An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates

作者：Juseon Bak, Xiong Liu, Kai Yang, Gonzalo González Abad, Ewan O’Sullivan, K. Chance, Cheol‐Hee Kim · 发表于：Atmospheric measurement techniques · 年份：2024 · DOI：10.5194/amt-17-1891-2024 · 被引用次数：10 · 研究领域：Atmospheric Ozone and Climate、Atmospheric chemistry and aerosols、Air Quality Monitoring and Forecasting

Abstract. We describe the new and improved version 2 of the ozone profile research product from the Ozone Monitoring Instrument (OMI) on the Aura satellite. One of the major changes is to switch the OMI L1b data from collection 3 to the recent collection 4 as well as the accompanying auxiliary datasets. The algorithm details are updated on radiative transfer model calculation and measurement calibrations, along with the input changes in meteorological data, and with the use of a tropopause-based ozone profile climatology, an improved high-resolution solar reference spectrum, and a recent ozone absorption cross-section dataset. A super Gaussian is applied to better represent OMI slit functions instead of a normal Gaussian. The effect of slit function errors on the spectral residuals is further accounted for as pseudo-absorbers in the iterative fit process. The OMI irradiances are averaged into monthly composites to reduce noise uncertainties in OMI daily measurements and to cancel out the temporal variations of instrument characteristics that are common in both radiance and irradiance measurements, which was previously neglected due to use of climatological composites. The empirical soft calibration spectra are re-derived to be consistent with the updated implementations and derived annually to remove the time-varying systematic biases between measured and simulated radiances. The “common mode” correction spectra are derived from remaining residual spectra after soft calibrati...