摘要
利用CMP11(含遮光环)、SPN1和RSR3 3种辐射测定仪器,于2012年3—6月在中国科学院千烟洲红壤丘陵试验站开展总辐射和散射辐射的平行对比观测.结果表明:不同辐射仪测定的总辐射和散射辐射都有很好的线性相关关系;相对于CMP11而言,SPN1和RSR3测定的总辐射分别低3.0%和20.5%;对于测定的散射辐射,SPN1和RSR3较CMP11的观测结果分别低5.5%和7.9%;在晴朗、多云、阴天3种天气条件下,各仪器测量的散射辐射日变化一致,并且在不同太阳高度角下观测的散射辐射结果相似.不同仪器测量的日尺度散射辐射随时间的累积存在一定差异,3、4、5月的月尺度散射分数分别为0.56、0.59和0.70.在我国南方中亚热带地区,散射辐射在太阳总辐射中占据了较大比例,并且随时间变化存在明显的变化特征.有必要对其开展长期连续测定,以准确把握其长期的动态变化特征.
Global radiation and diffuse radiation were measured from March to June of 2012 in Qianyanzhou Experimental Station of Red Soil and Hilly Land,Chinese Academy of Sciences by using three types of pyranometers,including CMP11 attached with a shadow ring,SPN1 and RSR3,which were placed in parallel. The observations showed that both global radiation and diffuse radiation measured by these pyranometers had a good linear correlation. The global radiation measured by SPN1 and RSR3 was respectively 3. 0% and 20. 5% lower than that measured by the CMP11. The diffuse radiation measured by SPN1 and RSR3 was respectively 5.5% and 7.9% lower of than that measured by the CMP11. Under the sunny,cloudy and overcast conditions,the daily variations of diffuse radiation measured by the three pyranometers were similar,and hence,the diffuse radiation values at a specific solar elevation angle measured by the different pyranometers were also similar. There was difference in daily accumulative diffuse radiation measured by the different pyranometers. Monthly diffuse fractions of March,April and May were 0. 56,0. 59 and 0. 70,respectively. In the subtropical area of southern China,the diffuse radiation accounted for a relatively large proportion of the global solar radiation and varied considerably over time. It is necessary to conduct long-term continuous measurements to capture the variability of diffuse radiation over different underlying surfaces.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第3期697-703,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(31170422)资助
关键词
总辐射
散射辐射
对比观测
晴空条件
散射分数
global radiation
diffuse radiation
comparative observation
clearness condition
diffuse fraction
