Interannual variability of NDVI over Africa and its relation to El Niño/Southern Oscillation

摘要: Abstract The array of Normalized Difference Vegetation Index (NDVI) products now being derived from satellite imagery open up new opportunities for the study short and long-term variability in climate. Using a time series analysis procedure based on Principal Components transform, sequence monthly Advanced Very High Resolution Radiometer (AVHRR)-derived NDVI 1986 through 1990, we examine trends vegetation greenness Africa evidence climatic trends. In addition to anticipated seasonal trends, identify signals interannual variability. most readily identified is one that periodically affects Southern Africa. It shown temporal loadings this component exhibit very strong relationship with El Nino/Southern Oscillation (ENSO) atmospheric pressure patterns Pacific, Pacific sea surface temperature (SST) anomalies, anomalous Outgoing Longwave Radiation (OLR). However, have also detected...