Gas exchange associated with the coherent air motion within a forest.

与森林内连贯空气运动相关的气体交换。

• 批准号: 10660251
• 负责人: MONJI Nobutaka
• 金额: $ 1.79万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10660251/
• 关键词: Coherent motion; Organized motion; Plume; Forest; Gas exchange; 乱流輸送

The coherent air motion in and above forest canopy is studied based on the field experiments. The experiments were carried out on a 23m tower in a coniferous forest of about 15m. A 3m arm which turns along the wind direction and have fast fine wire thermocouples at both ends was developed to measure the size and translation velocity of the organized motion. The same fine wire thermocouples were installed at 5 different heights on the tower. A 3-D sonic anemometer and an open pass gas analyzer were installed at the top of the tower. The field observation was made during fine days in summer and autumn.The observed coherent organized motions were practically buoyant plumes. They were convective elements which extends vertically. They were found to have a scale of about 10s to 100s meters and to travel with speed greater than the wind speed at the measured height. The organized motion interpenetrated considerably deep into the forest canopy. This organized convective motion was found to play a important rolls in transporting COィイD22ィエD2 and water vapor.

在野外试验的基础上，研究了林冠内和林冠上方的相干空气运动。这些实验是在一片约15米的针叶林中的一座23米高的塔上进行的。为了测量有组织运动的大小和平移速度，研制了一台沿风向旋转的3m臂，两端都有快速的细丝热电偶。同样的细丝热电偶被安装在塔上5个不同的高度。在塔顶安装了三维声速风速计和开路气体分析仪。野外观测是在夏季和秋季的晴天进行的，观测到的连贯的有组织的运动实际上是浮力羽流。它们是垂直延伸的对流元素。他们被发现的规模约为10秒到100米，并以高于测量高度的风速的速度移动。有组织的运动深入到森林树冠相当深的地方。这种有组织的对流运动在CO、ィイ、D22、ィエ、D2和水汽输送中起着重要的作用。