热带太平洋和印度洋海温年际变化的均方差分析

MEAN SQUARE DEVIATION ANALYSIS OF SST INTERANNUAL VARIABILITY IN TROPICAL PACIFIC AND INDIAN OCEAN

运用1951～1997年热带（20°N～20°S,50°E～80°W）海温（SST）资料求出其各月的均方差,结果表明:太平洋海温变化相对印度洋海温变化要明显,特别是赤道中东太平洋附近 （165～90°W,6°N～6°S）的海温变化比较显著,其海温的变化范围在2～4°C左右,3～4月份海温年际变化小,11～12月海温年际变化大;“暖池”附近洋面海温年际变化也小。而印度洋海域的海温变化范围在1～2°C左右,在印度洋南半球洋面海温变化比北半球洋面海温变化相对较大。同时,根据上述海温变化特征确定了几个海温年际变化最大的关键区。

Using the SST data series in tropical ocean (20 °N^20 °S, 50 °E^80 °W) during 1951~ 1997 to calculate its monthly mean square deviation, the work obtains results showing that interannual SST variability of the Pacific is more significant than that of the Indian Ocean, especially near the central and eastern equatorial Pacific (165~90 °W, 6 °N^6 °S), where it ranges from 2 ℃ to 4 ℃. The interannual SST variability is obvious in November and December but small in March and April. The interannual variability of 'warm pool' SST is not so obvious as that of the eastern equatorial Pacific. However, interannual SST variability ℃ the Indian Ocean ranges from 1 ℃ or so, being smaller than that of the Pacific. Inthe Indian Ocean, interannual SST variability of the Southern Hemisphere is more obvious than that of the Northern Hemisphere. According to above characteristics of interannual SST variability, the key sectors are determined.