2016—2021年5—10月辽宁省降水量时空分布精细化特征分析

doi:10.3969/j.issn.1673-503X.2024.04.007

Abstract

Abstract:

Utilizing hourly high-density precipitation observation data from May to October during 2016-2021 in Liaoning province, this study analyzed the spatio-temporal distribution characteristics of precipitation processes, short-term heavy precipitation events, and extreme short-term heavy precipitation events. The K-means clustering method was applied to classify the spatial distribution of cumulative precipitation hours during short-term heavy precipitation events in the flood season. The results indicated that short-term heavy precipitation events (hourly precipitation ≥20 mm) and extreme short-term heavy precipitation events (hourly precipitation≥99.9th percentile of historical precipitation at the station) are significantly influenced by topography. High-frequency areas of short-term heavy precipitation are primarily in the southeastern coastal regions of Liaoning province, the coastal plains and areas with higher elevation in western Liaoning province, and the windward slopes in southeastern Liaoning province. Precipitation during the flood season in Liaoning province is affected by monsoon circulation, exhibiting distinct seasonal variations. The maximum average precipitation and precipitation frequency occur in July and August, and mainly concentrate from afternoon to night. Considerable regional differences are found in the frequency of short-term heavy precipitation events across Liaoning province, while the regional differences in extreme short-term heavy precipitation events are relatively minor.

Key words: The number of cumulative hours, K-means clustering, Short-term heavy precipitation, High-density automatic weather stations

CLC Number:

P468.0⁺24

Ping LI, Chuanlei CHEN, Yu CHEN, Dan NIU, Shuo LIU, Anqi NIE, Shaoyong ZHANG. Analysis of spatio-temporal characteristics of precipitation in Liaoning province from May to October during 2016-2021[J]. Journal of Meteorology and Environment, 2024, 40(4): 54-63.

Figures/Tables 8

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Analysis of spatio-temporal characteristics of precipitation in Liaoning province from May to October during 2016-2021

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