近地面层湍流通量输送相似性及相干结构特征  

Characteristics of turbulent transport similarity and coherent structures in the atmospheric surface layer

作　　者：郑保锋 王宝民 王也 蓝长星 郑丹 ZHENG Baofeng;WANG Baomin;WANG Ye;LAN Changxing;ZHENG Dan(Guangdong Provincial Field Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary,School of Atmospheric Sciences,Sun Yat-sen University,Guangzhou 510275;Guangdong PIESAT International Information Technology Limited,Foshan 528200;Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies,Zhuhai 519082;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082;Institute of Meteorology and Climate Research-Atmospheric Environmental Research,Karlsruhe Institute of Technology,Garmisch-Partenkirchen 82467)

机构地区：[1]中山大学大气科学学院,广东省环珠江口气候环境与空气质量变化野外科学观测研究站,广州510275 [2]广东航天宏图信息技术有限公司,佛山528200 [3]广东省气候变化与自然灾害研究重点实验室,珠海519082 [4]南方海洋科学与工程广东省实验室(珠海),珠海519082 [5]卡尔斯鲁厄理工学院气象和气候研究所,加尔米施-帕滕基兴82467

出　　处：《环境科学学报》2023年第1期284-296,共13页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.U21A6001,41775015);广东省重点实验室项目(No.2020B1212060025);广东省基础和应用基础重大项目(No.2020B0301030004)。

摘　　要：利用2018年广东省环珠江口气候环境与空气质量变化野外科学观测研究站70 m气象塔上涡动协方差系统连续观测资料,对不同大气稳定度条件下近地面层相干结构的统计特征及其对湍流通量相似性的影响进行了初步研究.结果表明:(1)无量纲风速标准差(稳定、不稳定)和气温标准差(不稳定)遵循莫宁-奥布霍夫相似理论;(2)湍流速度(u、v、w)谱、温度(T)谱、CO_(2)和H_(2)O浓度谱在惯性副区均满足-2/3定律.w-T协谱、垂直速度(w)与标量(CO_(2)、H_(2)O)浓度的协谱(w-CO_(2)、w-H_(2)O)在惯性副区遵循-4/3定律;(3)不稳定条件下,热力湍流对H_(2)O和CO_(2)标量具有很好的输送作用,而以动量通量输送为代表的机械作用在弱不稳定条件下对H_(2)O和CO_(2)的输送效果最好;(4)上冲和下扫运动对湍流通量输送起主导作用,且随湍涡尺度的变化略有差异,湍流通量输送对大气层结的依赖性较弱.Using the eddy covariance data observed on a 70-meter meteorological tower located in the Guangdong Province Ring Pearl River Estuary Climate,Environment and Air Quality Change Field Scientific Observation and Research Station in 2018,we analyzed the characteristics of nearsurface coherent structures and its influence on turbulent transport similarities under different atmospheric stability conditions.The results show that:(1)the Monin-Obukhov similarity theory well describes the dimensionless standard deviations of turbulent velocities under both stable and unstable conditions,while its validity is challenged for the dimensionless standard deviation of temperature in stable conditions;(2)the turbulent velocity(u,v and w)and scalar(T,CO_(2)and H_(2)O)spectra follow the-2/3 law in the inertial subregion,while the cospectra(w-T,w-CO_(2),and w-H_(2)O)depict a-4/3 law in the inertial subregion;(3)under weakly stable conditions,scalars are mainly transported by shear-generated turbulence,while buoyancygenerated turbulence dominates the vertical transport of scalars in the convective boundary layer;(4)the vertical flux transport is mainly associated with ejections and sweeps which are related to the vortex scales but relatively independent to thermal stratification.

关 键 词：湍流通量 象限分析 相干结构 通量输送 珠江口 

分 类 号：X16[环境科学与工程—环境科学]