PSP总日射表灵敏度系数的热偏移订正方法  

Thermal Offset Correction Methods for Sensitivity of PSP Pyranometer

作　　者：杨云[1] 丁蕾[1] 程兴宏[2] 权继梅[1] 彭继达[3] 

机构地区：[1]中国气象局气象探测中心,北京100081 [2]中国气象局公共气象服务中心,北京100081 [3]南京信息工程大学,南京210044

出　　处：《应用气象学报》2012年第5期585-592,共8页Journal of Applied Meteorological Science

基　　金：国家自然科学基金青年基金项目(40905071)

摘　　要：PSP总日射表在我国一直作为标准总日射表和质量优良的辐射仪器在使用,2006年以前还曾作为国家散射标准,在太阳辐射量值传递中测量标准散射辐射,通过成分和法计算标准总日射辐照度。总日射表的校准在晴天条件下进行,此时天空无云,由于热偏移为负值,导致对短波灵敏度系数被低估。2011年10月14日—11月15日在北京密云上甸子大气本底站进行了对比观测试验,通过对不同总日射表热偏移订正方法的试验与研究,进行了5种热偏移订正方法的比较。通过订正,在用于室外成分和法校准时,PSP表的灵敏度系数的准确度可提高1%,进而提高总辐射的测量准确度。The PSP pyranometer is used as a reference pyranometer and a reliable in strument in China. Before 2006 it is once used as national diffused reference to measure the reference diffused irradiance, the value of which is used in the sum composition method to calculate the reference global irradiance. The probability distribution of the night time thermal offsets within the pyranometers demonstrates near normal distribution. The offset of PSP type pyran- ometers is larger than that of 8-48 and CMP22 type. Finding the characteristics of the offset within different types of pyranometers and doing the calibration will improve the accuracy of diffused irradiance. The pyranometer cali- bration is done underclear sky. The negative thermal offset of the pyranometer causes that the sensitivity is under- estimated. By the experiment and study on the thermal offset correction method for different type pyranometer, five correction methods are compared. The net longwave sensitivity method： Calculating the net longwave sensitiv ity of the pyranometer using longwave blackbody radiation, which is used in the sum composition method outdoors to correct the thermal offset of the pyranometer to reduce the offset effects. The differential algorithm with the ref- erence global irradiance.. Comparing it with the reference value derived from the sum composition method using the absolute cavity radiometer and CMP22 type secondary standard pyranometer with shading. The net longwave equa- tion method. Analyzing the data of pyranometers and PIR type pyrgeometers measured at night to correct thermal offset. The cover method： Covering the dome of pyranometers in daytime to measure the offset of pyranometer di- rectly. Using the voltage output of pyranometer in the nighttime as the thermal offset. Calculating the average voltage （night） when solar is 7~ lower than horizon and transform it to irradiance as the thermal offset. When u- sing the sum composition method to calibrate PSP pyranometer, the correction results of the net longwave s

关 键 词：总日射表 热偏移 订正方法 

分 类 号：P412.14[天文地球—大气科学及气象学]