Assessment of recent advances in measurement techniques for atmospheric carbon dioxide and methane observations

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Zellweger , C , Emmenegger , L , Firdaus , M , Hatakka , J , Heimann , M , Kozlova , E , Spain , T G , Steinbacher , M , van der Schoot , M V & Buchmann , B 2016 , ' Assessment of recent advances in measurement techniques for atmospheric carbon dioxide and methane observations ' , Atmospheric Measurement Techniques , vol. 9 , no. 9 , pp. 4737-4757 . https://doi.org/10.5194/amt-9-4737-2016

Title: Assessment of recent advances in measurement techniques for atmospheric carbon dioxide and methane observations
Author: Zellweger, Christoph; Emmenegger, Lukas; Firdaus, Mohd; Hatakka, Juha; Heimann, Martin; Kozlova, Elena; Spain, T. Gerard; Steinbacher, Martin; van der Schoot, Marcel V.; Buchmann, Brigitte
Contributor: University of Helsinki, Department of Physics
Date: 2016-09-26
Language: eng
Number of pages: 21
Belongs to series: Atmospheric Measurement Techniques
ISSN: 1867-1381
URI: http://hdl.handle.net/10138/168831
Abstract: Until recently, atmospheric carbon dioxide (CO2) and methane (CH4) measurements were made almost exclusively using nondispersive infrared (NDIR) absorption and gas chromatography with flame ionisation detection (GC/FID) techniques, respectively. Recently, commercially available instruments based on spectroscopic techniques such as cavity ring-down spectroscopy (CRDS), off-axis integrated cavity output spectroscopy (OA-ICOS) and Fourier transform infrared (FTIR) spectroscopy have become more widely available and affordable. This resulted in a widespread use of these techniques at many measurement stations. This paper is focused on the comparison between a CRDS "travelling instrument" that has been used during performance audits within the Global Atmosphere Watch (GAW) programme of the World Meteorological Organization (WMO) with instruments incorporating other, more traditional techniques for measuring CO2 and CH4 (NDIR and GC/FID). We demonstrate that CRDS instruments and likely other spectroscopic techniques are suitable for WMO/GAW stations and allow a smooth continuation of historic CO2 and CH4 time series. Moreover, the analysis of the audit results indicates that the spectroscopic techniques have a number of advantages over the traditional methods which will lead to the improved accuracy of atmospheric CO2 and CH4 measurements.
Subject: CAVITY RING
AIRBORNE MEASUREMENTS
CO2 MEASUREMENTS
MOLE FRACTIONS
TRACE-GAS
MAUNA-LOA
AIR
CH4
SPECTROSCOPY
ANALYZER
114 Physical sciences
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