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    "citationRis": "TY  - RPRT\r\nT1  - ICOS CAL - Quality Control Report 2021\r\nAU  - Jordan, Armin\r\nAU  - Schumacher, Marcus\r\nDO  - 10.18160/RS2Q-RA1Q\r\nUR  - https://meta.icos-cp.eu/objects/8_58EsZZCIwHto3WYAFtw4w-\r\nAB  - The ICOS Central Analytical Laboratories (CALs) play a central role in assuring the accuracy of atmospheric\nobservations within ICOS. This involves the central provision of reference gases to the ICOS atmospheric\nnetwork and calibrating these standards based on the World Meteorological Organization (WMO) calibration\nscales. A quality control strategy for the ICOS atmospheric measurements has been described within the\nAtmospheric Station Specification document [ATC 2020].\nIn this report the quality control measures are described that are made by the ICOS-CAL Flask and Calibration\nLaboratory (FCL) to characterize the performance of their calibration of ICOS reference gases. It updates and\nreplaces the QC 2020 report following the same assessment scheme with only minor changes and some few\ncorrections. The results of these activities of the recent years are presented in detail for each of the ICOS core\ncomponents for in-situ observations (CO2, CH4, CO) and N2O. The results are then assessed and used to\nsubstantiate estimates of the measurement uncertainties of the different tracers and to quantify different\nuncertainty contributions. This involves an evaluation of the uncertainty of the reference values of calibration\nstandard gases (\"scale link uncertainty\") and the measurement uncertainty related to the respective analyzer’s\nprecision or response stability over time.\r\nKW  - Quality Control\r\nKW  - Calibration\r\nKW  - Measurement uncertainty\r\nKW  - Greenhouse Gases\r\nPY  - 2022\r\nPB  - ICOS CAL\r\nER  -",
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