%0 Journal Article
%T Characterization of meteorological parameters, solar radiation and effect of clouds at two antarctic sites, and comparison with satellite estimates Caracterizaci車n de par芍metros meteorol車gicos, radiaci車n solar y efecto de las nubes en dos sitios ant芍rticos, y comparaci車n con estimaciones satelitales
%A Eduardo A. Luccini
%A Hugo Grossi Gallegos
%A Rub谷n D. Piacentini
%A Pablo O. Canziani
%J Meteorologica
%D 2005
%I Centro Argentino de Meteor車logos
%X The analysis of measurements of daily mean temperature, daily mean relative humidity and daily total solar irradiation for the period 1979-1985, at the Antarctic stations Almirante Brown (64.9oS, 62.9oW, 10m a.s.l., West of Antarctic Peninsula), and BelgranoII (77.9oS, 34.6oW, 250m a.s.l., East of Antarctic Peninsula) is presented. A short-term characterization of monthly averages was established. Typical temperatures for summer and winter were 2oC and -7oC respectively at Brown, and -2oC and -20oC at BelgranoII. Relative humidity was always above 60% at both stations. Both measured parameters enter also as input variables in model calculations of the equivalent clear-sky daily total irradiation for each day, to determine the effective cloud transmittance of solar radiation. The effect of cloudiness was stronger at Brown, where an average cloud transmittance of 49% was determined, while it was of 71% at BelgranoII. Average daily irradiation of 27.4MJ/m2 in December at BelgranoII is within the highest reported world-wide. Also, some days show increases in the daily irradiation over 20% than that expected for clear-sky conditions. Antarctic solar irradiation levels are considerably higher than in the Arctic. Ground-based data are compared with the satellite database from NASA Surface Meteorology and Solar Energy Data Set. Se presenta el an芍lisis de mediciones de temperatura media diaria, humedad relativa media diaria e irradiaci車n solar total diaria, realizadas en el periodo 1979-1985 en las Bases Ant芍rticas Almirante Brown (64.9oS, 62.9oO, 10m s.n.m., Oeste de Pen赤nsula Ant芍rtica) y BelgranoII (77.9oS, 34.6oO, 250m s.n.m., Este de Pen赤nsula Ant芍rtica). Se estableci車 una caracterizaci車n de corto plazo sobre medias mensuales. Las temperaturas t赤picas en verano e invierno fueron 2oC y -7oC respectivamente en Brown, y -2oC y  20oC en BelgranoII. La humedad relativa fue siempre sobre 60% en ambas estaciones. Estos dos par芍metros entran como variables en c芍lculos de la irradiaci車n solar diaria equivalente a cielo despejado, para determinar la transmitancia efectiva de radiaci車n solar por nubes. El efecto de nubes fue mayor en Brown, con transmitancia efectiva media de 49%, respecto del 71% en BelgranoII. La irradiaci車n media de 27.4MJ/m2 en diciembre en BelgranoII es de las m芍s altas registradas en el mundo. Asimismo, algunos d赤as muestran incrementos de irradiaci車n por sobre un 20% de la esperada para cielo despejado. La irradiaci車n solar media en Ant芍rtida es considerablemente mayor que la registrada en el 芍rtico. Se comparan las mediciones con datos satelit
%K Climatolog赤a
%K Pen赤nsula Ant芍rtica
%K Radiaci車n solar
%K Meteorolog赤a
%K Nubes
%K Climatology
%K Antarctic Peninsula
%K Solar radiation
%K Meteorology
%K Clouds
%U http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1850-468X2005000100002