Applications of the Advanced Radiative Transfer Modeling System (ARMS) to Characterize the Performance of Fengyun–4A/AGRI

Abstract

This study applies the Advanced Radiative Transfer Modeling System (ARMS), which was developed to accelerate the uses of Fengyun satellite data in weather, climate, and environmental applications in China, to characterize the biases of seven infrared (IR) bands of the Advanced Geosynchronous Radiation Imager (AGRI) onboard the Chinese geostationary meteorological satellite, Fengyun–4A. The AGRI data are quality controlled to eliminate the observations affected by clouds and contaminated by stray lights during the mid–night from 1600 to 1800 UTC during spring and autumn. The mean biases, computed from AGRI IR observations and ARMS simulations from the National Center for Environmental Prediction (NCEP) Final analysis data (FNL) as input, are within −0.7–1.1 K (0.12–0.75 K) for all seven IR bands over the oceans (land) under clear–sky conditions. The biases show seasonal variation in spatial distributions at bands 11–13, as well as a strong dependence on scene temperatures at bands 8–14 and on satellite zenith angles at absorption bands 9, 10, and 14. The discrepancies between biases estimated using FNL and the European Center for Medium–Range Weather Forecasts Reanalysis–5 (ERA5) are also discussed. The biases from water vapor absorption bands 9 and 10, estimated using ERA5 over ocean, are smaller than those from FNL. Such discrepancies arise from the fact that the FNL data are colder (wetter) than the ERA5 in the middle troposphere (upper–troposphere).

Improvements of the Microwave Gaseous Absorption Scheme Based on Statistical Regression and Its Application to ARMS

“…Hence, we believe that BTs observed in these channels contain more significant noise compared to other ATMS channels. On the other hand, temperature from ERA5 data is also inconsistent with that from NCEP FNL data above 200 hPa (Tang et al., 2021). This discrepancy highlights the challenges faced by current reanalysis data in accurately capturing temperature fields at higher altitudes.…”

Comparison Among All‐Sky Simulations, FY‐3E MWTS‐3 and FY‐4A AGRI Observations of the First Typhoon Malakas in 2022

“…Figure 3c shows the WFs for channels 8–14 from the Advanced Geosynchronous Radiation Imager (AGRI) onboard the Chinese Fengyun‐4A (FY‐4A) geostationary satellite. FY‐4A AGRI has three visible channels 1–3 and seven infrared (IR) channels 8–14 (Tang et al., 2021). In this study, the AGRI channel 12 (∼10.7 μm) is used.…”