Cloud microphysical properties from aircraft measurements during the Southern Ocean Clouds, Radiation, Aerosol Transport Experimental Study are used to evaluate the cloud products from the geostationary satellite Himawari‐8 (H‐8) and the polar‐orbiting satellite the Moderate Resolution Imaging Spectroradiometer (MODIS). Compared to the in situ aircraft observations when aircraft flew horizontally near cloud tops, the cloud droplet effective radius (r_e) and number concentration (N_d) from H‐8 (MODIS) are 33% (26%–31%) and 2% (9–13%) larger. Both the H‐8 and MODIS retrievals behave similarly for liquid‐only and mixed‐phase low‐level clouds, indicating the weak sensitivity of the satellite cloud retrieval performance to cloud phase. The r_e and N_d of the cloud profiles from aircraft measurements were also used to compare with the satellite product. It shows that H‐8 r_e and N_d agree better with aircraft measurements when considering only the in situ data acquired in the upper portions (highest 20%) of the clouds. Roughly, the r_e overestimation by H‐8 decreases from 18% to 3% when considering the upper portions of clouds compared to all cloud layer averages, except for one case with drizzles appeared. In addition, the performance of MODIS r_e and N_d is highly dependent on the wavelengths the retrieval method uses. The droplet r_e retrievals using wavelength of 1.6 μm have much larger biases than that using the other two channels. The potential effects of the cloud vertical variation and the photon penetration depth, the cloud heterogeneity, the cloud droplet size spectra, and the drizzle on satellite retrievals have also been discussed.

中文翻译：

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利用南大洋上的原位飞机测量评估源自MODIS和Himawari-8的云微物理特性

通过在南部海洋云，辐射，气溶胶运输实验研究期间飞机测量获得的云微物理性质，用于评估对地静止卫星Himawari-8（H-8）和极轨卫星中分辨率成像光谱仪（MODIS）的云产品）。与飞机在云顶附近水平飞行时的现场飞机观测相比，H-8（MODIS）的云滴有效半径（r _e）和数量浓度（N _d）为33％（26％–31％）和2 ％（9–13％）较大。H-8和MODIS检索对于纯液相和混合相低层云的表现相似，这表明卫星云检索性能对云相的敏感性较弱。在[R来自飞机测量的云剖面的_e和N _d也用于与卫星产品进行比较。它表明，当仅考虑从云层的上部（最高20％）获取的现场数据时，H-8 r _e和N _d与飞机的测量结果更加吻合。大致而言，与所有云层平均值相比，考虑云层上部时，H-8的r _e高估从18％降低到3％，除了出现小雨的情况。此外，MODIS r _e和N _d的性能高度依赖于检索方法使用的波长。水滴ř _Ë使用的1.6微米波长检索具有大得多的偏差比使用另两个通道。还讨论了云垂直变化和光子穿透深度，云非均质性，云液滴尺寸谱和毛毛雨对卫星取回的潜在影响。