| 光谱学与光谱分析 |
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| Ring Effect and Correction Studies while Retrieving Trace Gas Concentration with Passive DOAS |
| ZHANG Ying-hua,XIE Pin-hua*,SI Fu-qi,PENG Fu-min,DOU Ke,LI Su-wen |
| Key Laboratory of Environmental Optical & Technology, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract The method of retrieving the concentration of trace gases using of the diagnostic absorption of trace gases based on the scattered sunlight is called passive DOAS. It has been developed so fast in recent years because it remains simple and is prone to being combined with different platform. While retrieving the column density of trace gases with the scattered sunlight as light source, it will be affected strongly by solar Fraunhofer lines, which is also called Ring effect. It makes it hard to retrieve trace gases concentration and affects measurement precision, especially for lower concentration. The influence of Ring effect and its relation with solar zenith angle in stable day will be introduced in the present paper, and the modification will be provided so that different Ring spectrum is selected according to different solar zenith angle. The slant column density (SCD) of NO2 for 3 stable days was retrieved with this modification. It was proved that the modification is possible.
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Received: 2007-10-02
Accepted: 2008-01-08
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Corresponding Authors:
XIE Pin-hua
E-mail: yinghuazhang2001@163.com
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