FengYun-3/HIRAS Constellation FY-AIRNet methanol (CH₃OH) Products: Columns, Uncertainties, Averaging kernels

This dataset provides methanol (CH₃OH) total columns, uncertainties, and total-column averaging kernels retrieved from FengYun-3/HIRAS constellation using the FY-AIRNet (Atmospheric InfRared Neural Network for FY-3) algorithm. The constellation comprises FY-3E/HIRAS-II in a dawn–dusk orbit (overpass the equator at ~05:30 am/pm LST), FY-3F/HIRAS-II in a mid-morning orbit (~10:00 am/pm LST), and FY-3D/HIRAS in an afternoon orbit (~2:00 am/pm LST). FY-3D/HIRAS is expected to be replaced by the newly launched FY-3H/HIRAS-II. The FY-3/HIRAS constellation improves the temporal resolution of global measurements from low-Earth orbit TIR sounders to about 4 hours. The current dataset contains representative observations from the 15th day of each month from February 2024 through January 2025, and FY-3E/HIRAS-II observations from June 2023. Continuous time-series data will be released subsequently. When using this dataset, we recommend applying the post-filtering flags to exclude retrievals with limited or no measurement sensitivity, excessive measurement noise, or assumed vertical profile shapes that are incompatible with the observations. Surface temperature can also be used to filter out retrievals with high noise levels. Cloud screening is also recommended. If you have any questions, please do not hesitate to contact Zhenxing Liang ([e-mail]).