GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Comparing different light-emitting diodes as light sources for long path differential optical absorption spectroscopy NO2 and SO2 measurements |
Chan Ka-Lok (陈嘉乐)a b, Ling Liu-Yi (凌六一)a, Andreas Hartlb, Zheng Ni-Na (郑尼娜)a, Gerrit Kuhlmannb, Qin Min (秦敏)a, Sun You-Wen (孙友文)a, Xie Pin-Hua (谢品华)a, Liu Wen-Qing (刘文清)a, Mark Wenigb |
a Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; b School of Energy and Environment, City University of Hong Kong, Hong Kong, China |
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Abstract In this paper, we present the comparison of different light-emitting diodes (LEDs) as the light source for long path differential optical absorption spectroscopy (LP-DOAS) atmospheric trace gas measurements. In our study, we use a fiber optic design, where high power LEDs used as the light source are coupled into the telescope using a Y shape fiber bundle. Two blue and a ultraviolet (UV) LEDs with different emission wavelength ranges are tested for NO2 and SO2 measurements. The detailed description of the instrumental setup, the NO2 and SO2 retrieval procedure, the error analysis, and the preliminary results from the measurements carried out in Science Island, Hefei, Anhui, China are presented. Our first measurement results show that atmospheric NO2 and SO2 have strong temporal variations in that area and that the measurement accuracy is strongly dependent on the visibility conditions. The measured NO2 and SO2 data are compared to the Ozone Monitoring Instrument (OMI) satellite observations. The results show that the OMI NO2 product underestimates the ground level NO2 by 45%, while the OMI SO2 data are highly influenced by clouds and aerosols, which can lead to large biases in the ground level concentrations. During the experiment, the mixing ratios of the atmospheric NO2 and SO2 vary from 8 ppbv to 36 ppbv and from 3 ppbv to 18 ppbv, respectively.
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Received: 30 March 2012
Revised: 23 May 2012
Accepted manuscript online:
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PACS:
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93.90.+y
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(Other topics in geophysical observations, instrumentation, and techniques)
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Fund: Project supported by the National High-Technology Research and Development Program of China (Grant No. 2009AA063006) and the National Natural Science Foundation of China (Grant No. 60808034). |
Corresponding Authors:
Xie Pin-Hua
E-mail: phxie@aiofm.ac.cn
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Cite this article:
Chan Ka-Lok (陈嘉乐), Ling Liu-Yi (凌六一), Andreas Hartl, Zheng Ni-Na (郑尼娜), Gerrit Kuhlmann, Qin Min (秦敏), Sun You-Wen (孙友文), Xie Pin-Hua (谢品华), Liu Wen-Qing (刘文清), Mark Wenig Comparing different light-emitting diodes as light sources for long path differential optical absorption spectroscopy NO2 and SO2 measurements 2012 Chin. Phys. B 21 119301
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