2020—2021年沈阳地区4次短时强降水过程的大气可降水量变化对比分析

doi:10.3969/j.issn.1673-503X.2023.02.004

Abstract

Abstract:

Based on the ECMWF (European Center for Medium-Range Weather Forecasts) ERA5 reanalysis data, GPS (Global Position System) precipitable water vapor observations, and conventional observation data, the variation characteristics of atmospheric PWV (Precipitable Water Vapor) and water vapor flux during four short-time heavy rainfall processes from 2020-2021 under different weather systems in Shenyang were analyzed. The results show that the duration of water vapor accumulation is closely related to the corresponding weather system.PWV can be maintained at a relatively high level in the heavy rainfall process caused by the periphery of the subtropical high system, and the water vapor growth rate can reach 1.1 mm·h^-1.In addition, the occurrence period of heavy rainfall corresponds with the peak of PWV, but the peaks of the two do not coincide completely.When short-time heavy rainfall occurs, the atmospheric precipitable water at Shenyang station reaches more than 38 mm.After the end of heavy rainfall, PWV weakens obviously.

Key words: Short-time severe rainfall, Ground-based GPS, Water vapor flux

CLC Number:

P458.1⁺1

Shuang XU, Peng-yu HU, Yue JIA, Jin-song CUI, Lei YANG, Chong LI, Dong-dong WANG, Wan-ting HOU. Comparative analysis of changes in atmospheric precipitable water during four short-time heavy rainfall processes in Shenyang from 2020 to 2021[J]. Journal of Meteorology and Environment, 2023, 39(2): 28-34.

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References 25

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天气系统	累积时间/h	水汽累积过程平均增速/(mm·h^-1)	降水集中出现时段	降水结束后可降水量变化	短时强降水出现时大气可降水量/mm
冷涡配合副热带高压	10	2.20	可降水量峰值阶段	锐减	42.0
冷涡低槽	17	0.78	可降水量峰值阶段	缓慢减少	38.4
台风减弱环流北上第一阶段	19	0.74	可降水量峰值阶段	明显减少	57.8
台风减弱环流北上第二阶段	11	0.73	可降水量峰值阶段	快速减少	47.2
短波槽配合副热带高压	19	1.10	可降水量峰值阶段	快速减少	59.0

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Comparative analysis of changes in atmospheric precipitable water during four short-time heavy rainfall processes in Shenyang from 2020 to 2021

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