Determination of atmospheric parameters to estimate global radiation in areas of complex topography: Generation of global irradiation map

摘要: Incoming shortwave solar radiation is an important parameter in environmental applications. A detailed spatial and temporal analysis of global on the earth surface needed many applications, ranging from energy uses to study agricultural, forest biological processes. At local scales, topography most factor distribution surface. The variability elevation, orientation obstructions due elevations are a source great differences insolation and, consequently, other variables as ground temperature. For this reason, several models based GIS techniques have been recently developed, integrating obtain surface. In work, analyzed with Solar Analyst, model implemented ArcView, that computes topographic parameters: altitude, latitude, slope (azimuth) shadow effects. Analyst input parameters diffuse fraction transmittance. These not usually available radiometric networks mountainous areas. In method both proposed. Global data obtained two stations used: one located Sierra Magina Natural Park (Spain) 11 another surroundings Nevada 14 stations. Daily irradiation calculated digital terrain (DTM), daily fraction, K, atmospheric transmittivity, τ. Results provided by compared measured values. An overestimation for high observed, whereas low altitudes present underestimation. best performance was also reported during summer months, worst results were winter. Finally, yearly map has produced studied zone.