| 高层动力强迫对回流型华南暖区暴雨影响的个例研究 |
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| 引用本文： | 张亚妮,姚秀萍,于超.高层动力强迫对回流型华南暖区暴雨影响的个例研究[J].热带气象学报,2019,35(2):166-176. |
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| 作者姓名： | 张亚妮 姚秀萍 于超 |
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| 作者单位： | 1.中国气象局国家气象中心，北京 100081 |
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| 基金项目： | 国家自然科学基金青年基金项目41205031中国气象科学研究院灾害天气国家重点实验室2014年度开放重点课题2014LASW-A03国家自然科学基金41475041国家自然科学基金91637105 |
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| 摘 要： | 应用NCEP再分析资料，分析了2014年5月8—9日发生在华南的一次暖区暴雨过程，研究高层动力强迫对此次华南暖区暴雨的影响。此次暴雨过程发生在暖湿的西南气流中，无明显天气尺度锋面系统影响，属于华南暖区暴雨过程。根据中尺度对流系统(MCS)的生消发展特征，可以将其分为5月8日与9日两个阶段，第一阶段具有显著的回流型暖区暴雨的特征，主要研究该阶段。研究发现，高PV扰动沿对流层高层南亚高压东北侧的西北气流下滑东移，导致IPV正异常，其东侧的辐散气流显著发展，在高层辐散气流的抽吸作用下，上升运动首先从中上层发展起来。在过程发展前期，IPV正异常主要是由平流作用引起，且在其东侧诱发出南风异常，进而导致辐散气流发展。当降水发生后，潜热加热反馈作用使高层辐散气流进一步加强，此时，辐散增强是对流发展的结果。此外，低层浅薄偏东风是本次暖区暴雨发生的低层背景场，其与西南风气流汇合，提供有利的低层辐合条件。
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| 关 键 词： | 暖区暴雨 高层动力强迫 等熵位涡异常 潜热加热 |
| 收稿时间： | 2018-04-25 |
A CASE STUDY ON THE EFFECT OF UPPER DYNAMICS FORCING ON
WARM VECTOR RAINSTORM OVER THE SOUTH OF CHINA |
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| ZHANG Ya-ni,YAO Xiu-ping and YU Chao.A CASE STUDY ON THE EFFECT OF UPPER DYNAMICS FORCING ON
WARM VECTOR RAINSTORM OVER THE SOUTH OF CHINA[J].Journal of Tropical Meteorology,2019,35(2):166-176. |
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| Authors: | ZHANG Ya-ni YAO Xiu-ping and YU Chao |
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| Affiliation: | 1.National Meteorological center, China Meteorological Administration, Beijing 100081, China2.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Science, Beijing 100081, China3.CMA Training Center, Beijing 100081, China |
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| Abstract: | Using NCEP reanalysis data, the impacts of upper dynamics forcing on warm vector rainstorm over the south of China are studied via a case on 8—9 May 2014. Results show that the rainstorm occurred in warm and wet southwesterlies without an obviously synoptic scale front in lower troposphere and was a warm vector rainstorm. According to the characteristics of mesoscale convective systems (MCS), the rainstorm can be divided into two different stages (May 8 and May 9). The first stage can be classified into a returning type of warm vector rainstorm and is focused on in this paper. Study shows that the high PV disturbance moves southeastward and then eastward along the northwest side of a South Asia High, and leads to the positive anomalies of IPV. At the eastside of the anomalies the divergence develops significantly. Due to upper-level tropospheric pumping, ascending develops first in the middle and upper layer. In the initial stage of the rainstorm, positive anomalies of IPV are caused mainly by advection, and on its east side southerlies are induced and divergence develops. After the occurrence of precipitation, the feedback of latent heat released from the precipitation intensifies the upper-level divergence, which is the result of the development of convection. In addition, the easterlies in the lower layer provide the background for this warm vector rainstorm. It can supply the low-level favorable convergence when meeting with southwesterlies. |
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