Abstract
It is well known that the measurement of cloud top height (CTH) is important, and a geostationary satellite is an important measurement method. However, it is difficult for a single geostationary satellite to observe the global CTH, so joint observation by multiple satellites is imperative. We used both active and passive sensors to evaluate the reliability of joint observation of geostationary satellites, which includes consistency and accuracy. We analyzed the error of CTH of FY-4A and HIMAWARI-8 and the consistency between the two satellites and conducted research on the problem of missing measurement (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) has CTH data, but FY-4A/HIMAWARI-8 does not) of the two satellites. The results show that FY-4A and HIMAWARI-8 have good consistency and can be jointly observed, but the measurement of CTH of FY-4A and HIMAWARI-8 has large errors, and the error of FY-4A is greater than that of HIMAWIRI-8. The error of CTH is affected by the CTH, cloud optical thickness (COT) and cloud type, and the consistency between the two satellites is mainly affected by the cloud type. FY-4A and HIMAWARI-8 have the problem of missing measurement. The missing rate of HIMAWARI-8 is greater than that of FY-4A, and the missing rate is not affected by the CTH, COT and surface type. Therefore, although FY-4A and HIMAWARI-8 have good consistency, the error of CTH and the problem of missing measurement still limit the reliability of their joint observation.
Highlights
Clouds have an important influence on the Earth0 s radiation balance [1,2,3,4]
The error of cloud top height (CTH) is affected by the CTH, cloud optical thickness (COT) and cloud type, and the consistency between the two satellites is mainly affected by the cloud type
The Measurement Accuracy of FY-4A and HIMAWARI-8 and the Difference between the Two. Both FY-4A and HIMAWARI-8 are equipped with visible light infrared radiation imagers, and the accuracy of the cloud top height inversion is poorer than that of CALIPSO’s lidar
Summary
Clouds have an important influence on the Earth0 s radiation balance [1,2,3,4]. The Earth’s climate system is driven by surface energy [2], which is composed of solar short-wave radiation and Earth’s long-wave radiation, of which the Earth’s long-wave radiation is significantly affected by the cloud top height [7,8,9]. Accurate measurement of cloud top height is very important for predicting climate change [10]. The cloud top height is an important parameter in industries such as weather forecasting, artificial weather modification, and aviation. Obtaining the cloud top height is a very important task
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