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Results of an experimental campaign that took place in the greaterThessaloniki area were used to investigate temporal and spatial UVvariability within an OMI satellite pixel. UV irradiance and aerosol opticaldepth measurements were performed for a one month period at three sitescharacterized as urban, rural and industrial, depending on their locationand possible local aerosol sources. OMI showed a general UV irradianceoverestimation compared to all three sites and for all atmosphericconditions. During the campaign the standard deviation calculated from thethree sites for UV irradiance at 324 nm was of the order of 26%. Forcloudless days with high spatial aerosol variability, UV differences reached±20% within the OMI pixel. For cloudy days UV differences up to100% were found at the three sites, a percentage that depends on theground-based data integration time used for the comparison. Here we tried tofocus on the limitations when trying to interpret results of UV irradiancecomparisons between OMI satellite and ground based stations, taking intoaccount the UV variability within an OMI pixel, due to such small scalespatial cloud and aerosol inhomogeneities

Spatial and temporal UV irradiance and aerosol variability within the area of an OMI satellite pixel