Low-Frequency Zonally-Averaged Flow Variability Studied with Models and Observations

题目：基于模式和观测的低频纬向平均流量变异研究。本研究的主要目的是探讨纬向平均流量对大气低频变异的作用。为了实现这一目标，正在采用一种综合方法，审查实际观测、理想化的简单模式和现实的复杂全球模式的输出。这种方法可以增强我们对大气低频变率的基本动力学的理解。将研究与高低纬向指数阶段的维持、开始和衰减有关的动力机制的细节。研究了区域遥连接模式和阻塞及其与地带性指数的关系。本文还将探讨海温在纬向指数年际变化中的作用。大气的低频振荡与中、大范围预报密切相关。这项研究具有改进预测模型和预测的潜力。

Abstract ATM-9416701 Feldstein, Steven Pennsylvania State University Title: Low-Frequency Zonally-Averaged Flow Variability Studied with Models and Observations The primary objective of the proposed research is to investigate the role of the zonally averaged flow on atmospheric low frequency variability. A combined approach of examining the real observations, the outputs of idealized simple models and realistic complex global models is being adopted to achieve this goal. This approach can enhance our understanding of the fundamental dynamics of low frequency variability of the atmosphere. Details of dynamical mechanisms associated with the maintenance, onset and decay of both high and low zonal index phases will be examined. Regional teleconnection patterns and blocking and their relationship with zonal index will be studied. The role of SST in the interannual variability of the zonal index will also be investigated. Low frequency oscillations of the atmosphere are intimately related to medium and extended range forecasting. This research has potential for improving forecast models and in turn forecasts.