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<p>It is important to increase the accuracy of satellite radiance simulation in all-sky conditions in numerical weather forecasts by data assimilation. In this study, we used the WRF model outputs as the RTTOV-SCATT input data to simulate brightness temperature on the ATMS water vapor channels. On July 27, 2024, the atmospheric state in the Amnok River basin was simulated for the cases of six different microphysics schemes in the WRF model, namely Ferrier, WDM5, WSM6, Thompson, Morrison, and NSSL-2, to obtain the hydrometeor. The simulation results for the whole scan point of the simulation domain showed the smallest O-B of the Ferrier scheme, but it simulated BT much warmer than the observations over the rainband region. Thompson and NSSL-2 schemes simulate the coldest centre of BT over the ocean, but they have bias of the location. The O-Bs have channel dependence. They decrease as the height of the weighting function peak rises from the lower to the higher level. After the outliers are removed by Z-score estimation and normalized, the scheme with similar Gaussian distribution of O-B is the Thompson scheme. The sensitivity experiment result of microphysics schemes on RTTOV-SCATT simulation will be referred in the all-sky data assimilation of ATMS in the study area.</p>

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Comparison of RTTOV-SCATT simulations of brightness temperature for NOAA-21/ATMS water vapor channels with different WRF microphysics schemes: the case study of heavy rain event in the Amnok River basin on 27 July 2024

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Song-Ryong Kim,
  • Kwang-Chol Yu,
  • Chang-Bok Rim,
  • Chol-Ho Ryang,
  • Hyon-Il Ryang

摘要

It is important to increase the accuracy of satellite radiance simulation in all-sky conditions in numerical weather forecasts by data assimilation. In this study, we used the WRF model outputs as the RTTOV-SCATT input data to simulate brightness temperature on the ATMS water vapor channels. On July 27, 2024, the atmospheric state in the Amnok River basin was simulated for the cases of six different microphysics schemes in the WRF model, namely Ferrier, WDM5, WSM6, Thompson, Morrison, and NSSL-2, to obtain the hydrometeor. The simulation results for the whole scan point of the simulation domain showed the smallest O-B of the Ferrier scheme, but it simulated BT much warmer than the observations over the rainband region. Thompson and NSSL-2 schemes simulate the coldest centre of BT over the ocean, but they have bias of the location. The O-Bs have channel dependence. They decrease as the height of the weighting function peak rises from the lower to the higher level. After the outliers are removed by Z-score estimation and normalized, the scheme with similar Gaussian distribution of O-B is the Thompson scheme. The sensitivity experiment result of microphysics schemes on RTTOV-SCATT simulation will be referred in the all-sky data assimilation of ATMS in the study area.