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Validating Model Clouds and Their Optical Properties Using Geostationary Satellite Imagery

机译:利用对地静止卫星图像验证模型云及其光学性质

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A real-time validation scheme for diagnosing radiatively active clouds has been in operation for a number of years at the Australian Bureau of Meteorology. It compares IR channel imagery from four geostationary satellites and equivalent forward calculations using fields from the bureau's global and regional NWP models. The scheme also attempts to glean some information about cloud amounts from the satellite data for direct comparison with the model but is hampered by the reliance on a single spectral channel. A new radiance code derived from the Edwards and Slingo radiation scheme and several cloud optical property schemes has recently been implemented into the system. The forward calculations were performed using both the operational radiative transfer code and this new code, and the results were compared with satellite measurements. The effects of different cloud optical property schemes, cloud particle scattering, and cloud phase state were investigated. The results have shown a dramatic improvement in the comparison due to changes in the model physical parameterizations. The major achievement obtained in this study is the implementation of a new ice water content diagnostic scheme developed on the basis of lidar-radar data collected at the Southern Great Plains, the cloud and radiation test bed site of the Atmospheric Radiation Measurement (ARM) Program in Oklahoma. Using this scheme in the cold cloud temperature region (T < -50℃) in conjunction with the new forward radiance code, the modeled brightness temperature using fields from the global NWP model is significantly improved.
机译:用于诊断辐射活动云的实时验证方案已在澳大利亚气象局投入使用多年。它比较了来自四个对地静止卫星的红外通道图像,并使用了该局全球和区域NWP模型中的字段进行了等效的前向计算。该方案还尝试从卫星数据中收集有关云量的一些信息,以便与该模型进行直接比较,但是由于对单个频谱信道的依赖而受到阻碍。从爱德华兹和Slingo辐射方案以及几种云光学特性方案派生的新辐射代码最近已在系统中实现。使用可操作的辐射传输代码和此新代码进行前向计算,并将结果与​​卫星测量结果进行比较。研究了不同的云光学特性方案,云粒子散射和云相态的影响。由于模型物理参数设置的变化,结果显示比较结果有了显着改善。这项研究获得的主要成就是实施了一项新的冰水含量诊断计划,该计划是根据在南部大平原,大气辐射测量(ARM)计划的云层和辐射试验台地点收集的激光雷达数据进行开发的在俄克拉荷马州。在冷云温度区域(T <-50℃)中使用该方案并结合新的正向辐射度代码,使用来自全局NWP模型的场对建模的亮度温度进行了显着改进。

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