A Case Study of the Weather Research and Forecasting Model Applied to the Joint Urban 2003 Tracer Field Experiment. Part 1: Wind and Turbulence

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• 作者：Matthew A. Nelson ; Michael J. Brown ; Scot A. Halverson…
• 关键词：Atmospheric surface ; layer winds ; Turbulence ; Urban transport and dispersion ; Vertical structure ; Weather Research and Forecasting
• 刊名：Boundary-Layer Meteorology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：158
• 期：2
• 页码：285-309
• 全文大小：4,518 KB
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• 作者单位：Matthew A. Nelson (1)
  Michael J. Brown (1)
  Scot A. Halverson (1)
  Paul E. Bieringer (2)
  Andrew Annunzio (3)
  George Bieberbach (2)
  Scott Meech (4)
  
  1. Los Alamos National Laboratory, MS F609, PO Box 1663, Los Alamos, NM, 87545, USA
  2. Aeris, 1723 Madison CT, Louisville, CO, 80027, USA
  3. Citadel, 131 South Dearborn Street, Chicago, IL, 60603, USA
  4. Science and Technology in Atmospheric Research (STAR) LLC, 3125 Sterling Circle, Suite 107, Boulder, CO, 80301, USA
  
• 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

Numerical-weather-prediction models are often used to supply the mean wind and turbulence fields for atmospheric transport and dispersion plume models as they provide dense horizontally- and vertically-resolved geographic coverage in comparison to typically sparse monitoring networks. Here, the Weather Research and Forecasting (WRF) model was run over the month-long period of the Joint Urban 2003 field campaign conducted in Oklahoma City and the simulated fields important to transport and dispersion models were compared to measurements from a number of sodars, tower-based sonic anemometers, and balloon soundings located in the greater metropolitan area. Time histories of computed wind speed, wind direction, turbulent kinetic energy (e), friction velocity (\(u_*\)), and reciprocal Obukhov length (1 / L) were compared to measurements over the 1-month field campaign. Vertical profiles of wind speed, potential temperature (\(\theta \)), and e were compared during short intensive operating periods. The WRF model was typically able to replicate the measured diurnal variation of the wind fields, but with an average absolute wind direction and speed difference of \(35^\circ \) and \(1.9\hbox { m s}^{-1}\), respectively. Using the Mellor-Yamada-Janjic (MYJ) surface-layer scheme, the WRF model was found to generally underpredict surface-layer TKE but overpredict \(u_*\) that was observed above a suburban region of Oklahoma City. The TKE-threshold method used by the WRF model’s MYJ surface-layer scheme to compute the boundary-layer height (h) consistently overestimated h derived from a \(\theta \) gradient method whether using observed or modelled \(\theta \) profiles. Keywords Atmospheric surface-layer winds Turbulence Urban transport and dispersion Vertical structure Weather Research and Forecasting