AI Article Synopsis
- The study compares NO2 slant columns measured by two ground-based multi-axis DOAS instruments, JAMASTEC and AIOFM, over a specific time frame in late 2009.
- It finds that using adjusted integral time enhances the signal-to-noise ratio, and both instruments show high correlation (0.995) at lower viewing angles, but this correlation decreases at higher angles.
- The best agreement between the instruments occurs from 9 AM to 5 PM, particularly at a 20-degree direction with a 12% deviation, and measurements in the visible range outperform those in the UV range.
Article Abstract
The study of comparison of NO2 SCD between two ground-based multi axis DOAS is introduced. The slant columns of NO2 from JAMASTEC are compared with those of AIOFM during the period from November to 31 December 2009. It says that the more signal to noise ratio is obtained by using the adjusted integral time rather than fixed settings; Two instrument show good accordance in the lower viewing angles, with the correlation coefficient of 0.995, but it becomes bad with higher viewing angles. The low deviation between the two instruments was achieved during the period from 9am to 17pm, the results in the 20 degree direction show best agreement with a deviation of 12%, but in other period the deviation becomes larger. The results in the visible range are better than those in the UV range, the residual in the fit decreases by more than 60%, and the results in the visible range show good agreements with those of AIOFM in the UV range during the whole day.
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