Characteristic of East Asian Land Cover''s Response to ENSO Events
东亚土地覆盖对ENSO事件的响应特征

This study has confirmed and reclassified the ENSO events, which are considered as the strong signal of interannual climate variation, during 1982 to 1993. Based on the AVHRR NDVI database, which are offered by USGS EROS data center and have 8km spatial resolutions and 10 days temporal resolutions, calculated annual averaged NDVI images of 5-9 months during 1982 to 1993 using GIS technology. With the averaged NDVI images, the spatial distribution of east Asian land cover in ENSO years using Data Profile Analysis method. At the same time, applied Primary Component Analysis method made calculations on same time series NDVI images ,and identified the spatial distribution of land cover reflected by the 7th component of PCA analysis is the same as the results of Data Profile Analysis. Furthermore, the relationship of the eigenvector of the component 7 and Southern Oscillation index(SOI), which represents the characteristic of ENSO changes, during 1982 to 1993, and the characteristic of spatial distribution of east Asian land cover's interannual changes which are being driven by changes of ENSO events was summarized.