2014-05-13: Evaluation of broadband surface solar irradiance derived from the Ozone Monitoring Instrument
The OMI SSI algorithm is based on the Heliosat method and uses the OMI O2–O2 cloud product as main input. The OMI SSI data are validated against the globally distributed Baseline Surface Radiation Network (BSRN) measurements at 19 stations for the year 2008. Furthermore, the monthly mean OMI SSI data are compared to independent surface solar irradiance products from International Satellite Cloud Climatology Project Flux Data (ISCCP-FD) and Clouds and the Earth's Radiant Energy System (CERES) data for the year 2005.
The mean difference between OMI SSI and BSRN global (direct+ diffuse) irradiances is -1.2Wm2 (-0.2%), the root mean square error is 100.1Wm2 (18.1%), and the mean absolute error is 67.8Wm2 (12.2%). The differences between OMI SSI and BSRN global irradiances are smaller over continental and coastal sites and larger over deserts and islands. OMI SSI has a good agreement with the CERES shortwave (SW)model B surface downward flux (SDF) product. The correlation coefficient and index of agreement between monthly mean 1-degree gridded OMI SSI and CERES SW SDF are N0.99. OMI SSI is lower than CERES SW SDF which is partly due to the solar zenith angle. On average, OMI SSI is 13.5 W m2 (2.5%) lower than the ISCCPFD SW surface downward flux and the correlation coefficient and index of agreement are N0.98 for every month.
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