WBGT ESTIMATION USING BRIGHTNESS TEMPERATURE FOCUSING ON WATER VAPOR BANDS OF THE HIMAWARI-8 SATELLITE AND ELEVATION IN KANTO REGION

Abstract

 Since WBGT is an index to evaluate the risk of the thermal environment for human health, they have been measured at several points in Japan. We proposed a formula to estimate WBGT from the thermal infrared measured in Himawari-8, Band 7, 13, 15 and Band 8, 10, which are sensitive to the cloud water and water vapor, respectively. The equation considered the height correction too. The estimated WBGTs were accurate as the root mean square errors averaged among 75 monitoring locations around Tokyo were within 2.0 degree. The improvement of the estimation was confirmed regarding the different altitude and the cases of the cloud cover.