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An active 4-axis differential optical absorption spectroscopy system is developed in the project. The system has 4 telescopes integrated together that can simultaneously project and receive 4 independent light beams for measurement. The 4 beams share one xenon short-arc lamp as the light source. Each telescope can be adjusted individually to point to different reflectors. The angle between different beams can be adjusted up to 28°. A test is conducted on the system with four beams setting to measure the concentration of NO2 in the same area. The comparison shows good consistency between measurement data from different beams: the correlation coefficient (R2) between the data from any two beams is no less than 0.97 and the average difference between different beams is below 1×10-9. The long-term observations on the vertical distributions of NO2 and SO2 around Fudan University reveal the average feature of its daily variation: the concentration of NO2 shows a variation of double-peak in a day, the 2 peaks occur in the early morning and the evening respectively, while the valleys occur in the afternoon and the wee hours; the layer of 44—66 m has the highest NO2 concentration, while the layer of 66—88 m the lowest; during the nighttime, inter-layer difference of NO2 concentration is higher than that during the daytime and can be as high as 17×10-9; the concentration of SO2 shows a variation of single-peak in a day, the peak occurs in the forenoon; the vertical distribution of SO2 is relatively even, with the inter-layer difference below 3×10-9.
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Keywords:
- differential optical absorption spectroscopy /
- NO2 /
- SO2 /
- air pollution
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[2] Platt U, Perner D, Ptz H W 1979 J. Geophys. Res. 84 6329
[3] Stutz J, Platt U 1996 Appl. Opt. 35 6041
[4] Stutz J, Wong K W, Lawrence L, Ziemba L, Flynn J H, Rappenglück B, Lefer B 2010 Atmos. Environ. 44 4099
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[15] Chen D, Zhou B, Hao N, Chen L M 2006 Acta Phys. Sin. 55 5555 (in Chinese) [陈 丹、 周 斌、 郝 楠、 陈立民 2006 55 5555]
[16] Zhou B, Liu W Q, Zheng C H, Zhang Y J, Song B C, Wang F P 2000 Acta Phys. Sin. 49 2507 (in Chinese) [周 斌、 刘文清、 郑朝晖、 张玉钧、 宋炳超、 王锋平 2000 49 2507]
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[19] Bogumil K, Orphal J,Homann T, Voigt S, Spietz P, Fleischmann O C, Vogel A, Hartmann M, Bovensmann H, Frerick J, Burrows J P 2003 J. Photochem. Photobiol. A 157 167
[20] Zhou B, Hao N, Chen L M 2005 Acta Phys. Sin. 54 4445 (in Chinese) [周 斌、 郝 楠、 陈立民 2005 54 4445]
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[1] Perner D, Platt U 1979 Geophys. Res. Lett. 6 917
[2] Platt U, Perner D, Ptz H W 1979 J. Geophys. Res. 84 6329
[3] Stutz J, Platt U 1996 Appl. Opt. 35 6041
[4] Stutz J, Wong K W, Lawrence L, Ziemba L, Flynn J H, Rappenglück B, Lefer B 2010 Atmos. Environ. 44 4099
[5] Li S W, Xie P H, Liu W Q, Si F Q, Li A, Peng F M 2008 Acta Phys. Sin. 57 1963 (in Chinese) [李素文、 谢品华、 刘文清、 司福祺、 李 昂、 彭夫敏 2008 57 1963]
[6] Zhou B, Liu W Q, Qi F, Li Z B, Cui Y J 2001 Acta Phys. Sin. 50 1818 (in Chinese) [周 斌、 刘文清、 齐 峰、 李振壁、 崔延军 2001 50 1818]
[7] Thornton J A, Wooldridge P J, Cohen R C, Williams E J, Hereid D, Fehsenfeld F C, Stutz J, Alicke B 2003 J. Geophys. Res. 108 4496
[8] Kim K H, Kim M Y 2001 Atoms. Environ. 35 4059
[9] Stutz J, Alicke B, Ackermann R, Geyer A, White A, Williams E 2004 J. Geophys. Res. 109 D12306
[10] Wang S, Ackermann R, Stutz J 2006 Atmos. Chem. Phys. 6 2671
[11] Zhu Y W, Xie P H, Dou K, Liu S S, Qin M, Li S W, Si F Q, Liu W Q 2009 Acta Opt. Sin. 29 297 (in Chinese) [朱燕舞、 谢品华、 窦 科、 刘世胜、 秦 敏、 李素文、 司福祺、 刘文清 2009 光学学报 29 297]
[12] Meng Z Y, Ding G A, Yu H Q, Wang S F 2002 Quart. J. Appl. Meteor. 13 109 (in Chinese) [孟昭阳、 丁国安、 于海青、 王淑凤 2002 应用气象学报 13 109]
[13] Platt U, Stutz J 2008 Differential Optical Absorption Spectroscopy—Principles and Applications (Berlin: Springer) p138—140
[14] Hao N, Zhou B, Chen L M 2006 Acta Phys. Sin. 55 1529 (in Chinese) [郝 楠、 周 斌、 陈立民 2006 55 1529]
[15] Chen D, Zhou B, Hao N, Chen L M 2006 Acta Phys. Sin. 55 5555 (in Chinese) [陈 丹、 周 斌、 郝 楠、 陈立民 2006 55 5555]
[16] Zhou B, Liu W Q, Zheng C H, Zhang Y J, Song B C, Wang F P 2000 Acta Phys. Sin. 49 2507 (in Chinese) [周 斌、 刘文清、 郑朝晖、 张玉钧、 宋炳超、 王锋平 2000 49 2507]
[17] Zhang Y H, Xie P H, Si F Q, Lin Y H, Peng F M, Li S W, Li A, Dou K, Zhu Y W 2008 J. Atmos. Environ. Opt. 3 134 (in Chinese) [张英华、 谢品华、 司福祺、 林艺辉、 彭夫敏、 李素文、 李 昂、 窦 科、 朱燕舞 2008 大气与环境光学学报 3 134]
[18] Mérienne M F, Jenouvrier A, Coquart B 1995 J. Atmos. Chem. 20 281
[19] Bogumil K, Orphal J,Homann T, Voigt S, Spietz P, Fleischmann O C, Vogel A, Hartmann M, Bovensmann H, Frerick J, Burrows J P 2003 J. Photochem. Photobiol. A 157 167
[20] Zhou B, Hao N, Chen L M 2005 Acta Phys. Sin. 54 4445 (in Chinese) [周 斌、 郝 楠、 陈立民 2005 54 4445]
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