祁连山气流场特征研究  

Characteristics of airflow field in Qilian mountains

作　　者：王潇雅 黄颖 毛文茜 张文煜[1,2,3,4] 张国庆 WANG Xiaoya;HUANG Ying;MAO Wenqian;ZHANG Wenyu;ZHANG Guoqing(College of Atmospheric Sciences,Key Laboratory for Semi-Arid Climate Change of the Ministry of Education,Lanzhou University,Lanzhou 730000;Key Laboratory for Cloud Physics of China Meteorological Administration,Beijing 100081;School of Geoscience and Technology,Zhengzhou University,Zhengzhou 450001;China Global Atmosphere Watch Baseline Observatory,Xining 810001,China)

机构地区：[1]兰州大学大气科学学院,半干旱气候变化教育部重点实验室,兰州730000 [2]中国气象局云雾物理环境重点开放实验室,北京100081 [3]郑州大学地球科学与技术学院,郑州450001 [4]中国大气本底基准观象台,西宁810001

出　　处：《干旱区资源与环境》2021年第7期77-83,共7页Journal of Arid Land Resources and Environment

基　　金：西北区域人工影响天气能力建设项目(ZQC-R18208);第二次青藏高原综合科学考察研究项目(2019QZKK0104);国家自然科学基金项目(41875085,41630421)资助。

摘　　要：利用欧洲中期数值预报中心ERA5再分析数据集2018-2019年1h地面10m和500hPa风速资料及2019年7月-2020年7月的降水实测资料和同期ERA5中的地面10m风速及500hPa风速资料,分析了祁连山地区地面气流场和500hPa气流场的特征分型,并统计分析了降水过程的高低空气流场配置。结果表明:地面气流场和高空500hPa气流场均可依据气流来向分为五种类型:偏南气流型、西北及偏北气流型、西南及偏西气流型、辐合辐散气流型、东北及偏东气流型;祁连山区全年出现频率最高的地面气流场为西南及偏西气流型,出现次数占全年的48.88%;出现频率最高的500hPa气流场为西北及偏北气流型,出现次数占全年的46.70%;试验期间41次降水过程的高低空气流场配置中地面辐合辐散气流型和500hPa西北及偏北气流型的配置最多,出现频率占34.15%。Using the 1 h ground 10 m and 500 hPa wind speed data(2018-2019)in reanalysis data set of European Medium-term Numerical Prediction Center ERA5,and the precipitation data from July 2019 to July 2020 and the ground 10 m wind speed and 500 hPa wind speed data in the same period in ERA5,the characteristics of the surface airflow field and 500 hPa airflow field in the Qilian mountains were analyzed,and the high and low air flow field configurations during the rainfall process were statistically analyzed.The results show that the surface airflow field and the upper-altitude 500 hPa airflow field can be divided into five types according to the airflow direction:southerly airflow,northwest and northerly airflow,southwesterly and westerly airflow,convergent divergent airflow,northeast and easterly airflow patterns;the most frequently occurred surface airflow patterns throughout the year in the Qilian mountains are southwest and westward airflow patterns,accounting for 48.88% of the annual occurrence;the 500 hPa airflow patterns with the highest occurrence frequency are northwest and northerly airflow patterns.The frequency accounts for 46.70% of the whole year.during the 41 precipitation processes during the test period,the high and low air flow field configurations had the most surface convergent divergent airflow and 500 hPa northwest and northerly airflow configurations,with a frequency of 34.15%.

关 键 词：气流场 特征 ERA5 祁连山 

分 类 号：P43[天文地球—大气科学及气象学]