热带太平洋表面水温信息区的确定及其特征

DETERMINATION AND CHARACTERISTICS OF THE SEA SURFACE TEMPERATURE IN THE INFORMATION AREAS IN THE TROPICAL PACIFIC OCEAN

海洋对大气环流大尺度变化的影响,是研究气候异常的重要基础,而海洋信息区是海气相互作用的关键区,它的温度变化在很大程度上可以反映海洋热状况的大尺度变化。本文,根据1950～1979年热带太平洋(42°N～42°S,130°E～80°W)的表层水温资料(COADS),采用两次相关计算标准信息量指标的方法确定了信息区;讨论了各信息区的水温与全区水温同期相关的特征,对研究气候异常提供了海洋热力基础。

Thermal influence of the ocean on the large-scale changes of atmospheric circulation is an important basis for studying climate anomaly. However, an oceanic information area is the key area of air-sea interaction, where the variation of temperature can reflect the large-scale changes of atmospheric thermal condition to a great extent. In this paper, based on the data of the sea surface temperature (COADS) in the tropical Pacific Ocean (42°N～42°S, 130°E～80°W) in 1950～1979, the information areas are determined by the method of using two-times correlation to calculate the indexes of standard information quantity. Meanwhile, the features of the synchronous relationship between the water temperature in the information areas and in the whole areas are discussed. Besides, the characteristics of the large scale changes of the ocean thermal condition in the investigation areas are pointed out. These findings provide the ocean thermal basis for the study of climate anomaly.