Simultaneous observations of mesospheric gravity waves with the MU radar and a sodium lidar

1996 ◽  
Vol 101 (D2) ◽  
pp. 4057-4063 ◽  
Author(s):  
S. P. Namboothiri ◽  
T. Tsuda ◽  
M. Tsutsumi ◽  
T. Nakamura ◽  
C. Nagasawa ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Mu Radar

scholarly journals VHF volume-imaging radar observation of aspect-sensitive scatterers tilted in mountain waves above a convective boundary layer

2005 ◽  
Vol 23 (4) ◽  
pp. 1139-1145 ◽  
Author(s):  
R. M. Worthington
Keyword(s):  
Gravity Waves ◽  
Air Flow ◽  
Horizontal Wind ◽  
Convective Boundary ◽  
Mountain Waves ◽  
Imaging Radar ◽  
Mu Radar ◽  
Volume Imaging ◽  
Wind Measurements ◽  
To Receive

Abstract. Thin stable atmospheric layers cause VHF radars to receive increased echo power from near zenith. Layers can be tilted from horizontal, for instance by gravity waves, and the direction of VHF "glinting" is measurable by spatial domain interferometry or many-beam Doppler beam swinging (DBS). This paper uses the Middle and Upper atmosphere (MU) radar, Shigaraki, Japan as a volume-imaging radar with 64-beam DBS, to show tilting of layers and air flow in mountain waves. Tilt of aspect-sensitive echo power from horizontal is nearly parallel to air flow, as assumed in earlier measurements of mountain-wave alignment. Vertical-wind measurements are self-consistent from different beam zenith angles, despite the combined effects of aspect sensitivity and horizontal-wind gradients.

scholarly journals Numerical and the MU radar estimations of gravity wave enhancement and turbulent ozone fluxes near the tropopause

2004 ◽  
Vol 22 (11) ◽  
pp. 3889-3898 ◽  
Author(s):  
N. M. Gavrilov ◽  
S. Fukao
Keyword(s):  
Gravity Waves ◽  
Wave Breaking ◽  
Internal Gravity Waves ◽  
Vertical Temperature ◽  
Turbulent Diffusion Coefficient ◽  
Middle Latitudes ◽  
Mu Radar ◽  
Different Seasons ◽  
Ozone Fluxes ◽  
Vertical Ozone

Abstract. It is shown with a numerical simulation that a sharp increase in the vertical temperature gradient and Brunt-Väisälä frequency near the tropopause may produce an increase in the amplitudes of internal gravity waves (IGWs) propagating upward from the troposphere, wave breaking and generation of stronger turbulence. This may enhance the transport of admixtures between the troposphere and stratosphere in the middle latitudes. Turbulent diffusion coefficient calculated numerically and measured with the MU radar are of 1-10m2/s in different seasons in Shigaraki, Japan (35° N, 136° E). These values lead to the estimation of vertical ozone flux from the stratosphere to the troposphere of (1-10)x1014, which may substantially add to the usually supposed ozone downward transport with the general atmospheric circulation. Therefore, local enhancements of IGW intensity and turbulence at tropospheric altitudes over mountains due to their orographic excitation and due to other wave sources may lead to the changes in tropospheric and total ozone over different regions.

Dominant vertical scales of gravity waves in the middle atmosphere observed with the MU radar and rocketsondes

1992 ◽  
Vol 54 (3-4) ◽  
pp. 339-346 ◽  
Author(s):  
Y Murayama ◽  
T Tsuda ◽  
M Yamamoto ◽  
T Nakamura ◽  
T Sato ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Middle Atmosphere ◽  
Mu Radar ◽  
Vertical Scales

Comparison of the mesospheric gravity waves observed with the MU Radar (35°N) and the Adelaide MF Radar (35°S)

1993 ◽  
Vol 20 (9) ◽  
pp. 803-806 ◽  
Author(s):  
T. Nakamura ◽  
T. Tsuda ◽  
S. Fukao ◽  
S. Kato ◽  
R. A. Vincent
Keyword(s):  
Gravity Waves ◽  
Mu Radar ◽  
Mf Radar

Characteristics of mesospheric internal gravity waves observed by MU Radar

1987 ◽  
Vol 14 (11) ◽  
pp. 1154-1157 ◽  
Author(s):  
Y. Muraoka ◽  
K. Kawahira ◽  
T. Sato ◽  
T. Tsuda ◽  
S. Fukao ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Internal Gravity Waves ◽  
Mu Radar
Sign in / Sign up

Export Citation Format

Share Document