东亚土地覆盖对ENSO事件的响应特征

对1982—1993年气候年际变化的强信号——ENSO进行了确认及再分类。以美国地质调查局EROS中心提供的AVHRR 8km NDVI为数据源，应用地理信息系统技术，计算了1982—1993年每年夏季(5—9月)NDVI平均影像。在此基础上用数据断面分析法对ENSO年东亚地区土地覆盖的空间分布进行了分析，再用主成分分析法对同一时间序列NDVI平均影像进行了运算，发现其第7主成分影像所反映的土地覆盖分布与数据断面分析法所反映的结果是一致的。对此，进一步分析了第7主成分的特征向量与代表ENSO变化特征的南方

Characteristic of East Asian Land Cover's Response to ENSO Events

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.