Fujita, T., K. Okamoto, H. Seko, M. Otsuka, H. Owada, and M. Hayashi, 2023: Mesoscale observing system simulation experiment (OSSE) to evaluate the potential impact from a geostationary hyperspectral infrared sounder. J. Meteor. Soc. Japan, 101.
Early Online Release Graphical Abstract NEW GA
Plain Language Summary: The impact of a hyperspectral infrared sounder on a geostationary satellite (GeoHSS) in a regional numerical weather prediction system is investigated using the reanalysis-based observing system simulation experiment (RA-OSSE). The assimilation of temperature and relative humidity GeoHSS pseudo-observations showed an improving trend in the prediction of heavy rainfall events during the Baiu seasons in 2017, 2018, and 2020. The improvements are due to large-scale impacts from the pseudo-observations with a comprehensive coverage over clear-sky areas, propagating to precipitation areas through the assimilation cycle and forecasts.
- The RA-OSSE uses ERA5 as the pseudo-truth atmospheric profile.
- The pseudo-observations are generated from ERA5 using a one-dimensional variational retrieval scheme based on the spectral characteristics of the GeoHSS.
- Verifications against radiosondes and radar/rain gauge analyzed precipitation show an overall improvement. The impacts propagated in wind fields and precipitation distributions through the assimilation cycle and forecasts.