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Observations of oscillations in the abundance of middle-atmospheric tracegases can provide insight into the dynamics of the middle atmosphere.Long-term, high-temporal-resolution and continuous measurements of dynamicaltracers within the strato- and mesosphere are rare but would facilitatebetter understanding of the impact of atmospheric waves on the middle atmosphere.Here we report on water vapor measurements from the ground-based microwaveradiometer MIAWARA (MIddle Atmospheric WAter vapor RAdiometer) located close to Bern during two winter periods of 6 months from October to March.Oscillations with periods between 6 and 30 h are analyzed in the pressure range 0.02–2 hPa. Seven outof 12 months have the highest wave amplitudes between 15 and 21 hperiods in the mesosphere above 0.1 hPa. The quasi 18 h wavesignature in the water vapor tracer is studied in more detail by analyzingits temporal evolution in the mesosphere up to an altitude of75 km. Eighteen-hour oscillations in midlatitude zonal wind observationsfrom the microwave Doppler wind radiometer WIRA (WInd RAdiometer) could be identified withinthe pressure range 0.1–1 hPa during an ARISE (Atmosphericdynamics Research InfraStructure in Europe)-affiliated measurement campaignat the Observatoire de Haute-Provence (355 km from Bern) in Francein 2013. The origin of the observed upper-mesospheric quasi 18 hoscillations is uncertain and could not be determined with our available datasets. Possible drivers could be low-frequency inertia-gravity waves or anonlinear wave–wave interaction between the quasi 2-day wave and the diurnaltide

Quasi 18 h wave activity in ground-based observed mesospheric H&lt;sub&gt;2&lt;/sub&gt;O over Bern, Switzerland

Quasi 18 h wave activity in ground-based observed mesospheric H<sub>2</sub>O over Bern, Switzerland