近赤道太平洋表层和斜温层海温的变化与ENSO

用ＮＭＣ１９８２～１９９３年海洋再分析资料集，分析近赤道太平洋（１０°Ｓ～１０°Ｎ）海洋上层（０～４００ｍ）温度的季节和年际变化特征。分析揭示，上层海温的年际变化比季节变化大。在ＥＮＳＯ年或反ＥＮＳＯ年，由于斜温层深度变化大，斜温层附近的海温异常比海表还大，无论在西太平洋暖水区，还是东太平洋冷水区，斜温层附近温度距平都可达±７°℃以上，而且西太平洋暖水区的最大异常出现在赤道两侧４°～９°区域。

The Sea Temperature Variation from Sea Surface to Thermocline in the Equatorial Pacific and Its Relation with ENSO

Using NMC reanalyzed ocean dataset in 1982~1993, the interannual and seasonal variations of upper level (0~400 m) in the equatorial Pacific (10oS~10oN) are analyzed. The analyses suggest the interannual variation of upper level temperature is larger than that of seasonal variation. In El Nino or La Nina year, the temperature anomalies near thermocline are more significant than those in sea surface since the depth of thermocline changes rapidly. The temperature anomalies near thermocline both in western warm pool and eastern cold tong can reach 7oC or above. In the warm pool the extreme anomalies are often in both side of the equator (4o~9o).