Multi-Scale Dynamics Studies Using the Drake Antarctic Agile Meteor Radar

使用德雷克南极敏捷流星雷达进行多尺度动力学研究

• 批准号: 1744801
• 负责人: David Fritts
• 金额: $ 18万
• 依托单位: GLOBAL ATMOSPHERIC TECHNOLOGIES AND SCIENCES, INC.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-10-01 至 2022-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1744801&HistoricalAwards=false
• 关键词: Multi; Scale; Dynamics; Studies; Using

The Earth's layered atmosphere extends from the surface to the altitudes of about 100 km, consisting of the most lower layer - troposphere, and then extending up through the mesosphere and lower thermosphere, which includes a layer of strongly ionizes air called ionosphere (MLTI). Due to atmospheric perturbations caused by the underlying Earth's landscape of ocean, land, and mountains, the gravity (or internal) waves (GW) are generated with quasi-periodic oscillations most familiar as the wave-like cloud patterns. This project seeks to experimentally investigate the role of atmospheric gravity waves while they propagate up and at distance through the mesosphere to thermosphere, and affect in some way the ionosphere. A well-known major 'hotspot' of gravity waves activity exists over the South America?s Andes, Antarctic Peninsula, and Drake Passage located between these landmasses and connecting the Pacific and Atlantic Oceans. This hotspot is fed by major GW sources in this region that include high mountains, strong jet streams, and the passage of vigorous frontal weather systems. The award will reinstate the Drake Antarctic Agile MEteor Radar (DrAAMER) that was deployed at the Brazilian Antarctic Station Comandante Ferraz in 2010. Upon reinstatement, the radar will be employed in diverse observations along with another meteor radar, SAAMER, deployed in Southern Argentina. These observations will be used for studies of the coupling and dynamics of atmospheric waves generated at lower altitudes over the Drake Passage and then propagating into the mesosphere, lower thermosphere, and ionosphere regions. This research addresses topics that are of high interest and relevance to diverse scientific communities, especially for defining more accurate parameterizations of the MLTI dynamics for the weather prediction and climate modeling.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

地球的层状大气从地表延伸到约100公里的高度，由最下层——对流层组成，然后向上延伸穿过中间层和较低的热层，其中包括一层被称为电离层（MLTI）的强电离空气。由于地球底层的海洋、陆地和山脉景观引起的大气扰动，重力（或内）波（GW）是通过准周期振荡产生的，最常见的是波状云模式。该项目旨在通过实验研究大气重力波在穿过中间层远距离传播到热层时的作用，并以某种方式影响电离层。众所周知的重力波活动主要“热点”存在于南美洲的安第斯山脉、南极半岛以及位于这些陆地之间并连接太平洋和大西洋的德雷克海峡。该热点由该地区主要的引力波源提供能量，包括高山、强烈的急流和剧烈的锋面天气系统的通过。该合同将恢复 2010 年部署在巴西 Comandante Ferraz 南极站的德雷克南极敏捷流星雷达 (DrAAMER)。恢复后，该雷达将与部署在阿根廷南部的另一台流星雷达 SAAMER 一起用于各种观测。这些观测结果将用于研究德雷克海峡上空较低高度产生的大气波的耦合和动力学，然后传播到中间层、较低的热层和电离层区域。这项研究涉及不同科学界高度关注和相关的主题，特别是为天气预报和气候建模定义更准确的 MLTI 动力学参数化。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。

项目成果

Climatology of quasi-2-day wave structure and variability at middle latitudes in the northern and southern hemispheres

北半球和南半球中纬度准2日波结构和变率的气候学

• DOI: 10.1016/j.jastp.2021.105690
• 发表时间: 2021-09
• 期刊: Journal of Atmospheric and Solar-Terrestrial Physics
• 影响因子: 1.9
• 作者: Iimura, Hiroyuki;Fritts, David C.;Lieberman, Ruth S.;Janches, Diego;Mitchell, Nicholas J.;Franke, Steven J.;Singer, Werner;Hocking, Wayne K.;Taylor, Michael J.;Moffat
• 通讯作者: Moffat