Aircraft observations collected during the Southern Ocean Cloud Radiation Aerosol Transport Experimental Study in January‐February of 2018 are used to evaluate cloud properties from three satellite‐imager datasets: (1) the Moderate Resolution Imaging Spectroradiometer level 2 (collection 6.1) cloud product, (2) the CERES‐MODIS Edition 4 cloud product, and (3) the NASA SatCORPS Himawari‐8 cloud product. Overall the satellite retrievals compare well with the in situ observations, with little bias and modest to good correlation coefficients when considering all aircraft profiles for which there are coincident MODIS observations. The Himawari‐8 product does, however, show a statistically significant mean bias of about 1.2 μm for effective radius (r_e) and 2.6 for optical depth (τ) when applied to a larger set of profiles with coincident Himawari‐8 observations. The low overall mean‐bias in the r_e retrievals is due in part to compensating errors between cases that are non‐ or lightly precipitating, with cases that have heavier precipitation. r_e is slightly biased high (by about 0.5–1.0 μm) for non‐ and lightly precipitating cases and biased low by about 3–4 μm for heavily precipitating cases when precipitation exits near cloud top. The bias in non‐ and lightly precipitating conditions is due to (at least in part) having assumed a drop size distribution in the retrieval that is too broad. These biases in the r_e ultimately propagate into the retrieved liquid water path and number concentration.

中文翻译：

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通过SOCRATES战役的原位测量评估MODIS和Himawari-8低云在南大洋的反演

在2018年1月至2月的南部海洋云辐射气溶胶传输实验研究中收集的飞机观测数据用于评估来自三个卫星成像仪数据集的云特性：（1）中分辨率成像光谱仪2级（集合6.1）云产品，（ 2）CERES‐MODIS Edition 4云产品，以及（3）NASA SatCORPS Himawari-8云产品。总体而言，当考虑所有MODIS观测值相吻合的飞机轮廓时，卫星反演结果与原位观测值比较好，偏差很小，相关系数适度到良好。然而，Himawari-8产品的有效半径（r _e）和光学深度（τ）确实显示出统计学上显着的平均偏差，约为1.2μm ，而光学深度（τ）为2.6）应用于具有喜马拉雅山8观测值同时出现的较大剖面图时。低总体平均偏置在ř _ë检索部分是由于补偿其是非或轻微沉淀箱子之间的误差，与具有更重的沉淀的情况。当降水量在云顶附近时，对于非降水和轻度降水，r _e略有偏高（大约0.5–1.0μm），对于高度降水的情形，r _e偏低大约3–4μm。非沉淀和轻度沉淀条件下的偏差是由于（至少部分地）由于在检索中假定的液滴尺寸分布太宽而造成的。r _e中的这些偏差最终会传播到检索到的液态水路径和数量浓度中。