Avaliação da fração de radiação fotossinteticamente ativa absorvida pela floresta tropical primária na Amazônia durante a estação seca dos anos de 2002 e 2007
The fraction of absorbed photosynthetically active radiation (fAPAR) by vegetation is an important variable in modeling biosphere-atmosphere interaction, for example, to estimate carbon assimilation by vegetation. This determination from surface measurements is limited to extremely small areas. The use of remote sensing techniques on board artificial satellites represents an important alternative for obtaining such a fraction on a global scale and long term. However, because of it, satellite procurement be made indirectly, based on models of vegetation, radiative transfer algorithms and mainly due to the influence of atmospheric transmission of solar radiation at the top of the atmosphere to the surface and vice versa, it is crucial validation from other techniques. This work is focused on the validation of fAPAR derived from measurements of the MODIS (Moderate Resolution Imaging Radiometer) aboard the Terra and Aqua satellites from estimates made in comparison with the surface during two intensive field experiments conducted during the dry season of 2002 and 2007 in the Biological Reserve Jaru, RO Brazil.Pages: 6019-602
