Plume meander and dispersion in a stable boundary layer
Plume meander and dispersion in a stable boundary layer
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DOI：
10.1029/2010jd014102
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发表时间：
2010-11
影响因子：
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通讯作者：
A. Hiscox;David R. Miller;C. Nappo
中科院分区：
文献类型：
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作者：
A. Hiscox;David R. Miller;C. Nappo
[1]对高空烟羽扩散的连续激光雷达测量和相应的微气象资料进行了分析，以建立羽流行为与夜间边界层动力学之间的关系。分析了新墨西哥州沙漠乔尔纳达野战的对比夜晚的数据。气溶胶激光雷达测量用于分离羽流扩散(羽流扩散)和羽流曲折(位移)。用多分辨分解法分离出湍流尺度(S 90)。用湍流动能平稳持续时间和风速稳定时间来刻画局地尺度和亚中尺度湍流。由亚中尺度风运动驱动的羽流曲折是弱风和变风以及强稳定度下水平羽流总扩散的主要原因。这一比例在大风(即>；4米S−1)、弱稳定条件下减少，但仍是主要的扩散机制。在所有情况下，羽流弥散的其余部分是由羽流的内部扩散所解释的，这是一个由湍流驱动的小涡扩散过程。结果表明，湍流平稳性和风稳定性分别与羽流扩散和羽流弯曲密切相关。
[1] Continuous lidar measurements of elevated plume dispersion and corresponding micrometeorology data are analyzed to establish the relationship between plume behavior and nocturnal boundary layer dynamics. Contrasting nights of data from the JORNADA field campaign in the New Mexico desert are analyzed. The aerosol lidar measurements were used to separate the plume diffusion (plume spread) from plume meander (displacement). Mutiresolution decomposition was used to separate the turbulence scale ( 90 s). Durations of turbulent kinetic energy stationarity and the wind steadiness were used to characterize the local scale and submesoscale turbulence. Plume meander, driven by submesoscale wind motions, was responsible for most of the total horizontal plume dispersion in weak and variable winds and strong stability. This proportion was reduced in high winds (i.e., >4 m s−1), weakly stable conditions but remained the dominant dispersion mechanism. The remainder of the plume dispersion in all cases was accounted for by internal spread of the plume, which is a small eddy diffusion process driven by turbulence. Turbulence stationarity and the wind steadiness are demonstrated to be closely related to plume diffusion and plume meander, respectively.