Vol.23, NO.5, 2012
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Article Navigation >  Journal of Applied Meteorological Science  > 2012  >  23(5): 585-592
Yang Yun, Ding Lei, Cheng Xinghong, et al. Thermal offset correction methods for sensitivity of PSP pyranometer. J Appl Meteor Sci, 2012, 23(5): 585-592.
Citation: Yang Yun, Ding Lei, Cheng Xinghong, et al. Thermal offset correction methods for sensitivity of PSP pyranometer. J Appl Meteor Sci, 2012, 23(5): 585-592.
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Thermal Offset Correction Methods for Sensitivity of PSP Pyranometer

  • 1.

    Meteorological Observation Center, CMA, Beijing 100081

  • 2.

    Public Weather Service Center, CMA, Beijing 100081

  • 3.

    Nanjing University of Information Science & Technology, Nanjing 210044

  • Received Date: 2012-01-25
  • Rev Recd Date: 2012-06-21
  • Publish Date: 2012-10-31
    Abstract
  • 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 nighttime thermal offsets within the pyranometers demonstrates near normal distribution. The offset of PSP type pyranometers 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 calibration is done underclear sky. The negative thermal offset of the pyranometer causes that the sensitivity is underestimated. 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 sensitivity 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 reference 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 equation 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 directly. 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 using the sum composition method to calibrate PSP pyranometer, the correction results of the net longwave sensitivity method is better than other methods. The result of the cover method is more close to the net longwave sensitivity method, the correction effects using the night voltage output method is not good. Drawing the daytime offset curves separately using the five offset correction methods, the net longwave equation method and the net longwave sensitivity method is more close to the reference value. But these methods are only confined to the shaded pyranometers, because shading makes pyranometer performs more like in the night. For unshading pyranometers, because of the effects of direct irradiance, the five correction methods are distinctly different with the true value. When using CMP22 and 8-48 pyranometers with shading in the sum composition method to test the reference diffused irradiance, the thermal offset could be ignored. But the CMP22 or 8-48 pyranometer should be calibrated by "shade/unshade" method to reduce the effects of offset for sensitivity.When the net longwave sensitivity method or the cover method is used in the sum composition method, the accuracy of PSP's sensitivity could be improved 1%.
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    References(19)

  • Fig. 1  Difference between measurement of pyranometer and reference global irradiance

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    Fig. 2  Thermal offset equation at night on 16 Oct 2011

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    Fig. 3  Daytime thermal offset curves calculating from thermal offset equation at night

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    Fig. 4  PSP pyranometer zero offset curve at night

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    Fig. 5  Daytime thermal offset curves of unshaded PSP pyranometer using five methods

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    Fig. 6  Daytime thermal offset curves of shaded PSP pyranometer using five methods

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    Table  1  Thermal offset comparison of pyranometer from various methods (unit:W·m-2)

    表号 型号 方法1 方法2 方法3 方法4 方法5
    20462F3 PSP -7.4 -10.5 -4.8 -3.3
    20463F3 PSP -7.8 -14.3 -4.3 -3.0
    33734F3 PSP -5.4 -11.6 -6.7 -8.1 -2.7
    33779 8-48 -1.4 3.3 -0.3
    060016 CMP22 -0.2 -2.2 -1.2
    100180 CMP22 -2.1 -1.0 -1.0
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    Table  2  Comparison of shade/unshade method to sum composition method corrected by RNET

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    20462 PSP 10.07 10.15 10.21 -1.4 -0.6
    20463 PSP 9.50 9.58 9.68 -1.9 -1.0
    33734 PSP 7.89 7.98 8.07 -2.2 -1.1
    注：RUCS为未修正的成分和法得到的灵敏度；RCCS为热偏移修正后的成分和法得到的灵敏度；RSU为“遮/不遮”法得到的灵敏度。下同。
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    Table  3  Comparison of 33734F3 sensitivity using three methods

    时间 太阳天
    顶角/(°)    		 净热辐射
    /(W·m-2)    		 RUCS/
    (μV·W-1·m2)    		 RCCS/
    (μV·W-1·m2)    		 RSU/
    (μV·W-1·m2)    		 百分比误差/%
    RUCS RCCS
    11:27:32 58.6 -137.8 7.77 7.91 7.97 -2.5 -0.8
    11:33:32 58.5 -134.5 7.78 7.91 7.97 -2.4 -0.7
    11:39:32 58.4 -135.2 7.79 7.92 7.98 -2.3 -0.7
    11:45:32 58.3 -135.3 7.79 7.92 7.98 -2.4 -0.7
    11:51:32 58.3 -136.5 7.79 7.92 7.98 -2.4 -0.7
    11:57:32 58.3 -135.6 7.77 7.91 7.98 -2.6 -0.9
    12:03:32 58.3 -136.2 7.78 7.92 8.00 -2.7 -1.0
    12:09:32 58.3 -137.0 7.77 7.90 7.98 -2.7 -1.0
    12:15:32 58.4 -136.2 7.76 7.90 8.00 -2.9 -1.2
    12:21:32 58.6 -136.0 7.76 7.89 7.99 -2.9 -1.2
    12:27:32 58.7 -136.2 7.76 7.89 8.00 -3.0 -1.3
    12:33:32 58.9 -139.3 7.77 7.91 8.00 -2.8 -1.1
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    Table  4  Comparison of shade/unshade method to sum composition method corrected by ENIR equation

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    20462 PSP 10.07 10.14 10.21 -1.4 -0.7
    20463 PSP 9.50 9.56 9.68 -1.9 -1.3
    33734 PSP 7.89 7.94 8.07 -2.2 -1.6
    36176 8-48 9.54 9.55 9.58 -0.5 -0.3
    100180 CMP22 9.34 9.37 9.38 -0.4 -0.1
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    Table  5  Comparison of shade/unshade method to sum composition method corrected by cap-offset

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    33734 PSP 7.89 7.98 8.07 -2.2 -1.2
    100180 CMP22 9.34 9.36 9.38 -0.4 -0.2
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    Table  6  Comparison of shade/unshade method to sum composition method corrected by average of zero offset at night

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    20462 PSP 10.07 10.10 10.21 -1.4 -1.1
    20463 PSP 9.50 9.52 9.68 -1.9 -1.7
    33734 PSP 7.89 7.91 8.07 -2.2 -2.0
    36176 8-48 9.54 9.53 9.58 -0.5 -0.5
    100180 CMP22 9.34 9.35 9.38 -0.4 -0.3
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  • [1]
    郑有飞, 关福来, 蔡子颖, 等.我国南方中东部地区地面太阳总辐射变化规律.应用气象学报, 2011, 22(3):312-320. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20110307&flag=1
    [2]
    李晓文, 李维亮, 周秀骥.中国近30年太阳辐射状况研究.应用气象学报, 1998, 9(1):24-31. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19980104&flag=1
    [3]
    杨羡敏, 曾燕, 邱新法, 等.1960—2000年黄河流域太阳总辐射气候变化规律研究.应用气象学报, 2005, 16(2):243-248. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20050230&flag=1
    [4]
    张家诚.评《太阳辐射能的测量与标准》.气象科学研究院院刊, 1989, 4(2):224. http://www.cnki.com.cn/Article/CJFDTOTAL-YYQX198902016.htm
    [5]
    邱金桓, 许潇锋, 杨景梅.北京等7个气象台站太阳总辐射观测资料的准确度评估.应用气象学报, 2008, 19(3):287-296. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20080348&flag=1
    [6]
    世界气象组织. 气象仪器和观测方法指南 (第6版). WMO-No. 8, 1996.
    [7]
    ISO9060-1990.Solar Energy-Specification and Classification of Instrument for Measuring Hemispherical Solar and Direct Solar Radiation.1990.
    [8]
    Rolf Philipona. Underestimation of solar global and diffuse radiation measured at Earth's surface. J Geophys Res, 2002, 107, D22, 4654, doi: 10.1029/2002JD002396, 2002.
    [9]
    杨云, 丁蕾, 王冬.总日射表夜间零点偏移试验与分析.气象, 2010, 36(11):100-103. doi:  10.7519/j.issn.1000-0526.2010.11.015
    [10]
    Standard Test Method for Calibrition of a Pryranometer Using a Pyrheliometer. ASTM G167-05. 2010.
    [11]
    Ibrahim R, Stoffel T, Daryl M. A method to calibrate a solar pyranometer for measuring reference diffuse irradiance. Solar Energy, 2003, 74:103-112. doi:  10.1016/S0038-092X(03)00124-5
    [12]
    Michalsky J J, Gueymard C, Kiedron P, et al. A proposed working standard for the measurement of diffuse horizontal shortwave irradiance. J Geophys Res, 2007, 112, D16112, doi: 10.1029/2007JD008651.
    [13]
    Reda I, Hickey J, Long C, et al.Uing a blackbody to calculate net longwave responsivity of shortwave solar pyranometers to correct for their thermal offset error during outdoor calibration uing the component sun method. American Meteorological Socicty, 2005, 22(10):1531-1540. doi:  10.1175/JTECH1782.1
    [14]
    王炳忠, 莫月琴, 杨云.现代气象辐射测量技术.北京:气象出版社, 2008. http://www.cnki.com.cn/Article/CJFDTOTAL-SYQY201603027.htm
    [15]
    权维俊, 陈洪滨, 高燕虎, 等.上甸子大气本底站太阳辐射观测数据的质量评价.高原气象, 2009, 28(1):136-142. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200901017.htm
    [16]
    杨云, 王冬, 吕文华.我国太阳辐射标准与量值传递.仪器仪表学报, 2007, 28(增刊Ⅳ):429-435. http://youxian.cnki.com.cn/yxdetail.aspx?filename=QXKJ201702001&dbname=CJFDPREP
    [17]
    Dutton E G, Michalsky J J, Stoffel T, et al. Measurement of broadband diffuse Solar irradiance using current commercial instrumention with a correction for thermal offset errors. J Atmos Ocean Technol, 2001, 18(3):297-314. doi:  10.1175/1520-0426(2001)018<0297:MOBDSI>2.0.CO;2
    [18]
    程兴宏, 张小玲, 郑向东, 等. PSP总日射表热偏移特征及其测量总辐射误差分析.太阳能学报, 2009, 30(1):19-26. http://www.cnki.com.cn/Article/CJFDTOTAL-TYLX200901006.htm
    [19]
    世界气象组织. International Pyrheliometer Comparison. IOM Report, WMO/TD, 27, 2010.
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    • Received : 2012-01-25
    • Accepted : 2012-06-21
    • Published : 2012-10-31
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