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直射太阳光差分吸收光谱法测量合肥NO2整层柱浓度
Measurement of NO2 total vertical columns by direct-sun differential optical absorption spectroscopy in Hefei city
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摘要: 直射太阳光差分吸收光谱技术（DS-DOAS）近年来成功应用于大气痕量气体的垂直柱浓度测量.本文研究了基于被动DOAS算法可用于连续测量NO2整层垂直柱浓度的DS-DOAS技术,介绍了测量系统的构成.利用统计最小值外推法减少了由参考谱引入的误差.分析了测量结果的误差来源,估算了误差大小.报道了该系统在合肥地区对NO2进行的连续11天的测量,分析了测量结果.通过实验验证了算法的可行性,证实了该技术可实现连续测量NO2整层垂直柱浓度.
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关键词:
- 大气光学 /
- 直射太阳光差分吸收光谱 /
- N02整层垂直柱浓度
Abstract: Direct-sun DOAS（DS-DOAS） technique is successfully applied to the measurement of atmospheric trace gas vertical column density（VCD）.The DS-DOAS technique for continuously measuring NO2 total vertical column density is investigated based on the passive DOAS.The composition of system is introduced.The statistical method ＂minimum-amount Langley-extrapolation＂ is utilized to reduce the errors from the selected reference spectrum.The VCD measuring error is estimated and the error source is discussed.The NO2 total VCD is measured based on the system in Hefei city in a consecutive period of 11 days.And the results are analyzed.The experiment has verified the feasibility of the algorithm and proved that the technique can be used to continuously measure NO2 total vertical column density. -
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