Acquisition and Analysis of Gravity Wave Image Data for Investigating Antarctic Mesospheric Dynamics

这一建议将用于数据采集和深入的数据分析，利用南极两个关键站点的现有和新的测量结果来调查高纬度地区短周期（1小时）中间层重力波的气候学，并研究它们的传播和最丰富的来源。拟议中的项目是由美国国家科学基金会极地项目办公室和英国南极调查局联合资助的一项试点研究的后续，该研究旨在调查从南极洲发出的重力波成像的潜力。1999年12月，美国犹他州立大学研制了一台全天候多波长CCD成像仪，部署在南极哈雷站（76s）， 2000年3月开始自动测量。USU/BAS成像仪在过去的三个南方冬季（4月至9月）非常成功地运行，提供了南极大陆上小尺度重力波形态和动力学的第一个长期（约5个月/季节）图像测量。2002年，摄像机被搬迁到南极半岛的罗瑟拉站（67 S），准备使用一套专门的仪器进行新的协调测量，包括铁温度激光雷达、波米姆OH干涉仪和中频雷达，用于同时测量风。在这两个地点的测量提供了高纬度重力波活动和来源的不同样本，使研究地形强迫和长距离导管波传播成为可能。哈雷站位于广阔的布伦特冰架上，与中纬度地区普遍存在的局部对流源隔绝，距离南极山脉数千公里，与罗瑟拉站形成鲜明对比。罗瑟拉站位于一个潜在的“刀刃”波发生器上，由强烈的冬季极地涡旋风吹过海拔2公里的近乎垂直的半岛悬崖造成。作为我们与BAS正在进行的合作计划的一部分，全天相机的操作和维护由BAS负责。在此提案中，要求支持继续支持研究生进行数据分析的令人兴奋的协作测量。

This proposal is for data acquisition and in-depth data analysis that will utilize existing and new measurements from two key sites in Antarctica to investigate the climatology of short-period (1 hour) mesospheric gravity waves at high-latitudes and to study their propagation and most copious sources. The proposed program is a follow on to a pilot research, jointly funded by the NSF Office of Polar Programs and the U.K. British Antarctic Survey, to investigate the potential of imaging gravity waves from Antarctica. An all-sky multi-wavelength CCD imager was developed at Utah State University and deployed at Halley Station, Antarctica (76 S) in December 1999 and automatic measurements were initiated in March 2000. The USU/BAS imager has operated very successfully for the past three Austral winters (April-September) providing the first long-term (~5 month/season) image measurement of small-scale gravity wave morphology and dynamics over the Antarctic continent. In 2002, the camera was relocated to Rothera Station (67 S) on the Antarctic Peninsula in preparation for new coordinated measurements using a suite of specialized instrumentation including an Fe temperature lidar, a Bomem OH Interferometer and an MF radar for simultaneous wind measurements. Measurements at these two sites provide a diverse sample of high-latitude gravity wave activity and sources, enabling the investigation of orographic forcing and long-distance ducted wave propagation. The isolated location of Halley on the vast Brunt Ice Shelf greatly removed from localized convective sources that prevail at mid-latitudes and several thousand kilometers from the Antarctic Mountain Range contrasts markedly with Rothera Station which is located on a potential "knife edge" wave generator caused by strong winter polar vortex winds blowing over the near-vertical peninsula cliffs rising as high as 2 km above sea level. As part of our ongoing collaborative program with BAS the operation and maintenance of the all-sky camera is covered by BAS. In this proposal support is requested to continue this exciting collaborative measurements supporting a graduate student for the data analysis.