The Geophysical Fluid Dynamics of the Coupled Atmosphere- Ocean System

摘要ATM-9710285 Vallis，Geoffrey K. 加州大学，圣克鲁斯大气-海洋耦合系统的地球物理流体动力学 PI将使用新颖但动力学适当的模型研究大气-海洋耦合系统的地球物理流体动力学。 这项工作将集中于中纬度动力学，主要是十年或更长时间尺度的现象。 该项目的目标是分离和理解在这些时间尺度上产生可变性和限制可预测性的具体和强大的机制。 PI将采取的方法与使用GCM的更传统的方法不同，但相互补充。 PI使用原始运动方程的有理近似来推导适合于感兴趣的时间和空间尺度的大气和海洋模型。 然后，这些耦合和集成数字。 通过将模型建立在对基本动力学的合理近似的基础上，这些模型是真实的大气和海洋中发生的基本机制的可靠指标。 最后，但并非最不重要的是，模型将提供一个工具，更复杂的GCM实验的解释。 提案文本中描述了有待探索的具体机制和有待检验的假设，主要目标是了解这些过程的基本动态和可预测性，从而了解大气或海洋单独或通过耦合相互作用产生的长期变化程度。 尽管对耦合大气环流模型进行了大量研究，但对导致长期变化的耦合相互作用的动力学了解甚少，而且这种变化的幅度和重要性也不清楚。 此外，尽管年代际至世纪时间尺度上的气候变率具有明显的重要性，但它的研究和理解可能不如年际或千年时间尺度上的变率机制。

Abstract ATM-9710285 Vallis, Geoffrey K. University of California, Santa Cruz The Geophysical Fluid Dynamics of the Coupled Atmosphere-Ocean System The PI will investigate the geophysical fluid dynamics of the coupled atmosphere-ocean system with novel but dynamically appropriate models. The effort will concentrate on mid-latitude dynamics, and primarily on phenomena with timescales of a decade and longer. The goal of the project is to isolate and understand specific and robust mechanisms which produce variability and limit predictability on these timescales. The approach the PI will take is different from, but complementary to, more conventional approaches using GCMs. The PI uses rational approximations of the primitive equations of motion to derive models appropriate for the time and space scales of interest, for both atmosphere and ocean. These are then coupled and integrated numerically. By basing the models on rational approximations to the underlying dynamics, the models are reliable indicators of the underlying mechanisms occurring in the real atmosphere and ocean. Last, but by no means least, the models will provide a tool for the interpretation of more complex GCM experiments. Specific mechanisms to be explored and hypotheses to be tested are described in the text of the proposal, with the primary goal of understanding the basic dynamics and predictability of these processes, and thereby the extent to which long-term variability can be produced by either atmosphere or ocean alone, or by coupled interactions. In spite of much study with coupled GCMs, the dynamics of coupled interactions leading to variability on long timescales are poorly understood, and the magnitude and thus importance of such variability is not known. Further, climate variability on the decadal to century time scale is perhaps less well studied and understood than the mechanisms of variability on either interannual or millennium timescales, in spite of its manifest importance.