Anomalous scaling of mesoscale tropospheric humidity fluctuations
Anomalous scaling of mesoscale tropospheric humidity fluctuations
复制标题
中尺度对流层湿度波动的异常标度
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
G. Sachse
中科院分区：
文献类型：
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作者：
John Y. N. Cho;R. Newell;G. Sachse
在整个对流层中以前所未有的10 m分辨率测量和分析水蒸气波动。结构函数的计算表明，研究飞机在太平洋上空观测到的比湿变化在水平距离约50米至100公里范围内表现出异常标度。海洋边界层、热带自由对流层和热带外自由对流层的标度律表现出不同的特征。更具体地说，边界层湿度波动比自由对流层中的湿度波动更不平滑和更稳定，而对流层外的自由对流层变化比其他两个区域的变化更少间歇性。异常标度的结果反对被动平流的空间平滑流（混沌平流）在这些尺度。
Water vapor fluctuations are measured and analyzed at an unprecedented 10‐m resolution throughout the troposphere. Computation of structure functions shows that specific humidity variations observed by research aircraft over the Pacific Ocean exhibit anomalous scaling from about 50 m to 100 km in horizontal range. The scaling laws show different characteristics for the marine boundary layer, the tropical free troposphere, and the extratropical free troposphere. More specifically, boundary‐layer humidity fluctuations are less smooth and more stationary than those in the free troposphere, while the extratropical free tropospheric variations are less intermittent than those in the other two regions. The anomalous scaling results argue against passive advection by a spatially smooth flow (chaotic advection) at these scales.