吕乃平,范锡安,陈景南,郑月明,周明煜. 1979. 边界层大气湍流特征的声雷达探测[J]. 气象学报, 37(3):59-71, doi:10.11676/qxxb1979.029
边界层大气湍流特征的声雷达探测
REMOTE SENSING OF THE TURBULENT CHARACTERISTICS IN THE ATMOSPHERIC BOUNDARY LAYER BY ACOUSTIC RADAR
投稿时间:1979-02-03  
DOI:10.11676/qxxb1979.029
中文关键词:  
英文关键词:
基金项目:
作者单位
吕乃平 中国科学院大气物理研究所 
范锡安 中国科学院大气物理研究所 
陈景南 中国科学院大气物理研究所 
郑月明 中国科学院大气物理研究所 
周明煜 中国科学院大气物理研究所 
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中文摘要:
      声雷达可以直接测量温度脉动谱ΦT(K0)或温度结构系数CT2值。由于大气中谱的尺度很宽,在边界层大气中,用声雷达测得的ΦT(K0)或CT2是一个随机量,具有正偏态分布的特性,并满足对数正态分布。从ΦT(K0)的频谱分析中得到,在频率为10-3—3×10-3-1的范围内,存在着一个能量的峰值区,峰值和高频之间,能量的过渡带很陡。过去一般认为中尺度范围是大气谱段中能量的低值区。本文的分析发现,在中尺度范围内,无论在稳定或不稳定层结,经常存在着几分钟到十几分钟的周期活动,并对能量产生较大的贡献。这对今后大气湍流理论的研究,是一个值得注意的问题。此外,由于大气中谱尺度很宽,必须正确地选取气象要素或其它物理量的平均时间,才能获得稳定的气象要素的平均值。
英文摘要:
      The magnitude of temperature fluctuation spectrum ΦT(K0) or temperature structure coefficient CT2 can be directly measured by acoustic radar. In atmosphere, the spectrum scale is very wide, so in atmospheric boundary layer the magnitude ΦT(K0) or CT2 measured by acoustic radar is a random variable obeying the logarithmic normal distribution.We analysed the frequency spectra of ΦT(K0) and found that in the frequency range of 10-3-3×10-3 c/s there is a maximum value of vange energy. Between the maximum value range and high-frequency range exists a sharp transitional band of energy. At past years some meteorologists usually considered that there is a gap in the meso-scale range of spectra. In this articale, it is shown that at meso-scale range, whenever in stable or unstable conditions there is a cyclic activity of time scale from several minites to more ten minites and it makes a great contribution to the energy. This phenomena may be of imimportance for the theoritical research of the atmospheric turbulence. Since in the atmosphere the spectral range is very wide, we must select correctly the length of mean time in the measurement of meteorological elements or other physical parameters to obtain their stable means.
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