Comparison of Four Methods for Calculating Surface Fluxeson Alpine Grassland at Naqu

YAN Xiaoqiang; HU Zeyong; SUN Genhou; XIE Zhipeng

doi:10.7522/j.issn.1000-0534.2017.00067

Plateau Meteorology >

2018 , Vol. 37 >Issue 2: 358 - 370

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00067

Comparison of Four Methods for Calculating Surface Fluxeson Alpine Grassland at Naqu

YAN Xiaoqiang ,
HU Zeyong ,
SUN Genhou ,
XIE Zhipeng

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Key Laboratory for land process and climate change in cold and Arid Regions, Northwest Institute of Ecological and Environmental Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;University of Chinese Academy of Sciences, Beijing 100049, China;Center for Excellence in Tibetan Plateau Earth Science, Chinese Academy of Science, Beijing 100101, China

Received date: 2017-07-12

Online published: 2018-04-28

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Abstract

The near-surface layer gradients observed data of wind speed, temperature and specific humidity combined with the radiative and soil heat fluxes have been widely applied in estimating the surface-air turbulent exchange over decades. However, different methods may produce significant differences and errors in their results. In this paper, the observational data of automatic weather station (AWS) and eddy correlation system (EC) from Naqu Station of Plateau Climate and Environment in the Norther Tibetan Plateau from September 2013 to August 2014 were used to calculate turbulent fluxes by the eddy covariance, the aerodynamic method, the combination methodand the mass transfer method and analysis the consistency and difference among the calculated results. The results show that the characteristics of turbulent fluxes calculated by different methods have obvious differences. The combination method satisfies the energy balance relationship. However, the turbulent fluxes appear to be abnormally unstable during the morning and evening. The turbulent fluxes calculated by the aerodynamic method have the highest correlation with the turbulent fluxes calculated by the eddy correlation method. But when the atmospheric stability parameter is close to zero, the calculation result is unstable. When the difference between the surface temperature and the air temperature is less than zero, the flux data calculated by the mass transfer method show obvious divergence. But this method is simple in principle and suitable for field stations which have few observation instruments and incomplete meteorological observation stations. The mean deviation of the turbulent flux calculated by the aerodynamic method and the combination method is smaller, while the average deviation of the turbulent flux calculated by the mass transfer method is larger. The results of this study provide reference for the use of these methods. Besides, the results of this study provide a reasonable basis for the establishment of long time flux series. Finally this study will help us to understand the interaction between the surface and the atmosphere.

Key words： Qinghai-Tibetan Plat; alpine meadow; turbulent flux; calculation method; difference

Cite this article

YAN Xiaoqiang , HU Zeyong , SUN Genhou , XIE Zhipeng . Comparison of Four Methods for Calculating Surface Fluxeson Alpine Grassland at Naqu[J]. Plateau Meteorology, 2018 , 37(2) : 358 -370 . DOI: 10.7522/j.issn.1000-0534.2017.00067

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