持是辽宁出现特大暴雨的有利环流背景条件。暴雨区上空底层存在明显水汽辐合,中层存在水汽辐散,底层水汽辐合长时间维持为暴雨的连续出现提供了有利的水汽条件。冷平流的入侵,在暴雨区上空出现能量锋生,因此河套冷平流的存在是此次特大暴雨生成和触发机制之一。高空辐散流场的增强,有利于低空低压的增强和维持,加强暴雨区的对流不稳定和垂直环流。 |
| 关 键 词： | 特大暴雨 诊断分析 低空急流 高空辐散 |
Diagnosis of a Torrential Rain Process in Liaoning Province |
|
| SUN Ying et al.Diagnosis of a Torrential Rain Process in Liaoning Province[J].Journal of Anhui Agricultural Sciences,2010,38(32):18347-18350. | |
| Authors: | SUN Ying |
| Institution: | SUN Ying et al (D,ong Meteorological Bureau of Liaoning Province,D,ong,Liaoning 118000) |
| Abstract: | By using conventional observation data and NCEP 1°× 1°reanalysis grid data,the circulation background,role of low-level jet in storm rainfall,stability and dynamic conditions of the torrential rain occurred during July 19-20,2010 in Liaoning Province were analyzed.The results showed that:the divergence field at 200hpa,long-wave trough over 500hpa inducing cold air eastward to the storm zone and the stable maintenance of subtropical high constituted very favorable circulation background for the torrential rain.Apparent underlying moisture convergence in the upper level,middle-level moisture divergence occurring over the storm zone and the long-time maintenance of bottom moisture convergence provided favorable moisture conditions for the continuous heavy rain.Invasion of cold advection leads to the energy strength in the storm zone,so the cold advection loop was one of the generation and trigger mechanism of the heavy rainfall.The increasing upper divergent field benefited the enhancements and maintenance of low voltage and strengthened convective instability and vertical circulation over storm zone. |
| Keywords: | Torrential rain Diagnostic analysis Low-level jet High-level divergence |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |