干旱气象 ›› 2021, Vol. 39 ›› Issue (1): 87-95.

• 论文 • 上一篇    下一篇

成都两次暴雨期间风廓线雷达观测的低空风场特征

王佳津1,2,张琪1,2,张涛2,3,龙柯吉1,2,师锐1,2#br#

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  1. (1.四川省气象台,四川成都610072;2.中国气象局成都高原气象研究所,
    高原与盆地暴雨旱涝灾害四川省重点实验室,四川成都610072;3. 四川省成都市气象局,四川成都610071)

  • 出版日期:2021-03-01 发布日期:2021-03-10
  • 作者简介:王佳津(1986— ),女,黑龙江哈尔滨人,硕士,主要从事高影响天气特征机理研究及模式释用分析. E-mail:w_jiajin@163.com。
  • 基金资助:
    中国气象局预报员专项(CMAYBY2019-098、CMAYBY2020-109)和高原与盆地暴雨旱涝灾害四川省重点实验室青年专项(SCQXKJQN2020024)共同资助

Low-level Wind Field Characteristic Observed by Wind Profile Radar During Two Rainstorm Processes in Chengdu#br#
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WANG Jiajin1,2, ZHANG Qi1,2, ZHANG Tao2,3, LONG Keji1,2, SHI Rui1,2#br#

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  1. (1. Sichuan Provincial Meteorological Observatory, Chengdu 610072, China;
    2. Chengdu Institute of Plateau Meteorology, CMA, Heavy Rain and Drought-Flood Disasters
     in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China;
    3. Chengdu Meteorological Service of Sichuan Province, Chengdu 610071, China)

  • Online:2021-03-01 Published:2021-03-10

摘要: 利用风廓线雷达高时空分辨率资料,对2018年7月成都两次暴雨期间低空风场特征进行分析。结果表明:(1)强降水开始前,中低层(2~4 km)偏南风增强,甚至可以达到急流强度,低空急流指数峰值出现时间较短时强降水开始时间有一定提前量;(2)短时强降水开始于中低层冷空气入侵之时,0.5 km高度附近的风场扰动出现时间较强降水开始时间提前约1 h;(3)两次强降水过程显示,南风增强产生的强垂直切变有利于强降水发生,而北风增强产生的强切变使得降水减弱。

关键词: 关键词:成都, 风廓线雷达, 暴雨, 低空急流, 风切变

Abstract:  Based on the high temporal and spatial resolution data of wind profile radar, the characteristics of the low-altitude wind field during the two rainstorm processes in Chengdu in July 2018 were analyzed. The results are as follows: (1) Before the start of heavy precipitation, the southward wind of 2-4 km strengthened and even reached the strength of jet stream. The peak value of jet index had a certain advance compared with the beginning time of short-term heavy precipitation. (2) When the short-time heavy precipitation started from the invasion of cold air in the middle and lower layer, the disturbance of wind field near the height of 0.5 km occured about 1 h earlier than the start time of heavy precipitation. (3) The two heavy precipitation processes showed that the strong vertical shear generated by strengthening of the south wind was conducive to the occurrence of heavy precipitation, while the strong shear generated by strengthening of the north wind weakened the precipitation.




Key words: Key words: Chengdu, wind profiler, rainstorm, low-level jet, wind shear