CEDAR: Noctilucent Clouds and Dynamics

ATM9813828研究人员将研究北极夏季现象，特别是夜光云(NLC)以及重力波和潮汐在中层大气中的传播。这项工作包括通过实施液晶双标准具系统，将格陵兰Sondrestrom的激光雷达能力扩展到白天操作。研究人员将研究以下问题：(1)NLCS行为和特征的当地时间和季节相关性是什么；(2)重力波和潮汐对NLCS的形成和寿命有什么影响；(3)NLC观测是否存在纵向差异？白天的激光雷达能力将使我们能够更深入地分析重力波对NLCS的影响，以及潮汐对云的基本特征的影响。最近的研究表明，对流层甲烷的持续增加应该会导致中层水蒸气浓度的增加，从而导致更频繁地发生近月环流，特别是在较低纬度。必须充分了解重力波对这一事件的影响，以评估人为变化的作用。

ATM9813828The investigators will study arctic summer phenomena, specifically noctilucent clouds (NLC) and gravity wave and tidal propagation through the middle atmosphere. The work involves an extension of the lidar capability at Sondrestrom, Greenland, into daytime operations by implementing a liquid crystal double etalon system.. The researchers will investigate the following questions: (1) What are the local time and seasonal dependencies of the behavior and characteristics of NLCs, (2) What is the impact of gravity waves and tides on the formation and lifetime of NLCs, and (3) Are there longitudinal differences in NLC observations? The daytime lidar capability will enable the gravity wave influences on NLCs to be more thoroughly analyzed, as well as the tidal influences on the basic characteristics of the clouds. Recent studies suggest that continued increases in tropospheric methane should result in an increase in mesospheric water vapor concentrations leading to more frequent NCL occurrence, particularly at lower latitudes. The gravity wave influences on this occurrence must be fully understood to assess the role of anthropogenic changes.