| 20 km NHRCM | 5 km NHRCM |
---|---|---|
Grid number | 281 × 281 × 50 | 527 × 804 × 50 |
Time interval | 60Â s | 20Â s |
Initial and lateral boundary condition | JRA-55 (Kobayashi et al. 2015) | 20Â km NHRCM |
Initial date | July 20 | July 21 |
Target years | From September 1958 to August 2020 First 40 days (July 21–August 31) are spin-up durations for NHRCM with 5 km grid spacing | |
Topography | GTOPO30 (grid mean) | |
Microphysics | Prognostic variables: mixing ratio (water vapor, cloud water, cloud ice, snow, and graupel) and number concentration (cloud ice, snow, graupel) (Ikawa and Saito 1991) | |
Boundary layer | MYNN level 2.5 (Nakanishi and Niino 2004) | |
Cumulus convection | KF scheme (Kain and Fritsch 1990; Kain 2004; Nakano et al. 2012) | |
Radiation | ||
Land surface | Improved MJ-SiB (Hirai et al. 2007) | |
Wave number boundary of spectral nudging | Wave length: longer than 800Â km Height: over 2Â km above sea level | Wave length: longer than 500Â km Height: over 7Â km above sea level |
(von Storch et al. 2000; Nakano et al. 2021) |