云娜台风加强及特大暴雨过程的多普勒速度场特征研究

浙江省温州市CINRAD-SA雷达站因其较好的地理位置,详细探测了在有效观测范围内云娜台风发展、演变、近海加强加速、登陆及西行衰亡的全部过程。利用其获取的强度场与速度场资料,结合台风定位资料及自动站雨量资料,分析了台风加强及特大暴雨时段的多普勒雷达强度场、速度场特征,发现多普勒雷达能捕捉到远距离台风的加强信息。这次台风造成了浙江省多场暴雨过程,多普勒速度场资料揭示了在台风这一暖心低压的背景下,高空西南急流的脉动、高空辐散的加强、台风北侧弱冷空气的触发与特大暴雨的良好对应关系。

Research of the Characters of Doppler Velocity in the Typhoon Rananim's Strengthening and Heavy Rain

CINRAD/SA Doppler radar at Wenzhou City, Zhejiang province, made use of its advantaged location to probe the whole process of the development, evolvement, strengthening and speed-up near the seacoast, debarkation and declining of the 0414 Typhoon Rananim. The paper analyses the characters of the intensity field and the Doppler speed field of the typhoon detected by the radar, and discovers that the radar can catch the information of typhoon's strengthening in long-distance by using of those data probed by the radar and the data of typhoon-positioning and auto-noting rain amount. Heavy rains arose in Zhejiang province. The data of radar's Doppler velocity field reveals that the pulsation of the high altitude southwest jet, the strengthening of the upper divergence and triggering of the weak cold air near the northern side of the typhoon have a positive correlation with the special heavy rain on the background of the warm-core low pressure.