This study aims at improving the understanding of the behaviour of vegetation in Brazil due to the regional influences of climatic events, specifically the El Nino-Southern Oscillation (ENSO). To accomplish this we used a set of filtered data from the European Fourier-Adjusted and Interpolated
Normalized Difference Vegetation Index (EFAI-NDVI), generated by the Advanced Very High Resolution Radiometer (AVHRR), along with the Vegetation Condition Index (VCI), with spatial resolution of 0.1° × 0.1° and temporal resolution of 10 days, covering the period from 1995 to
1999. Through analysis of these time series based on principal components transformation, we evaluated the influence and location of the ENSO effects in both datasets. The results show teleconnection patterns between climatic conditions in the Pacific Ocean and vegetation in specific locations
in Brazil. Principal component 9 of the EFAI-NDVI presented significant correlations with the Southern Oscillation Index (SOI), R = -0.48, and with the Multivariate ENSO Index (MEI), R = 0.62, at p < 0.01. For the VCI, principal component 3 showed the greatest relations with the SOI, R
= 0.45, and MEI, R = -0.51, at p < 0.01. The use of VCI has not improved the response of the ENSO's teleconnection in relation to NDVI. The eigenvector field of component EFAI-NDVI indicated a greater influence of the phenomenon, mainly in the north, north-east and parts of the southern
regions of the country. These findings show that data on plant cover reflectance captured by polar orbit satellites can be used as indicators of interannual climatic variability.
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Document Type: Research Article
Brazilian Institute of Geography and Statistics (IBGE), Rio de Janeiro, RJ, Brazil
Meteorology Department, Geosciences Institute (IGEO), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
Technology Institute (IT), Federal Rural University of Rio de Janeiro (UFRRJ), Seropedica, RJ, Brazil
EMBRAPA, Corn and Sorghum Research Unit, Sete Lagoas, MG, Brazil
Publication date: 01 March 2010
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