Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 13 7 2009 10.5194/hess-13-987-2009 http://www.hydrol-earth-syst-sci.net/13/987/2009/ http://www.hydrol-earth-syst-sci.net/13/987/2009/hess-13-987-2009.html http://www.hydrol-earth-syst-sci.net/13/987/2009/hess-13-987-2009.pdf 987 998 2009-07-07 Seasonal and diurnal variations in moisture, heat and CO₂ fluxes over a typical steppe prairie in Inner Mongolia, China Z. Gao D. H. Lenschow lenschow@ncar.edu Z. He M. Zhou State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, CAS, Beijing, China National Center for Atmospheric Research (NCAR), Boulder CO, USA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China In order to examine energy partitioning and CO₂ exchange over a steppe prairie in Inner Mongolia, China, fluxes of moisture, heat and CO₂ in the surface layer from June 2007 through June 2008 were calculated using the eddy covariance method. The study site was homogenous and approximately 1500 m×1500 m in size. Seasonal and diurnal variations in radiation components, energy components and CO₂ fluxes are examined. Results show that all four radiation components changed seasonally, resulting in a seasonal variation in net radiation. The radiation components also changed diurnally. 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