Amazon vegetation greenness as measured by satellite sensors over the last decade

摘要: [1] During the last decade two major drought events, one in 2005 and another 2010, occurred Amazon basin. Several studies have claimed ability to detect effect of these droughts on vegetation response, measured through satellite sensor indices (VIs). Such monitoring capability is important as it potentially links climate changes (increasing frequency severity drought), response observed greenness, land-atmosphere carbon fluxes which directly feedback into global change. However, we show conclusively that not possible from space using VIs. We analysed 11 years dry season (July–September) Moderate Resolution Imaging Spectroradiometer (MODIS) enhanced index (EVI) normalised difference (NDVI) images. The VI standardised anomaly was alongside absolute value EVI NDVI, values for were compared with those non-drought years. Through a series analyses, anomalies shown be similar magnitude Thus, while may respond drought, this detectable satellite-observed greenness. A significant long-term decadal decline reported, independent occurrence drought. This trend caused by environmental or noise-related factors require further investigation.