通过Li-7500分析仪对小型化大气CO2探测系统进行标定和误差分析。首先, 依据4天的测量数据标定CO2体积比浓度, 系统采集的吸收度与Li-7500 CO2分析仪测量的CO2体积比浓度满足线性关系, 得到的CO2体积比浓度标定系数一致性较好; 其次, 利用平均后的数据对系统标定, 反演得到的CO2体积比浓度相对误差绝对值小于2.0%, 与Li-7500 CO2分析仪数据相关性系数大于0.9, 充分表明了系统的稳定性和可靠性; 最后, 根据温度变化对大气传输效应的影响, 分析了合肥市科学岛近地面CO2的昼夜变化特征, 结果表明近地面CO2体积比浓度变化与温度变化有较强的负相关性。综上证明了标定结果的准确性, 为后续测量CO2垂直分布廓线提供了数据支持。

The calibration and error analysis of miniaturized atmosphere CO2 detection system were carried out by Li-7500 analyzer. Firstly, the CO2 volume ratio concentration was calibrated according to the measured data of four days. The absorption degree of the system was linear with the concentration CO2 measured by the Li-7500 CO2 analyzer, and the volume of CO2 was in good agreement with the calibration coefficient of the concentration. Secondly, the system was calibrated by the average data. The absolute value of the relative error of carbon dioxide volume ratio was less than 2.0%, and the correlation coefficient of Li-7500 CO2 analyzer was more than 0.9, which showed the stability and reliability of the system. Finally, according to the influence of temperature change on the atmospheric transport effect, the near ground CO2 in Hefei Science Island was analyzed. The characteristics of the diurnal variation showed that there was a strong negative correlation between the change of CO2 concentration and the change of temperature in the near ground. In summary, the accuracy of calibration results was verified, which provided data support for subsequent measurement of vertical profiles of CO2.