那曲地区浅薄残余层对对流边界层发展的影响  

Effects of Shallow Residual Layer on the Development of the Convective Boundary Layer in Naqu Area

作　　者：景慧 赵林 孟宪红 韩博 李照国 陈昊 胡泽勇 张剑锋[5] JING Hui;ZHAO Lin;MENG Xianhong;HAN Bo;LI Zhaoguo;CHEN Hao;HU Zeyong;ZHANG Jianfeng(Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guangdong Province Key Laboratory for Climate Change and Nature Disaster Studies,School of Atmospheric Sciences,Zhongshan University,Zhuhai 519082,Guangdong,China;Southern Laboratory of Ocean Science and Engineering(Zhuhai),Zhuhai 519082,Guangdong,China;Lanzhou Institute of Physics,Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou 730000,Gansu,China)

机构地区：[1]中国科学院西北生态环境资源研究院/中国科学院寒旱区陆面过程与气候变化重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]中山大学大气科学学院,广东省气候变化与自然灾害研究重点实验室,广东珠海519082 [4]南方海洋工程与技术实验室(珠海),广东珠海519082 [5]兰州空间技术物理研究所,真空技术与物理国家级重点实验室,甘肃兰州730000

出　　处：《高原气象》2020年第6期1318-1328,共11页Plateau Meteorology

基　　金：国家自然科学基金项目(41822501,91837209,41975012,41930759);国家重点研发计划项目(2016YFB0501303)。

摘　　要：利用那曲站2016年夏季探空数据及其他气象观测数据,对8月25日和26日那曲大气边界层结构进行了研究。发现8月25日和26日白天晴空对流边界层的发展过程存在显著差异。8月25日和26日14:00(北京时,下同)的边界层高度分别为1244 m和1966 m,而25日和26日08:00-14:00累计的地表感热通量分别为605 W·m-2和650 W·m-2。也就是说,在地表感热加热的累计通量的差异仅为7%的条件下,白天晴空对流边界层高度的差异能达到60%。进一步分析发现,浅薄残余层的存在可能是造成边界层高度差异的主要原因。本文还初步评估了欧洲中期天气预报中心最新一代高时空分辨率的再分析数据ERA5在那曲地区的适用性。结果表明,8月26日的ERA5再分析数据可以基本再现位温、风速的垂直分布特征,边界层高度也与观测比较一致,但峰值时间存在滞后性。In this paper,the atmospheric boundary layer structure of Naqu station on 25 and 26 August 2016 is analyzed by using the radiosonde and other meteorological observation data.The results show that the boundary layer height at 14:00(Beijing Time,after the same).on August 25 and 26 were 1244 m and 1966 m respectively,while the accumulated surface sensible heat fluxes during 08:00-14:00 were 605 W·m-2 and 650 W·m-2 respectively.In other words,the difference of the height of convective boundary layer in clear sky can reach 60%when the difference of accumulated surface sensible heat fluxes is only 7%.Further analysis shows that the existence of shallow residual layer may be the main reason for the difference of boundary layer development between the two days.The existence of the shallow residual layer potentially contributes the sensible flux heating the atmosphere in the boundary layer.However,the latest reanalysis data from ECMWF,i.e.,ERA5 could not capture the existence of the shallow residual layer,whilst it could reproduce the vertical distribution characteristics of the potential temperature and wind speed basically.

关 键 词：残余层 对流边界层 风切变 能量通量 

分 类 号：P404[天文地球—大气科学及气象学]