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气象:2009,35(3):60-65
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一次飑线过程多普勒雷达资料分析
(1.山东省淄博市气象局 255048;2.山东省气象中心;3.山东省桓台县气象局)
Analysis on the Feature of Doppler Radar Data about a Squall Line Process
(1.Zibo Meteorological Office, Shandong 255048;2.Meteorological Center of Shandong Province;3.Huantai Meteorological Station, Shandong)
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投稿时间:2008-01-22    修订日期:2009-01-25
中文摘要: 利用济南CINRAD/SA多普勒雷达产品,针对2006年7月5日飑线天气过程,分析回波发展 演变、流场结构,讨论外流边界、强下沉气流与大风的关系,分析组合反射率因子、垂直液 态含水量、中气旋产品特征。结果发现,飑线过境时风速出现两个极大值,一个出现在外流 边界影响时段,另一个发生在强回波下沉气流影响时段;在横槽南下过程中,飑线后部强入 流不断补充,前侧暖湿气流沿着后部入流爬升,不断产生新的单体,使得风暴得以维持发 展;在垂直流场结构上表现为前侧暖湿气流倾斜上升,然后主体部分向后倾斜,后部有冷空 气注入,形成下沉气流,下沉气流在地面附近辐散,与前侧入流形成低层阵风锋,是 造成地面破坏性大风的主要因素。在水平流场结构上表现为低层存在气流辐合上升运动,中 层有气旋性旋转气流,风暴高层为辐散气流。飑线消散阶段后期中层出现MARC,带来大风天 气,而同时伴有冰雹天气的风灾产生在飑线达到最强至开始减弱的时段。当回波强度≥50dB z,且垂直液态含水量≥35kg·m-2,当有中气旋时,有利于产生冰雹和大风天气; 外流边界的出现,反映了强对流回波后部下沉气流较强,是灾害性大风的前兆。
中文关键词: 飑线  流场结构  大风  中气旋
Abstract:By using Jinan CINRAD/SA Doppler radar products, the weather proces s of squall line on July 5, 2006, evolution of echo and flow structure were anal yzed, the relations between the outflow boundary, sinking air currents and stron g wind were discussed,and the portfolio reflectivity factor, the vertical liqui d water content, the mesocyclone product characteristics were analyzed. The resu lts showed that two maxima of wind speed occurred during the squall line passing, one appeared in an outflow boundary impact sessions, another in strong echo si nking airstream affected periods. As the transverse trough moves southward, the inflow continuously added to the rear of squall line, the warm and wet air flow climbed along the rear of inflow, which constantly created new cells and maintai ned the development of storm. In the vertical flow structure, the warm air for t he front side was tilted upwards, and the main part tilled backwards. In the rea r there was the cold air injected and the downward flow formed. The sinking air near the ground diverged, together with the lateral inflow formed the lower gust front, which was the major factor causing the ground destruction. In the horizo ntal flow structure there was an upward motion of convergence at low level and a cyclone rotational flow at the middle level. At high level there was a diverge nce flow. In the dissipating period of squall line, MARC appeared at middle level , which brought strong winds and hail weather. The wind disaster with hail produ ced in the period when the squall line was the strongest and began to weaken. Wh en the echo intensity≥50dBz and vertical liquid water content ≥35 kg·m- 2, the meso cyclone is favorable for generating of hail and strong wind. The emerg ence of outflow border reflected that the strong sinking flow in the rear of stro ng echo is a precursor of the disastrous wind.
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李淑玲,刁秀广,朱敏,刘爱荣,2009.一次飑线过程多普勒雷达资料分析[J].气象,35(3):60-65.
Li Shuling,Diao Xiuguang,Zhu Min,Liu Airong,2009.Analysis on the Feature of Doppler Radar Data about a Squall Line Process[J].Meteor Mon,35(3):60-65.