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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28310


    Title: Inter-comparison of three instruments for measuring regional background carbon monoxide
    Authors: Yang,CFO;Lin,YC;Lin,NH;Lee,CT;Sheu,GR;Kam,SH;Wang,JL
    Contributors: 中央大學
    Keywords: EARTHS ATMOSPHERE;CO;TROPOSPHERE;EVOLUTION;OZONE;CH4
    Date: 2009
    Issue Date: 2010-06-29 19:45:54 (UTC+8)
    Publisher: 化學研究所
    Abstract: Three CO instruments, i.e., vacuum ultraviolet resonance fluorescence (VUV-RF), gas chromatography/reduction gas detection (GC/RGD), and non-dispersive infrared (NDIR) spectrometry, were inter-compared at a background site, i.e., Lulin Atmospheric Baseline Station (LABS) in central Taiwan. For a period of 18 days of continuous measurements, highly coherent results were observed between the three instruments. Calibration of the GC/RGD and VUV-RF was based on the same batch of CO standards, producing results that agreed within 4%. Nevertheless, NDIR displayed a significant bias with a large offset compared to the other two instruments (about -63.1 ppb), due mainly to its over-simplified calibration procedure. The NDIR bias was then removed by aligning the NDIR data to those of GC/RGD in a process termed "post-run correction". Through this practice, the NDIR was linked to the same calibration scale as that of GC/RGD. As a result, by simultaneously exploiting both GC/RGD and NDIR to measure background CO, both time-resolution and accuracy can be secured. (C) 2009 Elsevier Ltd. All rights reserved.
    Relation: ATMOSPHERIC ENVIRONMENT
    Appears in Collections:[Graduate Institute of Chemistry] journal & Dissertation

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