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- Title
An Intensive Campaign-Based Intercomparison of Cloud Optical Depth from Ground and Satellite Instruments under Overcast Conditions.
- Authors
Damiani, Alessandro; Hitoshi Irie; Tamio Takamura; Rei Kudo; Khatri, Pradeep; Hironobu Iwabuchi; Ryosuke Masuda; Takashi Nagao
- Abstract
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.
- Subjects
OPTICAL depth (Astrophysics); SOLAR radiation; STANDARD deviations; ANIMAL population density; ARTIFICIAL satellites
- Publication
SOLA, 2019, Vol 15, p198
- ISSN
1349-6476
- Publication type
Article
- DOI
10.2151/sola.2019-036