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针对北京密云站的长期通量观测进行大孔径闪烁仪的平均印痕区域分析。首先从2008年全年8 152组湍流观测资料,以整体湍流特征量σw/u*以及其他数据合理性判据进行质量控制,获得6 806组有效数据;然后用一个解析解模型逐时次计算大孔径闪烁仪的二维印痕,并进行统计平均,获得各季平均印痕分布;将当地气象条件根据风向、风速和稳定度分为12类,分别统计各类条件的平均印痕分布。最后,以实测感热通量为例,计算当地实际湍流通量的气候平均印痕区域。结果表明,当地大孔径闪烁仪的平均通量印痕季节变化不大;各类气象条件中,稳定度和风向是影响印痕区域大小和方向的重要因素,风速影响相对较小;以实际湍流通量为权重的气候平均印痕可更准确反映观测结果的空间代表性,其分布与简单平均的印痕分布有所不同。
The average imprint area analysis of large aperture scintigraphy for long-term flux observation of Beijing Miyun station. First of all, 8 152 sets of valid data were obtained from 8 152 sets of turbulence observation data in 2008, and the overall turbulence characteristics σw / u * and other data reasonable criteria were used for quality control. Then an analytical solution model was used to calculate Large aperture scintillator two-dimensional impression, and the statistical average, get the average print distribution of each season; the local weather conditions according to the wind direction, wind speed and stability are divided into 12 categories, respectively, statistics of various types of conditions, the average footprint distribution. Finally, take the measured sensible heat flux as an example, calculate the average climate imprint area of the local actual turbulence flux. The results show that the seasonal variation of average flux imprint of local large-aperture scintigraphy is not obvious. Among all kinds of meteorological conditions, the stability and wind direction are the important factors affecting the size and direction of imprinting area, and the influence of wind speed is relatively small. The actual turbulent flux The weighted average of climate impressions can more accurately reflect the spatial representation of the observations, with a distribution that is somewhat different from the simple average distribution of impressions.