Latest Improvements and Future Plans of the JAXA GHRSST Datasets of MW, LEO-IR and GEO-IR

Short abstract JAXA operationally produces and distributes various satellite-based SST datasets by using passive microwave, polar-orbital InfraRed and geostationary InfraRed imagers in GDS2.0 format from the JAXA GHRSST server (https://suzaku.eorc.jaxa.jp/GHRSST/) and Himawari Monitor (https://www.eorc.jaxa.jp/ptree/) in near-real-time basis and archives past period data since June 2002. We have updated SGLI SST Ver.3 to improve cloud masks in November 2021 and plan to update AMSR2 SST Ver.4.1 soon. Due to the improved cloud masking, SGLI SST V3.0 in the daytime are retrieved from the SGLI measurements only with pre-calculated RTM-based coefficients and Baysian-based PDFs and are 100% independent from any other in-situ and analysed data. AMSR2 SST Ver.4.1 will correct underestimation trends versus in-situ observations over Northern low- and mid-latitudes since 2019 and provide SST retrievals under high-wind and weak precipitation conditions, which are set to missing in previous versions. We also prepare tuning of Himawari SST algorithm corresponding to planning change-over of the Japanese geostationary satellite from Himawari-8 to -9 scheduled in late 2022. Overlap operations of Himawari-8 and -9 are planned by Japan Meteorological Agency (JMA) for a couple of months to inter-calibrate two SST products. We are also preparing multiple SST products for the AMSR3 onboard the GOSAT-GW satellite to be launched in JFY2023. Those products will succeed SST datasets of AMSR-E and AMSR2 and improve robustness of SST retrievals and spatial resolution by adding new channels in 10-GHz. We will introduce the latest status of SST datasets and future plans for AMSR3.