干旱区研究2025，Vol.42Issue(12)：2166-2178,13.DOI:10.13866/j.azr.2025.12.02
2013-2022年新疆巴州北部暖季降水日变化特征
Diurnal variation characteristics of warm-season precipitation in northern Bazhou of Xinjiang from 2013 to 2022
摘要
Abstract
In the arid regions of Xinjiang,warm-season precipitation exhibits strong spatial locality and pro-nounced intermittency.Understanding its diurnal cycle is crucial for improving high-resolution regional precipita-tion forecasts.Using hourly precipitation records from 17 automatic weather stations in northern Bazhou Prefec-ture(Bazhou),Xinjiang,for the period 2013-2022,together with ERA5 reanalysis data,this study systematically examines the diurnal variation characteristics of warm-season(May-September)precipitation.The results reveal that:(1)Both precipitation amount and frequency show a distinct bimodal diurnal pattern,with primary peaks from 02:00 to 06:00 and 16:00-22:00,and a pronounced minimum around noon(12:00).The timing of precipita-tion events demonstrates a west-to-east propagation pattern.(2)In the Yanqi Basin,long-duration precipitation events(>6 h)dominate,contributing the largest fraction to total precipitation(38.7%).In contrast,short-duration events(1-3 h)prevail in the Kuiwulun area,accounting for more than 50%of the total.Medium-duration precipi-tation(4-6 h)contributes 20%-40%in both regions.(3)Precipitation across different intensity categories exhib-its a characteristic"nighttime primary peak and afternoon-to-evening secondary peak"pattern.For drizzle,the maximum precipitation amount occurs between 00:00 and 05:00,while its frequency peaks from 17:00 to 05:00.Light rain displays concurrent peaks in amount and frequency at 03:00-04:00,contributing most to the total pre-cipitation(38.8%).Moderate and heavy precipitation events have their primary and secondary peaks at 05:00 and 18:00,respectively,with a contribution of 30.1%.(4)The diurnal distributions of precipitation amount and fre-quency are markedly nonuniform,with concentrations mainly during 02:00-07:00 and 14:00-19:00.The differ-ences between the secondary peak phases of precipitation amount and frequency reflect the joint influence of oro-graphic forcing and thermally driven circulations over the region.关键词
日变化/小时降水量/降水频次/降水持续时间/新疆Key words
diurnal variation/hourly precipitation/precipitation frequency/precipitation duration/Xinjiang引用本文复制引用
CHEN Yanli,YAO Junqiang,XIAO Tiangui,YANG Xian..2013-2022年新疆巴州北部暖季降水日变化特征[J].干旱区研究,2025,42(12):2166-2178,13.基金项目
新疆科技创新团队(天山创新团队)项目(2022TSYCTD0007) （天山创新团队）
新疆生产建设兵团第二师强青科技领军人才计划(2023HZ0105) （2023HZ0105）
