ひまわり8号データを用いた地表面温度算出式の検討

Abstract

The purpose of this study is development of estimation method of the land surface temperature (LST) from Himawari-8 data. By utilizing the feature that Advanced Himawari Imager (AHI) onboard Himawari-8 has three thermal infrared (TIR) bands in 10-12.5 μm, we developed the non-linear three-band algorithm that can calculate LST using three TIR bands. we verified satellite zenith angle dependence and land surface emissivity dependence of estimation accuracy by using AHI observation data which were simulated by Rstar6b. As a result, it was shown that the non-linear three-band algorithm can calculate LST accurately with RMSE lower than 1.5 K for satellite zenith angle lower than 60°. Moreover, the result showed that this estimation accuracy is better than that of the non-linear split-window algorithm that was applied to the Meteosat Second Generation (MSG), the Multifunction Transport Satellite (MTSAT) and any other satellites.