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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (1): 174-178    DOI: 10.7522/j.issn.1000-694X.2013.00025
Weather and Climate     
Calculation of Roughness Length of Desert and Its Application in Land Surface Process Model
CHEN Shi-qiang, LV Shi-hua
Gansu Key Laboratory of Arid Climate Change and Reducing Disaster, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract  

Using the data from the third phase of "The Oasis System Energy and Water Cycle Field Experiment" in 2005, we calculated the aerodynamic and thermal roughness lengths of desert surface in Jinta Oasis area. The aerodynamic roughness lengths of sandy desert and gobi in Jinta Oasis area were 1.81×10-3 m and 1.64×10-3 m respectively, and they were similar to the calculation results from the HEIFE experiment in Heihe River basin: the aerodynamic roughness length of sandy desert was bigger than that of Gobi. The thermal roughness lengths of sandy desert and gobi in Jinta Oasis area were 0.28×10-3m and 0.62×10-3 m, respectively. When the roughness length data were replaced into the Noah land surface process model coupled in MM5 and WRF models, the simulation results of surface temperature and sensible heat flux in sandy desert and gobi were quite consistent with the observation results. The simulation capability of surface temperature and sensible heat flux in desert area could be improved a lot using the aerodynamic and thermal roughness length data. This would be favorable to the application of the Noah model to the oasis system study.

Key words:  roughness length      land surface temperature      sensible heat flux      desert surface     
Received:  09 March 2012      Published:  20 January 2013
ZTFLH:  P404  
Articles by authors
CHEN Shi-qiang
LV Shi-hua

Cite this article: 

CHEN Shi-qiang, LV Shi-hua. Calculation of Roughness Length of Desert and Its Application in Land Surface Process Model. JOURNAL OF DESERT RESEARCH, 2013, 33(1): 174-178.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00025     OR     http://www.desert.ac.cn/EN/Y2013/V33/I1/174

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