Work

The rayleigh effects on the atmospheric correction of the ultraviolet imager on HY-1C and HY-1D satellites

Year: 2025

Type: article

Abstract: Ultraviolet (UV) light is a key component of solar radiation, significantly impacting marine ecosystems. It is necessary to measure the ultraviolet light on the ocean which is now available from the Ultraviolet Imager (UVI) on the two ocean color satellites (HY-1C and HY-1D). The atmospheric correction (AC) procedure of the UVI data is based on the Layer Removal Scheme for Atmospheric Correction (LRSAC). Evaluation with Marine Optical BuoY in-situ data shows water-leaving reflectance (Rrs) accuracy with mean relative errors (MRE) of 2.35% (HY-1C) and 3.9% (HY-1D), and mean absolute errors (MAE) of 17.31% (HY-1C) and 15.68% (HY-1D). The global daily and the 8-day composite images of the UVI demonstrate the spatial patterns of Rrs at the ultraviolet region, similar to the Rrs products of the Chinese Ocean Color and Temperature Scanner at blue bands. The accuracy of the Rayleigh can affect the performance of the AC mainly due to the largest part in the satellite-received radiance of the UVI. The selections of different volume scattering phases can cause about 1% of MRE in the generation of lookup table of Rayleigh varying with the solar and viewing angles. The ozone concentrations, sea surface winds, and atmospheric pressure of the global daily climatology have been generated and used to estimate the Rayleigh-scattering at the ultraviolet bands. The ozone concentrations can cause about 2% of MRE with about 3% for winds and 3% for pressure on the global Rayleigh distributions. The products are now available in the website for the oceanography study.

Source: Science of Remote Sensing

DOI: 10.1016/j.srs.2025.100349