绿洲边缘夏季晴天辐射平衡特征和地表能量研究  

STUDY ON RADIATION BALANCE AND SURFACE ENERGY IN OASIS RIM

作　　者：王超[1,2] 韦志刚[1,3] 李振朝[1] 候旭宏[1] 刘慧[1] 魏红[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,寒旱区陆面过程与气候变化重点实验室,兰州730000 [2]成都信息工程学院,成都610225 [3]北京师范大学全球变化与地球系统科学研究院地表过程与资源生态国家重点实验室,北京100875

出　　处：《太阳能学报》2012年第11期1944-1950,共7页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(2009CB421402);国家自然科学基金(40730952);中国科学院知识创新工程重要方向项目(KZCX2-YW-220)

摘　　要：利用2009年敦煌绿洲边缘稀疏植被下垫面夏季观测资料,从中选取5d资料完整的连续晴好天气,系统分析西北干旱区下垫面夏季典型晴天的地表辐射收支和能量平衡的特征。结果表明:该地区总辐射较大,高于同期华南湿润地区,但低于青藏高原北部,利用加权平均的方法计算出地表反照率平均值为0.234;净辐射与感热和潜热有良好的线性关系,且通过了99%置信度检验,感热比潜热能量输送显著得多,平均波文比为3.08;浅层土壤温度变化剧烈,日变化明显,7.5cm的土壤热导率为0.26W/(m.K),平均土壤容积热容量为0.88×106J/(m3.K);在平衡方程中,土壤热储量不能忽视,在考虑土壤热储量后,该地区白天的能量闭合度平均值为0.91。Utilizing the data observed over the Sparse vegetation in Intensive Observation Experiment Period （ July to September in 2009） in Dunhuang. The five fine days with continuous and integrated data were selected, and then their characteristics of daily variations of the surface radiation budget, heat budget, and the microclimate were analyzed. The results showed that the solar radiation in this region larger than southern humid areas, but lower than the northern Tibetan Plateau and the weight mean ground surface albedo is 0. 234 ; there was good linear correlation between sensible heat, and net surface radiation, and the correlation coefficient reached the testing of degree of 99% confidence; sensible heat is the main form of surface energy loss and the average value of Bowen ratio is 3.08; the shallow soil temperature variation was dramatic and diurnal variation was significant. The values of 7.5cm soil thermal conductivity over spare vegetation was 0.26W/（ m·K）, and the soil heat capacity is 0.88×106J/（ m3·K）. Soil thermal reserves should not be ignored in energy balance closure, and the mean energy closure is 0.91.

关 键 词：绿洲边缘 地表参数 辐射平衡 能量平衡 

分 类 号：P422.4[天文地球—大气科学及气象学]