Articles | Volume 18, issue 20
https://doi.org/10.5194/amt-18-5349-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-18-5349-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Oct 2025
Research article |
| 15 Oct 2025
| 15 Oct 2025
A relaxed eddy accumulation flask sampling system for 14C-based partitioning of fossil and non-fossil CO2 fluxes
Ann-Kristin Kunz
CORRESPONDING AUTHOR
Chair of Environmental Meteorology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany
Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
Lars Borchardt
ICOS Flask and Calibration Laboratory, Max Planck Institute for Biogeochemistry, Jena, Germany
Andreas Christen
Chair of Environmental Meteorology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany
Julian Della Coletta
Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
Markus Eritt
ICOS Flask and Calibration Laboratory, Max Planck Institute for Biogeochemistry, Jena, Germany
Xochilt Gutiérrez
ICOS Flask and Calibration Laboratory, Max Planck Institute for Biogeochemistry, Jena, Germany
Josh Hashemi
Chair of Environmental Meteorology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
Rainer Hilland
Chair of Environmental Meteorology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany
Armin Jordan
ICOS Flask and Calibration Laboratory, Max Planck Institute for Biogeochemistry, Jena, Germany
Richard Kneißl
ICOS Flask and Calibration Laboratory, Max Planck Institute for Biogeochemistry, Jena, Germany
Virgile Legendre
ICOS Flask and Calibration Laboratory, Max Planck Institute for Biogeochemistry, Jena, Germany
Ingeborg Levin
Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
deceased, 10 February 2024
Susanne Preunkert
Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
Pascal Rubli
Empa, Materials, Science and Technology, Dübendorf, Switzerland
Stavros Stagakis
Department of Environmental Sciences, University of Basel, Basel, Switzerland
Samuel Hammer
Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
Data sets
Flask data and logger program supporting the manuscript “A relaxed eddy accumulation flask sampling system for 14C-based partitioning of fossil and non-fossil CO2 fluxes” Ann-Kristin Kunz et al. https://doi.org/10.5281/zenodo.13926680
Short summary
We present, to our knowledge, the first relaxed eddy accumulation system explicitly tailored to a radiocarbon (14C)-based partitioning of fossil and non-fossil urban CO2 fluxes. Laboratory tests and in-depth quality and performance checks prove that the system meets the technical requirements. A pilot application on a tall tower in the city of Zurich, Switzerland, demonstrates the ability to separate fossil and non-fossil CO2 components within the typical precision of 14C measurements.
We present, to our knowledge, the first relaxed eddy accumulation system explicitly tailored to...
