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The results indicated that the effect caused by the El Nino event in the various types of vegetation i n the semi-arid region of Northeast Brazil during the last two decades of the last century, presented a differing seasonal and interannual patterns from the vegetati on types in the African Sahel. The seasonal amplitu de of Normalized Difference Vegetation Index - NDVI variation in the African Sahel was not altered by the cl imatic effect of El Nino, however, in the semi-arid region of Northeast Brazil, the vegetation types were aff ected during the El Nino events. Furthermore, it was observed th at the NDVI varies according to the local climatic conditions, presenting a temporal gap between the precipitation occurrence and water absorption available from the vegetation. This information is important to show c ontour conditions for climatic models and also for the weather numerical forecasting.

revista brasileira de geografia física

Analysis of the NDVI Temporal Dynamics in Semi-arid Ecosystems: Brazilian Caatinga and African Western Sahel (Análise da Dinâmica Temporal do NDVI nos Ecossistemas Semi-áridos: Caatinga Brasileira e Sahel Ocidental Africano)