Mechanisms and Effects of Tropical Indian Ocean Variability

热带印度洋变化的机制和影响

• 批准号: 1305719
• 负责人: Shang-Ping Xie
• 金额: $ 23.86万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-11-01 至 2016-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1305719&HistoricalAwards=false
• 关键词: Mechanisms; Effects; Tropical; Indian; Ocean

A new concept of the tropical Indian Ocean (TIO) capacitor effect is emerging for interactions between the Indian and Pacific basins: El Nino teleconnection causes the TIO to warm, and the TIO warming persists and like a discharging capacitor, exerts climatic influences after El Nino decays. Studies of the capacitor effect so far tend to be diagnostic, and targeted model experiments are necessary to make further progress.This project will study ocean-atmospheric processes and mechanisms for the TIO response to El Nino/the Southern Oscillation (ENSO), especially the long persistence and climatic effects of this response during and after the decay of an ENSO event; and to explore interdecadal changes in TIO mean state and variability and determine their cause. A state-of-the-art coupled general circulation model will be used to conduct experiments and test hypotheses regarding the role of ocean Rossby waves in sustaining the TIO warming and moist teleconnection from the TIO to the Northwest Pacific via atmospheric Kelvin wave. Among teleconnective effects of the TIO warming are reduced precipitation over the subtropical Northwest Pacific (including the U.S. affiliated Northern Mariana Islands and Guam), and an anomalously active Meiyu-Baiu rainy season from eastern China to Japan. The proposed research represents a systematic investigation into the TIO's role in climate and will yield new insights into the mechanisms for TIO variability and changes. The successful completion of this project has the potential in improving understanding and prediction of climate variability and change, which benefits countries/communities within and rimming the TIO and Northwest Pacific. Graduate students and postdoctoral will be trained and supported.

热带印度洋（TIO）电容效应的一个新概念正在出现的印度和太平洋盆地之间的相互作用：厄尔尼诺遥相关导致TIO变暖，TIO变暖持续，像一个放电电容器，施加气候影响后，厄尔尼诺衰减。迄今为止，对电容效应的研究往往是诊断性的，为了取得进一步的进展，有必要进行有针对性的模式试验，本项目将研究海洋-大气过程和热带印度洋振荡对厄尔尼诺/南方涛动的反应机制，特别是这种反应在南方涛动事件衰减期间和之后的长期持续性和气候影响;探讨TIO平均状态和变率的年代际变化及其原因。一个最先进的耦合大气环流模式将被用来进行实验和测试假设的作用，海洋Rossby波在维持TIO变暖和潮湿的遥相关从TIO西北太平洋通过大气开尔文波。TIO变暖的遥相关效应包括亚热带西北太平洋（包括美国附属的北方马里亚纳群岛和关岛）降水减少，以及从中国东部到日本的梅雨季节异常活跃。拟议的研究代表了对TIO在气候中的作用的系统调查，并将对TIO变异和变化的机制产生新的见解。该项目的成功完成有可能提高对气候变异性和变化的理解和预测，这将使印度洋、印度洋和西北太平洋内和周边的国家/社区受益。研究生和博士后将得到培训和支持。