The Dynamics of Low-Frequency Phenomena

摘要ATM-9526030韦伯斯特，彼得J.科罗拉多大学标题：低频现象的动力学 PI将调查并描述：o 季风的形态及其与其他气候的关系 循环系统。 该项目是一个重大的新 在低频现象研究中的主动性。 O 波通过非常复杂的背景流的传播 热带地区 PI计划扩展早期的工作， 研究垂直切变对赤道波的影响 传播，最后考虑所有剪切和拉伸 变形同时进行。 O 从耦合的角度看季节内变率 海洋-大气动力系统 PI指出， 对流在热带的位置及其组织 季节内的时间尺度在很大程度上仍然无法解释。 他 计划从根本上调查这个组织 相对于海洋-大气耦合系统的观点。 季风和与东西海面温度梯度相关的环流产生了一个缓慢演变的系统，其中存在着气候系统年际变率的很大一部分。 对流团的缓慢迁移可能是低频季风-ENSO系统的产物。 初步估计，赤道瞬变波积累能量的区域或影响高纬度的区域取决于季风-ENSO系统的缓慢演变状态。 PI提出了一个方案，其中低频季风-ENSO系统的定义范围内的海洋-大气-陆地耦合。 这项研究很重要，因为它寻求有关控制气候季节到年际变化的因素的知识。 为了改善这些时间尺度上气候变化的预测，需要这些知识。

Abstract ATM-9526030 Webster, Peter J. University of Colorado Title: The Dynamics of Low-Frequency Phenomena The PI will investigate and describe: o The morphology of the monsoon and its relationship with other circulation systems. This project represents a major new initiative in the study of low frequency phenomena. o Wave propagation through the very complex background flow of tropics. The PI plans to extend earlier work and to investigate the impact of vertical shear on equatorial wave propagation and, finally consider all shears and stretching deformations concurrently. o Intraseasonal variability from the perspective of coupled ocean-atmosphere dynamic systems. The PI notes that the location of convection in the tropics and its organization on the intraseasonal time scales remains largely unexplained. He plans to investigate this organization from a fundamental perspective relative to the coupled ocean-atmosphere system. The monsoons and the circulation associated with the east-west sea- surface temperature (SST) gradients produce a slowly evolving system within which resides a large proportion of the interannual variability of the climate system. The slow migrations of convection clusters which make up the intraseasonal variability in the tropics may be products of the low frequency monsoon-ENSO system. To a first approximation, the regions where equatorial transient waves accumulate their energy or where they influence higher latitudes is determined by the slowly evolving state of the monsoon-ENSO system. The PI proposes a program in which the low frequency monsoon-ENSO systems is defined within the context of ocean-atmosphere-land coupling. This research is important because it seeks knowledge about the factors that control the seasonal-to-interannual variability of the climate. Such knowledge is required in order to improve the prediction of climate variability on these time s cales.