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《Plateau Meteorology》 2015-04
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Characteristics of Albedo over Different Underlying Surface in the Semi-Arid Area

ZHANG Chi;FAN Guangzhou;MA Zhuguo;CHENG Bingyan;ZHAO Tianbao;FENG Jinming;WANG Hesong;The Climatic Center of Chunking Meteorological Branch;Plateau Atmospheric and Environmental Research Key Laboratory of Sichuan Province,Chengdu University of Information Technology;Key Laboratory of Regional Climate - Environment for Temperate East Asia ( RCE - TEA) ,Institute of Atmospheric Physics,Chinese Academy of Sciences;  
Based on radiation- flux,regular meteorological data and simultaneously remote sensed MODIS EVI data,obtained from various underlying land-surface of nine Chinese semi-arid area stations from July to September in 2008 and 2009,the seasonal and diurnal mean albedo,the fit regression with precipitation and the oneweek continuous variations were characterized. The mutual effects among albedo,solar radiation and land-surface temperature in different weather conditions,including rain and snow,were deeply delved. The seasonal mean albedo over 4 types of underlying land-surface showthat the magnitude are decreased as following : desert grassland plateau grassland recessive grassland farmland,re-supporting the previous reports. The fit regression between the albedo and the precipitation on the plateau grassland,desert grassland and farmland are all significant( P- value 0. 05),but the recessive grassland is not available. The night rain scarcely effect the‘U'style distribution of the next day's diurnal albedo because the soil water cycling from latent heat or evaporation system attributed to the sensible heat on the desert grassland surface. While on the plateau grassland without snowcover,the albedo is mainly decided by the plant coverage per unit area and leaves property of plateau plant. The proper rainfall,lower shallowsoil temperature,land-surface air temperature and lower solar income radiation can make the albedo bigger on the snowcovered grassland. The newsnowand frozen soil might be the crisis for the albedo of highland grassland. For the recessive grassland,the diurnal ‘√'style distribution in a marked rainfall procedure will be more obvious,if mean albedo from 09: 00( Beijing Time,hereafter the same)- 11: 00 is much bigger due to more cloud scattering and the slowly increased albedo from 15: 00- 17: 00 mainly due to the fact that raising force of the lower solar motive angle is bigger than the decreasing effect of the increasing the shallowsoil water per column. In a diurnal ‘U 'style distribution of albedo on the farmland planted with corn,the mutual function between the solar motive angle and plant coverage per unit is conducive to the sudden increase of the mean albedo during 15: 00- 17: 00 in the rain day,and the shallowsoil water per column hardly contribute to the raised albedo at that time.
【Fund】: 国家重大科学研究计划项目(2012CB956201);; 科技部公益性行业(气象)专项(GYHY201106028);; 国家自然科学基金项目(41275085);; 重庆气象局业务技术攻关重点(团队)项目(ywgg-201508)
【CateGory Index】: P422.15
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