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Assessment of a Multi-species in Situ Ftir for Precise Atmospheric Greenhouse Gas Observations : Volume 6, Issue 5 (07/05/2013)

By Hammer, S.

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Book Id: WPLBN0003999083
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: Assessment of a Multi-species in Situ Ftir for Precise Atmospheric Greenhouse Gas Observations : Volume 6, Issue 5 (07/05/2013)  
Author: Hammer, S.
Volume: Vol. 6, Issue 5
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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T. Griffit, D. W., Konrad, G., Levin, I., Hammer, S., Caldow, C., & Vardag, S. (2013). Assessment of a Multi-species in Situ Ftir for Precise Atmospheric Greenhouse Gas Observations : Volume 6, Issue 5 (07/05/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany. We thoroughly evaluate the performance of a multi-species, in situ Fourier transform infrared (FTIR) analyser with respect to high-accuracy needs for greenhouse gas monitoring networks. The in situ FTIR analyser is shown to measure CO2, CO, CH4 and N2O mole fractions continuously, all with better reproducibility than the inter-laboratory compatibility (ILC) goals, requested by the World Meteorological Organization (WMO) for the Global Atmosphere Watch (GAW) programme. Simultaneously determined Δ13CO2 reaches reproducibility as good as 0.03‰. Second-order dependencies between the measured components and the thermodynamic properties of the sample, (temperature, pressure and flow rate) and the cross sensitivities among the sample constituents are investigated and quantified. We describe an improved sample delivery and control system that minimises the pressure and flow rate variations, making post-processing corrections for those quantities non-essential. Temperature disequilibrium effects resulting from the evacuation of the sample cell are quantified and improved by the usage of a faster temperature sensor. The instrument has proven to be linear for all measured components in the ambient concentration range. The temporal stability of the instrument is characterised on different time scales. Instrument drifts on a weekly time scale are only observed for CH4 (0.04 nmol mol−1 day−1) and Δ13CO2 (0.02‰ day−1). Based on 10 months of continuously collected quality control measures, the long-term reproducibility of the instrument is estimated to ±0.016 μmol mol−1 CO2, ±0.03‰ Δ13CO2, ±0.14 nmol mol−1 CH4, ±0.1 nmol mol−1 CO and ±0.04 nmol mol−1 N2O. We propose a calibration and quality control scheme with weekly calibrations of the instrument that is sufficient to reach WMO-GAW inter-laboratory compatibility goals.

Summary
Assessment of a multi-species in situ FTIR for precise atmospheric greenhouse gas observations

Excerpt
Chen, H., Winderlich, J., Gerbig, C., Hoefer, A., Rella, C. W., Crosson, E. R., Van Pelt, A. D., Steinbach, J., Kolle, O., Beck, V., Daube, B. C., Gottlieb, E. W., Chow, V. Y., Santoni, G. W., and Wofsy, S. C.: High-accuracy continuous airborne measurements of greenhouse gases (CO2 and CH4) using the cavity ring-down spectroscopy (CRDS) technique, Atmos. Meas. Tech., 3, 375–386, doi:10.5194/amt-3-375-2010, 2010.; Chen, H., Karion, A., Rella, C. W., Winderlich, J., Gerbig, C., Filges, A., Newberger, T., Sweeney, C., and Tans, P. P.: Accurate measurements of carbon monoxide in humid air using the cavity ring-down spectroscopy (CRDS) technique, Atmos. Meas. Tech. Discuss., 5, 6493–6517, doi:10.5194/amtd-5-6493-2012, 2012.; Esler, M. B., Griffith, D. W. T., Wilson, S. R., and Steele, L. P.: Precision trace gas analysis by FT-IR spectroscopy 1. Simultaneous analysis of CO2, CH4, N2O and CO in air, Anal. Chem., 72, 206–215, 2000a.; Esler, M. B., Griffith, D. W. T., Wilson, S. R., and Steele, L. P.: Precision trace gas analysis by FT-IR spectroscopy 2. The 13C/12C isotope ratio of CO2, Anal. Chem., 72, 216–221, 2000b.; Francey, R. J. and Steele L. P. Measuring atmospheric carbon dioxide – the calibration challenge, Accredit. Qual. Assur., 8, 200–204, 2003.; Glatzel-Mattheier, H.: Bilanzierung von CH4-Emissionen in Deutschland anhand atmosphärischer Messungen in Heidelberg, Ph.D. Thesis, University of Heidelberg, Germany, 129 pp., 1997.; Griffith, D. W. T.: Synthetic calibration and quantitative analysis of gas phase infrared spectra, Appl. Spectrosc., 50, 59–70, 1996.; Griffith, D. W. T., Esler, M. B., Steele, L. P., and Reisinger, A.: Non-linear least squares: high precision quantitative analysis of gas phase FTIR spectra, in: 2nd International Conference on Advanced Vibrational Spectroscopy, Nottingham, 2003.; Griffith, D. W. T., Deutscher, N. M., Krummel, P., Fraser, P., van der Schoot, M., and Allison, C.: The UOW FTIR trace gas analyser: Comparison with Loflo, AGAGE and tank measurements at Cape Grim and GASLAB, Baseline Atmospheric Program (Australia), 2010.; Griffith, D. W. T., Deutscher, N. M., Caldow, C., Kettlewell, G., Riggenbach, M., and Hammer, S.: A Fourier transform infrared trace gas and isotope analyser for atmospheric applications, Atmos. Meas. Tech., 5, 2481–2498, doi:10.5194/amt-5-2481-2012, 2012.; Hammer, S.: Quantification of the regional H2 sources and sinks inferred from atmospheric trace gas variability, Ph.D. Thesis, University of Heidelberg, Germany, 121 pp., 2008.; Hammer, S., Vogel, F., Kaul, M., and Levin, I.: The H2/CO ratio of emissions from combustion sources: comparison of top-down with bottom-up measurements in the Rhine-Neckar region in south-west Germany, Tellus, 61B, 547–555, doi:10.1111/j.1600-0889.2009.00418.x, 2009.; Hammer, S., Konrad, G., Vermeulen, A. T., Laurent, O., Delmotte, M., Jordan, A., Hazan, L., Conil, S., and Levin, I.: Feasibility study of using a travelling CO2 and CH4 instrument to validate continuous in-situ measurement stations, Atmos. Meas. Tech. Discuss., 5, 7141–7185, doi:10.5194/amtd-5-7141-2012, 2012.; Huang, L., Chivulescu, A., Allison, C., Brailsford, G., Brand, W. A., Wendeberg, M., Bollenbacher, A., Keeling, R., Levin, I., Sabasch, M., Leuenberger, M., Mukai, H., Nakazawa, T., Aoki, S., Neubert, R., Aerts-Bijma, A., Verkouteren, M., White, J., Vaughn, B., Michel, S.

 

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