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Relationships Between Surface Albedo,Soil Thermal Parameters and Soil Moisture in the Semi-arid Area of Tongyu,Northeastern China
作者姓名:刘辉志  王宝民  符淙斌
作者单位:State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Department of Atmospheric Sciences,Sun Yat-sen University,Key Laboratory of Regional Climate-Environment Research for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences
基金项目:国家重点基础研究发展计划(973计划)
摘    要:Continuous observation data collected over the whole year of 2004 on a cropland surtace m Tongyu, a senti-arid area of northeastern China (44°25'N, 122°52'E), have been used to investigate the variations of surface albedo and soil thermal parameters, including heat capacity, thermal conductivity and thermal diffusivity, and their relationships to soil moisture. The diurnal variation of surface albedo appears as a U shape curve on sunny days. Surface albedo decreases with the increase of solar elevation angle, and it tends to be a constant when solar elevation angle is larger than 40°. So the daily average surface albedo was computed using the data when solar elevation angle is larger than 40° Mean daily surface albedo is found to decrease with the increase of soil moisture, showing an exponential dependence on soil moisture. The variations of soil heat capacity are small during Julian days 90 300. Compared with the heat capacity, soil thermal conductivity has very gentle variations during this period, but the soil thermal diffusivity has wide variations during the same period. The soil thermal conductivity is found to increase as a power function of soil moisture. The soil thermal diffusivity increases firstly and then decreases with the increase of soil moisture.

关 键 词:表面反照率  土壤热量  传导率  扩散率  土壤湿气

Relationships between surface albedo,soil thermal parameters and soil moisture in the semi-arid area of Tongyu,northeastern China
Huizhi?Liu,Baomin?Wang,Congbin?Fu.Relationships Between Surface Albedo,Soil Thermal Parameters and Soil Moisture in the Semi-arid Area of Tongyu,Northeastern China[J].Advances in Atmospheric Sciences,2008,25(5):757-764.
Authors:Huizhi Liu  Baomin Wang  Congbin Fu
Affiliation:[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]Department of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275 [3]Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
Abstract:Continuous observation data collected over the whole year of 2004 on a cropland surface in Tongyu, asemi-arid area of northeastern China(44°25'N,122°52'E),have been used to investigate the variations of surface albedo and soil thermal parameters,including heat capacity,thermal conductivity and thermal diffusivity.and their relationships to soil moisture.The diurnal variation of surface albedo appears as a U shape curve on sunny days.Surface albedo decreases with the increase of solar elevation angle,and it tends to be a constant when solar elevation angle is larger than 40°.So the daily average surface albedo Was computed using the data when solar elevation angle is larger than 40°.Mean daily surface albcdo is found to decrease with the increase of soil moisture,showing an exponential dependence on soil moisture.The variations of soil heat capacity are small during Julian days 90-300.Compared with the heat capacity,soil thermal conductivity has very gentle variations during this period,but the soil thermal diffusivity has wide variations during the same period.The soil thermal conductivity is found to increase as a power function of soil moisture.The soil thermal diffusivity increases firstly and then decreases with the increase of soil moisture.
Keywords:surface albedo  soil heat capacity  soil thermal conductivity  soil thermal diffusivity  soil mois-ture
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