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高原气象  2018, Vol. 37 Issue (5): 1289-1303    DOI: 10.7522/j.issn.1000-0534.2018.00015
论文     
两类动力因子对四川盆地一次低涡暴雨的应用研究
宋雯雯1, 李国平2,3, 龙柯吉1, 郭洁1,4
1. 高原与盆地暴雨旱涝灾害四川省重点实验室, 四川 成都 610072;
2. 成都信息工程大学大气科学学院, 四川 成都 610225;
3. 中国气象科学院灾害天气国家重点实验室, 北京 100081;
4. 气象灾害预报预警与评估协同创新中心, 江苏 南京 210044
Application Research of Two Types of Dynamical Factors in a Vortex Rainstorm in Sichuan Basin
SONG Wenwen1, LI Guoping2,3, LONG Keji1, GUO Jie1,4
1. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, Sichuan, China;
2. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, Sichuan, China;
3. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;
4. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing 210044, Jiangsu, China
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摘要: 利用常规观测资料、FY-2E卫星云顶黑体亮度温度(TBB)资料、欧洲中心0.25°×0.25°资料,选取质量散度、垂直螺旋度、质量垂直螺旋度、水汽垂直螺旋度、散度垂直通量、密度散度垂直通量、水汽散度通量等7个动力因子对2015年8月16-18日四川盆地一次暴雨过程进行诊断分析。结果表明:(1)此次降雨过程是由高原低涡、高原切变线、西南低涡等多个天气系统共同作用造成。(2)随着高原低值系统的东移、减弱,西南低涡的生成、发展,伴随的对流云团经历了连续生消的过程。(3)动力因子对此次暴雨过程的发展和演变有较好指示意义。动力因子大值区基本覆盖强降水区。西南低涡形成初期,动力因子大值区和高原切变线分布一致,降雨中心位于动力因子大值区和高原切变线右侧,与西南低涡中心对应。西南低涡强盛时期,动力因子大值中心、西南低涡中心、降雨中心趋于重合。降雨区上空存在质量散度辐合、气旋性涡度和水汽通量涡度的垂直向上输送及辐合上升运动。
关键词: 动力因子四川盆地暴雨诊断分析    
Abstract: By using the conventional observation data, the FY-2E satellite Black Body Temperature (TBB) data, the 0.25°×0.25° data of European Center, and based on the chosen dynamical factors including mass divergence, vertical helicity, mass vertical helicity, moisture vertical helicity, divergence vertical flux, density divergence vertical flux and moisture divergence flux, diagnostic analysis was performed for a rainstorm process occurred in Sichuan Basin during 16-18 August 2015. The results showed that:(1) the rainstorm event was caused by the southwest vortex formed and maintained in the central Sichuan Basin. The southwest vortex was because of the eastward movement of plateau vortex and plateau shear lines toward Sichuan Basin. (2) Following the eastward movement and weakening of the plateau low-pressure systems (plateau vortex and plateau shear lines), and the producing and development of the southwest vortex, the convective cloud cluster went through the process of "reinforce-combine-weaken-regeneration-reinforce-weaken". (3) Dynamical factors had good indication significance for the development and evolution of the rainstorm. The high value area of the dynamical factors basically covered the strong precipitation area. At the beginning while southwest vortex formed, the distribution of the dynamical factors and the plateau shear line were the same, and the rainfall center which located at the high value area of the dynamical factors and the right side of the plateau shear line was the same as the center of the southwest vortex. At the strong stage of the southwest vortex, the high value area of the dynamical factors, the center of the southwest vortex and the rainfall center coincided. The precipitation area had profound positive vorticity column and upward movement, but the convergence layer was too shallow. The mass divergence convergence, vertical upward transportation and convergence upward movement of cyclonic vorticity and moisture flux vorticity appeared above the precipitation area. Due to the vorticity effect of the vortex-type influence system was more obvious than divergence effect, the vertical structure of three helicity-type dynamical factors including vertical helicity, mass vertical helicity and moisture vertical helicity was very significant from the lower layer to the upper layer.
Key words: Dynamical factors    Sichuan Basin    rainstorm    diagnosis analysis
收稿日期: 2017-08-03 出版日期: 2018-10-19
:  P458.1+21.1  
基金资助: 国家自然科学基金项目(41675057,41675042,41765003);中国气象科学研究院基本科研业务费(2017Z017);高原与盆地暴雨旱涝灾害四川省重点实验室项目(2018-青年-10);中国气象局预报员专项(CMAYBY2018-064)
通讯作者: 李国平(1963-),男,重庆铜梁人,教授,主要从事天气动力学和高原气象的研究.E-mail:liguoping@cuit.edu.cn     E-mail: liguoping@cuit.edu.cn
作者简介: 宋雯雯(1986-),女,四川乐山人,硕士,主要从事天气动力分析与中尺度模拟研究.E-mail:songww8682@sina.com
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引用本文:

宋雯雯, 李国平, 龙柯吉, 郭洁. 两类动力因子对四川盆地一次低涡暴雨的应用研究[J]. 高原气象, 2018, 37(5): 1289-1303.

SONG Wenwen, LI Guoping, LONG Keji, GUO Jie. Application Research of Two Types of Dynamical Factors in a Vortex Rainstorm in Sichuan Basin. Plateau Meteorology, 2018, 37(5): 1289-1303.

链接本文:

http://www.gyqx.ac.cn/CN/10.7522/j.issn.1000-0534.2018.00015        http://www.gyqx.ac.cn/CN/Y2018/V37/I5/1289

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