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

在PI以前研究小尺度、快速大气声波-重力波工作的基础上，提出了两组相关的测量结果。在过去的一年半里，一台新的航空航天制造的红外(1.5-1.7微米波长)气辉成像仪在新墨西哥州的星火光学站点运行。现在有人提议将这台新的快速成像仪搬到毛伊岛，以利用该地点放置的激光雷达。以前的工作已经证明，夏威夷红外光谱仪的时间序列光谱中存在声波。这里的重点将是研究迄今尚未被探索的短周期(5分钟观测周期)的声波-重力波，以及极小尺度(几公里水平波长)的不稳定性。这些结果将补充其他研究人员在毛岛使用成像设备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的源区引出的，该源区可能位于距离观测地点1000公里或更远的地方。以前的数据表明，夏至前后在澳大利亚阿德莱德上空看到的海浪是从一个强对流活动的源区向北引入的，可能远至北海岸。PI建议通过独特的成像能力以及澳大利亚气候和地形的偶然性来实现波源和传播方面的工作。具体地说，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爱丽斯斯普林斯，以北约1500公里。这些将是2001年底开始运行的四个成像器链的一部分，作为2001年底达尔文波实验(DAWEX)的一部分，该链从澳大利亚北部海岸延伸到南部海岸。

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.