Collaborative Research: An investigation of wave dynamics in the Arctic mesosphere and coupling between the lower and upper polar atmosphere

研究目标是利用一套仪器，包括气辉成像仪，在阿拉斯加上空的北极大气中调查短周期重力波。短周期重力波是较大大气环流的重要组成部分，因为这些波被认为将大量垂直矩通量输送到中间层和较低的热层(MLT)区域。虽然这些波的传播性质和来源在中低纬度地区得到了广泛的研究，但对它们在高纬度地区的行为却知之甚少。最近的努力已经开始描述南极大陆上的海浪，而这里提出的项目将把重点放在北极。具体地说，拟议的研究将建立北极短周期重力波的长期冬季时间序列，包括它们的主要源区，以及大尺度潮汐和行星波运动的影响。位于同一地点的瑞利激光雷达将提供必要的高垂直分辨率温度测量，以帮助阐明垂直波的传播，单个波对Eliassen-Palm(EP)通量的贡献，以及平流层变暖事件期间低层和高层大气之间的耦合。

The research objective is to utilize a suite of instruments, includingan airglow imager, to investigate short-periodgravity waves in the Arctic atmosphere over Alaska. Short-periodgravity waves are an important component of the larger atmosphericcirculation as these waves are believed to transport a large amount ofvertical moment flux into the mesosphere and lower thermosphere (MLT)region. While the propagation nature and sources of these waves havebeen studied extensively at low- and mid-latitudes, little is known about their behavior at high latitudes. Recent efforts havebegun to characterize the waves over the Antarctic continent, whilethe project proposed here will focus on the Arctic. Specifically, theproposed research will establish a long-term winter time series ofshort-period gravity waves in the Arctic, including their dominantsource regions, and influences of large-scale tidal and planetary wavemotion. The co-located Rayleigh lidar will provide essential highvertical resolution temperature measurements to help elucidate thevertical wave propagation, individual wave contribution to theEliassen-Palm (EP) flux, and coupling between the lower and upperatmosphere during stratospheric warming events.