Dynamics of Teleconnection Patterns

太平洋/北美和北大西洋涛动等遥相关模式对气候变化起着重要作用。与专注于月和季节平均特征的研究相反，这些模式的动态特性将在两周的时间尺度上进行研究，这是其消长周期的基础。我们将研究不同的遥相关模式，以找出它们的动态是否可以统一到一个单一的连贯框架中。利用再分析资料和数值模式，利用波浪破碎假说，研究遥相关型的生命周期。这项研究还将涉及北大西洋涛动与环状模式的关系、北大西洋涛动如何影响平流层急流、以及如果北大西洋涛动是由高空的海浪破碎驱动的，什么动力过程决定了与遥相关相关的低对流层温度异常。这项研究有可能改进天气和气候预报，这将对社会活动有很大的好处。研究生将在这笔助学金下接受教育和培训。

Teleconnection patterns such as the Pacific/North American and North Atlantic Oscillation play an important role in climate variability. Contrary to the research that focused on the monthly and seasonal averaged characteristics, the dynamical properties of these patterns will be studied on the two-week time-scale which underlies their cycles of growth and decay. The various teleconnection patterns will be examined to find out if their dynamics can be unified into a single coherent framework. Using reanalysis data and a numerical model, the life cycle of teleconnection patterns will be studied using the hypothesis of wave breaking. The grant will also address the question of the relation of the North Atlantic Oscillation to the annular mode, how the North Atlantic Oscillation influences the stratospheric jet, and what dynamical processes determine the lower tropospheric temperature anomalies associated with the teleconnections if the oscillation is driven by wave breaking aloft.This research has the potential to improve weather and climate predictions, which would have great benefit for societal activities. A graduate student will be educated and trained under this grant.