Characteristics of Energy Transfer and Micrometeorology in Surface Layer in Different Areas of Tibetan Plateau in Summer

Based on the meteorological data acquired in Litang,Linzhi,Haibei and Lhasa in July 2009,the characteristics of the micrometeorology elements and radiation budgets and turbulent fluxes in different areas of the Tibetan Plateau are analyzed.Results show that: the averaged diurnal cycle of meteorology elements,radiation and turbulent fluxes in the surface layer in July are obvious,on the platform and in the canyon,in the central,eastern and northern parts of the Tibetan Plateau.The maximum and minimum values of averaged variations of radiation,latent heat flux,sensible heat flux etc.were observed in the afternoon and at sunrise respectively in all the areas.The surface albedo showed the variations of the U type in daytime.Intensity of surface heat was analyzed to be a heat source in daytime,while it's analyzed to be both a weak heat source and heat sink at night in all of the areas.The latent heat transfer played a dominant role in the heat transfer between the atmosphere and the land surface in July,while the sensible heat transfer was small.The values of momentum flux and friction velocity were higher in the windy afternoon than in the calm morning.