CEDAR: Noctilucent Clouds and Dynamics

CEDAR：夜光云和动态

• 批准号: 9813828
• 负责人: Timothy Kane
• 金额: $ 19.5万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9813828&HistoricalAwards=false
• 关键词: CEDAR; Noctilucent; Clouds; Dynamics

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.

ATM9813828研究人员将研究北极夏季现象，特别是平流层云（NLC）和重力波以及潮汐通过中层大气的传播。 这项工作涉及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。 研究人员将调查以下问题：（1）NLC的行为和特征的当地时间和季节依赖性是什么？（2）重力波和潮汐对NLC的形成和寿命有什么影响？（3）NLC观测是否存在纵向差异？ 白天激光雷达的能力将使重力波对NLC的影响能够得到更彻底的分析，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导致中间层水汽浓度的增加，从而导致更频繁的NCL发生，特别是在低纬度地区。 必须充分了解重力波对这种情况的影响，以评估人为变化的作用。