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高原气象  2018, Vol. 37 Issue (6): 1671-1683    DOI: 10.7522/j.issn.1000-0534.2018.00036
论文     
台风残涡北上引发东北地区北部大暴雨的中尺度特征分析
任丽1, 赵玲1, 马国忠1, 林嘉楠2
1. 黑龙江省气象台, 黑龙江 哈尔滨 150030;
2. 宾县气象局, 黑龙江 宾县 150400
Analysis of Mesoscale Feature of a Heavy Rainstorm Caused by Typhoon Residual Vortex in the Northern Part of Northeast China
REN Li1, ZHAO Ling1, MA Guozhong1, LIN Jia'nan2
1. Meteorological Observatory of Heilongjiang Province, Harbin 150030, Heilongjiang, China;
2. Meteorological Office of Binxian, Binxian 150400, Heilongjiang, China
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摘要: 使用常规观测资料、卫星云图、雷达回波资料、自动气象站降水量以及0.25°×0.25°的NCEP/NCAR再分析资料,对1710号台风"海棠"残余环流北上引发的东北地区北部的大暴雨过程进行中尺度特征分析。结果表明,台风残余环流移入东北地区后再度加强。地面上负变压中心位于气旋北侧倒槽切变处,气旋的快速发展和加强的变压风辐合,造成低层辐合加强,导致大暴雨的出现。暴雨区呈带状分布,出现向北增强的趋势,在时空分布上都有明显的中尺度特征。探空分析显示暴雨区大气处于不稳定状态,有利于以短时强降水为主的对流发展。暴雨是由MCS活动造成的,每次短时强降水均与TBB低值中心相对应,并滞后1 h左右。对流云团自南向北传播,暴雨主要出现在冷云区内或是云团后部边缘TBB大梯度区处。雷达回波的后向传播造成暴雨区一直有强回波活动,降水持续时间长;强降水是暖云降水,降水效率高,雨强大。引发暴雨的中尺度对流系统具有深厚的垂直运动,加强了低层热量和水汽的向上输送。中低层正涡柱迅速增强,水汽辐合增强,加强了中尺度对流系统的发展和持续时间。中高层有干冷空气活动,不仅触发对流,而且大大降低了大气稳定度,为对流的发生、发展提供了有利条件。
关键词: 倒槽切变冷空气暴雨中尺度对流系统(MCS)    
Abstract: Based on the conventional observational data, satellite cloud images, radar echo data, automatic weather stations rainfall and NCEP/NCAR reanalysis data (0.25°×0.25°), the mesoscale features of a heavy rainstorm by the residual circulation of Typhoon Haitang in the northern part of Northeast China from 3 to 4 August 2017 were analyzed. The major conclusions were as follow:The residual circulation of typhoon had been strengthened again after it was moved into Northeast China. The negative pressure center on the ground was located at the inverted trough shear on the north side of the cyclone. The rapid development of cyclone and the enhancement of the convergence of the variable pressure wind resulted in the lower level convergence and heavy rains. The zonal distribution in the rainstorm area showed a tendency to increase northward, and there were obvious mesoscale features in the space-time distribution. Precipitation had the characteristics of strong intensity, sudden strength and short duration. The rainstorm zone was linear, with a horizontal width of 50 km and a length of 300 km, which had typical characteristics of the mesoscale-β. The sounding analysis showed that the atmosphere was in an unstable state, which was advantageous to the convection development with short time heavy rainfall. Heavy rains were caused by the mesoscale convection systems (MCS) activities. Each time the heavy precipitation was corresponding to the black body temperature (TBB) low value center, and the delay was about 1 h. In the process of convective cloud spreading from south to north, heavy rain occurred mainly in the area of cold cloud area or the TBB gradient at the posterior edge of the cloud cluster. The backward propagation of radar echo caused the strong echo activity in the rainstorm zone, and the precipitation lasted for a long time. Heavy precipitation was a warm cloud precipitation which led to high precipitation efficiency and strong rainfall. The mesoscale convective system which caused torrential rain, had a deep vertical motion. The deep vertical motion strengthened the lower layer heat and water vapor transmission. The positive vortex column of middle and lower level was enhanced rapidly, and the water vapor convergence was enhanced, which strengthened the development and duration of mesoscale convective systems. The middle and upper layer had dry air activity, which not only triggered convection, but also greatly reduced the atmospheric stability and provided favorable conditions for the occurrence and development of convection.
Key words: Inverted trough shear    cold air    rainstorm    mesoscale convection system
收稿日期: 2017-11-22 出版日期: 2018-12-24
:  P445  
基金资助: 黑龙江省龙云气象科技有限责任公司气象院士工作站(YSZD201702);中国气象局预报员专项(CMAYBY2017-021);黑龙江省科技厅省院合作项目(YS18Z01)
作者简介: 任丽(1982-),女,黑龙江牡丹江人,高级工程师,主要从事灾害性天气研究及常规天气预报.E-mail:strli@163.com
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引用本文:

任丽, 赵玲, 马国忠, 林嘉楠. 台风残涡北上引发东北地区北部大暴雨的中尺度特征分析[J]. 高原气象, 2018, 37(6): 1671-1683.

REN Li, ZHAO Ling, MA Guozhong, LIN Jia'nan. Analysis of Mesoscale Feature of a Heavy Rainstorm Caused by Typhoon Residual Vortex in the Northern Part of Northeast China. Plateau Meteorology, 2018, 37(6): 1671-1683.

链接本文:

http://www.gyqx.ac.cn/CN/10.7522/j.issn.1000-0534.2018.00036        http://www.gyqx.ac.cn/CN/Y2018/V37/I6/1671

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