Collaborative Research: Lidar Investigation of Middle and Upper Atmosphere Temperature, Composition, Chemistry, and Dynamics at McMurdo, Antarctica

合作研究：南极洲麦克默多的中高层大气温度、成分、化学和动力学激光雷达研究

• 批准号: 1246431
• 负责人: Chester Gardner
• 金额: $ 24.72万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1246431&HistoricalAwards=false
• 关键词: Collaborative; Research; Lidar; Investigation; Middle

The new observations of iron layers, neutral temperatures, and gravity waves up to 155-km altitudes with the Fe-Boltzmann lidar (deployed at McMurdo in 2010) have opened a new door to explore the Antarctic neutral thermosphere. These measurements of neutral-ion coupling and Joule heating, in the critical region above 100 km, are an objective of highest priority for the upper atmosphere science community. Development of the neutral atmosphere temperature climatology is crucial for calibrating satellite observations of the polar mesosphere-lower thermosphere (MLT) region and validating global climate models; in decades from now this climatology records will serve as the baseline against which long-term temperature trends in the changing Antarctic climate are assessed. The studies of extreme summertime Fe events and solar effects on Fe-layer's bottom side are improving the understanding of iron chemistry at polar latitudes. The vertical heat and constituent flux observations with the lidars are enhancing the knowledge of wave-induced transport in the polar mesopause region and remove the greatest source of uncertainty in current chemical-dynamical models of the mesospheric metal layers. This also led to improvements in quantitative estimates of the cosmic dust input that has implications for a variety of geophysical processes throughout the Antarctic atmosphere and Southern Ocean. The characterization and analysis of the gravity wave field in the neutral atmosphere above McMurdo are advancing the understanding of wave coupling in the MLT region and provide better constraints on wave parameterization schemes in climate models. Thus, the McMurdo lidar campaigns provide a new look into the composition, chemistry, temperature, and dynamics of the polar upper atmosphere in a critical latitudinal gap region mid-way between the South Pole and Antarctic Circle. The Fe-Boltzmann lidar has already produced a rich dataset stored in the CEDAR/Madrigal database, which is readily available to other scientists to help supporting their own research on polar aeronomy and climate. This project provides exceptional opportunities to train students and young researchers by giving them fieldwork experience in Antarctica. The project also enhances classroom teaching and graduate programs at several prominent universities around the world.

使用铁玻尔兹曼激光雷达（2010 年部署在麦克默多）对铁层、中性温度和高达 155 公里高度的重力波进行的新观测，为探索南极中性热层打开了一扇新的大门。这些在 100 公里以上关键区域的中性离子耦合和焦耳热测量是高层大气科学界的首要目标。中性大气温度气候学的发展对于校准极地中层-低热层（MLT）区域的卫星观测和验证全球气候模型至关重要；几十年后，这些气候学记录将作为评估南极气候变化的长期温度趋势的基线。对夏季极端铁事件和太阳对铁层底部影响的研究正在增进对极地纬度铁化学的理解。利用激光雷达进行的垂直热量和成分通量观测正在增强对极地中层顶区域波诱导输运的了解，并消除当前中层金属层化学动力学模型中最大的不确定性来源。这也导致了对宇宙尘埃输入的定量估计的改进，这对整个南极大气和南大洋的各种地球物理过程都有影响。麦克默多上方中性大气中重力波场的表征和分析正在推进对MLT区域波耦合的理解，并为气候模型中的波参数化方案提供更好的约束。因此，麦克默多激光雷达活动为南极和南极圈之间关键纬度间隙区域的极地高层大气的成分、化学、温度和动力学提供了新的视角。 Fe-Boltzmann 激光雷达已经生成了存储在 CEDAR/Madrigal 数据库中的丰富数据集，其他科学家可以随时使用这些数据集来帮助支持他们自己的极地航空和气候研究。该项目通过为学生和年轻研究人员提供南极洲实地考察经验，为培训他们提供了绝佳的机会。该项目还加强了世界各地几所著名大学的课堂教学和研究生课程。