Measurement report: Greenhouse gas profiles  and age of air  from the 2021 HEMERA-TWIN balloon launch

Schuck, Tanja J.; Degen, Johannes; Keber, Timo; Meixner, Katharina; Wagenhäuser, Thomas; Ghysels, Mélanie; Durry, Georges; Amarouche, Nadir; Zanchetta, Alessandro; van Heuven, Steven; Chen, Huilin; Laube, Johannes C.; Baartman, Sophie L.; van der Veen, Carina; Popa, Maria Elena; Engel, Andreas

doi:10.5194/acp-25-4333-2025

Articles | Volume 25, issue 7

https://doi.org/10.5194/acp-25-4333-2025

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

Special issue:

The tropopause region in a changing atmosphere (TPChange)...

https://doi.org/10.5194/acp-25-4333-2025

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

Articles | Volume 25, issue 7

Measurement report

|

17 Apr 2025

Measurement report |

| 17 Apr 2025

Measurement report: Greenhouse gas profiles and age of air from the 2021 HEMERA-TWIN balloon launch

Tanja J. Schuck, Johannes Degen, Timo Keber, Katharina Meixner, Thomas Wagenhäuser, Mélanie Ghysels, Georges Durry, Nadir Amarouche, Alessandro Zanchetta, Steven van Heuven, Huilin Chen, Johannes C. Laube, Sophie L. Baartman, Carina van der Veen, Maria Elena Popa, and Andreas Engel

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Jan 2025	90	32	6	128
Feb 2025	54	10	78	142
Mar 2025	36	24	114	174
Apr 2025	401	40	97	538
May 2025	148	25	18	191
Jun 2025	115	22	13	150
Jul 2025	100	25	1	126
Aug 2025	174	24	5	203
Sep 2025	415	38	3	456
Oct 2025	78	29	2	109
Nov 2025	135	53	6	194
Dec 2025	169	85	5	259
Jan 2026	314	65	22	401
Feb 2026	369	58	10	437
Mar 2026	107	63	14	184
Apr 2026	83	59	13	155
May 2026	52	25	8	85
Jun 2026	21	3	1	25
Jul 2026	105	23	12	140
Aug 2026	28	38	23	89
Sep 2026	24	21	17	62

Cumulative views and downloads (calculated since 25 Oct 2024)

Month	HTML	PDF	XML	Total
Oct 2024	178	52	12	242
Nov 2024	164	36	16	216
Dec 2024	62	18	6	86
Jan 2025	90	32	6	128
Feb 2025	54	10	78	142
Mar 2025	36	24	114	174
Apr 2025	401	40	97	538
May 2025	148	25	18	191
Jun 2025	115	22	13	150
Jul 2025	100	25	1	126
Aug 2025	174	24	5	203
Sep 2025	415	38	3	456
Oct 2025	78	29	2	109
Nov 2025	135	53	6	194
Dec 2025	169	85	5	259
Jan 2026	314	65	22	401
Feb 2026	369	58	10	437
Mar 2026	107	63	14	184
Apr 2026	83	59	13	155
May 2026	52	25	8	85
Jun 2026	21	3	1	25
Jul 2026	105	23	12	140
Aug 2026	28	38	23	89
Sep 2026	24	21	17	62

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Short summary

A balloon was launched in 2021 in the Arctic to carry instruments for trace gas measurements up to 32 km. One purpose was to compare measurement techniques. We focus on the major greenhouse gases. To measure these, air was sampled with the AirCore technique and with flask sampling, and samples were analysed after the flight. In flight, observations were done with an optical method. In a companion paper, we report on observations of chlorine and bromine containing trace gases.