采样长度和频率对大气湍流数据处理结果的影响  

The Influences of the Sampling Length and Frequency on the Processing of Atmospheric Turbulent Data

作　　者：李富余[1] 王凯[1] 张宏升[1] 陈重[1] 康凌[1] 张霭琛[1] 

机构地区：[1]北京大学物理学院大气科学系,北京100871

出　　处：《气象水文海洋仪器》2003年第3期25-31,共7页Meteorological,Hydrological and Marine Instruments

基　　金：国家自然科学研究基金委员会;国家重点基础研究项目资助

摘　　要：本文利用HEIFE大气边界层实验资料,计算和比较了不同采样长度和不同采样频率对大气湍流自方差和协方差的影响。结果表明:在进行湍流统计特征量计算过程中,采样长度增加时,垂直分量风速方差无明显变化,水平分量风速方差增大;随着风速的减小以及稳定度参数 z/L的增加,采样长度对计算结果的影响变得更为突出。另外,当采样频率增加时,垂直风速方差略有增大,水平风速方差无明显差异。In this paper, the data obtained from HEIFE experiment in August, 1992 are used to study the influences of the sampling length and frequency on the variance and covariance of atmospheric turbulence. The results indicate that the vertical component of wind velocity variance remains unchanged but the hori- zontal component increases as the sampling length increases. The influence of the sampling length on the calculated results becomes evident with the decrease of wind velocity and the increase of stability parame- terz/L. Furthermore, the vertical component of wind velocity variances do not have evident variance but the horizontal component increases with the sampling frequency increases.

关 键 词：大气湍流 数据采集 观测法 采样长度 频率 数据处理 

分 类 号：P433[天文地球—大气科学及气象学]