Articles | Volume 12, issue 8
Atmos. Meas. Tech., 12, 4149–4169, 2019
https://doi.org/10.5194/amt-12-4149-2019
Atmos. Meas. Tech., 12, 4149–4169, 2019
https://doi.org/10.5194/amt-12-4149-2019

Research article 01 Aug 2019

Research article | 01 Aug 2019

Recent improvements of long-path DOAS measurements: impact on accuracy and stability of short-term and automated long-term observations

Jan-Marcus Nasse et al.

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We present several changes to the setup of long-path differential optical absorption spectroscopy (LP-DOAS) instruments, including the application of a laser-driven light source, a modified coupling of the measurement signal between components, improved stray-light suppression, and better signal homogenization measures. These changes reduce detection limits of typical trace-gas species by a factor of 3–4 compared to previous setups and enable automated long-term observations in Antarctica.