[A-CG37] Satellite Earth Environment Observation

[ACG37-P13] Sea surface temperature from Himawari-9

*Yukio Kurihara¹, Misako Kachi¹ (1.Japan Aerospace Exploration Agency / Earth Observation Research Center)

Keywords:SST, Himawari-9

The Japan Aerospace Exploration Agency (JAXA) provides SST and other geophysical parameters using the data from the Japanese geostationary Himawri satellite. The Japan Meteorological Agency (JMA) switched the primary Himawari satellite from the Himawari-8 to Himawari-9 in December 2022. In a test phase, Himawari-9 SSTs were calculated more than 0.5 K lower than the buoy data. To improve the bias, we calculated calibration coefficients for adjusting the Himawari-9 infrared data using the data from the Second generation Global Imager (SGLI). The SGLI is the optical sensor onboard the Global Change Observation Mission -Climate (GCOM-C) satellite. Calibration coefficients were generated using a data set we calculated using the SGLI data for the comparison with the Himawari-9 data. The calibration improved Himawari-9 SST, and the bias is nearly zero. The preliminary calculated bias and standard deviation of the Himawari-9 SST obtained within 60 degrees satellite zenith angle were 0.02 K and 0.6 K by comparison with buoy data. Himawari-9 SST and its validation results are available at the JAXA Himawari Monitor and the Himawari Validation Web.