研究目的
To derive on-orbit slit functions from OMI solar observations and evaluate their implications for ozone-profile retrieval.
研究成果
The derived on-orbit slit functions show U-shaped cross-track dependences in the UV bands that cannot be fully represented by preflight slit functions. Applying these slit functions to ozone-profile retrieval shows substantial improvements over preflight slit functions based on comparisons with ozonesonde validations.
研究不足
The study assumes the high-resolution solar reference spectrum stays constant, which may not hold near deep solar lines and at short wavelengths in the UV. The impact of scene heterogeneity, differences in stray light between irradiance and radiance, and intra-orbit instrumental changes on slit functions is not fully characterized.
1：Experimental Design and Method Selection:
The study involves deriving on-orbit slit functions by fitting OMI irradiance spectra with a high-resolution solar reference spectrum and various assumed slit function forms.
2：Sample Selection and Data Sources:
OMI solar irradiance data from 2004 to 2016 are used.
3：List of Experimental Equipment and Materials:
OMI instrument data, high-resolution solar reference spectra.
4：Experimental Procedures and Operational Workflow:
Slit functions are derived by fitting observed solar irradiance with assumed function forms, including standard and super-Gaussian functions and a stretch to preflight slit functions.
5：Data Analysis Methods:
A weighted Levenberg–Marquardt nonlinear least-square algorithm is used to minimize the sum of squares of fitting residuals weighted by OMI spectral uncertainties.
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