摘要
This study evaluates the spatial distributions in the quality of momentum and sensible heat fluxes,and determines the turbulent transfer characteristics with quality-controlled observations.The research is based on raw turbulence data collected over a Gobi surface in the Dunhuang area in June 2004.The results indicate that part of the momentum fluxes are of poor quality in the daytime and nighttime.The poor quality of the momentum fluxes in the daytime is mainly attributed to the development of turbulence.The footprint reveals that,in general,the momentum fluxes and sensible heat fluxes can be measured well in the east and west upwind sectors under unstable conditions.The relationship between the non-dimensional standard deviation of the wind components and atmospheric stability follow the "1/3 power law",which supports the Monin-Obukhov similarity theory.Moreover,this study identifies a clear disturbance in the measurements surrounding the Gobi surface.The momentum roughness length of z0m=0.59 mm is determined after excluding such disturbance,and the additional resistance during the daytime is proposed to be an average of 3.1,although its actual value is highly scattered.This study discusses the applicability of several thermodynamic parameterization schemes for the Gobi surface.The results show that the scheme κB-1=3.1 can represent well the summer diurnal turbulent heat transfer.
This study evaluates the spatial distributions in the quality of momentum and sensible heat fluxes, and determines the turbulent transfer characteristics with quality-controlled observations. The research is based on raw turbulence data collected over a Gobi surface in the Dunhuang area in June 2004. The results indicate that part of the momentum fluxes are of poor quality in the daytime and nighttime. The poor quality of the momentum fluxes in the daytime is mainly attributed to the development of turbulence. The footprint reveals that, in general, the momentum fluxes and sensible heat fluxes can be measured well in the east and west upwind sectors under unstable conditions. The relationship between the non-dimensional standard deviation of the wind components and atmospheric stability follow the ＂1/3 power law＂, which supports the Monin-Obukhov similarity theory. Moreover, this study identifies a clear disturbance in the measurements surrounding the Gobi surface. The momentum roughness length of Z0m=0.59 mm is determined after excluding such disturbance, and the additional resistance during the daytime is proposed to be an average of 3.1, although its actual value is highly scattered. This study discusses the applicability of several thermodynamic parameterization schemes for the Gobi surface. The results show that the scheme κB^-1=3.1 can represent well the summer diurnal turbulent heat transfer.
基金
supported by National Basic Research Program of China (Grant No. 2009CB421405)
National Natural Science Foundation of China (Grant No. 40730952)
Open Fund of Regional Climate-Environment Research for Temperate East Asia,Chinese Academy of Sciences
