CAO Yong-xing,CAI Hong-ke,XUE Zhi-hang.Characteristics Analysis on Super Rainstorm Caused by Tropical Depression in Hainan Province during the Autumn of 2010[J].Journal of Chengdu University of Information Technology,2017,(04):445-452.[doi:10.16836/j.cnki.jcuit.2017.04.016]
2010年秋季热带低压引发海南省特大暴雨特征分析
- Title:
- Characteristics Analysis on Super Rainstorm Caused by Tropical Depression in Hainan Province during the Autumn of 2010
- 文章编号:
- 2096-1618(2017)04-0445-08
- Keywords:
- climatology; climate change; Hainan province; rainstorm; tropical depression
- 分类号:
- P458.1+21.1
- 文献标志码:
- A
- 摘要:
- 为了对2010年秋季一次热带低压引发海南省特大暴雨特征进行深入分析,利用台风信息资料、海南省降水资料和ECMWF的ERA-interim资料,借助动力和热力条件诊断方法对此次特大暴雨过程的影响机理进行分析研究。结果表明:2010年10月5-9日海南省出现了连续的强降水过程,5日、6日海南省东部和8日海南省东北部均出现了250 mm以上的特大暴雨。此次连续强降水过程中,热带低压东侧的偏南气流持续将南海水汽卷入海南省,对流层低层积聚了大量不稳定能量,600 hPa以下大气均处于强烈的对流不稳定条件下,对流层中层干冷,低层暖湿,加之高空急流的辐散作用,为暴雨的发生发展维持提供有力动力条件。5日强烈上升运动突破了600 hPa以上的对流稳定层,激发大量不稳定能量的释放,形成了特大暴雨,6日之后水汽输送和上升运动均有所减弱,暴雨强度随之减弱,8日由于热带低压西侧的反气旋发展,并在高空急流逐渐向南入侵的配合下,高层冷空气向低层传输注入低层暖湿气流之中,是8日海南省东北部的特大暴雨形成的主要原因。热带低压西侧的反气旋增强发展东移,阻碍了热带低压向西北方向移动进而发生偏转折向东移,反气旋西侧高压坝的存在给热带低压东移横穿海南省提供了动力条件。
- Abstract:
- In order to deeply analyze the characteristics of a super rainstorm process triggered by the tropical depression system in Hainan Province during the autumn of 2010, based on the typhoon information, precipitation data of Hainan province and ECMWF data of ERA-interim, the influence mechanism of the super rainstorm process was systematically analyzed, such as the dynamic and thermal diagnosis methods. The results show that, from October 5th to 9th in 2010, Hainan province experienced a continuous heavy rainfall process. There were super rainstorms that the precipitation was more than 250 mm in October 5th and 6th in the eastern of Hainan and on October 8th in the northeast of Hainan. During the continuous heavy rainfall process, the south side of the tropical depression continued to the South China Sea water vapor involved in Hainan province. A large number of unstable energy accumulated in the lower troposphere, the atmosphere below 600 hPa is under strong convective instability. The middle troposphere dry, low layer warm and wet, and the upper jet divergence effect, that provides a powerful dynamic condition for the development and maintenance of rainstorm. On October 5th, the strong upward movement broke through more than 600 hPa convective stable layer, stimulated the release of a large number of unstable energy, forming heavy rain. After October 6th, both water vapor transport and ascending motion weakened, and rainstorm intensity weakened. Since October 8th on the west side of the tropical depression anti cyclone development, and in cooperation with the upper jet gradually to the south of invasion, the high-level cold air to the low layer transmission layer of warm air in low injection, that is the main reason for the formation of torrential rain in Northeast of Hainan province on October 8th. The anticyclone on the west side of the tropical depression enhanced and moved eastward, hindered the tropical depression to move northwest and then turned to move to the east. The existence of the high pressure dam on the west side of the anticyclone provided dynamic conditions to the tropical depression eastward across in Hainan province.
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备注/Memo
收稿日期:2016-12-19 基金项目:国家自然科学基金资助项目(41405031、41475037); 公益性行业(气象)科研专项资助项目(GYHY201506013)