Observations of the Early Evening Boundary-Layer Transition Using a Small Unmanned Aerial System
Observations of the Early Evening Boundary-Layer Transition Using a Small Unmanned Aerial System
复制标题
使用小型无人机系统观测傍晚边界层转变
DOI：
10.1007/s10546-012-9760-3
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发表时间：
2012
影响因子：
4.3
通讯作者：
E. Fedorovich
中科院分区：
文献类型：
--
作者：
T. Bonin;P. Chilson;B. Zielke;E. Fedorovich
使用俄克拉荷马大学开发的小型多功能研究和教学探空器（SMARTSonde）研究行星边界层下部的演化。该研究重点关注大气层最低 200 米处，那里白天发生最明显的热力学变化。 2010年10月至2011年2月期间，连续几天在晚上进行了一系列飞行，以检查下边界层的垂直结构。来自附近俄克拉荷马州 Mesonet 塔的数据用于补充温度、湿度和压力的垂直分布，这些数据大约每 30 分钟收集一次，从日落前 2 小时开始一直持续到黄昏。根据剖面，估计了感热通量和潜热通量。这些通量用于诊断受傍晚转变影响最大的边界层部分。在过渡期间，靠近地面形成了一层浅薄的凉爽潮湿层，随着夜幕降临，冷却影响了地表上方越来越浅的层。
The evolution of the lower portion of the planetary boundary layer is investigated using the Small Multifunction Research and Teaching Sonde (SMARTSonde), an unmanned aerial vehicle developed at the University of Oklahoma. The study focuses on the lowest 200 m of the atmosphere, where the most noticeable thermodynamic changes occur during the day. Between October 2010 and February 2011, a series of flights was conducted during the evening hours on several days to examine the vertical structure of the lower boundary layer. Data from a nearby Oklahoma Mesonet tower was used to supplement the vertical profiles of temperature, humidity, and pressure, which were collected approximately every 30 min, starting 2 h before sunset and continuing until dusk. From the profiles, sensible and latent heat fluxes were estimated. These fluxes were used to diagnose the portion of the boundary layer that was most affected by the early evening transition. During the transition period, a shallow cool and moist layer near the ground was formed, and as the evening progressed the cooling affected an increasingly shallower layer just above the surface.