Articles | Volume 15, issue 18
Atmos. Chem. Phys., 15, 10567–10579, 2015
https://doi.org/10.5194/acp-15-10567-2015
Atmos. Chem. Phys., 15, 10567–10579, 2015
https://doi.org/10.5194/acp-15-10567-2015

Research article 25 Sep 2015

Research article | 25 Sep 2015

NO2 seasonal evolution in the north subtropical free troposphere

M. Gil-Ojeda et al.

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Short summary
The NO2 seasonal evolution in the free troposphere (FT) has been established for the first time, based on a remote sensing technique (MAXDOAS) and thus avoiding the problems of the local pollution of in situ instruments. A clear seasonality has been found, with background levels of 20-40pptv. Evidence has been found on fast, direct injection of surface air into the free troposphere. This result might have implications on the FT distribution of halogens and other species with marine sources.
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