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大涡模式垂直分辨率在夹卷及示踪物垂直传输模拟结果分析中的作用
王蓉1, 黄倩2, 岳平3, 王敏仲4
(1.甘肃省人工影响天气办公室;2.兰州大学大气科学学院半干旱气候变化教育部重点实验室;3.中国气象局干旱气象研究所甘肃省干旱气候变化与减灾重点实验室;4.中国气象局乌鲁木齐沙漠气象研究所)
Effect of large eddy vertical resolution on analysis of entrainment and tracer vertical transport simulation
wangrong1, huangqian2, yueping3, wangminzhong4
(1.Gansu Weather Modification Office;2.Key Laboratory for Semi-Arid Climate Change of the Ministry Education, College of Atmospheric Sciences, Lanzhou University;3.Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Institute of Arid Meteorology, China Meteorological Administration;4.Institute of Desert Meteorology)
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投稿时间:2018-09-21    修订日期:2019-01-25
中文摘要: 基于敦煌野外观测资料和大涡模式,研究了垂直方向不同尺度湍涡对夹卷及示踪物垂直传输的影响,明确了模式垂直分辨率在模拟结果分析中的作用。结果表明:垂直方向上小尺度湍涡对夹卷作用贡献更大,小尺度湍涡较多时夹卷层相对更暖,夹卷层厚度、夹卷强度和风速变化受垂直方向湍涡尺度影响较小。当垂直分辨率为50m时,越往夹卷层上部,上升气流和下沉气流分布较多且强度较大;分辨率为10m、20m和30m时,夹卷层各高度垂直速度、位温和示踪物浓度分布较接近。另外,垂直方向湍涡尺度对示踪物垂直传输高度影响不大,而对示踪物的空间分布有一定作用。当大尺度湍涡较多且强度较强时,越有利于将高浓度的示踪物向上传输。综合考虑到模式采用较高分辨率模拟时产生的噪音及计算时间等问题,认为模式采用30m的垂直分辨率,既能较好地模拟出夹卷层平均结构特征,又能模拟出夹卷层湍流的精细分布,是较为理想的选择。
Abstract:The effects of different scales of turbulent vortices in vertical direction on entrainment process and vertical transmission of tracers were studied, and the role of model vertical resolution in the analysis of simulation results was clarified by using field intensive observation data in Dunhuang and large eddy model (LEM). The results show that, in the vertical direction, the small scale turbulence contributed more to the entrainment, and the small scale turbulences were more, the clamping layer was warmer. However, the thickness, strength and wind speed of the clamping layer were less affected by the scale of the vertical direction turbulent vortices. Over the upper part of the entrainment layer, the updrafts and downdrafts flow were distributed more and more intensively in the 50m vertical resolution test. The distributions of vertical velocities, potential and tracer concentration at different heights of the clamping layer has little differences in the 10m、20m and 30m vertical resolution tests. In addition, the vertical turbulent vortices scales has little effects on the tracer vertical transport height, but has a certain affect on the spatial distribution of tracer. When the large scale turbulences were more and stronger, high concentration tracer vertical transmissions were more favorable. Considering the greater the noise generated in the simulation process and the longer computing time by the high resolution simulations, the use of 30 m grid spacing as LEM vertical resolution in simulating is an ideal choice, which the model can not only simulate the average structure of the entrainment layer, but also the very fine turbulence distribution in the clamping layer could be simulated.
文章编号:201809210413     中图分类号:    文献标志码:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
引用文本:
王蓉,黄倩,岳平,王敏仲,0.[en_title][J].Meteor Mon,():-.
wangrong,huangqian,yueping,wangminzhong,0.Effect of large eddy vertical resolution on analysis of entrainment and tracer vertical transport simulation[J].Meteor Mon,():-.