Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x..76c&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 24, pp. 76-1, CiteID 2223, DOI 10.1029/2002GL015708
Physics
8
Atmospheric Composition And Structure: Cloud Physics And Chemistry, Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Climatology (1620)
Scientific paper
Ultraviolet (UV) erythemal and total (300-3000 nm) irradiance measurements of the Argentine Servicio Meteorológico Nacional Network were related to ground-based cloud observations. No geographical dependence was observed in the effects of each cloud-type on the irradiance, from tropical to Antarctic regions. For overcast conditions, median transmittance percentages with respect to the clearsky situation of 81%, 44% and 36% at high, medium and low clouds respectively for erythemal irradiance, and 83%, 30% and 23% for total irradiance were determined, similar to results at mid-latitudes of the Northern Hemisphere. Irradiance enhancement by broken cloud fields is more pronounced from 5 to 7 octas cloud coverage and can last even hours, with peak instantaneous values of 113% for erythemal and 133% for total irradiance, with respect to the very clean clearsky situation. In each case, the total irradiance is usually more attenuated and also more enhanced by clouds than the erythemal irradiance.
Blumthaler Mario
Cede Alexander
Luccini Eduardo
Nunez Liliana
Piacentini Rubén D.
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