A relaxed eddy accumulation flask sampling system for <sup>14</sup>C-based partitioning of fossil and non-fossil CO<sub>2</sub> fluxes

Kunz, Ann-Kristin; Borchardt, Lars; Christen, Andreas; Della Coletta, Julian; Eritt, Markus; Gutiérrez, Xochilt; Hashemi, Josh; Hilland, Rainer; Jordan, Armin; Kneißl, Richard; Legendre, Virgile; Levin, Ingeborg; Preunkert, Susanne; Rubli, Pascal; Stagakis, Stavros; Hammer, Samuel

doi:10.5194/amt-18-5349-2025

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.

https://doi.org/10.5194/amt-18-5349-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 20

Research article

|

15 Oct 2025

Research article |

| 15 Oct 2025

A relaxed eddy accumulation flask sampling system for ¹⁴C-based partitioning of fossil and non-fossil CO₂ fluxes

Ann-Kristin Kunz, Lars Borchardt, Andreas Christen, Julian Della Coletta, Markus Eritt, Xochilt Gutiérrez, Josh Hashemi, Rainer Hilland, Armin Jordan, Richard Kneißl, Virgile Legendre, Ingeborg Levin, Susanne Preunkert, Pascal Rubli, Stavros Stagakis, and Samuel Hammer

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Cumulative views and downloads (calculated since 10 Jan 2025)

Month	HTML	PDF	XML	Total
Jan 2025	284	54	6	344
Feb 2025	126	28	6	160
Mar 2025	70	8	4	82
Apr 2025	30	26	4	60
May 2025	78	14	4	96
Jun 2025	150	20	16	186
Jul 2025	68	14	4	86
Aug 2025	290	12	0	302
Sep 2025	1,266	10	4	1,280
Oct 2025	232	48	12	292
Nov 2025	227	60	18	305
Dec 2025	196	68	20	284
Jan 2026	316	63	20	399
Feb 2026	338	54	11	403
Mar 2026	152	51	12	215
Apr 2026	124	61	7	192
May 2026	81	33	1	115
Jun 2026	25	6	2	33
Jul 2026	152	44	7	203
Aug 2026	49	16	24	89
Sep 2026	105	54	49	208
Oct 2026	135	93	44	272

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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.

A relaxed eddy accumulation flask sampling system for ¹⁴C-based partitioning of fossil and non-fossil CO₂ fluxes

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A relaxed eddy accumulation flask sampling system for 14C-based partitioning of fossil and non-fossil CO2 fluxes

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A relaxed eddy accumulation flask sampling system for ¹⁴C-based partitioning of fossil and non-fossil CO₂ fluxes