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

Yver-kwok, Camille ; Philippon, Carole ; Bergamaschi, Peter ; Biermann, Tobias LU orcid ; Calzolari, Francescopiero ; Chen, Huilin ; Conil, Sebastien ; Cristofanelli, Paolo ; Delmotte, Marc and Hatakka, Juha , et al. (2021) In Atmospheric Measurement Techniques 14(1). p.89-116
Abstract
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 labeling 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... (More)
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 labeling 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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Measurement Techniques
volume
14
issue
1
pages
89 - 116
publisher
Copernicus GmbH
external identifiers
  • scopus:85099017416
ISSN
1867-8548
DOI
10.5194/amt-14-89-2021
language
English
LU publication?
yes
id
e44eafaa-4574-483f-9767-7e98021ed825
date added to LUP
2021-01-08 10:19:16
date last changed
2022-08-19 01:49:00
@article{e44eafaa-4574-483f-9767-7e98021ed825,
  abstract     = {{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 labeling 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.}},
  author       = {{Yver-kwok, Camille and Philippon, Carole and Bergamaschi, Peter and Biermann, Tobias and Calzolari, Francescopiero and Chen, Huilin and Conil, Sebastien and Cristofanelli, Paolo and Delmotte, Marc and Hatakka, Juha and Heliasz, Michal and Hermansen, Ove and Komínková, Kateřina and Kubistin, Dagmar and Kumps, Nicolas and Laurent, Olivier and Laurila, Tuomas and Lehner, Irene and Levula, Janne and Lindauer, Matthias and Lopez, Morgan and Mammarella, Ivan and Manca, Giovanni and Marklund, Per and Metzger, Jean-Marc and Mölder, Meelis and Platt, Stephen M. and Ramonet, Michel and Rivier, Leonard and Scheeren, Bert and Sha, Mahesh Kumar and Smith, Paul and Steinbacher, Martin and Vítková, Gabriela and Wyss, Simon}},
  issn         = {{1867-8548}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{1}},
  pages        = {{89--116}},
  publisher    = {{Copernicus GmbH}},
  series       = {{Atmospheric Measurement Techniques}},
  title        = {{Evaluation and optimization of ICOS atmosphere station data as part of the labeling process}},
  url          = {{http://dx.doi.org/10.5194/amt-14-89-2021}},
  doi          = {{10.5194/amt-14-89-2021}},
  volume       = {{14}},
  year         = {{2021}},
}