干旱区生态环境知识资源中心

The solar energy assessment in SWERA project was prepared by using BRASIL-SR radiative transfer model and satellite database acquired from 1995 till 2005 - a full decade dataset. The annual and seasonal maps prepared were in 10X10km spatial resolution. In spite of the different climate characteristics along the Brazilian territory, one can observe that the annual average of daily solar irradiation is fairly uniform. The maximum daily global solar irradiation value (6.5 kWh/m(2)) occurs in the semi-arid climate area of Brazilian Northeastern region. The lowest daily global solar irradiation (4.25 kWh/m(2)) occurs on the shore of Southern region of Brazil. The Amazon region receives lower solar irradiation during the summer than the Southern region. The variation of the solar irradiation between winter and summer is smaller in the Northern region than in the Southern. The Central region of Brazil bets a larger incidence of solar radiation during the dry season when the precipitation is low and the number of clear sky days is larger.