Decadal Variation of the Indian Ocean Dipole

印度洋偶极子的年代际变化

• 批准号: 17204040
• 负责人: YAMAGATA Toshio
• 金额: $ 26.79万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17204040/
• 关键词: Indian Ocean Dipole; Decadal Variation; E1 Nino; Southern Oscillation; Indonesian Throughflow; Mascarene High; Agulhas Current; Coupled GCM; Tropical Indian Ocean

The processes that affect the decadal variation of the Indian Ocean Dipole (IOD) are investigated.1) Using outputs from a high-resolution coupled general circulation model (CGCM), decadal modulations of El Nino/Southern Oscillation (ENSO) is examined. Changes in the phase-locking nature of the ENSO to the seasonal cycle are shown to play an important role in the decadal modulation of the ENSO. This, in turn, modulates the heat transport by the Indonesian Throughflow, and thus the occurrence of the IOD.2) Heat budget analysis using the above model outputs has revealed that the occurrence of IOD events is governed by variations in the southward Ekman heat transport across 15°S, which is strongly linked with the Mascarene high activities.3) To understand the variability of the Agulhas Current, which influences the heat budget of the Indian Ocean, the interannual variation in the west coast of Africa is studied. It is found that the Angola Dome located in the above region undergoes significant interannual variations associated with the Atlantic Nino, which is a major climate mode in the tropical Atlantic.4) Since understanding of the past IOD is useful in understanding the current and future variability of the IOD, atmospheric general circulation model (AGCM) experiments with the permanent IOD and E1 Nino condition seen in Pliocene are conducted. The heat absorption from the atmosphere to the ocean in the tropics and the heat release from the ocean to the atmosphere in the mid-latitude are significantly reduced under this condition.

使用高分辨率耦合的Neral Crockulation模型（CGCM）的输出，研究了decadal变化的过程（IOD）。季节性周期的锁定性质是在十年模块化中发挥重要作用。由跨15°S的南部埃克曼（Ekman）饮食运输的变化所约束，这与玛斯加林高活动密切相关。3）了解影响印度洋的Agulhas电流的可变性，这会影响印度洋，这是西海岸的际变化在上述地区的安哥拉圆顶进行了研究在这种情况下，在植光的大气中看到了永久性的IOD和E1 NINO条件，并从大气中释放了热情。

项目成果

The influence of tropical Indian Ocean SST on the Indian summer monsoon

• DOI: 10.1175/jcli4161.1
• 发表时间: 2007-07-01
• 期刊: JOURNAL OF CLIMATE
• 影响因子: 4.9
• 作者: Cherchi, Annalisa;Gualdi, Silvio;Navarra, Antonio
• 通讯作者: Navarra, Antonio

Termination of Indian Ocean Dipole Events in a Coupled General Circulation Model

耦合大气环流模型中印度洋偶极子事件的终止

• 发表时间: 2007
• 期刊: J. Climate 20(13)
• 作者: Rao;S. A.
• 通讯作者: S. A.

インド洋-太平洋域の気候変動の観測と予測

印度洋-太平洋地区气候变化观测与预测

• 发表时间: 2007
• 期刊: 月刊海洋 39 (10)
• 作者: 土志田正二;千木良雅弘;山形俊男
• 通讯作者: 山形俊男

E1 Nino Modoki and its possible teleconnection

E1 Nino Modoki 及其可能的遥相关

• 发表时间: 2007
• 期刊: J. Geophys. Res. 112
• 作者: Ashok;K.
• 通讯作者: K.

Abnormal weather and climate variation

异常天气和气候变化

• 发表时间: 2008
• 作者: Yamagata;T.
• 通讯作者: T.