Cooperative studies on dynamic interactions of tides -atmospheric tides in the lower thermosphere-

潮汐动力相互作用合作研究-低热层大气潮汐-

基本信息

批准号：
04044083
负责人：
TSUDA Toshitaka
金额：
$ 4.61万
依托单位：
Radio Atmospheric Science Center
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

In this project, the coupling process of the middle and upper atmosphere due to atmospheric tides and associated waves is studied, by means of ground based radar technique. The observations with the lidars and radiosondes are also utilized to investigate the generation and propagation process of these waves. The major part of this study is the comparison of the radar observations with the middle and upper atmosphere radar (MU radar)in Kyoto, Japan, Adelaide MF radar in Australia and Saskatoon MF radar in Canada. Those three radar are operated regularly and with good height and time resolutions.First of all we discussed the effect of the difference of radar techniques among these three radars to the results obtained by the analysis, and developed the most useful way of the analysis for the quantitative study. Next we compared the huge database obtained with these three radars, and found that the gravity wave energy is almost same magnitude between the northern and southern hemisphere but smaller in the higher latitude. This fact contradicts to the present interpretation of the tidal observations which requires a stronger gravity wave activity in the northern hemisphere to induce a large hemispheric difference of tides, and showed the necessity of further study with more observations in future.We also carried out the simultaneous observation with these three radars for several times and found a strong activity of quasi-two day waves. However, our cooperative study has shown that the energy of the planetary waves other than two-day components are much smaller. The study of lower atmospheres indicated that the possibility of the tidal generations at the low latitude regions.In summary, we have improved our understanding of tides and associated waves in the lower thermosphere and their coupling processes by using radars and other facilities among Australia, Canada and Japan, and the observations including equatorial regions are found to be very important in future.

在该项目中，利用地面雷达技术研究大气潮汐和相关波引起的中层和高层大气的耦合过程。激光雷达和无线电探空仪的观测也用于研究这些波的产生和传播过程。本研究的主要部分是将雷达观测结果与日本京都的中高层大气雷达（MU雷达）、澳大利亚阿德莱德中频雷达和加拿大萨斯卡通中频雷达进行比较。这三种雷达定期运行，具有良好的高度和时间分辨率。首先，我们讨论了这三种雷达的雷达技术差异对分析结果的影响，并提出了最有用的分析方法。定量研究。接下来我们对比这三台雷达获得的庞大数据库，发现南北半球的重力波能量几乎相同，但纬度较高的地方重力波能量较小。这一事实与目前潮汐观测的解释相矛盾，潮汐观测需要北半球更强的重力波活动才能引起较大的潮汐差异，并表明未来有必要进行进一步研究和更多观测。用这三台雷达进行多次观测，发现准两日波活动较强。然而，我们的合作研究表明，除两天成分外的行星波能量要小得多。低层大气的研究表明低纬度地区潮汐产生的可能性。综上所述，我们通过澳大利亚、加拿大等国家的雷达等设施，提高了对低热层潮汐和相关波浪及其耦合过程的认识。和日本，并且发现包括赤道地区的观测在未来非常重要。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Nakamura,T.,T.Tsuda,M.Yamamoto,S.Fukao,S.Kato,and R.A.Vincent: "Comparison of the mesospheric gravity waves observed with the MU radar(35°N)and the Adelaide MF radar(35°S)" Geophys.Res.Lett.,. 20. 803-806 (1993)

Nakamura, T., T. Tsuda, M. Yamamoto, S. Fukao, S. Kato, and R. A. Vincent：“用 MU 雷达（35°N）和阿德莱德 MF 雷达（35°）观测到的中层重力波的比较S)”地球物理学.Res.Lett.,. 20. 803-806 (1993)