Seasonal Variation of Turbulence Characteristics over Alpine Meadow Ecosystem

CHEN Yungang; ZHANG Yu; WANG Shaoying; SHANG Lunyu; XIONG Jiansheng; SHEN Xiaoyan

doi:10.7522/j.issn.1000-0534.2014.00044

Plateau Meteorology >

2014 , Vol. 33 >Issue 3: 585 - 595

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00044

Seasonal Variation of Turbulence Characteristics over Alpine Meadow Ecosystem

CHEN Yungang ,
ZHANG Yu ,
WANG Shaoying ,
SHANG Lunyu ,
XIONG Jiansheng ,
SHEN Xiaoyan

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Key Laboratory of Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou 730000, China;2. University of Chinese Academy of Science, Beijing 100049, China

Received date: 2013-12-18

Online published: 2014-06-28

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Abstract

The relationships between normalized standard deviations of wind velocity components, temperature, water vapor, CO₂ and stability parameters z/L, and their seasonal variation characteristics in the frame of Monin-Obukhov similarity theory(MOST) were investigated. The turbulent data were collected from an homogeneous, flat and open grassland of the northeast edge of Qinghai-Xizang Plateau in 2010. The results show that normalized standard deviation of wind velocity components generally meet 1/3 power law. σ_u/v_*、 σ_v/u_* and σ_w/v_* increase along with the increase of |z/L|. Under near neutral condition(|z/L|<0.05), normalized standard deviations are approximate constant, and σ_u/u_*>σ_v/u_*>σ_w/u_*σ. The normalized standard deviation of the horizontal wind velocity decreases with increase of aerodynamic roughness Z_0m, and σ_w/u_* does not have obvious seasonal variation, which can be regarded as a constant on the whole. Under unstable conditions, the normalized standard deviations of temperature, water vapor and CO₂ in relation to z/L satisfy the similarity law, which decrease along with the increase of |z/L|. Under near neutral condition, σ_q/q_*>σ_c/C_*>σ_T/T_*. The seasonal variations of σ_T/T_*, σ_q/q_* and σ_c/C_* mainly depend on the seasonal change of characteristic scale T_*, q_* and C_*, which increase with the increase of turbulent fluxes. Compared with the latent heat and CO₂ flux, sensible heat flux has evidently reverse seasonal tendency, with minimal season variety and minimum value in summer. Accordingly, the extent of annual variation σ_T/T_* is relatively small and maximum value is in summer, while σ_q/q_* and σ_c/C_* have reverse seasonal tendency.

Key words： Normalized standard; Aerodynamic roughnes; Seasonal variation; Homogenous land surf

Cite this article

CHEN Yungang , ZHANG Yu , WANG Shaoying , SHANG Lunyu , XIONG Jiansheng , SHEN Xiaoyan . Seasonal Variation of Turbulence Characteristics over Alpine Meadow Ecosystem[J]. Plateau Meteorology, 2014 , 33(3) : 585 -595 . DOI: 10.7522/j.issn.1000-0534.2014.00044

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