Coupled Modeling of Annual and Interannual Tropical Ocean-Atmosphere Interaction

项目摘要 提案ID： ATM-9312888 主要负责人：金飞飞机构：夏威夷大学TOGA，CDP 标题：年度和年际热带海洋-大气相互作用的耦合模拟 对热带海洋-大气相互作用的研究主要集中在与厄尔尼诺-南方涛动现象有关的年际变化方面。 不同复杂性的耦合模型已经被开发出来来理解、模拟和预测这种现象。 然而，越来越多的观测和模拟研究表明，年周期和年际变率是内在相关的。 该项目将使用一系列在热带耦合模式中被证明是有用和经济的中间和混合耦合模式来研究年度和年际变率，重点是年度循环在热带海洋-大气年际相互作用中所起的作用。 这项研究的目标是提高对热带海洋-大气系统中观测到的年度和年际变化的认识。 中间耦合模型，基于1987年Zebiak Cane模型的简化版本，已经由Jin Neelin开发和广泛分析。 该模式结合了海洋表面温度和海洋动力学的非对称分量，对气候年周期进行了逼真的模拟，并将用于调查年周期对年际变化的作用。 将研究引起耦合年振荡和次谐波振荡的频率锁定机制。 将在广泛的参数空间范围内探讨耦合的年度、准两年期和低频模态的制度。 中间耦合模式的物理参数化将得到改进，并可用于进一步研究年循环的耦合动力学和年际耦合模态。 在中间耦合模式研究的基础上，本文将进一步推广到海洋环流模式和准定常热带大气模式的混合耦合模式系统的研究。 混合耦合模式系统允许一个更复杂的检查年度和年际节点之间的相互作用和探索的制度，支持准两年期和低频率的变化与制度诊断工具的基础上的中间模型。

PROJECT SUMMARY PROPOSAL ID: ATM-9312888 PRINCIPAL INVESTIGATOR: Jin, Fei-fei INSTITUTION: University of Hawaii PROGRAM: TOGA, CDP TITLE: Coupled Modeling of Annual and Interannual Tropical Ocean- Atmosphere Interaction Investigations of the tropical ocean-atmosphere interaction have focused largely on aspects of the interannual variability related to the El Nino-Southern Oscillation (ENSO) phenomenon. Coupled models of differing complexity have been developed to understand, simulate, and predict this phenomenon. However, there are increasing indications from both observational and modeling studies that the annual cycle and interannual variability are intrinsically related. This project will use a series of intermediate and hybrid coupled models, proven to be useful and economical in tropical coupled modeling, to investigate annual and interannual variability with an emphasis on the role played by the annual cycle in the interannual tropical ocean-atmosphere interaction. The goal of this research is improved understanding of the annual and interannual variabilities observed in the tropical ocean-atmosphere system. The intermediate coupled model, based on a simplified version of the 1987 Zebiak & Cane model, has been developed and extensively analyzed by Jin & Neelin. This model incorporates asymmetric components of sea surface temperature and ocean dynamics to give a realistic simulation of the climatological annual cycle and will be used to investigate the role of the annual cycle on the interannual variability. The mechanisms of frequency locking that give rise to coupled annual and sub-harmonic oscillations will be investigated. The regimes of coupled annual, quasi-biennial and low-frequency modes will be explored in an extensive range of parameter space. The intermediate coupled model will be improved with better parameterization of the physics and used fo r further studies of the coupled dynamics of the annual cycle and the interannual coupled modes. This investigation will be extended, based on the results from the research with the intermediate coupled model, to studies with a hybrid coupled model system which includes an ocean general circulation model and a quasi-steady tropical atmosphere model. The hybrid coupled model system permits a more sophisticated examination of the interaction between annual and interannual nodes and an exploration of the regime which supports the quasi-biennial and low-frequency variability with a regime diagnostic tool based on the intermediate model.