辽东湾北部海风锋与阵风锋碰撞形成的一次雷暴大风天气过程分析

doi:10.3969/j.issn.1673-503X.2023.05.003

Abstract

Abstract:

Based on the dual polarization Doppler weather radar high altitude observation data, encrypted automatic station data, and ERA5 reanalysis data in Yingkou of Liaoning province, a thunderstorm gale process formed by the collision of sea breeze front and gust front in the northern Liaodong Bay on May 28, 2021, was analyzed.The results show that the mesoscale sub-cold front moves southward and forms a surface convergence line that confronts the northerly wind and the southwest sea breeze, which triggers strong convection in conjunction with dryline.Before the collision between the sea breeze front and the gust front, the echo centroid of the individual in the mature stage of the upstream sinks, and the sinking outflow promotes the rapid development and enhancement of the downstream monomer.The cold pool density current plays a key role in triggering and enhancing the downstream cumulus convection.The surface temperature is increased by the daytime clear sky radiation warming, which is conducive to the accumulation of convective effective potential energy.The unstable stratification and strong vertical wind shear in the Panjin region lead to the continuous development and strengthening of the southern pressure of the convective system.A conceptual model of thunderstorms generated by the frontal collision of the sea breeze front and gust front in this area is initially established.The northern sea breeze front collides with the gust front generated by southward convection in Liaodong Bay, and the air climbs northward along the gust front.Under the influence of the northward guiding flow, the northward moving component of the convective system is canceled out, and the southward convective system continues to develop under better environmental conditions.This will maintain the strength of the convection and affect the downstream areas of thunderstorms and gales.

Key words: Gust Front, Sea Breeze Front, Collision

CLC Number:

P425.4

Chao JIANG,Kuizhi CAI,Lei YANG,Shiteng CAO,Yu CHEN,Yiwen WANG,Weilong BAN. Analysis of a thunderstorm gale process formed by the collision of sea breeze front and gust front in the northern Liaodong Bay[J]. Journal of Meteorology and Environment, 2023, 39(5): 19-27.

Figures/Tables 12

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地点	SHR₆	SHR₃	SHR₁	K	CAPE	DCAPE	T₈₅₀-T₅₀₀	LCL	Q₈₅₀	RH850	RH500	PW
盘锦	13.63	11.01	3.67	32.7	448.27	698.77	31.46	1864	6.22	77.82	36.57	20.34
通辽	6.39	4.6	2.36	24.28	449.36	726.14	31.69	2300	4.57	55.91	48.43	15.53

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Analysis of a thunderstorm gale process formed by the collision of sea breeze front and gust front in the northern Liaodong Bay

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