Highlights Horizontal winds were measured by five meteor radars distributed from 13°E to 178°E in the middle and high-latitudes. We studied planetary wave propagation during October 2017 – February 2018. Planetary scale oscillations in the meridional wind are organized in groups. Each group successively propagates from one site to another one. Each group is observed at one site and almost disappears at the previous one.

    Abstract We present results of wind measurements near the mesopause carried out with meteor radars (MRs) at Collm (51°N, 13°E), Obninsk (55°N, 37°E), Kazan (56°N, 49°E), Angarsk (52°N, 104°E) and Anadyr (65°N, 178°E) from October 1, 2017 till March 31, 2018. The Collm and Kazan MRs are SKiYMET radars with vertical transmission and radio echo height finding, while the other radars operate with horizontal transmission and without height finding. We paid particular attention to the meridional wind variability with periods of 4–6 days and 9–11 days. The waves with these periods are seen as spots of the wave activity in the wavelet spectra and include oscillations with different periods and different discrete zonal wavenumbers. These wave packets successively propagate as a group of waves from one site to another one in such a way that they are observed at one site and almost disappear at the previous one. The 4–6 wave group includes planetary-scale oscillations (individual spectral components) which have eastward phase velocities and mostly zonal wavenumbers 2 and 3, and the vertical wavelength exceeds 70 km at middle latitudes. The source of the oscillations is the polar jet instability. The wave group itself propagates westward, and the amplitudes of wind oscillations are approximately 5–6 m/s as obtained from the wind data averaged over the meteor zone. The 9–11 day wave set propagates westward as a group and mainly consists of spectral components which have westward phase velocity and zonal wavenumber 1. Amplitudes of these wind perturbations strongly vary from station to station and can reach, approximately, 8 m/s. The vertical wavenumber is 0.014 km−1 as taken from the Kazan and 0.05 km−1 according to the Collm data. We obtained a global view on the waves by using the AURA MLS geopotential data. We found a good correspondence between wave features obtained from the MR wind measurements and the MLS data. To our knowledge, such a wave propagation of planetary wave in the mesosphere/lower thermosphere (MLT) region has so far not obtained much attention.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Some features of the day-to-day MLT wind variability in winter 2017–2018 as seen with a European/Siberian meteor radar network


    Beteiligte:
    Merzlyakov, E. (Autor:in) / Solovyova, T. (Autor:in) / Yudakov, A. (Autor:in) / Korotyshkin, D. (Autor:in) / Jacobi, Ch. (Autor:in) / Lilienthal, F. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 65 , 6 ; 1529-1543


    Erscheinungsdatum :

    2019-12-17


    Format / Umfang :

    15 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Mesopause-region Tidal Variability Observed by Meteor Radar

    Beard, A. G. / Mitchell, N. J. / Williams, P. J. S. et al. | British Library Conference Proceedings | 1997


    Market Insight. Europese Binnenvaart. Winter 2017/2018

    Zentralkommission für die Rheinschifffahrt (ZKR) | HENRY – Bundesanstalt für Wasserbau (BAW) | 2017

    Freier Zugriff

    Market Insight. Europäische Binnenschifffahrt. Winter 2017/2018

    Zentralkommission für die Rheinschifffahrt (ZKR) | HENRY – Bundesanstalt für Wasserbau (BAW) | 2017

    Freier Zugriff