Surface Stress with Non-stationary Weak Winds and Stable Stratification

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• 作者：L. Mahrt ; Christoph K. Thomas
• 关键词：Nocturnal boundary layer ; Non ; stationarity ; Stable boundary layer ; Stratified turbulence ; Submeso
• 刊名：Boundary-Layer Meteorology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：159
• 期：1
• 页码：3-21
• 全文大小：2,149 KB
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• 作者单位：L. Mahrt (1)
  Christoph K. Thomas (2)
  
  1. NorthWest Research Associates, 2171 NW Kari Pl, Corvallis, OR, 97330, USA
  2. Micrometeorology Group, University of Bayreuth, 95540, Bayreuth, Germany
  
• 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

文摘

The behaviour of turbulent transport in the weak-wind, stably-stratified, boundary layer over land is examined in terms of the non-stationarity of the wind field using measurements from three field programs. These field programs include towers ranging from 12 to 20 m in height and an extensive horizontal network of sonic anemometers. The relationship of the friction velocity to the stratification and non-stationary submeso motions is investigated from several points of view and nominally quantified. The relationship of the turbulence to the stratification is less systematic than expected partly due to enhancement of the turbulence by submeso motions. Cause and effect relationships are difficult to isolate because the non-stationary momentum flux significantly modifies the profile of the non-stationary mean flow. The link between the turbulence and accelerations at the surface is examined in terms of the changing vertical structure of the wind profile and sudden increases in the downward transport of momentum.