2020年湖北省两次低涡型极端降水气象因子异常特征对比

doi:10.3969/j.issn.1673-503X.2022.06.003

Abstract

Abstract:

Based on the daily NCEP/NCAR reanalysis data and other conventional observation data, the abnormal characteristics of meteorological factors of two extreme low-vortex precipitation in Hubei province on June 27 and July 7, 2020, were compared and analyzed.The results show that the two processes both occurred during the Meiyu period, and the two-trough and one-ridge pattern appeared over the mid and high latitudes at 500 hPa, with low vortices being formed in the lower layers.The vapor in the whole layer showed obvious persistent abnormal characteristics, and the central value was 2.5 standard deviations higher than the climate average.The extreme precipitation occurred mainly in the central and western parts of Hubei province on June 27 was a convective precipitation process in the warm front area under the combined dynamic action of the southwest vortex and the surface thermal low pressure.The central intensity of the ultra-low level jet stream was three standard deviations stronger than the climatic average, and the lowest value of the development of the warm low was two standard deviations lower than the climatic average, with the convective available potential energy (CAPE) value reaching more than 1000 J·kg^-1 and appearing 1.5 standard deviations higher than the climatic average.The positive vorticity and negative divergence of the southwest vortex were abnormally strong and superposition at the same time, forming a strong upward movement.The extreme precipitation occurred mainly in the central and eastern parts of Hubei province on July 7 was a frontal precipitation process formed by the combined dynamic action of a low vortex and ground stationary front in Jianghan plain.The anomalously strong cold high in North China, which was about one standard deviation above the climatic average, leads to the formation of a significant Meiyu front on the ground.The strong convergence in front of the low vortex in Jianghan plain is superimposed with the static front on the ground, resulting in abnormally strong dynamic conditions, which remain stable for about 12 hours.

Key words: Meiyu, Low vortex, Convective available potential energy(CAPE)

CLC Number:

P458.1⁺21.1

Liang-peng DONG,Ping-ping ZHANG. Comparison of abnormalism of meteorological factors on two extreme precipitations triggered by low vortex in Hubei province in 2020[J]. Journal of Meteorology and Environment, 2022, 38(6): 20-28.

Figures/Tables 6

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指标	6月27日24 h降水量		7月7日24 h降水量
指标	国家站	区域站	国家站	区域站
≥250 mm站数/站	1	23	1	20
≥100 mm站数/站	16	473	15	344
最大降水量/mm	272.6	318.5	331.9	351.5
达到极端降水标准站数/站	29	—	31	—
突破历史极值站数/站	4	—	2	—

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Comparison of abnormalism of meteorological factors on two extreme precipitations triggered by low vortex in Hubei province in 2020

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