CEDAR: Studies of Trapped, High Frequency Acoustic-Gravity Waves near the Mesopause

CEDAR：中层顶附近被捕获的高频声重力波的研究

• 批准号: 0122772
• 负责人: James Hecht
• 金额: $ 22.5万
• 依托单位: Aerospace Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0122772&HistoricalAwards=false
• 关键词: CEDAR; Studies; Trapped; Frequency; Acoustic

Two sets of related measurements are proposed that build upon the PI's previous work in studying small-scale, fast atmospheric acoustic-gravity waves. During the past year and a half, a new Aerospace built infrared (1.5 - 1.7 um wavelength) airglow imager has operated at the Starfire Optical Site in New Mexico. It is now proposed to move this new fast imager to Maui to take advantage of the placement of the lidar at that site. Previous work has shown the existence of acoustic waves in time series spectra from a Hawaii based IR spectrograph. The emphasis here will be on studying the as yet poorly explored short period ( 5 minute observed period) acoustic-gravity waves, and the very small scale (a few km horizontal wavelength) instabilities. These results will complement the studies of the longer period gravity waves undertaken by other investigators using their imaging instruments at Maui.Further, there is strong experimental evidence that small-scale waves seen in airglow images are ducted from a source region in the troposphere that could be located a thousand kilometers or more from the observation site. Previous data suggest that the waves seen over Adelaide, Australia around summer solstice are ducted from a source region of strong convective activity well to the north perhaps as far away as the north coast. The PIs propose work in wave sources and propagation enabled by a unique capability for imaging and by the fortuitous nature of the climate and topography of Australia. Specifically, they propose to obtain data from two airglow imagers; one located at Adelaide and another at Alice Springs, Australia about 1500 km to the north. These will be part of a four imager chain, to begin operating in late 2001, that extends from the northern to the southern coast of Australia as part of the Darwin Wave Experiment (DAWEX) in late 2001.

两套相关的测量建议建立在PI以前的工作，在研究小尺度，快速大气声重力波。 在过去的一年半里，一个新的航空航天制造的红外（1.5 - 1.7微米波长）气辉成像仪已在新墨西哥州的星火光学网站。 现在建议将这种新的快速成像仪移到毛伊岛，以利用激光雷达在该地点的位置。 以前的工作表明，存在的声波的时间序列光谱从夏威夷的红外光谱仪。 这里的重点将是研究尚未充分探索的短周期（5分钟的观察周期）声重力波，和非常小的规模（几公里的水平波长）的不稳定性。 这些结果将补充其他研究人员使用他们在毛伊岛的成像仪器进行的较长周期重力波的研究。此外，有强有力的实验证据表明，在气辉图像中看到的小尺度波是从对流层中的源区域输送而来的，该源区域可能位于距观测地点1000公里或更远的地方。 以前的数据表明，在澳大利亚阿德莱德上空看到的夏至前后的波浪是从一个强对流活动的源区向北输送的，可能远至北海岸。 PI建议在波源和传播方面开展工作，这是由独特的成像能力和澳大利亚气候和地形的偶然性所实现的。 具体来说，他们建议从两个气辉成像仪获取数据;一个位于阿德莱德，另一个位于澳大利亚北部约1500公里的爱丽丝泉。 这些将是2001年底开始运行的四个成像器链的一部分，该成像器链从澳大利亚的北方延伸到南部海岸，作为2001年底达尔文波浪实验的一部分。