The Influence of Aircraft Speed Variations on Sensible Heat-Flux Measurements by Different Airborne Systems

The Influence of Aircraft Speed Variations on Sensible Heat-Flux Measurements by Different Airborne Systems
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飞机速度变化对不同机载系统感热通量测量的影响

DOI:
10.1007/s10546-013-9853-7
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发表时间:
2013
影响因子:
4.3
通讯作者:
Bange J.
Bange J.
中科院分区:
地球科学3区
文献类型:
--
作者:
Martin S;Bange J.

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克劳福德等人。 (Boundary-Layer Meteorol 66:237–245, 1993)表明时间平均值不适合机载涡流协方差通量计算。飞机通过湍流场的地面速度不是恒定的。原因之一可能是与垂直空气运动的相关性,因此某些类型的结构比其他结构的采样更密集。为了避免这种情况,时间采样数据根据变化的地面速度进行调整,以便修改后的估计相当于空间采样数据。介绍并讨论了使用时间和空间平均方法进行显热通量计算的比较。机载测量系统 Helipod 和 Dornier 128-6 的数据用于分析。这些系统的尺寸、重量和空气动力学特性各不相同,因为它们是小型无人机 (UAV),Helipod 是直升机搭载的湍流探测器,Dornier 128-6 是载人研究飞机。在对道尼尔、直升机直升机或无人机飞行航段进行平均时,并未发现由于速度变化而在协方差计算中预期的系统偏差。然而,我们发现各个航段的空间和时间平均通量之间的随机差异高达 30%。
Crawford et al. (Boundary-Layer Meteorol 66:237–245, 1993) showed that the time average is inappropriate for airborne eddy-covariance flux calculations. The aircraft’s ground speed through a turbulent field is not constant. One reason can be a correlation with vertical air motion, so that some types of structures are sampled more densely than others. To avoid this, the time-sampled data are adjusted for the varying ground speed so that the modified estimates are equivalent to spatially-sampled data. A comparison of sensible heat-flux calculations using temporal and spatial averaging methods is presented and discussed. Data of the airborne measurement systems, Helipod and Dornier 128-6 are used for the analysis. These systems vary in size, weight and aerodynamic characteristics, since theis a small unmanned aerial vehicle (UAV), the Helipod a helicopter-borne turbulence probe and the Dornier 128-6 a manned research aircraft. The systematic bias anticipated in covariance computations due to speed variations was neither found when averaging over Dornier, Helipod nor UAV flight legs. However, the random differences between spatial and temporal averaging fluxes were found to be up to 30 % on the individual flight legs.
DOI: 10.1175/2008bams2367.1
发表时间: 2008-10
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发表时间: 2002-01-01
影响因子: 3.4
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发表时间: 2013
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DOI: --
发表时间: 1999
期刊:
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DOI: 10.1007/s00704-006-0272-2
发表时间: 2007
影响因子: 3.4
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J. Bange;T. Spiess;A. J. van den Kroonenberg
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