Collaborative observations of equatorial atmosphere dynamics

赤道大气动力学协同观测

• 批准号: 09044080
• 负责人: TSUDA Toshitaka
• 金额: $ 10.3万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09044080/
• 关键词: Equatrial Atmosphere; Middle Atmosphere; Atmospheric Radar; Global Circulation; Meteor Wind Radar; Atmospheric Waves; Indonesia; Earth Atmospheric Environment; 地球大気環境

The main purpose of this study is to reveal the characteristics of middle atmosphere dynamics over equatorial region, especially over Indonesia. We continued long-period observations around mesopause region using Meteor Wind Radar at Jakarta and MF Radar at Pontianak. We also con-ducted an intensive radiosonde sounding campaign at Pontianak to analyze behavior of atmospheric waves near the source region. The variances of wind velocity fluctuations with short periods and small vertical scales showed clear seasonal variations, and they seemed to be correlated with background conditions such as water vapor content and mean zonal wind velocity. Those data obtained in Indonesia were included in the database of equatorial atmosphere radar network, and compared with data obtained from other radars, satellite, and results of numerical models.Precise spatial structure of diurnal and semidiurnal tides in lower latitude and longitudinal dependence of Mesospheric Semi Annual Oscillation(MSAO) were clearly described. Additionally, new methods of estimation for momentum flux using radiosonde data are under development. We also constructed a direct data transfer route via Internet from Indonesia to Japan and Australia.

本研究的主要目的是揭示赤道地区，特别是印度尼西亚上空中层大气动力学的特征。我们继续使用雅加达的流星风雷达和坤甸的MF雷达对中层顶区域进行长期观测。我们还在坤甸进行了一次密集的无线电探空活动，以分析震源区附近的大气波动行为。短周期、小垂直尺度的风速脉动方差具有明显的季节变化，且与水汽含量、纬向平均风速等背景条件有关。将这些资料输入赤道大气雷达网数据库，并与其它雷达、卫星资料和数值模式的结果进行比较，清晰地描述了低纬地区潮汐日、半日的空间结构和中层大气半年振荡（MSAO）的经向依赖性。此外，正在开发利用无线电探空仪数据估算动量通量的新方法。我们还通过互联网建立了从印度尼西亚到日本和澳大利亚的直接数据传输路线。

项目成果

T.Nakamura: "Short period fluctuations of the diurnal tide observed with low-latitude MF and meteor radars during CADRE : Evidence for gravity wave/Tidal interactions" Journal of Geophysical Research. 102, D22. 26,225-26,238 (1997)

T.Nakamura：“CADRE 期间用低纬度 MF 和流星雷达观测到的日潮汐的短期波动：重力波/潮汐相互作用的证据”地球物理研究杂志。

W.Deng: "Coordinated global radar observations of tidal and planetary waves in the mesosphere and lower thermosphere during 20-30 January 1993" Journal of Geophysical Research. 102. 7307-7318 (1997)

W.Deng：“1993 年 1 月 20 日至 30 日期间对中层和低层热层潮汐和行星波的协调全球雷达观测”地球物理研究杂志。

T.Tsuda: "Observations of atmospheric waves in the tropical Pacific with radars and radiosondes" Advances in Space Research. 印刷中.

T.Tsuda：“利用雷达和无线电探空仪对热带太平洋大气波的观测”，空间研究进展，已出版。

S.Kovalam: "Longitudinal variations in planetary wave activity in the equational mesopause" Earth, Planets and Space. (in print).

S.Kovalam：“等式中层顶行星波活动的纵向变化”地球、行星和太空。

R.A.Vincent: "Long-term MF radar observations of solar tides in the low-latitude mesosphere : In-terannual variability and comparisons with the GSWM" Journal of Geophysical Research. 102, D8. 8667-8683 (1998)

R.A.文森特：“低纬度中间层太阳潮汐的长期中频雷达观测：年际变化以及与 GSWM 的比较”地球物理研究杂志。