Ozone Monitoring Instrument satellite UV irradiance product correction using a global aerosol climatology

摘要

Lately a number of studies related with UV irradiance estimates from satellite data based on the Ozone Monitoring Instrument (OMI) have shown a high correlation with ground-based measurements but a positive bias in many locations, the satellite derived UV being higher. One of the key factors that this bias has been attributed to is the boundary layer aerosol absorption not taken into account in the current OMI UV algorithm. In this work we have used a correction procedure based on climatological global aerosol absorption data taken from AeroComm aerosol initiative. This dataset includes aerosol optical depth and aerosol single scattering albedo assembled by combining, ground-based aerosol measurements from AERONET and information from several global aerosol models. The results of this correction were compared with synchronous ground-based measurements from 9 UV monitoring stations. The results generally showed a significantly reduced bias of 7-20%, a lower variability, and an unchanged, high correlation coefficient.