The Analysis of Spatial and Temporal Characteristics of Sea Surface Temperature Anomaly in the Indian Ocean during Last 50 Years
近50年热带印度洋海温距平场的时空特征分析

The diagnostic studies for the characteristics of spatial and temporal distribution of annual and seasonal mean sea surface temperature anomaly in the India Ocean are made with EOF by using 48 years data. The results show that there are three kinds of spatial distributions: (1) annual and seasonal variation in all areas is consistent; (2) west-east distribution; (3) north-south distribution. At the same time, the studies show that the significant characteristics of hierarchical changes of 48 years sea surface temperature is from cold to warm. 1950s～1960s is a cold phase period and 1980s～1990s is a warm phase period, whereas 1970s is a transition period from cold to warm. The second main characteristic reveled the interannual change of the Indian Ocean SST and was closely related with ENSO event.