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《Journal of Glaciology and Geocryology》 2006-02
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Ground Energy Balance and Microclimate Characteristics in the Oasis of Lower Reaches of Heihe River

ZHANG Yan-wu~1, FENG Qi~1, HUANG Jing~2, SI Jian-hua~1,ZHANG Xiao-you~1, SU Yong-hong~1(1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;2.College of Atmospheric Sciences,Lanzhou University,Lanzhou Gansu 730000,China)  
Using the meteorological data in Ejin Oasis from May to October 2005,the ground energy balance and microclimate characteristics have been analyzed.The results showed that global radiation,photosynthesis availability radiation(PAR) and net radiation had pronounced seasonal and daily variations in the oasis,and the maximum daily peak value and maximum month integral values appeared in July.The seasonal variation of the ground energy balance was obvious.In May,August,September and October,the sensible heat flux was the major portion in the ground energy exchange,and the Bowen Ratio was greater than 4 on day time;in June and July,the latent heat flux was the major portion in energy balance,and the Bowen Ratio was less than 1 on day time.Soil heat flux was always relatively small from May to October;about 15% to 20% of the net radiation.Wind velocity in the surface layer changed between 0 and 5 m·s~-1,and the variation of wind velocity was small in night and relatively large in daytime.The change of soil temperature decreased with soil depth increasing.Daily variation of soil temperature was large at the earth surface and slight at 40 cm depth.
【Fund】: 中国科学院“引进杰出人才”项目(2003401);; 国家自然科学基金项目(40405021);; 中国科学院知识创新工程项目(KZCX1-10-06)资助
【CateGory Index】: P463.2
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