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An overview of the spatial patterns of land surface processes over arid and semiarid regions
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Citation of this paper:Jian Zeng,Jie Shen,Qiang Zhang,2010.An overview of the spatial patterns of land surface processes over arid and semiarid regions.Sciences in Cold and Arid Regions,2(4):0288~0297.
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Author NameAffiliationE-mail
Jian Zeng 1. Institute of Arid Meteorology, China Meteorological Administration (CMA); Key laboratory of Arid Climatic Change and Re-ducing Disaster of Gansu Province; Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Lanzhou, Gansu 730020, China 2. Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, China libiecho@163.com 
Jie Shen 1. Institute of Arid Meteorology, China Meteorological Administration (CMA); Key laboratory of Arid Climatic Change and Re-ducing Disaster of Gansu Province; Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Lanzhou, Gansu 730020, China 2. College of Atmospheric Sciences, Lanzhou University, Lanzhou, Gansu 730000, China  
Qiang Zhang 1. Institute of Arid Meteorology, China Meteorological Administration (CMA); Key laboratory of Arid Climatic Change and Re-ducing Disaster of Gansu Province; Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Lanzhou, Gansu 730020, China 2. Meteorological Bureau of Gansu, Lanzhou, Gansu 730020, China 3. Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, China 4. College of Atmospheric Sciences, Lanzhou University, Lanzhou, Gansu 730000, China  
 
Abstract:With data from the project Collaborative Observation of Semi-arid/Arid Regions in North China, collected during July and September 2008, the spatial patterns of land surface processes over arid and semiarid regions have been investigated based on the ordinary Kriging interpolation approach. Generally, for the radiation processes, downward and upward short-wave radiation have a uniformly increasing trend with latitude, but the spatial patterns of long-wave radiation present notable regional differences: both upward and downward long-wave radiation increase with latitude in the west of North China, while in the east they vary inversely with latitude, suggesting surface temperature and clouds respectively have feedbacks to the long-wave radiation in the west and east of North China. The surface net radiation basically has a negative latitudinal trend. Long-wave radiation budget plays an important role in the spatial pattern of surface net radiation, particularly in the east of North China, although short-wave radiation budget largely determines the magnitude of surface net radiation. For the energy processes, latent and sensible heat flux varies conversely with latitude: more available land surface energy is consumed by evaporating soil water at lower latitudes while more is used for heating the atmosphere at higher latitudes. A soil heat flux maximum and minimum are found in Loess Plateau and Qinghai Plateau respectively, and a maximum is seen in the northeast China.
keywords:land surface radiation processes  land surface energy processes  spatial pattern  arid and semiarid regions
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