Long-term observation of midlatitude quasi 2-day waves by a water vapor radiometer

Lainer, Martin; Hocke, Klemens; Kämpfer, Niklaus (2018). Long-term observation of midlatitude quasi 2-day waves by a water vapor radiometer. Atmospheric chemistry and physics, 18(16), pp. 12061-12074. European Geosciences Union 10.5194/acp-18-12061-2018

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Lainer, Martin and Hocke, Klemens

Subjects:

600 Technology > 620 Engineering

ISSN:

1680-7316

Publisher:

European Geosciences Union

Language:

English

Submitter:

Franziska Stämpfli

Date Deposited:

24 Sep 2018 09:14

Last Modified:

24 Oct 2019 05:11

Publisher DOI:

10.5194/acp-18-12061-2018

BORIS DOI:

10.7892/boris.120066

URI:

https://boris.unibe.ch/id/eprint/120066

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