Articles | Volume 16, issue 5
Atmos. Chem. Phys., 16, 2803–2817, 2016
https://doi.org/10.5194/acp-16-2803-2016
Atmos. Chem. Phys., 16, 2803–2817, 2016
https://doi.org/10.5194/acp-16-2803-2016
Research article
04 Mar 2016
Research article | 04 Mar 2016

Estimates of free-tropospheric NO2 and HCHO mixing ratios derived from high-altitude mountain MAX-DOAS observations at midlatitudes and in the tropics

Stefan F. Schreier et al.

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Short summary
Mixing ratios of NO2 and HCHO in the free troposphere are obtained from MAX-DOAS measurements at two mountain stations at midlatitudes and in the tropics using a modified geometrical approach. The method is applied in the UV wavelength range and, thus, allows the detection of HCHO mixing ratios, in addition to NO2. We find that mixing ratios of both species are increased in the tropical free troposphere due to biomass burning.
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