Abstract. The study of aerosol optical properties is essential to understand its impact on the global climate. In our recent field measurement, a photoacoustic extinctiometer (PAX) and a cavity attenuated phase shift albedo monitor (CAPS-ALB) were used for online aerosol optical properties measurement. Laboratory calibration with gas and particle samples were carried out to correct disagreements of field measurements. During particle calibration, we adopted ammonium sulfate (AS) samples for scattering calibration of nephelometer parts of both the instruments, then combined with number-size distribution measurements into MIE model for calculating the value of the total scattering (extinction) coefficient. During gas calibration, we employed high concentration NO₂ for absorption calibration of PAX resonator, then further intercompared the extinction coefficient of CAPS-ALB with a cavity-enhanced spectrometer. The correction coefficient obtained from the laboratory calibration experiments was employed on the optical properties observed in the filed measurements correspondingly, and showed good result in comparison with reconstructed extinction from the IMPROVE model. The intercomparison of the calibrated optical properties of PAX and CAPS-ALB in field measurement were in good agreement with slopes of 1.052, 1.024 and 1.046 for extinction, scattering and absorption respectively, which shows the reliability of measurement results and verifies the correlation between the photoacoustic and the cavity attenuated phase shift instruments.

中文翻译：

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光声和腔衰减相移仪器的比对：实验室校准和现场测量

摘要。气溶胶光学特性的研究对于了解其对全球气候的影响至关重要。在我们最近的现场测量中，光声消光仪（PAX）和腔衰减相移反照率监测仪（CAPS-ALB）用于在线气溶胶光学性质测量。对气体和颗粒样品进行了实验室标定，以纠正现场测量的分歧。在粒子校准过程中，我们采用硫酸铵（AS）样品对两种仪器的浊度计部件进行散射校准，然后将数量大小分布测量值结合到MIE模型中，以计算总散射（消光）系数的值。在气体校准过程中，我们采用了高浓度的NO ₂为了对PAX谐振器进行吸收校准，然后将CAPS-ALB的消光系数与腔增强光谱仪进行了比较。通过实验室校准实验获得的校正系数分别用于在场测量中观察到的光学性质，与从IMPROVE模型重建的消光相比显示出良好的结果。在现场测量中，PAX和CAPS-ALB的校准光学性质的比对分别用于消光，散射和吸收的斜率分别为1.052、1.024和1.046，这表明测量结果的可靠性并验证了光声之间的相关性。和腔衰减相移仪器。