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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-128
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-128
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 May 2019

Research article | 21 May 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Continuous atmospheric CO2, CH4 and CO measurements at the OPE station in France from 2011 to 2018

Sébastien Conil1, Julie Helle2, Laurent Langrene1, Olivier Laurent2, and Michel Ramonet2 Sébastien Conil et al.
  • 1DRD/OPE, Andra, Bure, 55290, France
  • 2Laboratoire des Sciences du Climat et de l’Environnement (LSCE/IPSL), UMR CEA-CNRS-UVSQ, Gif-sur-Yvette, France

Abstract. Located in the North East of France, the Observatoire Pérenne de l'Environnement (OPE) station was built during the Integrated Carbon Observation System (ICOS) Demonstration Experiment to monitor the atmospheric concentration of greenhouse gases. Its continental rural background setting allows to fill the gaps between oceanic or mountain background stations and urban stations within the ICOS network. Continuous measurements of several greenhouse gases using high precision spectrometers started in 2011 on a tall tower with three sampling inlets at 10 m, 50 m and 120 m above the ground. The measurements quality are regularly assessed using several complementary approaches based on reference high pressure cylinders, traveling instruments audit and sets of travelling cylinders (so-called cucumber intercomparison). Thanks to the quality assurance strategy recommended by ICOS, the measurements precision are within the WMO compatibility goals for carbon dioxide (CO2), methane (CH4) and carbon monoxide (CO). The mixing ratios time series from 2011 to end of 2018 allow analyses of trends and diurnal and seasonal cycles. The CO2 and CH4 annual growth rates are respectively 2.4 ppm/year and 8.8 ppb/year for the 120 m above ground measurements over the investigated period. No significant trend has however been recorded for the CO mixing ratios. The afternoon mean residuals of these three compounds are significantly stronger during the cold period when inter-species correlations are high, compared to the warm period. The residuals variabilities show a close link with the air masses back-trajectories.

Sébastien Conil et al.
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Short summary
Continuous measurements of greenhouse gases using high precision spectrometers started in 2011 on a tall tower with three sampling inlets at 10 m, 50 m and 120 m above the ground at the OPE station, in the eastern part of France. The measurements strategy for carbon dioxide (CO2), methane (CH4) and carbon monoxide (CO) follows the ICOS recommendations. Over the 2011–2018 period, the CO2 and CH4 data show trends with annual growth rates of 2.4 ppm/year and 8.8 ppb/year at the 120 m level.
Continuous measurements of greenhouse gases using high precision spectrometers started in 2011...
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