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COLLADOS, Eugenio; sanchez, Rodrigo. Global radiation: energy budget and heat island mitigation in Santiago de Chile. In: CONFERENCE ON PASSIVE AND LOW ENERGY ARCHITECTURE, 20., 2003, Santiago do Chile. Anais... Santiago do Chile, 2003.
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Abstract

Climate in Santiago de Chile (-33° lat) is Mediterranean with a long dry season. Monthly average Global Radiation exceeds 200 W/m2 during at least 6 months due to low cloudiness, resulting in heat flows dominated by clear sky radiation exchange. Some factors affecting energy budget at surface level were investigated. A profile of global reflectance (0.3 to 2.8 µm) was measured along an 80 km path at 4,500 feet altitude during Summer solstice. The measured values (in the range 0.13 to 0.20) were compared to ground surface type classified in 4 categories and visually assessed from samples of visible and IR Landsat images along the path. Correlation between reflectance, land cover percentage and IR bands were found for each category. Vegetation was found positively correlated to reflectance and low rise built areas were found negatively correlated. High rise built areas were found weakly correlated to reflectance. Differences between IR profile and global reflectance profile can be explained by the fractions of absorbed heat that are either transferred to air or absorbed by evaporation through irrigated soil and vegetation. Heat stored in ground warm-up is not a significant factor of the energy budget. Also energy dissipated from human activities is not the main energy source of the heat island. The feasibility of modifying the heat gain from radiation absorption is evaluated, concluding that increasing surface reflectance, surface irrigation and vegetation cover would be effective ways of mitigating or reversing the current heat island effect.
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