Land Surface Temperature Retrieval from Fy-3e MERSI-LL Measurements

This paper addresses the retrieval of land surface temperature (LST) from the measurements acquired by the Medium Resolution Spectral Imager – Low Light (MERSI-LL) on Fengyun 3E (FY-3E) satellite. First, a generalized split-window algorithm is developed using radiative transfer modelling experiments. Then, LSTs are retrieved from the FY-3E MERSI-LL measurements in Sept. of 2022 over a study area with longitude from 105°E to 135°E and latitude from 25°N to 50°N. Finally, the LSTs retrieved in this work are validated against the MOD11C1 V61 product, in which the LST product of the Advanced Geostationary Radiation Imager on Fengyun 4A (FY-4A) satellite serves as a connecting bridge. The results show that the accuracy of the LSTs retrieved from the FY-3E MERSI-LL measurements in this work is 0.01±0.75 K against the MOD11C1 V61 product.