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Structure of spatial spectra of simulated cloud scenes at infrared wavelengths

机译：红外波长下模拟云景的空间光谱结构

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Abstract: Longwave infrared imagery of cloud fields are examined in terms of their power spectral density (PSD). In order to systematically investigate the dependence of the PSD on viewing conditions, a cloud scene simulator is employed to generate images of a simulated cloud field. The cloud field is fully three dimensional and is describes by its fluctuating temperature and liquid/ice water content fields. The imaging process accurately calculates the spatially varying attenuation of blackbody emission. Several views of a single cloud field are examined to study the effect of viewing angle on the image PSD. Zenith views produce isotropic PSDs, while nearly horizontal views contain a large amount of foreshortening and a correspondingly anisotropic PSD. One possible component of the foreshortening is simply geometric and can be estimated and compared to the simulation output. We find that geometrically induced foreshortening does not describe the PSD effects observed in the simulation for the relatively thin cirrus-like cloud simulated here. Possibly this indicates that the three-dimensional cloud structure is more important in some views that in others when there are large fluctuations in the cloud optical properties. We are pursuing a more quantitative description of this behavior.!4
机译：摘要：根据云的功率谱密度（PSD）检查了云场的长波红外图像。为了系统地研究PSD对观看条件的依赖性，采用了云场景模拟器来生成模拟云场的图像。云场是完全三维的，由其波动的温度和液体/冰水含量场来描述。成像过程可准确计算黑体发射的空间变化衰减。检查单个云场的多个视图以研究视角对图像PSD的影响。天顶视图产生各向同性的PSD，而近乎水平的视图包含大量的缩短和相应的各向异性PSD。缩短的一种可能成分就是简单的几何形状，可以进行估算并将其与模拟输出进行比较。我们发现，几何诱发的缩短并不代表在此模拟的相对较薄的卷云状云的模拟中观察到的PSD效果。可能这表明三维云结构在某些视图中比在其他视图中云光学特性存在较大波动时更为重要。我们正在对此行为进行更定量的描述。！4

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