| 热带太平洋西风异常对ENSO事件发生的作用 |
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| 引用本文： | 傅云飞,黄荣辉.热带太平洋西风异常对ENSO事件发生的作用[J].大气科学,1996,20(6):641-654. |
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| 作者姓名： | 傅云飞 黄荣辉 |
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| 作者单位： | 中国科学院大气物理研究所,北京 100080 |
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| 基金项目： | 本研究在中科院重大项目KY-85-10资助下完成 |
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| 摘 要： | 本文从观测资料对80年代两次ENSO事件产生过程中，热带太平洋西风异常及其对赤道中、东太平洋表层海温增暖的作用进行了分析和比较。分析结果表明:在这两次ENSO事件的产生过程中，赤道西太平洋上空均有较大的西风异常，并且它由赤道西太平洋向赤道中、东太平洋传播，随着西风异常从西向东传播，赤道中、东太平洋的表层相继增温。分析还表明，1982／1983年ENSO事件发生过程中，热带太平洋西风异常的强度要比1986／1987年热带太平洋西风异常强得多，这使得1982／1983 ENSO事件的强度比1986／1987_ENSO事件强得多。为了说明热带西太平洋西风异常对赤道中、东太平洋ENSO事件发生的作用，本文还利用IAP太平洋环流模式对西风异常在ENSO事件产生过程中的作用进行了数值模拟。模拟的结果说明了热带太平洋的西风异常对赤道太平洋暖水的向东传播和赤道中、东太平洋的增温起了很重要作用，这与观测事实分析一致。
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| 关 键 词： | 西风异常 ENSO事件 海表温度 |
The Effect of the Westerly Anomalies over the Tropica Pacific on the Occurrence of ENSO Events |
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| Fu Yunfei and Huang Ronghui.The Effect of the Westerly Anomalies over the Tropica Pacific on the Occurrence of ENSO Events[J].Chinese Journal of Atmospheric Sciences,1996,20(6):641-654. |
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| Authors: | Fu Yunfei and Huang Ronghui |
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| Abstract: | This paper analyzes the westerly anomalies over the tropical Pacific and their effect on the warming of the sea surface temperature (SST) in the equatorial central and eastern Pacific in the processes of two ENSO events, occurred in the 1980's and compares them using the observed data. The analyzed results show that in the occurring processes of these two ENSO events, there were the larger westerly anomalies over the equatorial western Pacific and they propagated from the equatorial western Pacific toward the equatorial central and eastern Pacific. With the propagation of the westerly anomalies from the east to the west, the sea surface of the equatorial central and eastern Pacific was successively warming. The analyzed results also show that the strength of the westerly anomalies in the occurring process of the 1982/1983 ENSO event was stronger than that in the occurring process of the 1986/1987 ENSO event resulting in a much stronger ENSO event during 1987/1983 than the 1986/1987 ENSO event. In order to explain the effect of the westerly anomalies over the tropical western Pacific on the occurrence of ENSO events in the equatorial central and eastern Pacific, the IAP Pacific General Oceanic Circulation Model (IAP-POGCM) is used to simulate numerically the effect of the westerly anomalies on the occurrence of ENSO event. The simulated result shows that the westerly anomalies over the tropical Pacific play an important role in the eastward propagation of the warm sea water in the equatorial Pacific and the warming in the equatorial central and eastern Pacific. |
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| Keywords: | westerly anomaly ENSO event sea surface temperature |
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