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首页> 外文期刊>Geophysical Research Letters >Overlap statistics of shallow boundary layer clouds: Comparing ground-based observations with large-eddy simulations
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Overlap statistics of shallow boundary layer clouds: Comparing ground-based observations with large-eddy simulations

机译：浅层边界层云的重叠统计：将地面观测资料与大涡模拟进行比较

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摘要

High-resolution ground-based measurements are used to assess the realism of fine-scale numerical simulations of shallow cumulus cloud fields. The overlap statistics of cumuli as produced by large-eddy simulations (LES) are confronted with Cloudnet data sets at the Julich Observatory for Cloud Evolution. The Cloudnet pixel is small enough to detect cumuliform cloud overlap. Cloud fraction masks are derived for five different cases, using gridded time-height data sets at various temporal and vertical resolutions. The overlap ratio (R), i.e., the ratio between cloud fraction by volume and by area, is studied as a function of the vertical resolution. Good agreement is found between R derived from observations and simulations. An inverse linear function is found to best describe the observed overlap behavior, confirming previous LES results. Simulated and observed decorrelation lengths are smaller (approximate to 300m) than previously reported (>1km). A similar diurnal variation in the overlap efficiency is found in observations and simulations.
机译：高分辨率的地面测量用于评估浅积云场的精细规模数值模拟的真实性。由大涡模拟（LES）产生的积云的重叠统计数据与朱利希天文台（Julich Observatory）的Cloudnet数据集相对应。 Cloudnet像素足够小，可以检测到积云重叠。使用不同时间和垂直分辨率的网格时间高度数据集，针对五种不同情况导出了云分数掩码。重叠率（R），即云的体积与面积之比，是垂直分辨率的函数。从观察和模拟得出的R之间找到了很好的一致性。发现反线性函数可以最好地描述观察到的重叠行为，从而确认了先前的LES结果。模拟和观察到的去相关长度比以前报道的（> 1km）小（大约300m）。在观测和模拟中发现重叠效率有类似的昼夜变化。

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