Influence of advection on the characteristics of turbulence over uneven surface in the oasis and the Gobi Desert

作     者：CHEN JinBei HU YinQiao Lü ShiHua YU Ye 

作者机构：Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Cold and Arid Regions Environment and Engineering Institute Chinese Academy of Sciences 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2014年第57卷第11期

页      面：2242-2258页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the National Basic Research Program of China (Grant No.2010CB951701-2) the National Natural Science Foundation of China (Grant Nos. 91025011, 41130961) the Pingliang Station of Lightning and Hail Research, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences 

主　　题：atmospheric surface layer (ASL) turbulence similarity theory advection uneven surface 

摘      要：Utilizing experimental data of the atmospheric surface layer in the Gobi Oasis of Jinta in a comparative study, we demonstrate that under the condition of unstable stratification, the normalization variances of temperature in the oasis and Gobi Desert meetφs （z∧）= φθ（Z/∧） =αθ（-Z/ ∧）-1/3 while normalization variances of both humidity and CO2 in the oasis meet φ（Z/∧）= αs （1 - βs z /∧）-1/3 ; the normalization variance of temperature in the oasis is large due to disturbance by advection, whereas variance of CO2 in the Gobi Desert has certain degree of deviation relative to Monin-Obukhov （M-O） scaling, and humidity variance completely deviates from variance M-O scaling. The above result indicates that under the condition of advection, hu-midity variance meets the relation δ2 sm=D2 δ2SA ＋ δ2SB and it is determined by relative magnitude of scalar variance of ad- midity variance meets the relation δsm = D2δsA ＋ δsB vection transport. Our study reveals that, if the scalar variance of humidity or CO2 transported by advection is much larger than local scalar variance, observation value of scalar variance will deviate from M-O scaling; when scalar variance of advection transport is close to or less than local scalar variance, the observation value of scalar variance approximately meets M-O scal- ing.