热带太平洋海气耦合过程对印度洋年际变化的影响

冯俊乔1,2,3,白学志1,2

热带太平洋海气耦合过程对印度洋年际变化的影响

冯俊乔1,2,3,白学志1,2

中国科学院海洋研究所,山东青岛 266071;2. 中国科学院海洋环流与波动重点实验室,山东青岛 266071;3. 中国科学院研究生院,北京 100049

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摘要

摘要: 利用中等复杂程度的2.5层海洋模式和大气环流模式ECHAM4组成的海气耦合模式，模拟分析了热带太平洋和印度洋的气候变化以及年际变化特征。该模式较好地模拟了ENSO现象的空间分布及其不规则的周期变化特征，以及热带印度洋的主要变化特征。通过数值试验，初步研究了太平洋耦合过程对印度洋年际变化的影响。结果显示，当存在太平洋耦合过程时，模拟的印度洋偶极子(IOD)正(负)事件的发生频率比无太平洋耦合情形时有所减少(增加)。该变化是太平洋耦合变量通过海气耦合过程对印度洋海表面平均风场进行调整，进而引起热带印度洋温跃层深度东西梯度改变的结果。
- 海洋科学 /
- 印度洋偶极子 /
- 海气耦合模式 /
- 热带太平洋 /
- ENSO

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