干旱区生态环境知识资源中心(Arid): Estimation of key surface parameters in semi-arid region and their impacts on improvement of surface fluxes simulation

Arid

	Estimation of key surface parameters in semi-arid region and their impacts on improvement of surface fluxes simulation
	Liu Ye; Guo Weidong; Song Yaoming
来源期刊	Science China. Earth Sciences
ISSN	1674-7313
出版年	2016
卷号	59 期号:2 页码:307-319
英文摘要	Uncertainties in some key parameters in land surface models severely restrict the improvement of model capacity for successful simulation of surface-atmosphere interaction. These key parameters are related to soil moisture and heat transfer and phy- sical processes in the vegetation canopy as well as other important aerodynamic processes. In the present study, measurements of surface-atmosphere interaction at two observation stations that are located in the typical semi-arid region of China, Tongyu Station in Jilin Province and Yuzhong Station in Gansu Province, are combined with the planetary boundary layer theory to estimate the value of two key aerodynamic parameters, i.e., surface roughness length z_(0m) and excess resistance kB~(-1). Multiple parameterization schemes have been used in the study to obtain values for surface roughness length and excess resistance kB~(-1) at the two stations. Results indicate that z0m has distinct seasonal and inter-annual variability. For the type of surface with low-height vegetation, there is a large difference between the default value of z_(0m) in the land surface model and that obtained from this study. kB~(-1) demonstrates a significant diurnal variation and seasonal variability. Using the modified scheme for the estimation of z0m and kB~(-1) in the land surface model, it is found that simulations of sensible heat flux over the semi-arid region have been greatly improved. These results suggest that it is necessary to further evaluate the default values of various parameters used in land surface models based on field measurements. The approach to combine field measurements with atmospheric boundary layer theory to retrieve realistic values for key parameters in land surface models presents a great potential in the improvement of modeling studies of surface-atmosphere interaction.
英文关键词	Semi-arid region Turbulent transfer Surface roughness length Excess resistance Field experiments
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:5628920
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335614
作者单位	Liu Ye, Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu 210093, China.; Guo Weidong, Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu 210093, China.; Song Yaoming, College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044, China.
推荐引用方式 GB/T 7714	Liu Ye,Guo Weidong,Song Yaoming. Estimation of key surface parameters in semi-arid region and their impacts on improvement of surface fluxes simulation[J],2016,59(2):307-319.
APA	Liu Ye,Guo Weidong,&Song Yaoming.(2016).Estimation of key surface parameters in semi-arid region and their impacts on improvement of surface fluxes simulation.Science China. Earth Sciences,59(2),307-319.
MLA	Liu Ye,et al."Estimation of key surface parameters in semi-arid region and their impacts on improvement of surface fluxes simulation".Science China. Earth Sciences 59.2(2016):307-319.