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Calibration and Error Analysis for Multi-wavelength Sun-Photometer Observations

GAO Ling1, ZHAO Chunlei2, LI Chengcai1, REN Tong1, LI Qian1   

  1. 1. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871; 2. Institute forMeteorological Research of HeBei Province, Shijiazhuang, 050021;
  • Received:2010-11-30 Online:2011-11-20 Published:2011-11-20



  1. 1. 北京大学物理学院大气与海洋科学系, 北京 100871; 2. 河北省气象科学研究所, 石家庄 050021;

Abstract: The theory of Langley method was used to calibrate the four multi-wavelength MICROTOPS Ⅱ sun-photometers at Lingshou in Hebei Province, and good calibration results were obtained by using least square method. Then error analysis was taken from instrument viewing angle, filter bandwidth, weather condition, gas absorption etc. The modified Langley method was adopted to the water vapor channel (936 nm). Finally, calibration results of five channels were calculated for each instrument. In order to verify the effectiveness of the calibration, the calibrated sun-photometers were used to observe the aerosol optical thickness (AOT) at Wuqing in Tianjin and Shijiazhuang in Hebei Province. The result shows that the relative errors are no larger than 1%, which indicts a successful calibration.

Key words: multi-wavelength sun-photometer, calibration, Langley plots, aerosol optical thickness

摘要: 根据Langley法定标的原理, 在河北省灵寿县对4台多波段太阳光度计MICROTOPSⅡ进行定标, 并采用最小二乘法得到了很好的定标结果。分别计算了仪器的视场角、通道的半波宽度、大气状况以及气体吸收等方面对定标结果造成的影响, 并且对水汽吸收通道(936 nm)采用修正的Langley法定标, 得到4台仪器各自5个通道的定标系数。将定标后的仪器在天津武清和河北石家庄进行了观测, 每两台仪器测得的气溶胶光学厚度(AOT)相对误差在1%左右, 说明此次利用Langley法定标的结果很好。

关键词: 多波段太阳光度计, 定标, Langley法, 气溶胶光学厚度

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