2018—2021年渤海中西部海域雷暴大风时空分布特征

doi:10.3969/j.issn.1673-503X.2024.02.011

Abstract

Abstract:

Using observation data from automatic meteorological stations, ADTD lightning positioning, and Doppler radar, we analyzed the intensity, spatiotemporal distribution and synoptic patterns of thunderstorm gust over the central and western Bohai Sea from 2018 to 2021. Based on the ERA5 reanalysis data and observation data from automatic meteorological stations, we also studied the characteristics and reference thresholds of physical quantities before the occurrence of widespread thunderstorms gust. The results indicate that the thunderstorm gust in the central and western Bohai Sea were mainly within the levels of 8 to 9, mostly occurred in the western and southern coastal areas of Bohai Sea, in June and July and in the early night. Among the thunderstorm gust events that lasted for 4 hours or more, the widespread thunderstorm gust events accounted for 86%. The synoptic systems at 500 hPa triggering thunderstorm gust were classified as the cold vortex type (46%), the high-level trough type (37%), the subtropical high edge type (12%), and the northwesterly flow type (5%). There was an obvious dry layer in the middle troposphere before the occurrence of widespread thunderstorm gust. When applying physical parameter thresholds for forecasting, the impact of synoptic systems and seasonal climate features needs to be considered.

Key words: Synoptic system, Thunderstorm gust, Physical parameter

CLC Number:

P457.5/P457.9

Tao ZUO,Ke WANG,Xiaolei SUN,Yanan WANG. Spatiotemporal distribution of thunderstorm gust in the central and western Bohai Sea from 2018 to 2021[J]. Journal of Meteorology and Environment, 2024, 40(2): 86-95.

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物理量		CAPE/(J·kg^-1)	K/℃	LI/℃	T_{850-500 hPa}/℃	0~6 km垂直风切变/(m·s^-1)
逐月	5月	≥206	≥30.7	≤-0.2	≥30.2	≥23.8
	6月	≥760	≥30.9	≤-3.5	≥30.3	≥25.2
	7月	≥2304	≥36.9	≤-4.0	≥25.6	≥13.8
	8月	≥2913	≥35.6	≤-4.7	≥25.5	≥13.3
天气型	高空槽	≥709	≥32.5	≤-3.6	≥30.2	≥15.9
	冷涡	≥1130	≥34.7	≤-2.0	≥28.2	≥16.1
	副高边缘	≥2764	≥38.9	≤-4.5	≥25.0	≥12.2

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Spatiotemporal distribution of thunderstorm gust in the central and western Bohai Sea from 2018 to 2021

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