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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Cloud microphysical and radiative properties for parameterization and satellite monitoring of the indirect effect of aerosol on climate - art. no. 8632
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Cloud microphysical and radiative properties for parameterization and satellite monitoring of the indirect effect of aerosol on climate - art. no. 8632

机译：云的微物理和辐射特性，用于对气溶胶对气候的间接影响进行参数化和卫星监测。没有。 8632

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The spatial variability of the microphysical fields in stratocumulus clouds is documented in this paper with statistics of droplet number concentration, droplet mean volume radius, and liquid water content for eight cases of the second Aerosol Characterization Experiment. Statistics are calculated in five sublayers, from cloud base to cloud top, and they are utilized for deriving estimates of cloud optical thickness and liquid water path, by assuming either random or maximum overlap. The resulting in situ frequency distributions of optical thickness and liquid water path are validated against distributions of these two parameters retrieved from independent remote sensing measurements of cloud radiances. They are also used for testing parameterizations of optical thickness based on liquid water path and either the droplet effective radius or the cloud droplet number concentration. This unique data set of extensive, concomitant, and independent measurements of cloud microphysical and radiative properties is finally used for assessing the detectability of the aerosol indirect effect through examination of the correlation between cloud optical thickness and droplet effective radius. If only cases of comparable values of geometrical thickness are considered, the correlation between optical thickness and effective radius is negative, as anticipated by Twomey [1977]. However, if the most polluted cases are also accounted for, the trend suggests a positive correlation. In fact, the most polluted cloud systems sampled during ACE-2 were slightly drier, hence thinner, than the marine and intermediate cases, hence producing a positive correlation between optical thickness and droplet effective radius. This study demonstrates that the monitoring of the aerosol indirect effect with satellite observations requires an independent retrieval of the liquid water path together with the cloud optical thickness and droplet effective radius. [References: 43]
机译：本文记录了平积云中微物理场的空间变异性，并通过第二次气溶胶表征实验的八种情况的液滴数浓度，液滴平均体积半径和液态水含量进行了统计。统计量是在五个子层（从云层基础到云层顶部）中计算得出的，并通过假定随机或最大重叠来将其用于得出云层光学厚度和液态水路径的估算值。根据从云辐射的独立遥感测量中获得的这两个参数的分布，对所得的光学厚度和液态水路径的原位频率分布进行了验证。它们还用于基于液体水路径和液滴有效半径或云滴数量浓度测试光学厚度的参数化。最终，通过检查云的光学厚度与液滴有效半径之间的相关性，使用这种独特的，广泛，伴随且独立的云微物理和辐射特性测量数据集来评估气溶胶间接效应的可检测性。如果仅考虑几何厚度的可比较值的情况，则光学厚度与有效半径之间的相关性为负，正如Twomey [1977]所预期的那样。但是，如果也考虑了污染最严重的病例，则趋势表明存在正相关。实际上，在ACE-2期间采样的污染最严重的云系比海洋和中间情况稍干，因此更薄，因此在光学厚度和液滴有效半径之间产生正相关。这项研究表明，通过卫星观测监测气溶胶间接效应需要独立获取液态水路径以及云的光学厚度和液滴有效半径。 [参考：43]

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