Collaborative Research: A Diagnostic and Modeling Study of Stratosphere-Troposphere Coupling in the Arctic Oscillation

美国伊利诺斯州大学格鲁吉亚理工学院的合作研究将检查对流层和平流层之间的耦合。直到最近，动力耦合一直被认为是单向的对流层行星波向上传播，并引起平流层动力场的变化。最近的证据表明，平流层极涡的变化也可以直接引起对流层显著的环流异常。本研究计划通过将位涡和诊断模式方法应用于观测分析和机制数值模拟试验，研究季节内AO事件期间平流层和对流层之间的耦合。这项工作很重要，因为它将增加我们对北极涛动引起的高纬度气候变化的认识和理解

ABSTRACTATM-0001325 & ATM-0001346Robinson, Walter & Black, RobertUniversity of Illinois & Georgia Institute of TechnologyThe collaborative research will examine coupling between the troposphere and stratosphere. Until recently, the dynamical coupling has been regarded as uni-directional with tropospheric planetary waves propagating upwards, and inducing changes in stratospheric dynamical fields. Recent evidence indicates variations in the stratospheric polar vortex can also directly induce significant circulation anomalies in the troposphere. The PIs propose to study the coupling between stratosphere and troposphere during intraseasonal AO events, by applying potential vorticity (PV) and diagnostic modeling approaches, to both observational analyses and mechanistic numerical modeling experiment. The work is important because it will increase our knowledge and understanding of high latitude climate variability due to the Arctic Oscillation