Observational study on cirriform clouds in the tropical upper troposphere

热带对流层高层卷状云的观测研究

基本信息

批准号：
16340139
负责人：
FUKAO Shoichiro
金额：
$ 10.5万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16340139/
关键词：
cirriform clouds troposphere tropics cumulus convection remote sensing millimeter-wave radar wind profiler lidar 中緯度レーダー

项目摘要

Cirriform clouds (cirrus, cirrostratus, cirrocumulus) existing in the upper part of the troposphere consist almost entirely of ice particles, and are known to play a significant role in regulating the radiation balance of the earth-atmosphere system. However, mechanisms which control generation, maintenance, and dissipation of cirriform clouds in the tropics are not well understood due to a scarcity of observations in the region. In this research project, an observation campaign of cirriform clouds using VHF wind profiler to observe vertical wind, W-band Doppler radar to observe falling velocity of ice particles in clouds, lidar to observe small-sized ice particles, weather radar to observe precipitating particles, and radiosonde to observe vertical profiles of temperature and humidity has been carried out at Kototabang, West Sumatra, Indonesia (at latitude 0.2 degrees south and longitude 100.32 degrees east).From detailed data analysis using data derived from the observation campaign, time-altitude variations of vertical wind in and around tropical cirriform clouds has been shown for the first time. Further, effects of vertical wind on particle falling velocity in cirriform clouds are studied in detail. Using vertical wind data observed by a VHF wind profiler installed at Kototabang (the Equatorial Atmosphere radar), vertical wind changes in the middle and upper troposphere associated with eastward-moving synoptic-scale cumulus activity (Yamamoto et al., in press), fine time-altitude variations of vertical wind in the precipitating stratiform region (Nishi et al., 2007) and vertical motion of cirriform clouds in the middle troposphere (Seto et al., 2006) have been studied and published. This research project has demonstrated that a combination of VHF wind profiler and other instruments to observe inside of cirriform clouds is useful to observe processes related to such clouds.

在对流层上部存在的卷心云（卷卷，卷质，卷，卷卷）几乎完全由冰颗粒组成，并且已知在调节地球 - 大气系统的辐射平衡方面起着重要作用。然而，由于该地区的观察稀缺，无法很好地理解热带圆锥状云的产生，维持和耗散的机制。 In this research project, an observation campaign of cirriform clouds using VHF wind profiler to observe vertical wind, W-band Doppler radar to observe falling velocity of ice particles in clouds, lidar to observe small-sized ice particles, weather radar to observe precipitating particles, and radiosonde to observe vertical profiles of temperature and humidity has been carried out at Kototabang, West Sumatra, Indonesia （在纬度为0.2度，向南和经度向东100.32度）。从观测活动中得出的数据从详细的数据分析中，首次显示了热带圆锥状云中垂直风和周围周围的垂直风变化。此外，详细研究了垂直风对cirriorm云中粒子降落速度的影响。使用安装在Kototabang（赤道大气雷达）的VHF风剖面观察到的垂直风数据，中间和上层对流层中的垂直风变化，向东移动的天气量表库卢斯活性（Yamamoto等人，在媒体中），良好的时间 - 垂直于垂直的垂直变化（均为均一的垂直）区域（Nishi），NISHI区域（Nishi）（Nishi）（Nishi）（Nishi）（Nishi sectible）（Nishi）（Nishi and）。对流层中部的卷云（Seto等，2006）已被研究和发表。该研究项目表明，VHF风剖面和其他仪器的组合可以观察到与此类云相关的过程有用。