摘要
通过研究甘肃庆阳地区连续性暴雨的成因及特征,为该地区的灾害性暴雨天气预报预警提供参考依据,本研究利用常规气象资料和诊断分析技术分析了庆阳地区2017年8月17—22日连续性暴雨过程。结果表明:(1)连续暴雨前期降水历时短,强度大,分布不均匀,突发性明显;中期持续时间较长,范围广,局地降水强度强,累计降水量较大;后期持续时间长,范围广,分布均匀,累计降水量大。(2)低空急流低层抬升和高空急流抽吸造成了连续性暴雨的发生发展。(3)中尺度云团较为活跃,组织化程度高,持续时间长。(4)前期大气处于极度高能不稳定状态,中期不稳定能量有所下降,后期不稳定能量急剧下降。(5)前期比湿突增明显,跃变值达4 g/kg,且比中后期大。
This paper aims to study the causes and characteristics of the continuous rainstorm in Qingyang area of Gansu,and provide references for the severe rainstorm forecast.The continuous rainstorm process in Qingyang from August 17 to 22,2017 was analyzed by conventional meteorological data and diagnostic analysis technology.The results showed that:(1)the precipitation duration of the continuous rainstorm in earlier stage was short with high intensity,uneven distribution,and obvious outburst;that in the middle duration was long with wide scope,strong local precipitation intensity,and large accumulative precipitation;in the later stage,it had a long duration with wide range,uniform distribution and large accumulative precipitation;(2)low layer uplifting of the low level jet and high-jet suction caused the development and maintenance of the rainstorm;(3)the mesoscale cloud cluster was active,with high degree of organization and long duration;(4)in the earlier stage,atmosphere was in a state of extreme high energy instability,in the middle stage,the unstable energy decreased,and in the later stage,unstable energy decreased sharply;(5)specific humidity increased obviously in the earlier stage,jump value reached 4 g/kg,which was larger than that of the other two stages.
作者
张峰
路亚奇
刘翔
赵玉娟
Zhang Feng;Lu Yaqi;Liu Xiang;Zhao Yujuan(Qingyang Meteorological Bureau in Gansu,Qingyang Gansu 745000)
出处
《中国农学通报》
2019年第29期123-128,共6页
Chinese Agricultural Science Bulletin
基金
甘肃省气象局科研项目“EC细网格在短时暴雨预报中的释用研究”(Ms2019-12)
庆阳市气象局科研项目“用E-P通量分析庆阳干旱灾害的特征及评估方法”(201505)
关键词
连续性暴雨
副高
环流形式
中尺度对流云团
continuous rainstorm
subtropical high
circulation situation
mesoscale convective cloud cluster
