Contribution of Low-Frequency Motions to Sensible Heat Fluxes over Urban and Suburban Areas

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• 作者：He Zhang ; Hongsheng Zhang ; Xuhui Cai ; Yu Song ; Jianning Sun
• 关键词：Large ; aperture scintillometer ; Lower frequency ; Multiresolution decomposition ; Sensible heat flux ; Urban and suburban terrain
• 刊名：Boundary-Layer Meteorology
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：161
• 期：1
• 页码：183-201
• 全文大小：3,522 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Meteorology and Climatology
  Atmospheric Protection, Air Quality Control and Air Pollution
  
• 出版者：Springer Netherlands
• ISSN：1573-1472
• 卷排序：161

文摘

Field observations of the atmospheric boundary layer were made over urban and suburban terrain in the Yangtze River Delta, China. A multiresolution decomposition was applied over three different types of terrain: flat homogeneous terrain, suburban terrain and urban terrain, with results indicating that, (1) the average scale contribution of u, v, w and \(T_{v}\) had a similar variability with length scale for all these three sites respectively, and the dimensionless length scale corresponding to the maximum sensible heat flux contribution increased with the terrain complexity; (2) the length scale corresponding to the maximal average scale contribution for vertical wind velocity \(\lambda _w \) was directly proportional to the roughness length \(z_{0}\) in unstable conditions; and (3) the contributions of large-scale motions led to sensible heat fluxes determined with a large-aperture scintillomter being larger than those using the eddy-covariance method for the suburban case, whereas this phenomenon was not substantial for the urban case.