新疆天山山区夏季极端降水的日变化特征  

Diurnal Variation of Summer Extreme Precipitation in TianshanMountains of Xinjiang

作　　者：郭玉琳 赵勇[3] 张同文[4] 姚俊强[4] 顾张杰 GUO Yulin;ZHAO Yong;ZHANG Tongwen;YAO Junqiang;GU Zhangjie(Xinjiang Climate Center,Urumqi 830002,China;Altay Meteorological Bureau,Altay 836500,China;School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,China)

机构地区：[1]新疆气候中心,新疆乌鲁木齐830002 [2]阿勒泰地区气象局,新疆阿勒泰836500 [3]成都信息工程大学大气科学学院,四川成都610225 [4]中国气象局乌鲁木齐沙漠气象研究所,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2023年第2期44-51,共8页Desert and Oasis Meteorology

基　　金：国家重点研发计划专项(2018YFC1507103);四川省科技计划(2020JDJQ0050);国家自然科学基金(41875102);新疆气象局青年基金(QN202216)。

摘　　要：基于天山山区11个国家气象站2012—2018年夏季(6—8月)逐小时降水资料,使用百分位法计算极端降水阈值,分析极端降水特征量(包括极端降水量、极端降水频次、极端降水强度、极端降水贡献和极端降水量最大值)的日变化特征,揭示极端降水与海拔高度的关系。结果表明:87°E以东地区,极端降水量最大值出现的时间大致都存在自西向东顺时针变化的特点。极端降水主要以短持续性为主,极端降水贡献和极端降水量最大值的谷值都出现在白天。极端降水与海拔密切相关,总极端降水频次更多发生在高海拔地区,在海拔2 000 m左右存在一个极端降水最大值带。Based on the hourly precipitation data of 11 meteorological stations in Tianshan Mountains in summer(June to August)during 2012-2018,the threshold value of hourly extreme precipitation is calculated by the percentile method,and the characteristics of diurnal variation are revealed,including the amount,frequency,intensity,contribution,and maximum value of extreme precipitation.The relationship between terrain height and extreme precipitation is investigated.The main conclusions are as follows:The time at which the maximum value of extreme precipitation appears in the east of 87°E is roughly clockwise from west to east.Extreme precipitation tends to appear in the form of short persistence,the valley values of both the extreme precipitation contribution and the extreme precipitation maximum value appear during the daytime.The extreme precipitation is related to altitude,total extreme precipitation frequency more occurs at high altitude,and the maximum value belt of extreme precipitation is found at the altitude of about 2000 m.

关 键 词：极端降水量 极端降水频次 极端降水强度 日变化 海拔 

分 类 号：P467[天文地球—大气科学及气象学]