Effects of different type of clouds on the surface UV-B and total solar irradiance at southern mid-latitudes: CMF determination at Córdoba, Argentina.

MARIA L. LÓPEZ; GUSTAVO G. PALANCAR; BEATRIZ M. TOSELLI

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2009 p. 3130 - 3130

he effect of clouds on total and UV-B irradiance in Córdoba, Argentina, was studied employing the TUV 4.1 model and measurements obtained with YES UVB-1 and YES TSP-700 radiometers, and a spectral radiometer Ocean Optics USB-4000. The experimental measurements were selected from a 10 years dataset (1998-2008). Clouds were classified by direct observation as cirrus, cumulus, and stratocumulus. The broadband Cloud Modification Factors (CMF) have been calculated in the range of the total and the UV-B radiation for these types of clouds. The relations between them were analyzed. The CMF values range from around 0.2 up to 1.2, depending on the wavelength interval and on the cloud type. The CMFUVB versus CMFT plots for different clouds have shown good adjustments and significant differences, which allows the distinction between them. Stratocumulus and cumulus clouds show linear fits with slopes around 1.25 and 0.6, respectively. Cirrus clouds plots present a variable behavior depending on t