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RISA Comparison of Seasonal Variations of Gravity Wave Intensity Observed by the MU Radar with a Theoretical Model
Publisher: American Meteorological Society
Abstract: A theoretical model of an ensemble of harmonics of internal gravity waves (IGWs) propagating from random sources in the atmosphere is used to explain the seasonal variations of IGW intensity observed at different altitudes ...
Simultaneous Observations of Thin Humidity Gradients in the Lower Troposphere with a Raman Lidar and the Very High-Frequency Middle- and Upper-Atmosphere Radar
Publisher: American Meteorological Society
Abstract: Humidity is, among other things, a key parameter in the evolution of atmospheric dynamics and in the formation of clouds and precipitation through latent heat release. The continuous observation of its vertical distribution ...
Validation of Winds Measured by MU Radar with GPS Radiosondes during the MUTSI Campaign
Publisher: American Meteorological Society
Abstract: For many years, mesosphere?stratosphere?troposphere (MST) radar techniques have been used for studying the structure and dynamics of the lower and middle atmosphere. In particular, these instruments are unique tools for ...
Strong Mixing Events Observed near the Tropopause with the MU Radar and High-Resolution Balloon Techniques
Publisher: American Meteorological Society
Abstract: In the present paper, strong isotropic radar echo enhancements are shown that are related to the existence of nearly statically neutralized layers (40?120 m thick) observed with high-resolution (10 cm) temperature measurements ...
High-Resolution Observations with MU Radar of a KH Instability Triggered by an Inertia–Gravity Wave in the Upper Part of a Jet Stream
Publisher: American Meteorological Society
Abstract: Kelvin?Helmholtz (KH) instability is likely one of the most important sources of clear-air turbulence in the lower atmosphere. It produces billows, which mix and transport heat and materials vertically in the stably ...
MST Radar Observations of a Saturated Gravity Wave Spectrum
Publisher: American Meteorological Society
Abstract: We present vertical wavenumber spectra of mesoscale wind fluctuations using data observed in the troposphere, lower stratosphere and mesosphere by the MU radar at 35°N in Japan in October 1986 and June 1987, as well as ...
A Comparison of VHF Radar Vertical-Velocity Measurements by a Direct Vertical-Beam Method and by a VAD Technique
Publisher: American Meteorological Society
Abstract: Vertical-velocity measurements made by a direct vertical-beam method are compared to vertical velocities derived from VAD (velocity-azimuth display) measurements over a 27-h period. The results indicate that the two types ...
Sea-Breeze Circulation over Jakarta, Indonesia: A Climatology Based on Boundary Layer Radar Observations
Publisher: American Meteorological Society
Abstract: Characteristics of sea-breeze circulation over the tropical site of Jakarta, Indonesia, have been documented based on analyses of satellite images and data from long-term L-band boundary layer radar measurements carried ...
Observations of a Reversal in Long-Term Average Vertical Velocities near the Jet Stream Wind Maximum
Publisher: American Meteorological Society
Abstract: Analysis of vertical velocity measurements made for four days each month over the period from 1986 to 1988 by the MU radar in Japan shows a reversal in direction near the peak in the zonal wind profile during the winter ...
Studies of Velocity Fluctuations in the Lower Atmosphere Using the MU Radar. Part I: Azimuthal Anisotropy
Publisher: American Meteorological Society
Abstract: We present in this paper a study of the azimuthal anisotropy of the motion field observed during a six-day campaign in March 1986 using the MU radar in Shigaraki, Japan. The radial wind velocity was observed at 20° zenith ...