ICOS CAL - Quality Control Report 2021

@article{https://doi.org/10.18160/rs2q-ra1q,
  doi = {10.18160/RS2Q-RA1Q},
  url = {https://meta.icos-cp.eu/objects/8_58EsZZCIwHto3WYAFtw4w-},
  author = {Jordan, Armin and Schumacher, Marcus},
  keywords = {Quality Control, Calibration, Measurement uncertainty, Greenhouse Gases},
  title = {ICOS CAL - Quality Control Report 2021},
  publisher = {ICOS CAL},
  year = {2022},
  copyright = {Creative Commons Attribution 4.0 International}
}

TY  - RPRT
T1  - ICOS CAL - Quality Control Report 2021
AU  - Jordan, Armin
AU  - Schumacher, Marcus
DO  - 10.18160/RS2Q-RA1Q
UR  - https://meta.icos-cp.eu/objects/8_58EsZZCIwHto3WYAFtw4w-
AB  - The ICOS Central Analytical Laboratories (CALs) play a central role in assuring the accuracy of atmospheric
observations within ICOS. This involves the central provision of reference gases to the ICOS atmospheric
network and calibrating these standards based on the World Meteorological Organization (WMO) calibration
scales. A quality control strategy for the ICOS atmospheric measurements has been described within the
Atmospheric Station Specification document [ATC 2020].
In this report the quality control measures are described that are made by the ICOS-CAL Flask and Calibration
Laboratory (FCL) to characterize the performance of their calibration of ICOS reference gases. It updates and
replaces the QC 2020 report following the same assessment scheme with only minor changes and some few
corrections. The results of these activities of the recent years are presented in detail for each of the ICOS core
components for in-situ observations (CO2, CH4, CO) and N2O. The results are then assessed and used to
substantiate estimates of the measurement uncertainties of the different tracers and to quantify different
uncertainty contributions. This involves an evaluation of the uncertainty of the reference values of calibration
standard gases ("scale link uncertainty") and the measurement uncertainty related to the respective analyzer’s
precision or response stability over time.
KW  - Quality Control
KW  - Calibration
KW  - Measurement uncertainty
KW  - Greenhouse Gases
PY  - 2022
PB  - ICOS CAL
ER  -