Collaborative Experiments of Convection and Gravity Waves

对流与重力波的协同实验

基本信息

批准号：
11694075
负责人：
TSUDA Toshitaka
金额：
$ 13.18万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11694075/
关键词：
gravity wave intra-seasonal oscillation radiosonde cumulus convection airglow MF radar equatorial waves vertical wavenumber spectra 赤道域成層圏中間圏熱帯大気レーダー CCDイメージャー

项目摘要

1. Balloon Observation of the troposphere and the stratosphereBy using daily radiosonde soundings from 1993 to 1996 in the equatorial Kalimantan, we have investigated long-term variability of atmospheric gravity waves and found their seasonal variation in the troposphere and a modulation by the Quasi-Biennial Oscillation in the stratosphere.We have conducted an observational campaign to launch radiosondes 4 times daily at three sites in each of Java, Sumatra, and Kalimantan Islands from November to December, 2000. Gravity waves were identified in the stratosphere, and their latitudinal dependence was revealed. Vertical wavenumber spectra showed tails with a -3 exponent down to the vertical wave length of 200m. Conventional theories have explained this feature in terms of saturation of gravity waves. Interestingly, however, it was shown that no saturation was seen in the observed lower stratosphere.2. Observation of gravity waves with all-sky imagersAn all-sky imager was installed in the suburb of Bandung, Indonesia to observe gravity waves projected onto OH airglow. We have successfully observed gravity waves at altitudes around 90km and studied horizontal structure and propagation. It was found that their propagation was mostly southward. The observation will be continued and is expected to provide data to reveal seasonal and year-to-year variability of the gravity waves.3. Observation of the mesosphere and lower thermosphere (MLT) by MF and meteor radarsA new antenna was added to the MF radar in Kalimantan in order to make it capable of measuring the momentum flux associated with waves in the MLT region. With the MF radar and a meteor radar in Java, long-term variation of gravity waves and long-period planetary-scale waves were investigated. Activities of gravity and Kelvin waves were found to be weak throughout two years from 1996. It was also found that waves with 30- to 60-day periods correlate well with tropospheric intra-seasonal oscillation.

1。在1993年至1996年间，在赤道卡利门坦（Kalimantan）中使用日常辐射响应声对对流层和平流层进行观察，我们已经调查了大气重力波的长期变化，并发现了对流层中的季节性变化，并发现了每天在平面群体中进行单个练习的调节。从2000年11月到12月，在爪哇，苏门答腊和卡利曼丹群岛上。垂直的波数光谱显示尾巴的尾部为-3指数向下垂直波长200m。传统理论在重力波的饱和方面解释了这一特征。然而，有趣的是，发现在观察到的较低平流层中没有看到饱和。2。在印度尼西亚郊区安装了使用全天空命的全天空成像仪观察重力波，以观察投影到OH Airglow上的重力波。我们已经成功地观察到了90公里左右的高度的重力波，并研究了水平结构和传播。发现他们的繁殖大部分是向南的。该观察结果将继续进行，并有望提供数据以揭示重力波的季节性和年度变化。3。将MF和流星Radarsa新天线添加到Kalimantan中的MF雷达，以使其能够测量与MLT区域的波浪相关的动量通量。随着MF雷达和Java中的流星雷达，重力波和长期行星尺度波的长期变化被研究。从1996年开始的两年中，发现重力和开尔文波的活性较弱。还发现，具有30至60天的波浪与对流层季节内振荡息息相关。