Boundary Layer and Mesoscale Structure over Lake Michigan during a Wintertime Cold Air Outbreak
Boundary Layer and Mesoscale Structure over Lake Michigan during a Wintertime Cold Air Outbreak
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冬季冷空气爆发期间密歇根湖的边界层和中尺度结构
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
M. Hart
中科院分区：
文献类型：
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作者：
E. Agee;M. Hart
根据研究飞机1赫兹和20赫兹的资料，对密歇根湖冬季冷空气爆发期间的云顶边界层进行了研究，得到了边界层内5个垂直堆叠的水平。对于热场、水汽场和动量场，以及谱分解和湍流通量统计，已经为这次偏北气流事件准备了平均东西横截面。结果基于三个广义空间域进行解释：中尺度≥5公里，大涡100m-lt；5公里，高频湍流100m。在平均断面上发现的中尺度结构包括低密歇根陆风，强离岸辐合雪带，湖面云街和降水带，以及逆温层附近的卷吸尖峰。颗粒浓度、大小和液态水含量的分析也在平均截面上给出，它们与所有可识别的中观介质相一致。
Abstract An investigation of a cloud-topped boundary layer during a wintertime cold air outbreak over Lake Michigan has been conducted based on research aircraft 1 and 20 Hz data for five vertically-stacked levels within the boundary layer. Mean east-west cross sections for this northerly flow event have been prepared for heat, moisture, and momentum fields along with spectral decomposition and turbulent flux statistics. Results have been interpreted on the basis of three generalized spatial domains: mesoscale ≥5 km, large eddies from 100 m to <5 km, and higher frequency turbulence <100 m. Mesoscale structures identified in the mean cross-sections include the lower Michigan land breeze, a strong offshore convergence snow band, cloud streets and precipitation bands over the lake, and entrainment spikes in the vicinity of the inversion layer. Analyses of particle concentrations, sizes, and liquid water content have also been presented in mean cross sections, which correspond well with all identifiable mesos...