内蒙古河套地区一次对流暴雨的中尺度对流系统演变特征

doi:10.13866/j.azr.2022.06.04

Abstract

Abstract:

Based on conventional observation data, FY4A satellite cloud pictures, Doppler radar data, and reanalysis data, the occurrence and various characteristics of the mesoscale convective system (MCS) of the heavy rain process in the Hetao area of Inner Mongolia on July 19, 2018, were analyzed. The results show that: (1) The stable and less moving subtropical high, the 500hPa upper trough, the low-level shear line, the low-level southwest jet, the 300 hPa upper-altitude jet, and the surface low pressure provide a favorable circulation background. (2) The stable low-level southwest jet provides enough water vapor transport. Pseudo-equivalent potential temperature high energy tongue, deep warm cloud layer, high-intensity CAPE, cold advection intrusion behind the upper trough, and the unstable air layer together provide better environmental conditions for the heavy rainstorm. (3) The two successively developed MCS caused the heavy rain process. The convective rainstorm is mainly caused by the slow movement of the east-west MCS along the Yinshan Mountains, 20 mm·h^-1 heavy rain appears at the edge of upwind cloud clusters and the strong TBB gradient areas. (4) The east-west echo moves slowly along the direction of the echo wavelength axis. The strong echo moves slowly from west to east to form a significant “train effect,” causing continuous heavy rain for more than five hours. The north-south direction echo lasts longer, but its moving direction is vertical to the direction of the echo wavelength axis, and the moving speed is faster, so the intensity of the rainstorm produced is weaker than the east-west direction. (5) The surface convergence line is the main factor that triggered the MCS occurrence and development, Hetao area complex terrain, and the pulsation of the low-level jet both promote the effect. The almost overlapping distribution of the surface mesoscale convergence line and the Yinshan Mountains are favorable to the continuation of rain and the convective rainstorm.

Key words: convective rainstorm, MCS, train effect, Hetao area, Inner Mongolia

HUANG Xiaolu,LI Ruiqing,LI Linhui,LIN Hongjie,YAO Lebao. Various characteristics of the mesoscale convection system of a convective rainstorm in the Hetao area of Inner Mongolia[J].Arid Zone Research, 2022, 39(6): 1728-1738.

Figures/Tables 8

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Various characteristics of the mesoscale convection system of a convective rainstorm in the Hetao area of Inner Mongolia

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