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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 3
Ann. Geophys., 17, 405–414, 1999
https://doi.org/10.1007/s00585-999-0405-x
© European Geosciences Union 1999
Ann. Geophys., 17, 405–414, 1999
https://doi.org/10.1007/s00585-999-0405-x
© European Geosciences Union 1999

  31 Mar 1999

31 Mar 1999

Diurnal and semidiurnal tide in the upper middle atmosphere during the first year of simultaneous MF radar observations in northern and southern Japan (45°N and 31°N)

K. Hocke* and K. Igarashi K. Hocke and K. Igarashi
  • Communication Research Laboratory, Tokyo, Japan
  • *Present address: DLR, Kalkhorstweg 53, 17235 Neustrelitz, Germany, E-mail: hocke@nz.dlr.de

Abstract. The climatology of mean wind, diurnal and semidiurnal tide during the first year (1996-1997) of simultaneous wind observations at Wakkanai (45.4°N, 141.7°E) and Yamagawa (31.2°N, 130.6°E) is presented. The locations of the radars allow us to describe the latitudinal dependence of the tides. Tidal amplitude and phase profiles are compared with those of the global scale wave model (GSWM). While the observed amplitude profiles of the diurnal tide agree well with the GSWM values, the observed phase profiles often indicate longer vertical wavelengths than the GSWM phase profiles. In contrast to the GSWM simulation, the observations show a strong bimodal structure of the diurnal tide, with the phase advancing about 6 hours from summer to winter.

Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics; waves and tides)

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