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Research article - Peer-reviewed, 2021

Evaluation and optimization of ICOS atmosphere station data as part of the labeling process

Yver-Kwok, Camille; Philippon, Carole; Bergamaschi, Peter; Biermann, Tobias; Calzolari, Francescopiero; Chen, Huilin; Conil, Sebastien; Cristofanelli, Paolo; Delmotte, Marc; Hatakka, Juha; Heliasz, Michal; Hermansen, Ove; Kominkova, Katerina; Kubistin, Dagmar; Kumps, Nicolas; Laurent, Olivier; Laurila, Tuomas; Lehner, Irene; Levula, Janne; Lindauer, Matthias;
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The Integrated Carbon Observation System (ICOS) is a pan-European research infrastructure which provides harmonized and high-precision scientific data on the carbon cycle and the greenhouse gas budget. All stations have to undergo a rigorous assessment before being labeled, i.e., receiving approval to join the network. In this paper, we present the labeling process for the ICOS atmosphere network through the 23 stations that were labeled between November 2017 and November 2019. We describe the label-ing steps, as well as the quality controls, used to verify that the ICOS data (CO2, CH4, CO and meteorological measurements) attain the expected quality level defined within ICOS. To ensure the quality of the greenhouse gas data, three to four calibration gases and two target gases are measured: one target two to three times a day, the other gases twice a month. The data are verified on a weekly basis, and tests on the station sampling lines are performed twice a year. From these high-quality data, we conclude that regular calibrations of the CO2, CH4 and CO analyzers used here (twice a month) are important in particular for carbon monoxide (CO) due to the analyzer's variability and that reducing the number of calibration injections (from four to three) in a calibration sequence is possible, saving gas and extending the calibration gas lifespan. We also show that currently, the on-site water vapor correction test does not deliver quantitative results possibly due to environmental factors. Thus the use of a drying system is strongly recommended. Finally, the mandatory regular intake line tests are shown to be useful in detecting artifacts and leaks, as shown here via three different examples at the stations.

Published in

Atmospheric Measurement Techniques
2021, volume: 14, number: 1, pages: 89-116

Authors' information

Yver-Kwok, Camille
Universite Paris Saclay
Philippon, Carole
Universite Paris Saclay
Bergamaschi, Peter
European Commission Joint Research Centre
Biermann, Tobias
Lund University
Calzolari, Francescopiero
Consiglio Nazionale delle Ricerche (CNR)
Chen, Huilin
University of Groningen
Conil, Sebastien
Cristofanelli, Paolo
Consiglio Nazionale delle Ricerche (CNR)
Delmotte, Marc
Universite Paris Saclay
Hatakka, Juha
Finnish Meteorological Institute
Heliasz, Michal
Lund University
Hermansen, Ove
Norwegian Institute for Air Research
Kominkova, Katerina
Global Change Research Centre of the Czech Academy of Sciences
Kubistin, Dagmar
Deutscher Wetterdienst
Kumps, Nicolas
Royal Belgian Inst Space Aeron BIRA IASB
Laurent, Olivier
Universite Paris Saclay
Laurila, Tuomas
Finnish Meteorological Institute
Lehner, Irene
Lund University
Levula, Janne
University of Helsinki
Lindauer, Matthias
Deutscher Wetterdienst
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UKÄ Subject classification

Meteorology and Atmospheric Sciences

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