中文摘要：

湍流运动是大气最基本的运动特征,是地气间能量物质交换的主要方式。利用2014年7月18日至8月31日青藏高原中部聂荣观测站的近地层湍流观测资料,分析了该地区近地层湍流统计特征以及近地层通量的日变化特征。结果表明：在不稳定和稳定层结下,风速分量归一化标准差σ_u/u_＊,σ_v/u_＊,σ_w/u_＊与稳定度参数z/L满足相似理论的＂1/3＂定律,近中性条件下趋于常数,并表现为σ_u/u_＊≈σ_v/u_＊〉σ_w/u_＊;在不稳定层结下,温度、水汽密度和CO_2浓度归一化标准差σT/｜T＊｜、σq/｜q_＊｜和σ_C/｜C_＊｜与｜z/L｜满足＂-1/3＂定律,在近中性层结下趋于常数,且明显大于青藏高原其他地区。湍流在风速0 m·s~（-1）I_w。夏季潜热通量大于感热通量,CO_2通量的日变化以吸收为主,最强达到0.46 mg·m~（-2）·s~（-1）。

英文摘要：

Turbulence is the basic characteristic of atmospheric motion and main way of matter and energy exchange between land and air. Based on the turbulence data observed at Nyainrong station,central part of QinghaiTibetan Plateau,from 18 July to 31 August 2014,the variation of turbulent statistical parameters and the energy exchange near surface layer were analyzed. The results showthat the relationship between the normalized standard deviation of wind velocity components σ_u/u_＊,σ_v/u_＊,σ_w/u_＊ and stability parameter z/L satisfies the ＂1/3＂power lawin stable/unstable stratifications. Under the near-neutral stratification condition,normalized standard deviations are approximately constant,and σ_u/u＊≈σ_v/u_＊ σ_w/u_＊. The relationship between the normalized standard deviations of temperature,humidity and CO_2 concentration σ_T/｜ T_＊｜,σ_q/｜ q_＊｜,σ_C/｜ C_＊｜ and stability parameter ｜ z/L ｜ satisfies the ＂-1/3＂power lawunder unstable conditions. Under the near-neutral condition,normalized standard deviations are approximately constant,they are significantly greater than those in other regions of the Qinghai-Tibetan Plateau. When the wind speed is 0 m ·s~（-1）U 3 m ·s~（-1）,the development of turbulence is much vigorous. The performance of the turbulence intensity in the three directions is I_u≈I_vI_w. The diurnal variations of surface fluxes are evident,and latent heat flux is larger than the sensible heat flux in the summer.