Impact of Atmospheric 30-60 Day and Quasi-biweekly Oscillation on Tropical Indian Ocean Dynamics, Heat Transport, and Upper Ocean Heat Content

大气 30-60 天和准双周振荡对热带印度洋动力学、热传输和上层海洋热含量的影响

• 批准号: 0452917
• 负责人: Weiqing Han
• 金额: --
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-03-01 至 2010-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0452917&HistoricalAwards=false
• 关键词: Impact; Atmospheric; 30; 60; Day

0452917The climatic importance of atmospheric IntraSeasonal Oscillations (ISOs) in the tropical Indian Ocean has been receiving increasing attention. Reflecting this importance, extensive modeling studies, together with a few newly deployed mooring observations, have significantly advanced our understanding of various aspects of Indian Ocean variability induced by atmospheric ISOs in the past a few years. This understanding, however, is far from complete and many outstanding science issues remain unaddressed.The objectives of the proposed project are to explore: (i) How and why do the surface and subsurface meridional currents in the equatorial Indian Ocean respond to atmospheric ISOs (especially the dominant 30-60 day and quasi-biweekly oscillations), and how does that response impact multi-timescale variability of cross-equatorial heat transport? (ii) What are the seasonality and interannual variability of the upper Indian Ocean response to atmospheric ISOs? (iii) How do atmospheric ISOs affect the variability of tropical Indian Ocean (especially the warm pool) heat content?The primary tool for this project is an ocean general circulation model. Satellite data combined with daily reanalysis from the European Center for Medium range Weather Forecasts will be used as the model forcing fields. The realistic representation of physics in the ocean model allows for a direct investigation of how the ocean responds to the intraseasonal atmospheric forcing. To provide insights into the key oceanic processes involved, a linear continuously stratified model and a nonlinear intermediate ocean model will also be used. Available data in the Indian Ocean will be analyzed, compared with, and interpreted by the model solutions. The proposed research is scientifically important because interannual variability of the tropical Indian Ocean (the part that is independent of ENSO) is not well understood, and the cross-timescale impact of atmospheric ISOs has been suggested. The project addresses a central theme of climate research and is essential for understanding the role of atmospheric ISOs in causing multi-scale climate variability in the tropics. The intellectual merit of the proposed project lies in its contribution to advancing our understanding of, and providing new insight into, how and why the tropical Indian Ocean responds to intraseasonal atmospheric forcing, a study that will build a solid foundation for identifying the role played by atmospheric ISOs in causing climate variability in the tropical coupled ocean/atmosphere system. By integrating the research with education, the project will have a broader impact on our society through both advancing climate research and promoting graduate education.

0452917在热带印度洋中，气候季节内振荡（ISO）的重要性一直在受到越来越多的关注。反映了这种重要性，广泛的建模研究，以及一些新部署的系泊观测，这显着提高了我们对过去几年中大气ISO引起的印度洋变异性各个方面的理解。然而，这种理解远非完整，许多杰出的科学问题仍然没有解决。拟议项目的目标是探索：（i）赤道印度洋中的地面和地面子午电流如何以及为什么响应大气ISO响应大气ISO（尤其是主导的30-60天和Quasi-bi-bi-bi-bi-bi-biy-biy-bi的振动），以及该响应的变化如何？ （ii）印度洋上部对大气ISO的反应的季节性和年际变化是什么？ （iii）大气ISO如何影响热带印度洋（尤其是温暖池）热含量的变异性？该项目的主要工具是海洋一般循环模型。卫星数据与欧洲中等范围天气预报中心的每日重新分析相结合，将用作模型强迫场。物理在海洋模型中的现实表示可以直接研究海洋如何应对季节内大气强迫的反应。为了洞悉所涉及的关键海洋过程，还将使用线性连续分层的模型和非线性中间海洋模型。与模型解决方案相比，将分析印度洋的可用数据。拟议的研究在科学上很重要，因为热带印度洋（独立于ENSO的部分）的年际变化尚不清楚，并且已经提出了大气ISO的跨时间影响。该项目介绍了气候研究的中心主题，对于理解大气ISO在引起多尺度气候变异性中的作用至关重要。拟议项目的智力优点在于它在促进我们对我们的理解并提供了新的见解，并为热带印度洋提供了新的见解，以及为什么对季节内大气强迫做出反应，这项研究将为识别大气ISO在导致气候变化造成气候变异性的稳固基础。通过将研究与教育相结合，该项目将通过推进气候研究和促进研究生教育对我们的社会产生更大的影响。