A bias correction scheme for FY-3E/HIRAS-II observation data assimilation

Chen, Hongtao; Guan, Li

doi:https://doi.org/10.5194/amt-18-5591-2025

Articles | Volume 18, issue 20

https://doi.org/10.5194/amt-18-5591-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-18-5591-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 20

Research article

|

21 Oct 2025

Research article |

| 21 Oct 2025

A bias correction scheme for FY-3E/HIRAS-II observation data assimilation

Hongtao Chen and Li Guan

Supplement

https://doi.org/10.5194/amt-18-5591-2025-supplement

Data sets

ERA5 hourly data on pressure levels from 1940 to present Copernicus Climate Change Service, Climate Data Store https://doi.org/10.24381/cds.adbb2d47

NCEP ADP Global Upper Air and Surface Weather Observations (PREPBUFR format) National Centers for Environmental Prediction https://doi.org/10.5065/Z83F-N512

NCEP GFS 0.25 Degree Global Forecast Grids Historical Archive National Centers for Environmental Prediction https://doi.org/10.5065/D65D8PWK

Model code and software

A Description of the Advanced Research WRF Version 4 W. C. Skamarock et al. https://doi.org/10.5065/1dfh-6p97

Short summary

In order to correctly assimilate satellite radiance observations in data assimilation systems, the systematic observation biases must be corrected to conform to a Gaussian normal distribution with a mean of 0. In this paper, a two-step bias correction scheme is established based on radiation observations of HIRAS-II (Hyperspectral Infrared Atmospheric Sounder-II) carried on FY-3E.