A Preliminary Study on Land-Surface Albedo in Northern Tibetan Plateau
LI Ying;HU Ze-yong
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Graduate School of Chinese Academy of Sciences, Beijing 100039, China;2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
Based on the observed data at Automatic Weather Stations(AWS) including D105,Amdo,MS3478 and BJ in northern Tibetan Plateau during the experimental period of CEOP/CAMP-Tibet(Coordinated Enhanced Observing Period(CEOP) Asia-Australia Monsoon Project(CAMP) on the Tibetan Plateau),the temporal variation and spatial distribution characteristics of surface albedo in this area are analyzed.The results indicate that the surface albedo in this area has obvious diurnal,monthly and seasonal variation characteristics.The diurnal variation curves in winter and spring present marked saddle shapes,and the change of curves shape is not obvious in summer and autumn.The monthly average albedos from June to September are the lowest in the whole year,and the albedo fluctuation in May is obvious.As to the seasonal average values,those in winter are the hightest,the second in spring,the third in autumn,and the lowest in summer.The average value in the region is 0.2457.The spatial distribution of albedo is also not homogeneous.Both the values and the shapes of curves are dissimilar in different stations.It relates to the geographical position of observation station,but weather condition and underlying surface situation are also very important.