Analysis of Radar Echo Characteristics of Short-term Heavy Precipitation Weather with Different Circulation Pattern in East Gansu Province

  • Xiangwei KONG ,
  • Jiancai YANG ,
  • Hong LI ,
  • Yi YANG
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  • <sup>1.</sup>College of Atmospheric Sciences,Lanzhou University/Joint Center of Research and Training for Weather and Climate Prediction,Lanzhou 730000,Gansu,China;<sup>2.</sup>Lanzhou Central Meteorological observatory,Lanzhou 730020,Gansu,China;<sup>3.</sup>Institute of Arid Meteorology,China Meteorology Administration,Lanzhou 730020,Gansu,China

Received date: 2020-04-29

  Online published: 2021-10-28

Abstract

In order to try to establish the connection between large-scale synoptic situation configuration patterns and the medium and small scale radar characteristics, 15 regional short-term heavy precipitation weather processes from 2010 to 2015 in East Gansu Province are used.These short-term heavy precipitation synoptic situation configuration patterns are divided into three patterns: eastward moving plateau low trough pattern, edge of subtropical high pattern, and northwest airflow pattern according to the difference of the main influence system in the 500 hPa.The common characteristics of weather radar echo structure and its’ evolution under different patterns are also analyzed.The results show that: (1) The radar echo of the eastward moving plateau low trough pattern is usually a mid-β-scale stratified mixed band echo of NNE-SSW trend, which is consistent with the trend and position of the low-level jet axis on the right side of 700 hPa cold shear line.The band echo is mostly formed in southeast Gansu, and the southerly low-level jet has an important influence on its propagation direction, which makes it maintain for 3~4 hours, even 5~6 hours, often accompanied by "train effect".The radar echo center of mass is low, warm cloud precipitation is dominant, and with high precipitation efficiency.(2) The radar echo edge of subtropical high pattern is usually a mid-β-scale narrow band echo of NE-SW direction located near the ground front, which is slightly ahead of 700 hPa cold shear line.This kind of radar echo is usually generated when the rapid moved cold air (cold front) intrudes into the central area of Gansu Province.When the cold front moves to the southeast of Gansu Province, the radar echo gradually evolves into the characteristics that of eastward moving plateau low trough pattern.However, its speed of moving southeast is faster than eastward moving plateau low trough pattern.(3) The radar echo of northwest airflow pattern is relatively scattered and localized, it is mainly a mid-γ-scale block echo.Either short life cycle convective cell generates and eliminates, or multi-cell storm organizes, combinates and reinforces.The development of convective cell is more vigorous than the former two patterns, belongs to deep convection.

Cite this article

Xiangwei KONG , Jiancai YANG , Hong LI , Yi YANG . Analysis of Radar Echo Characteristics of Short-term Heavy Precipitation Weather with Different Circulation Pattern in East Gansu Province[J]. Plateau Meteorology, 2021 , 40(5) : 1057 -1070 . DOI: 10.7522/j.issn.1000-0534.2020.00084

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