Structures And Turbulent Fluxes Of Atmospheric Boundary Layer Over Heterogeneous Surface

Land surface always presents various heterogeneities, which impacts the atmospheric boundary layer (ABL) structure and the exchange of energy and substance between the earth and the atmosphere, even impacts the regional climate. In this thesis, the data from Baiyangdian Experiments and the IAP meteorological tower have been used to study the structure and the turbulent fluxes of the ABL over heterogeneous surface. The eventual purpose of this thesis is to provide a scientific reference for the reasonable parameterization of the structure and the turbulent fluxes of the ABL over heterogeneous surface, and for the weather and climate numerical model dealing with the process of ABL. The main contents and results are as follows:(1) Structures of ABL over water-land heterogeneous surface. The results show that the structure of ABL over water is more complex than that over land as a whole, which presents multi-center and multi-layer. In unstable condition, the top of the convective boundary layer over water is slightly higher than that over land, but the specific humidity near land surface is larger than that near water surface at times. In November, even in the most unstable condition, there is a temperature inverse stratification near the water surface. In stable condition, the differences between the ABL structures over water and land are mainly in the low level, and the specific humidity near the water surface is larger than that near land surface. In the low level, the specific humidity near the water surface decreases with the height much more than that near land surface, whereas over the land, there is always a minimum specific humidity zone at the height of 40-60m.