Application of Two-Dimensional Wavelet Analysis to Wind Disturbances Observed with MU Radar in the Lower Stratosphere and Troposphere

Shimomai, Toyoshi; Yamanaka, Manabu D.; Fukao, S.

doi:10.5636/jgg.49.supplement_s205

Cited by 2 publications

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References 21 publications

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“…More detailed studies using another technique (cf. Shimomai et al, , 1997 and other data of different seasons are strongly expected to clarify why these variabilities appear. Answers to this question may explain also the generation mechanisms of the middleatmospheric inertio-gravity waves.…”

Section: Discussionmentioning

confidence: 90%

Horizontal variations of gravity wave activities in the lower stratosphere over Japan: A case study in the Baiu season 1991

et al. 2014

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Vertical wavenumber spectra are analyzed by using temperature, zonal wind and meridional wind data obtained with MU radar and radiosondes at the MU observatory in Shigaraki and with operational rawinsondes at five stations over Japan. The temperature and meridional wind spectral power densities of the dominant gravity wave increase with a decrease of latitude, whereas the zonal wind spectral power seems to have a maximum near the tropopausal jet stream axis. An analysis technique to estimate a characteristic value of intrinsic frequency from the wind and temperature vertical-wavenumber spectra is proposed. The different meridional distributions of spectral power densities for temperature, zonal wind and meridional wind possibly can be explained by a latitudinal distribution of the characteristic intrinsic frequency.

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Section: Discussionmentioning

confidence: 90%

Horizontal variations of gravity wave activities in the lower stratosphere over Japan: A case study in the Baiu season 1991

et al. 2014

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Hierarchical Structures of Medium-Scale Cyclones and Cloud Clusters near the Baiu Front Observed by MU and Meteorological Radars: Outline and Preliminary Results of Three-Week Observation Campaign.

Shibagaki

Yamanaka

Uyeda

et al. 1996

J. geomagn. geoelec

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We have carried out tropospheric observations by the MU radar (VHF-band) and meteorological radars (C-, Ku-and X-bands) for three weeks during the Bain (early summer rain) season in 1991 (17 June -8 July). We produced a complete data set of three-dimensional wind velocity, turbulence parameters, cloud and precipitation with high reliability and resolution. Results of the data analysis show that a meso-a-scale cyclone on the Baiu front has an asymmetric hierarchical structure of vertical velocity fluctuation distributions, which consists of meso-/3-scale cloud clusters (with strong upward velocities and rainfalls) and meso-y-scale developing clouds (with remarkably strong events). Further, they are restricted by the lowest level of the stratiform turbulence near the tropopause and the frontal surface and are especially activated near the warm and cold fronts on the ground in the cyclone center.

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Application of Two-Dimensional Wavelet Analysis to Wind Disturbances Observed with MU Radar in the Lower Stratosphere and Troposphere

Cited by 2 publications

References 21 publications

Horizontal variations of gravity wave activities in the lower stratosphere over Japan: A case study in the Baiu season 1991

Horizontal variations of gravity wave activities in the lower stratosphere over Japan: A case study in the Baiu season 1991

Hierarchical Structures of Medium-Scale Cyclones and Cloud Clusters near the Baiu Front Observed by MU and Meteorological Radars: Outline and Preliminary Results of Three-Week Observation Campaign.

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