Forecast Impact of the Geostationary Hyperspectral Infrared Sounder (GeoHIS) using the Korean Integrated Model-Observing System Simulation Experiment (KIM-OSSE)

The Korea Meteorological Administration (KMA) will operate a hyperspectral infrared sounder based on a geostationary satellite in 2037. The next-generation Geostationary Hyperspectral Infrared Sounder (GeoHIS) observes vertical temperature and humidity with high temporal and spatial resolution. Therefore, it can be used not only directly in nowcasting but also as input data for numerical prediction model, which is expected to improve weather forecast. We analyzed the forecast impact of the next-generation GeoHIS, which has high density in the Asia region, using the Korean Integrated Model-Observing System Simulation Experiment (KIM-OSSE). As a result of the forecast impact, improvements were confirmed in the mid to upper-level geopotential height (500 similar to 250 hPa) and lower-level temperature (850 hPa) of the troposphere in the globe and the Northern Hemisphere. In particular, we confirmed a significant improvement in the mid to upper-level geopotential height in the Asia region. These results will be used as support material for advancing of satellite data assimilation technology and for the establishment of next-generation satellite launch plans.