Characteristics of Diffuse Radiation at Hinterland of the Taklimakan Desert
In this paper,the characteristics of diffuse radiation (Rd) and its relationship with clearness index and air quality were analyzed by using global radiation,diffuse radiation and direct radiation data which was observed at the Desert Atmosphere and Environment Observation Experiment Station of the Taklimakan Desert in 2010.The results show that the total annual diffuse radiation is 3628 MJ · m-2,accounting for 59.5 ％ of the total radiation,and it is higher than the national average.The diffuse radiation is strong in summer (468.3 MJ· m-2) and weak in winter (120 MJ·m-2).The peak value of diffuse radiation appears at noon and instantaneous maximum irradiation intensity reach to 719.2 W· m-2 in summer.Compared with clearness index more than 0.7,the diffuse radiation increases in autumn and winter when clearness index is less than 0.7.The ratio of diffuse radiation to global radiation decreases linearly with the increase of clearness index when clearness index is greater than 0.3,while,the ratio of diffuse radiation to extraterrestrial solar radiation linearly with the increase of clearness index when clearness index is less than 0.3.The diffuse radiation decreases exponentially with the increase of solar elevation.In addition,the change of diffuse solar radiation concentrates at the range of air quality less than 5,and it reduces rapidly with the increase of air quality.
NETL
NSTL
万方数据
维普
