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《Chinese Journal of Geophysics》 2013-08
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Characteristics of carbon dioxide,thermo-hydrological fluxes and atmospheric turbulence structure over Gobi Desert

ZHAO Zi-Long1,ZHANG Hong-Sheng1*,KANG Ling2 1 Laboratory of Climate and Ocean-Atmosphere Studies,Department of Atmospheric and Oceanic Sciences, School of Physics,Peking University,Beijing 100871,China 2 College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China  
Based on the turbulence data obtained from an atmospheric boundary layer station located in Gobi Desert in northwest China during the summer of 2006,the carbon dioxide fluxes,latent heat fluxes and sensible heat fluxes were investigated.The results showed that the carbon dioxide flux was transferred down to land surface in daytime but conversely at night,and the mean value of carbon dioxide flux was-0.199 mg·m-2·s-1,which indicated that the Gobi Desert was a carbon sink in summer.Since the value of the moisture content of the surface layer over the Gobi Desert was small,the specific humidity is almost passively controlled by horizontal moisture fluxes and its diurnal variation was unobvious.On the other hand,the statistical characteristic of the turbulent transport of temperature was in accordance with Monin-Obukhov Similarity theory.The normalized spectra of temperature were similar with that of the CO2 concentration(c).The normalized cospectra of u-wind component(u) and carbon dioxide(c) were similar with that of u and the potential temperature(θ).The normalized cospectra of the vertical wind component(w) and carbon dioxide(c) were similar with that of w and θ.The transport of humidity and CO2 depended on horizontal fluxes.
【Fund】: 国家自然科学基金(41075005);; 国家重点基础研究发展规划项目(2010CB428501);; 高等学校博士学科点专项科研基金资助课题(20110001130010);; 财政部/科技部公益性行业(气象)科研专项(GYHY201006014)资助
【CateGory Index】: P404
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