四川盆周山地暖季单站暴雨事件的精细特征OACSTPCD
Fine characteristics of single station rainstorm events in warm season in mountain areas around Sichuan Basin
利用四川省2010-2019年2 165个气象站逐小时降水资料,分区统计了四川盆周山地暖季(5-9月)单站暴雨事件的精细特征.结果表明:(1)四川省单站暴雨事件频数在川西山地与川西南山地呈密集的带状分布.川西与川西南山地通常在降水开始不久就达到雨量最大值,而川东北山地的峰值时间集中在暴雨事件中段.(2)盆周山地的暴雨系统整体呈自南向北由前半夜向后半夜传播的特征.川西南山地和川东北山地的暴雨系统分别呈现较弱的自南向北和自西向东传播,而川西山地的暴雨系统则存在明显的自西向东的传播特征.(3)长历时暴雨事件的峰值出现时间略落后于短历时暴雨事件.暴雨持续时间在空间上存在显著的经向差异,大值区主要位于川西山地和川东北山地一带,暴雨雨量、频次和峰值基本不随持续时间变化,但川西南山地的暴雨峰值则随持续时间的加长而推迟.(4)在四川省大部区域,单站暴雨事件的降水量、频次和强度均表现出随海拔高度升高而减小的特征.在成都平原西南部、东部以及川东北山地,夜间暴雨事件持续时间越长,降水量和频次在较高海拔越易出现最大值.
Based on the hourly precipitation data of 2 165 meteorological stations in Sichuan Province from 2010 to 2019,the fine characteristics of single station rainstorm events in the warm season(May-September)of the mountainous areas around Sichuan Basin were statistically analyzed.Results show that:(1)the frequency of single station rainstorm events in Sichuan Province is densely distributed in the mountainous areas of western and southwestern Sichuan.The western and southwestern mountains of Sichuan usually reach the maximum rainfall shortly after the beginning of rainfall,while the peak time of the northeastern mountains of Sichuan is concentrated in the middle of rainstorm events.(2)The rainstorm system in the mountain area around the basin presents the characteristics of propagation from south to north from early mid-night to late mid-night.The torrential rain systems in the mountains of southwest and northeast Sichuan show weak propagation from south to north and from west to east respectively,while the torrential rain systems in the mountains of West Sichuan show obvious propagation from west to east.(3)The peak time of long-duration rainstorm events is slightly behind that of short-duration rainstorm events.There is a significant meridional difference in the duration of torrential rain in space.The large value area is mainly located in the western and northeastern Sichuan mountains.The peak value of torrential rain amount and frequency does not change with the duration,but the peak value of torrential rain in southwestern Sichuan is delayed with the increase of duration.(4)In most areas of Sichuan Province,the precipitation,frequency and intensity of single station rainstorm events show the characteristics of decreasing with the increase of altitude.In the southwest of Chengdu Plain,the east of Chengdu Plain and the mountains of northeast Sichuan,the longer the duration of nighttime rainstorm events is,the more favorable it is for precipitation and frequency to reach the maximum at higher altitude.
周芳弛;李国平
成都信息工程大学大气科学学院,成都 610225||中南航空交通管理局,广州 510000成都信息工程大学大气科学学院,成都 610225
大气科学
四川盆周山地单站暴雨事件暖季日变化海拔高度
mountain areas around Sichuan basinsingle station rainstorm eventwarm seasondaily variationaltitude
《气象科学》 2024 (003)
431-441 / 11
国家自然科学基金资助项目(42175002;42075013;41975058);四川省自然科学基金资助项目(2023NSFSC0242)
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