Decadal Variation of the Indian Ocean Dipole
印度洋偶极子的年代际变化
基本信息
- 批准号:17204040
- 负责人:
- 金额:$ 26.79万
- 依托单位:
- 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:
- 关键词:
项目摘要
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.
本文研究了印度洋偶极子(IOD)年代际变化的过程。1)利用高分辨率耦合大气环流模式(CGCM)的输出,研究了厄尔尼诺/南方涛动(ENSO)的年代际调制。ENSO与季节周期的锁相性质的变化在ENSO的年代际调制中起着重要的作用。这反过来又调节了印度尼西亚洋流的热量输送,从而调节了IOD的发生。2)使用上述模式输出的热量收支分析表明,IOD事件的发生受15°S范围内向南Ekman热量输送的变化所控制,这与Mascarene高活动密切相关。3)为了了解Agulhas海流的变化,影响印度洋热量收支的主要因素,研究了非洲西海岸的年际变化。研究发现,位于上述地区的安哥拉穹与大西洋Nino(大西洋Nino)有显著的年际变化,而大西洋Nino是热带南极洲的一种主要气候模态。4)由于对过去IOD的了解有助于了解IOD的当前和未来变化,因此利用大气环流模式(AGCM)对上新世的永久IOD和E1 Nino条件进行了试验。在这种条件下,热带地区从大气到海洋的热量吸收和中纬度地区从海洋到大气的热量释放都显著减少。
项目成果
期刊论文数量(265)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
El Nino Modoki and its possible teleconnection
- DOI:10.1029/2006jc003798
- 发表时间:2007-11-08
- 期刊:
- 影响因子:3.6
- 作者:Ashok, Karumuri;Behera, Swadhin K.;Yamagata, Toshio
- 通讯作者:Yamagata, Toshio
Interannual variation of oceanic conditions in the Guinea Dome simulated by an eddy-resolving ocean general circulation model
涡分辨海洋环流模型模拟几内亚穹顶海洋状况的年际变化
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:Doi;T.
- 通讯作者:T.
Indian Ocean Coupled Variability and Its Impact of Global Climate
印度洋耦合变率及其对全球气候的影响
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Yamagata;T.
- 通讯作者:T.
Toward predicting climate variations that bring us abnormal weather
预测给我们带来异常天气的气候变化
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Yamagata;T.
- 通讯作者:T.
Annual ENSO simulated in a coupled ocean-atmosphere model
在海洋-大气耦合模型中模拟年度 ENSO
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Tozuka;T.
- 通讯作者:T.
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YAMAGATA Toshio其他文献
YAMAGATA Toshio的其他文献
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{{ truncateString('YAMAGATA Toshio', 18)}}的其他基金
Long-term modulations of tropical climate modes and ocean warming
热带气候模式和海洋变暖的长期调节
- 批准号:
20340125 - 财政年份:2008
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Investigation of the Kuroshio variability south of Japan with special emphasis on scale interaction
日本南部黑潮变化的调查,特别强调尺度相互作用
- 批准号:
14340137 - 财政年份:2002
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Basic Research on Development of Ocan Prediction Models for Asian Marginal Seas
亚洲边缘海Ocan预报模型发展的基础研究
- 批准号:
11205205 - 财政年份:1999
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for Scientific Research on Priority Areas
Variability of Western Boundary Currents
西部边界流的变化
- 批准号:
07044068 - 财政年份:1995
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for international Scientific Research
Seasonal and interannual variations in the Indian Osean
印度海洋的季节和年际变化
- 批准号:
06452085 - 财政年份:1994
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Ocean Dynamics and Climate in the Western Pacific
西太平洋的海洋动力学和气候
- 批准号:
05044034 - 财政年份:1993
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for international Scientific Research
Studies on Annual and Interannual Variations of Oceanic Thermal Domes
海洋热穹年及年际变化研究
- 批准号:
03402015 - 财政年份:1991
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for General Scientific Research (A)
Studies on Global-Scale Air-Sea Interactions
全球尺度海气相互作用研究
- 批准号:
01044110 - 财政年份:1989
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for international Scientific Research
Seasonal and Interannual Variabilities of the Pacific Ocean Circulation and Their Relevance to ENSO
太平洋环流的季节和年际变化及其与 ENSO 的相关性
- 批准号:
63460046 - 财政年份:1988
- 资助金额:
$ 26.79万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
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