Abstract
Clouds are the main tropospheric agent in the modulation of solar ultraviolet (UV) radiation in the Earth's surface. Clouds produce both attenuation and enhancement of radiation. This work shows how the local cloud cover (LCC) can partially explain mismatches between overpass satellite and ground-based instruments in the erythemal dose rate (EDR) for an urban, tropical site in Southern Hemisphere. Best agreement occurs for the scarcer cloud cover of winter. The Ozone Monitoring Instrument (OMI) EDR is on average 15% higher than ground-based measurements for cloudless skies. This value is due to both OMI algorithm misconception about aerosols and instrumental uncertainty.
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