Remote sensing products of inherent optical properties of Hulun Lake from 2016 to 2020

Hulun Lake is the largest steppe lake in the high latitude semi-arid region of inland China, which is of great significance for grassland production and steppe - lake ecosystem maintenance. The absorption coefficient of water can characterize the optically active components in water and is helps to estimate the optically active substances and other related parameters of water body and water environment. Based on the quasi-analytical algorithm（QAA）, a QAA-750E absorption coefficient inversion algorithm suitable for inland water bodies is used in this paper, based on Sentinel-3/OLCI remote sensing reflectance data, The monthly mean phytoplankton absorption coefficient and backscattering coefficient of Hulun Lake during 2016-2020 were produced. Where N = 15, R2 is 0.59, RMSE is 0.55, and MRD is 0.54, indicating that the data results have a certain reliability. The product can provide data support for water quality monitoring and ecological environment protection of Hulun Lake.