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Understanding tidally and atmospherically forced resonances in an Ocean Circulation Model in terms of free oscillations

从自由振荡的角度理解海洋环流模型中的潮汐和大气强迫共振

基本信息

批准号：
101169086
负责人：
Professor Dr. Malte Müller
金额：
--
依托单位：
School of Earth and Ocean Sciences
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/101169086?language=en
关键词：
Understanding tidally atmospherically forced resonances

项目摘要

In recent years analyses of observational and model data supported the hypothesis that ocean tides play an essential role in the description of vertical mixing processes of water masses. Thus, ocean tides have a considerable influence on the ocean circulation. In particular, tides generate internal waves, which through breaking mechanism enhance vertical mixing in the ocean. This process occurs predominantly at continental shelf transition zones and at topographic structures in the open ocean, like mid ocean ridges. However, in ocean models vertical mixing is treated in a very simplified form, mostly horizontally uniform and without tidal effects. For reliable climate predictions, the appropriate physical description of the tidal mixing processes is indispensable. In a unique approach the complete lunisolar tidal potential is implemented in a climate model. In the present project, this approach will be extended through an implementation of the internal tide effect on vertical mixing processes in the ocean. Hence it will be possible to investigate the role of ocean tides in climate models. Furthermore, with a novel method to describe periodic motions in terms of free oscillations and with the results of the above mentioned ocean model, the oscillation behavior of the global ocean will be analyzed on different time scales. Thus, it is possible to analyze long periodic atmospheric forced oscillations and high frequency overtides. Results from other model approaches and from satellite observations will be included in this study.

近年来对观测资料和模式资料的分析支持这样的假设，即海潮在描述水团的垂直混合过程中起着重要作用。因此，海潮对海洋环流有相当大的影响。特别是潮汐产生内波，通过破碎机制增强海洋的垂直混合。这一过程主要发生在大陆架过渡带和公海的地形结构上，如洋中脊。然而，在海洋模式中，垂直混合以一种非常简化的形式处理，基本上是水平均匀的，没有潮汐效应。对于可靠的气候预测，潮汐混合过程的适当的物理描述是必不可少的。以一种独特的方法，在气候模式中实现了完整的日月潮汐势。在本项目中，将通过实施海洋垂直混合过程中的内部潮汐效应来扩展这种方法。因此，研究海潮在气候模式中的作用将成为可能。在此基础上，提出了一种用自由振荡来描述周期运动的新方法，并结合上述海洋模式的结果，分析了全球海洋在不同时间尺度上的振荡行为。因此，有可能分析长周期的大气强迫振荡和高频溢出。其他模型方法和卫星观测的结果将包括在本研究中。