Acoustic remote sensing of planetary boundary layer dynamics near Ross Island, Antarctica
Acoustic remote sensing of planetary boundary layer dynamics near Ross Island, Antarctica
复制标题
南极洲罗斯岛附近行星边界层动力学的声学遥感
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
D. Bromwich
中科院分区：
文献类型：
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作者：
Zhongze Liu;D. Bromwich
自本世纪初以来，人们一直在研究南极罗斯岛和小屋角半岛的阻塞效应。由于缺乏边界层风的连续测量，调查仅限于对阻塞效应的总体描述，没有关于日变化或接近气流的详细垂直结构的信息。1990/91年南极夏季，在南极洲罗斯岛以南逆风区的威廉姆斯场部署了一个声学探测器（声达）。这种设备可以从地面以上几十米到几百米的高度连续测量三维风，从而为研究稳定分层的行星边界层的动态提供了一个新的机会。除了证实早期的工作，声雷达风显示了阻塞效应的显著日变化，随高度增加而放大。这种变化是由上游空气质量的变化所主导的。
Abstract The blocking effect of Ross Island and Hut Point peninsula, Antarctica, has been investigated since the early part of this century. Due to lack of continuous measurements of boundary-layer winds, the investigations were limited to an overall description of the blocking effect with no information on the diurnal variation or the detailed vertical structure of the approaching airflow. An acoustic sounder (sodar) was deployed during the 1990/91 austral summer season at Williams Field in the upwind area south of Ross Island, Antarctica. Such equipment can continuously measure three-dimensional winds from a few tens of meters above the surface up to an altitude of several hundred meters, thus providing a new opportunity to study the dynamics of the stably stratified planetary boundary layer. In addition to confirming earlier work, the sodar winds show a significant diurnal variation of the blocking effect, which amplifies with height. Such variation is dominated by the changes in the upstream air mass ...