多轴差分吸收光谱仪对大气污染物SO_2、NO_2、O_3的立体监测

Spatio-temporal Monitoring on SO_2,NO_2,O_3 with Multi-axis Differential Optical Absorption Spectroscopy

多轴差分吸收光谱仪(MAX-DOAS)是用来监测大气中痕量气体成分的专用仪器,它能同时自动监测SO2、NO2和O3三种污染气体,得到的垂直柱浓度对研究污染物的时空分布特点具有重要意义。分析了2011年5月下旬至2012年4月中旬期间MAX-DOAS在重庆市的测量数据,结果表明:夏季SO2的柱浓度高于其它季节,并在每个季节都出现了峰值:SO2与NO2之间浓度变化趋势相同,且最大小时浓度值都集中在上午;O3垂直柱浓度受气象条件和臭氧前体物的影响呈夏季高、秋冬低的季节性变化;通过多元回归建立了O3柱浓度与气象因素、前体物的关系式。

Multi -axis differential optical absorption spectroscopy （MAX -DOAS）is an instrument, which was used to moni- tor the gas content in air. It can monitor three kinds of pollutants simultaneously, such as sulfur dioxide, nitrogen dioxide and o- zone. The distribution of vertical column density plays an important role in studying the spatial - temporal distribution characteris- tic of pollutants. Analysis results based on data from 2011 late - May to 2012 mid - April show that the vertical column density in summer is higher than the other seasons, and every season has its own density peak value. Both sulfur dioxide and nitrogen diox- ide showed consistency in change tendency, and the maximum hourly density centralized in the morning. The vertical column den- sity of ozone was affected by meteorological conditions and season. Summer is the highest, winter and autumn are the lowest. U- sing the multiple regressions, the equation between ozone and meteorological condition and ozone precursor were formed.