资源环境科技发展态势分析平台

Four-dimensional wind fields were derived from radiance measurements of the GIIRS onboard the Fengyun-4A satellite with 15-minute temporal resolution during Typhoon Maria (2018). Results are evaluated with independent ERA5 reanalysis, GDAS analysis and dropsonde wind profiles, and show a statistical root-mean-squared-error less than 2m/s for u and v components in troposphere against ERA5 and GDAS. The temporal variation of the wind fields from GIIRS at 15-minute intervals is consistent with that of the hourly ERA5. The added value of wind profiles over the NWP background field is also revealed. Further experiments confirm that higher temporal resolution from geostationary IR sounder measurements could provide better dynamic information. 4D dynamic information can be extracted from high-temporal-resolution geostationary hyperspectral IR radiances in a consistent and continuous manner that can be used together with the thermodynamic information for various quantitative applications such as NWP data assimilation, near real-time weather monitoring, situational awareness and nowcasting.