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首页> 外文会议>25th Conference on Agricultural and Forest Meteorology and 12th Joint Conference on the Applications of Air Pollution Meteorology with Aamp;WMA and Fourth Symposium on the Urban Environment May 20-24, 2002 Norfolk, Virginia >SPECTRAL CHARACTERISTICS OF SURFACE LAYER TURBULENCE ABOVE SITES OF VARYING SURFACE STRUCTURE DERIVED FROM FLUXNET MONITORING DATA
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SPECTRAL CHARACTERISTICS OF SURFACE LAYER TURBULENCE ABOVE SITES OF VARYING SURFACE STRUCTURE DERIVED FROM FLUXNET MONITORING DATA

机译：由磁通监测数据得出的变化的表面结构上方各层表面湍流的谱特征

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摘要

Standard spectra are often used as a gauge of what eddy-covariance signals should look like. Deviations from that spectral shape are then attributed to shortcomings in instrumentation or measurement conditions. The most common set of standard spectra were derived by Kaimal et al. (1972) from a set of 45 hourly runs of eddy-covariance measurements taken over an extensive stretch of flat Kansas farmland. Here, we investigate whether common spectral shapes are present in long-term eddy-covariance measurements that include many thousands of hours and many different surface types. Ensemble spectra for fourteen different eddy-covariance tower sites were calculated using high frequency turbulence data provided by ten groups, all part of the FLUXNET community. The canopy heights of the sites used in the analysis span two orders of magnitude and a wide variety of canopy types as well as meteorological conditions.
机译：通常使用标准频谱来衡量涡旋协方差信号的外观。然后，与该光谱形状的偏差归因于仪器或测量条件的缺陷。最常见的标准光谱集由Kaimal等人得出。 （1972年）是根据在广阔的堪萨斯州平坦土地上进行的每小时45次涡流-协方差测量得出的。在这里，我们调查了在包括数千小时和许多不同表面类型的长期涡旋协方差测量中是否存在常见的光谱形状。使用FLUXNET社区所有部分的10个小组提供的高频湍流数据，计算了14个不同的涡流-协方差塔场的集合谱。分析中使用的站点的冠层高度跨越两个数量级，并且冠层类型和气象条件也多种多样。

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