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Feasibility study of using a "travelling" CO2 and CH4 instrument to validate continuous in situ measurement stations

Hammer, S.; Konrad, G.; Vermeulen, Alex LU ; Laurent, O.; Delmotte, M.; Jordan, A.; Hazan, L.; Conil, S. and Levin, I. (2013) In Atmospheric Measurement Techniques 6(5). p.1201-1216
Abstract
In the course of the ICOS (Integrated Carbon Observation System) Demonstration Experiment a feasibility study on the usefulness of a travelling comparison instrument (TCI) was conducted in order to evaluate continuous atmospheric CO2 and CH4 measurements at two European stations. The aim of the TCI is to independently measure ambient air in parallel to the standard station instrumentation, thus providing a comprehensive comparison that includes the sample intake system, the instrument itself as well as its calibration and data evaluation. Observed differences between the TCI and a gas chromatographic system, which acted as a reference for the TCI, were -0.02 +/- 0.08 mu mol mol(-1) for CO2 and -0.3 +/- 2.3 nmol mol(-1) for CH4. Over a... (More)
In the course of the ICOS (Integrated Carbon Observation System) Demonstration Experiment a feasibility study on the usefulness of a travelling comparison instrument (TCI) was conducted in order to evaluate continuous atmospheric CO2 and CH4 measurements at two European stations. The aim of the TCI is to independently measure ambient air in parallel to the standard station instrumentation, thus providing a comprehensive comparison that includes the sample intake system, the instrument itself as well as its calibration and data evaluation. Observed differences between the TCI and a gas chromatographic system, which acted as a reference for the TCI, were -0.02 +/- 0.08 mu mol mol(-1) for CO2 and -0.3 +/- 2.3 nmol mol(-1) for CH4. Over a period of two weeks each, the continuous CO2 and CH4 measurements at two ICOS field stations, Cabauw (CBW), the Netherlands and Houdelaincourt (Observatoire Perenne de l'Environnement, OPE), France, were compared to co-located TCI measurements. At Cabauw mean differences of 0.21 +/- 0.06 mu mol mol(-1) for CO2 and 0.41 +/- 0.50 nmol mol(-1) for CH4 were found. For OPE the mean differences were 0.13 +/- 0.07 mu mol mol(-1) for CO2 and 0.44 +/- 0.36 nmol mol(-1) for CH4. Offsets arising from differences in the working standard calibrations or leakages/contaminations in the drying systems are too small to explain the observed differences. Hence the most likely causes of these observed differences are leakages or contaminations in the intake lines and/or their flushing contribution originates from insufficient flushing of standard gases. Although the TCI is an extensive quality control approach it cannot replace other quality control systems. Thus, a comprehensive quality management strategy for atmospheric monitoring networks is proposed as well. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Measurement Techniques
volume
6
issue
5
pages
1201 - 1216
publisher
Copernicus Gesellschaft mbH
external identifiers
  • wos:000321679200007
  • scopus:84882796982
ISSN
1867-1381
DOI
10.5194/amt-6-1201-2013
language
English
LU publication?
no
id
a48a89ad-bd57-461a-b1a6-21b3669f9b0c (old id 4623759)
date added to LUP
2014-09-15 18:11:50
date last changed
2019-03-05 01:38:43
@article{a48a89ad-bd57-461a-b1a6-21b3669f9b0c,
  abstract     = {In the course of the ICOS (Integrated Carbon Observation System) Demonstration Experiment a feasibility study on the usefulness of a travelling comparison instrument (TCI) was conducted in order to evaluate continuous atmospheric CO2 and CH4 measurements at two European stations. The aim of the TCI is to independently measure ambient air in parallel to the standard station instrumentation, thus providing a comprehensive comparison that includes the sample intake system, the instrument itself as well as its calibration and data evaluation. Observed differences between the TCI and a gas chromatographic system, which acted as a reference for the TCI, were -0.02 +/- 0.08 mu mol mol(-1) for CO2 and -0.3 +/- 2.3 nmol mol(-1) for CH4. Over a period of two weeks each, the continuous CO2 and CH4 measurements at two ICOS field stations, Cabauw (CBW), the Netherlands and Houdelaincourt (Observatoire Perenne de l'Environnement, OPE), France, were compared to co-located TCI measurements. At Cabauw mean differences of 0.21 +/- 0.06 mu mol mol(-1) for CO2 and 0.41 +/- 0.50 nmol mol(-1) for CH4 were found. For OPE the mean differences were 0.13 +/- 0.07 mu mol mol(-1) for CO2 and 0.44 +/- 0.36 nmol mol(-1) for CH4. Offsets arising from differences in the working standard calibrations or leakages/contaminations in the drying systems are too small to explain the observed differences. Hence the most likely causes of these observed differences are leakages or contaminations in the intake lines and/or their flushing contribution originates from insufficient flushing of standard gases. Although the TCI is an extensive quality control approach it cannot replace other quality control systems. Thus, a comprehensive quality management strategy for atmospheric monitoring networks is proposed as well.},
  author       = {Hammer, S. and Konrad, G. and Vermeulen, Alex and Laurent, O. and Delmotte, M. and Jordan, A. and Hazan, L. and Conil, S. and Levin, I.},
  issn         = {1867-1381},
  language     = {eng},
  number       = {5},
  pages        = {1201--1216},
  publisher    = {Copernicus Gesellschaft mbH},
  series       = {Atmospheric Measurement Techniques},
  title        = {Feasibility study of using a "travelling" CO2 and CH4 instrument to validate continuous in situ measurement stations},
  url          = {http://dx.doi.org/10.5194/amt-6-1201-2013},
  volume       = {6},
  year         = {2013},
}