An Investigation of the Fengyun-4A/B GIIRS Performance on Temperature and Humidity Retrievals

The Fengyun-4A/B (FY-4A/B) geostationary satellite carries the Geostationary Interferometric Infrared Sounder (GIIRS). instrument parameters of GIIRS on FY-4A and FY-4B are not exactly same, which is crucial for atmospheric temperature humidity measurements. objective this paper to discuss influence spectral range retrieval FY-4A/B GIIRS. Firstly, we performed channel selection choose appropriate channels retrieval. Then, multiple cycling utilization physical method proposed conducted improving accuracy, results compared. Finally, perturbation analysis sensitivity perturbations due difference in between two show can realize improvement average accuracy by more than 0.9 K 3.0% humidity. As widens, superior that from 130 hPa 400 hPa. Furthermore, also shows extension beneficial This study could offer usefulness current instruments with observed on-orbit bias, a reference parameter design subsequent instruments.