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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >An Intensive Campaign-Based Intercomparison of Cloud Optical Depth from Ground and Satellite Instruments under Overcast Conditions
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An Intensive Campaign-Based Intercomparison of Cloud Optical Depth from Ground and Satellite Instruments under Overcast Conditions

机译：在阴暗条件下从地面和卫星仪器的云光学深度基于密集的竞选基于竞争的基于云光学深度

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We used observations recorded at Chiba University in November 2018 to examine the variability in cloud optical depth (COD) under overcast conditions. First, we conducted a careful evaluation of four COD datasets retrieved from three types of surface observations: i) zenith radiance recorded by two sky radiometers; ii) solar radiation data collected by a pyranometer; and iii) spatial distribution of radiance recorded using a sky camera system. Although the COD retrieved from the pyranometer (camera) slightly (moderately) overestimated the COD from zenith radiance, we found a satisfactory correlation among all surface estimates. This result suggests the efficacy of both pyranometer- and camera-based approaches and supports their broader use when dedicated cloud observations are not available. We then assessed satellite-based COD estimates retrieved from the recently launched Advanced Himawari Imager (AHI) aboard Himawari-8 (H-8) and Second-generation Global Imager (SGLI) on the Global Change Observation Mission for Climate (GCOM-C). Overall, we found good agreement between ground and satellite estimates; their correlation and root mean square error were virtually equivalent to values reported for co-located surface-based instruments. Nevertheless, the AHI-based COD was found to be slightly positively biased with respect to surface datasets.
机译：我们在2018年11月在千叶大学录制的观察员审查了云光学深度（COD）下的阴暗条件下的可变性。首先，我们仔细评估了从三种类型的表面观察中检索的四个COD数据集：i）由两个天空辐射仪记录的Zenith辐射; ii）由绘制仪收集的太阳辐射数据;和iii）使用天空摄像头系统记录的光线的空间分布。虽然从略微（适度）从拟塔仪（相机）检索的鳕鱼高估了从Zenith辐射的COD，但我们发现所有表面估计之间的令人满意的相关性。这一结果表明，当专门的云观测不可用时，基于思考表和基于相机和相机的方法的功效并支持更广泛的使用。然后，我们评估了从最近推出的高级Himawari Imager（AHI）的基于卫星的COD估计，在Himawari-8（H-8）和第二代全球成像器（SGLI）上的气候（GCOM-C）的全球变更观察团。总体而言，我们在地面和卫星估计之间找到了良好的一致性;它们的相关性和均方方误差几乎相当于报告的基于基于表面仪器的值。然而，发现基于AHI的COD相对于表面数据集略微正偏置。

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