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The energy available for physical, chemical and biological processes on the planet is not entirely consumed by what the sun provides during the day. Part of this energy is returned to the space through reflection , initially by the atmosphere , along with the clouds , and lastly, the surface coverage. This work studied the influence of sky coverage on reflection coefficients of the global radiation. Photosynthetically active (PAR) and infrared (IR) radiation were measured during two periods, dry and rainy, in a region of the Cerrado stricto sensu Cuiaba. These radiation measurement from May 2009 to April 2010 were downloaded and configured with the aid of a calculation procedure for non-parametric confidence interval by bootstrap. The study found that the sky coverage did not contribute to the change in albedo of global radiation during the periods studied, while the reflection of radiation PAR and IV only influenced the atmosphere in variability during the rainy season. As the coverage afforded by this change only occurred during the rainy season, it is believed that the reflection of IR radiation in the presence of higher moisture in the atmosphere and the leaf surface has contributed to the PAR radiation. It is also believed that the change itself is the same intensity under different cover types in the rainy season and may have affected the photosynthetic mechanism of vegetation, thereby altering the reflection of radiation PAR.

VARIAÇÃO DA REFLEXÃO DE DIFERENTES ONDAS DE UMA REGIÃO DE CERRADO DA BAIXADA CUIABANA SOB DIFERENTES COBERTURAS DO CÉU