TY - JOUR
T1 - Inter-comparison of three instruments for measuring regional background carbon monoxide
AU - Ou Yang, Chang Feng
AU - Lin, Yu Chi
AU - Lin, Neng Huei
AU - Lee, Chung Te
AU - Sheu, Guey Rong
AU - Kam, Seak Hong
AU - Wang, Jia Lin
N1 - Funding Information:
This work was supported by the National Science Council (NSC) and EPA, Taiwan under the contracts NSC97-2752-M-008-011-PAE and EPA-98-FA11-03-A015.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
KW - Gas chromatography/reduction gas detection (GC/RGD)
KW - Inter-comparison
KW - Non-dispersive infrared (NDIR)
KW - Vacuum ultraviolet resonance fluorescence (VUV-RF)
UR - http://www.scopus.com/inward/record.url?scp=70749114940&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2009.09.026
DO - 10.1016/j.atmosenv.2009.09.026
M3 - 期刊論文
AN - SCOPUS:70749114940
SN - 1352-2310
VL - 43
SP - 6449
EP - 6453
JO - Atmospheric Environment
JF - Atmospheric Environment
IS - 40
ER -