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Turbulence Intensity and Turbulent Kinetic Energy Parameters over a heterogeneous terrain of Loess Plateau

Advances in Atmospheric Sciences 2015年第9期32卷 1291-1302页

作者： YUE Ping ZHANG Qiang WANG Runyuan LI Yaohui WANG Sheng Key Laboratory of Arid Climatic Change and Reducing Deserter of Gansu Province Institute of Arid MeteorologyChina Meteorological Administration

A deep understanding of turbulence structure is important for investigating the characteristics of the atmospheric boundary layer,especially over heterogeneous *** the present study,turbulence intensity and turbulent kinetic energy（TKE）parameters are analyzed for different conditions with respect to stability,wind direction and wind speed over a valley region of the Loess Plateau of China during December 2003 and January *** purpose of the study is to examine whether the observed turbulence intensity and TKE parameters satisfy Monin–Obukhov similarity theory（MOST）,and analyze the wind shear effect on,and thermal buoyancy function of,the TKE,despite the terrain *** results demonstrate that the normalized intensity of turbulence follows MOST for all stability in the horizontal and vertical directions,as well as the normalized TKE in the horizontal *** shear effect of the wind speed in the Loess Plateau region is strong in winter and could enhance turbulence for all stability *** daytime,the buoyancy and shear effect together constitute the generation of TKE under unstable *** night,the contribution of buoyancy to TKE is relatively small,and mechanical shearing is the main production form of turbulence.

关键词： heterogeneous terrain turbulence intensity turbulent kinetic energy Monin–Obukhov similarity function

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On the Determination and Characteristics of Effective Roughness Length for heterogeneous terrain

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Advances in Atmospheric Sciences 2003年第1期20卷 71-76页

作者：钟中赵鸣苏炳凯汤剑平 Eco-Environmental Research Center Institute of MeteorologyPLA University of Sciences and Engineering Nanjing 211101Department of Atmospheric Sciences Nanjing University Nanjing 210093 Department of Atmospheric Sciences Nanjing University Nanjing 210093

A new method is proposed for the effective roughness length (ERL) in heterogeneous terrain based on the principle of equalisation of momentum or heat fluxes calculated by the drag coefficient parameterization scheme used in the ECMWF numerical model. Compared with the area-weighted logarithmically averaged ERL (drag coefficient), the newly calculated ERL (drag coefficient) is about 40% (16%) larger with a roughness step of 2.3. These differences reach their maximum values when the ratio of smooth to rough surface is 60% to 40%. Since the determination by this method is not sensitive to the atmospheric stratification, it is suitable for use in climate models.

关键词： heterogeneous terrain effective roughness length turbulent flux climate model

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