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夜间稳定边界层中间歇性湍流热通量的提取及其谱特征

刘磊 胡非 程雪玲

刘磊, 胡非, 程雪玲. 夜间稳定边界层中间歇性湍流热通量的提取及其谱特征[J]. 大气科学, 2012, 36(6): 1280-1288. doi: 10.3878/j.issn.1006-9895.2012.12065
引用本文: 刘磊, 胡非, 程雪玲. 夜间稳定边界层中间歇性湍流热通量的提取及其谱特征[J]. 大气科学, 2012, 36(6): 1280-1288. doi: 10.3878/j.issn.1006-9895.2012.12065
LIU Lei, HU Fei, CHENG Xueling. Extraction of Intermittent Turbulent Heat Fluxes and Their Spectrum Characteristics in the Nocturnal Stable Boundary Layer[J]. Chinese Journal of Atmospheric Sciences, 2012, 36(6): 1280-1288. doi: 10.3878/j.issn.1006-9895.2012.12065
Citation: LIU Lei, HU Fei, CHENG Xueling. Extraction of Intermittent Turbulent Heat Fluxes and Their Spectrum Characteristics in the Nocturnal Stable Boundary Layer[J]. Chinese Journal of Atmospheric Sciences, 2012, 36(6): 1280-1288. doi: 10.3878/j.issn.1006-9895.2012.12065

夜间稳定边界层中间歇性湍流热通量的提取及其谱特征

doi: 10.3878/j.issn.1006-9895.2012.12065
基金项目: 国家自然科学基金资助项目41105005;国家重点基础研究发展计划资助项目2010CB951804;国家科技支撑计划资助项目2008BAC37B02

Extraction of Intermittent Turbulent Heat Fluxes and Their Spectrum Characteristics in the Nocturnal Stable Boundary Layer

  • 摘要: 在夜间稳定边界层中, 湍流热通量往往具有间歇性特征。在一阵阵出现的强度较大的湍流热通量之间, 混杂着弱噪声或其他微弱的难以辨识的高频脉动信号。为了研究间歇性湍流热通量的特征, 必须将这些无关信 号剔除, 以提取出干净的湍流热通量。本文提出了一种新的提取间歇性湍流热通量的方法, 该方法通过分析 湍流热通量的概率密度函数, 并与稳定分布进行比较, 湍流热通量的概率密度函数开始偏离稳定分布的位置, 即是间歇性湍流热通量开始出现的阈值。本文通过夜间稳定边界层外场试验数据的验证, 发现利用稳定分布确定 的阈值可有效地提取出间歇性湍流热通量。在此基础之上, 本文对比了提取前后湍流热通量的功率谱, 发现 提取后低频信号的方差所占比重下降, 而高频信号略有上升。此外, 间歇性湍流热通量在高频区的功率谱满足“-7/6”律。
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出版历程
  • 收稿日期:  2012-04-19
  • 修回日期:  2012-06-07

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