Case Study on the Formation Mechanism of Two Types of Short-term Strong Rainfall Occurred in Gansu Province on 18 June 2013 and 19 June 2014

XU Dongbei; GOU Shang; XIAO Wei; MENG Lixia; SHA Honge; DI Xiaohong; SHI Yanzhao

doi:10.7522/j.issn.1000-0534.2017.00056

2018 , Vol. 37 >Issue 2: 524 - 534

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00056

Case Study on the Formation Mechanism of Two Types of Short-term Strong Rainfall Occurred in Gansu Province on 18 June 2013 and 19 June 2014

XU Dongbei ,
GOU Shang ,
XIAO Wei ,
MENG Lixia ,
SHA Honge ,
DI Xiaohong ,
SHI Yanzhao

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College of Atmospheric Sciences, Chengdu University of Information Technology, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, Sichuan, China;Lanzhou Centre Meteorological Observation, Lanzhou 730020, Gansu, China;Gansu Meteorological Service Center, Lanzhou 730020, Gansu, China

Received date: 2017-02-08

Online published: 2018-04-28

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Abstract

By using "2014·06·18" and "2013·06·19" short-term strong precipitation observation and NCEP 1°×1°reanalysis data, the characteristics of the situation, the configuration of the weather situation, the dynamic thermal characteristics, cloud and radar features for different kinds of strong short-term rainfall were compared and analyzed, which happened in same season and similar climate background at the middle and south parts of Gansu Province. The results show that the formation mechanism have both similarities and significant differences. The rain intensity of the two processes is large, and the former occurred in the case of intense convergence of cold and warm air in the middle and lower level, which accompanied with obvious temperature frontal zone, frontogenesis and the ground cold front activity. It is a kind of short-term strong precipitation of baroclinic frontogenesis. The latter occurred in the strongly developed warm and moist advection in the lower level, the warm and wet advection played a leading role in establishing thermodynamic instability, it is a kind of short time strong precipitation of the warm advection force. The instability index showed that the unstable energy of the former was much larger than that of the latter, and there was convective inhibition, which was conducive to the development of strong convection. The thickness of the wet layer of warm advection forced short-term heavy rainfall was higher than that of oblique pressure front short-term heavy rainfall, and high-level vertical wind shear performance of the latter short-term heavy rainfall was much stronger. The image features of warm advection force was a banded cloud which was quickly move northward along with warm air on 19 June 2013. The image features of oblique pressure front was a comma cloud system which corresponding to the low-level herringbone shaped shear on 18 June 2014. The change and development of cloud system is closely related to the changes of situation field, which is an important reason for the development and changes of precipitation area. Radar reflectivity factor on 19 June 2013 showed that it was a mixed cloud-based mixed precipitation echo, and the echo gradient was small with low center of mass. Radar reflectivity factor on 18 June 2014 was a stratified cloud scattered block convection single echo, and the echo gradient was large with high center of mass, besides, the echo intensity can be developed to very strong. When the core area of the strong reflectivity of 50 dBz is close to 8 km, reached the height of -20℃ layer, and the echo top height reached 12 km at same time, there would be hail there.

Key words： Two types; short-term strong ra; formation mechanism; comparative analysis

Cite this article

XU Dongbei , GOU Shang , XIAO Wei , MENG Lixia , SHA Honge , DI Xiaohong , SHI Yanzhao . Case Study on the Formation Mechanism of Two Types of Short-term Strong Rainfall Occurred in Gansu Province on 18 June 2013 and 19 June 2014[J]. Plateau Meteorology, 2018 , 37(2) : 524 -534 . DOI: 10.7522/j.issn.1000-0534.2017.00056

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