caa a22 4500 528794450 20191025051637.0 cr unu---uuuuu 180925s2018 xx s 000 0 eng 1680-7316 10.5194/acp-18-12061-2018 doi (BORIS)oai:boris.unibe.ch:120066 620 ddc Lainer Martin Long-term observation of midlatitude quasi 2-day waves by a water vapor radiometer [Elektronische Daten] [Martin Lainer, Klemens Hocke, Niklaus Kämpfer] publishedVersion openAccess eu-repo A mesospheric water vapor data set obtained by the middle atmospheric water vapor radiometer (MIAWARA) close to Bern, Switzerland (46.88°N, 7.46°E) during October 2010 to September 2017 is investigated to study the long-term evolution and variability of quasi 2-day waves (Q2DWs). We present a climatological overview and an insight on the dynamical behavior of these waves with the occurring spectrum of periods as seen from a midlatitude observation site. Such a large and nearly continuous measurement data set as ours is rare and of high scientific value. The core results of our investigation indicate that the activity of the Q2DW manifests in burst-like events and is higher during winter months (November-February) than during summer months (May-August) for the altitude region of the mesosphere (up to 0.02hPa in winter and up to 0.05hPa in summer) accessible for the instrument. Single Q2DW events reach at most about 0.8ppm in the H2O amplitudes. Further, monthly mean Q2DW amplitude spectra are presented and reveal a high-frequency variability between different months. A large fraction of identified Q2DW events (20%) develop periods between 38 and 40h. Further, we show the temporal evolution of monthly mean Q2DW oscillations continuously for all months and separated for single months over 7 years. The analysis of autobicoherence spectra gives evidence that Q2DWs are sometimes phase coupled to diurnal oscillations to a high degree and to waves with a period close to 18h. Hocke Klemens joint author Kämpfer Niklaus joint author Atmospheric chemistry and physics 18(16), pp. 12061-12074 1680-7316 367226995 https://boris.unibe.ch/120066/1/acp-18-12061-2018.pdf text/html WWW-Backlink auf das Repository 1 info:eu-repo/semantics/article boris PeerReviewed boris peerstatus BORIS 856 40 https://boris.unibe.ch/120066/1/acp-18-12061-2018.pdf text/html WWW-Backlink auf das Repository BORIS 100 1- Lainer Martin BORIS 700 1- Hocke Klemens joint author BORIS 700 1- Kämpfer Niklaus joint author BORIS 773 0- Atmospheric chemistry and physics 18(16), pp. 12061-12074 1680-7316 367226995 BK010053 XK010053 XK010000 BORIS BORIS BORIS info:eu-repo/semantics/article openAccess