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首页> 外文期刊>Journal of the Atmospheric Sciences >RADIATIVE PROPERTIES OF FINITE INHOMOGENOUS CIRRUS CLOUDS - MONTE CARLO SIMULATIONS
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RADIATIVE PROPERTIES OF FINITE INHOMOGENOUS CIRRUS CLOUDS - MONTE CARLO SIMULATIONS

机译：有限非均质卷云的辐射特性-蒙特卡罗模拟

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The Monte Carlo method is used to study the impact of various cloud morphologies (roughness, voids, waves, and horizontal spreading) on radiative properties of finite, thin, model cirrus clouds. The cloud-top reflectance is calculated for various cloud-top structures and is compared to reflectance of finite homogeneous cloud of the same ice crystal size and ice water content. Cloud roughness, voids, and waves generally decrease cloud reflectance as well as cloud absorption. Although the local horizontal variations in the reflectance can be quite large (several hundred percent), variation in the total reflectance, integrated over the top surface of a cloud, is in the range of a few percent. For overhead incident radiation, the decrease in cloud reflectance due to the considered morphological changes remains under 5%, as compared to a finite homogeneous cloud. A comparable reduction in cloud reflectivity is achieved by about a 5% increase of the effective size of ice crystals. The reflectivity of an optically thin cloud is primarily determined by the total ice content and the effective ice crystal size. The morphological structure of a cloud plays a secondary role. [References: 29]
机译：蒙特卡罗方法用于研究各种云形态（粗糙度，空隙，波浪和水平扩展）对有限，薄型卷云辐射特性的影响。计算出各种云顶结构的云顶反射率，并将其与相同冰晶尺寸和冰水含量的有限均匀云的反射率进行比较。云的粗糙度，空隙和波浪通常会降低云的反射率以及云的吸收。尽管反射率的局部水平变化可能很大（几百％），但集成在云顶表面上的总反射率的变化在百分之几的范围内。对于架空入射辐射，与有限的均匀云相比，由于所考虑的形态变化而导致的云反射率下降保持在5％以下。通过使冰晶的有效尺寸增加约5％，可实现云反射率的可比降低。光学薄云的反射率主要取决于总冰含量和有效冰晶尺寸。云的形态结构起着次要作用。 [参考：29]

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