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热带西太平洋暖池异常东伸与热带东太平洋增温

, PP. 35-42

Keywords: 热带西太平洋暖池,西风暴发,温度平流,增温,厄尔尼诺

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Abstract:

本文利用“ClimateDiagnosticsBulletin”、“OceanographicMonthlySummary”、美国夏威夷水位中心提供的资料以及TOGA-COAREIOP资料,分析了1992~1993厄尔尼诺事件中西太平洋暖池、东太平洋SST对异常风场的响应,结果指出:由于西风暴发而引起的西太平洋暖水向东输送,不仅导致西太平详水位降低,而且导致温跃层显着升高,进而引起上层海水热含量显着减少,这种减少在温跃层更为明显.东太平洋与此相反,热含量与温跃层深度出现正距平,正距平中心出现时间比西太平洋的负距平均晚两个月;暖池28℃等温线的异常东伸是海流对低空西风异常直接响应的结果,定量估算表明,纬向流异常所引起的温度平流是暖池28℃等温线异常东伸的主要动力,是热带东太平洋异常增温的主要原因之一.

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