Characteristics of the vertical structure of the atmospheric turbulence in the Tibetan Plateau  

作　　者：Kun ZHANG Yang WU Feifei WANG Xuebin LI Shengcheng CUI Zihan ZHANG Xiaoqing WU Ningquan WENG Tao LUO Yinbo HUANG 

机构地区：[1]School of Environmental Science and Optoeclectronic Technology,University of Science and Technology of China,Hefei 230026,China [2]Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics(AIOFM),Chinese Academy of Sciences,Hefei 230031,China [3]Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,China [4]Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,China

出　　处：《Science China Earth Sciences》2022年第7期1368-1378,共11页中国科学（地球科学英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Class A)(Grant No.XDA17010104);the National Natural Science Foundation of China(Grant Nos.4157685&91752103)。

摘　　要：The Tibetan Plateau(TP)has unique atmospheric dynamics and thermal structures that originate from its giant terrain and complex climate.High vertical-resolution thermal radiosondes were launched near the central(Lhasa,91°06′E,29°36′N,3670 m above sea level(ASL))and marginal(Da Qaidam,95°21′E,37°51′N,3180 m ASL)areas of the TP during the summers of 2018 and 2020,respectively.Atmospheric turbulence parameters were calculated,and the characteristics of the atmospheric turbulent vertical structure at sunset in these two areas were analyzed and compared.Affected by TP thermal forcing and stably controlled by the summer monsoon anticyclone,the atmospheric refractive index structure constant(C_(n)^(2))tended to increase and then decrease with increasing height,reaching a maximum at the tropopause(~18 km ASL)at the Lhasa site.Although C_(n)^(2) at the Da Qaidam site also tended to increase at the tropopause,the position of the strong turbulent band(STB)(5–7 km ASL)was below the tropopause height corresponding to the potential temperature lapse rate minimum.The vertical distribution of C_(n)^(2) at the two sites,particularly regarding the position of the STB,was highly correlated with the atmospheric stability(Ri)and the thermal mixing scale(L_(T)).The significant correlations among the three parameters(STB,Ri,and L_(T))indicated that the strong fluctuations in temperature caused by thermal mixing were the dominant factor causing the Ri to be less than its critical value of 0.25.Moreover,the suppression strength involving the upward transport of the heat sources was the main reason for the different turbulent vertical structures and STB positions at the two sites.The zonal mean thermodynamic and dynamical fields derived from the reanalysis data also showed a height difference in the heat sources transported to the troposphere at the two sites.In the marginal TP,the material and energy in the lower troposphere were transported by the turbulent atmosphere upward along the slope of the mountain and converged at

关 键 词：Tibetan Plateau Strong turbulent band Thermal forcing Stratosphere-troposphere exchange TROPOPAUSE 

分 类 号：P421.3[天文地球—大气科学及气象学]