地基多轴DOAS仪器的NO_2斜柱浓度对比研究

Comparison of NO_2 Slant Columns Between Two Ground-Based MAX-DOAS

介绍了两台地基多轴DOAS仪器测量的NO2斜柱浓度的对比研究。利用日本海洋研究开发机构的一套多轴DOAS设备在2009年11月—12月31日期间16d的观测数据,与安光所自主研发的一套多轴DOAS设备测量的NO2差分斜柱浓度进行了对比。通过对比发现,采用自动调整积分时间的方法,与固定积分时间的设置相比仪器具有更高的信噪比;两套仪器的反演结果在小角度下具有比较好的一致性,相关系数高达0.995,但随着角度的增大相关性逐渐变差。在9点至16点时段内相对偏差较小,其中20°方向的结果最为接近,最小偏差仅有12%,但在9点前和16点后二者偏差增大。日方仪器在可见波段的反演结果明显好于紫外波段,反演中的剩余噪声减小了60%以上,同时在可见波段的差分斜柱浓度的计算结果与我们的多轴DOAS在紫外波段的计算结果在全天都具有非常好的一致性。

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.