Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 18, issue 22
Articles | Volume 18, issue 22
https://doi.org/10.5194/amt-18-7105-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-18-7105-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 22
Research article
 | 
28 Nov 2025
Research article |  | 28 Nov 2025

Reduction of airmass-dependent biases in TCCON XCH4 retrievals during polar vortex conditions

Jonas Hachmeister, Debra Wunch, Erin McGee, Kimberly Strong, Rigel Kivi, Justus Notholt, Thorsten Warneke, and Matthias Buschmann

Supplement

https://doi.org/10.5194/amt-18-7105-2025-supplement

Data sets

Polar vortex mask based on the Nash criterion Jonas Hachmeister https://doi.org/10.5281/zenodo.14507445

Model code and software

Calculation of polar vortex masks from ERA5 data using the Nash criterion Jonas Hachmeister https://doi.org/10.5281/zenodo.14507243

Modification of TCCON CH₄ prior profiles to better reflect polar vortex conditions Jonas Hachmeister https://doi.org/10.5281/zenodo.15877933

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Short summary
Methane measurements from the Total Carbon Column Observing Network (TCCON) are important for climate research, especially in the Arctic, where few measurements are available. We show that during early spring systematic errors are present in these data that are correlated to the presence of the polar vortex. These errors occur due to the usage of wrong methane prior shapes in the retrieval and can be alleviated by modifying the prior shape accordingly.
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