Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 19, issue 20
Articles | Volume 19, issue 20
https://doi.org/10.5194/gmd-19-10077-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-19-10077-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 20
Development and technical paper
 | 
22 Oct 2026
Development and technical paper |  | 22 Oct 2026

Optimization of the fast layer transmittance algorithm in RTTOV v13.1 for strong water vapor absorption channels of the FY-3F HIRAS-II instrument using LBLRTM v12.11

Panxiang Zhang, Peng Zhang, Gang Ma, Rui Li, Lu Lee, Wenguang Bai, and Chengli Qi

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Short summary
To enhance atmospheric transmittance accuracy in strong water vapor absorption bands, this study proposes an optimized scheme for the fast transmittance algorithm applied to the Hyperspectral Infrared Atmospheric Sounder-II. It introduces a transmittance threshold for sample selection and a weighted least squares regression with transmittance weighting. Validation against line-by-line models and observations shows significant improvements in forward model accuracy and stability at 6.7 μm.
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