Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 14
Articles | Volume 19, issue 14
https://doi.org/10.5194/amt-19-4703-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-4703-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 14
Research article
 | 
22 Jul 2026
Research article |  | 22 Jul 2026

Impact of Sentinel-5 SWIR detector persistence on trace gas retrievals

Mari C. Martinez-Velarte, Jochen Landgraf, Ben Veihelmann, Bernd Sierk, and Tobias Borsdorff

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Short summary
Launched in August 2025, Sentinel-5 provides daily CH4 and CO retrievals and is sensitive to CO2. Its shortwave-infrared (SWIR) mercury-cadmium-telluride (MCT) detectors exhibit persistence effects causing scene-dependent biases. This study quantifies these biases for CH4, CO, CO2, and the CH4/CO2 proxy using RemoTeC over regions with high radiance variability. Typical biases are small (<0.34 %), but outliers reach 1.59–4.01 %. Targeted post-filtering can reduce outliers and meet mission performance.
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