Stratospheric Quasi Biennial Oscillation Modulations of Migrating Diurnal tide in the Mesosphere and Lower Thermosphere over the Low and Equatorial Latitudes

2021 ◽  
Author(s):  
Pramitha M ◽  
Kishore Kumar K ◽  
Venkat Ratnam M ◽  
Praveen M ◽  
Rao S Vijaya Bhaskara
Keyword(s):  
Lower Thermosphere ◽  
Diurnal Tide ◽  
Quasi Biennial Oscillation ◽  
Mesosphere And Lower Thermosphere ◽  
Biennial Oscillation

scholarly journals MIPAS observations of longitudinal oscillations in the mesosphere and the lower thermosphere: climatology of odd-parity daily frequency modes

2016 ◽  
Vol 16 (17) ◽  
pp. 11019-11041 ◽  
Author(s):  
Maya García-Comas ◽  
Francisco González-Galindo ◽  
Bernd Funke ◽  
Angela Gardini ◽  
Aythami Jurado-Navarro ◽  
...  
Keyword(s):  
Lower Thermosphere ◽  
Lower Boundary ◽  
High Latitudes ◽  
Quasi Biennial Oscillation ◽  
Propagating Waves ◽  
Daily Frequency ◽  
Mesosphere And Lower Thermosphere ◽  
Single Instrument ◽  
First Time ◽  
Biennial Oscillation

Abstract. MIPAS global Sun-synchronous observations are almost fixed in local time. Subtraction of the descending and ascending node measurements at each longitude only includes the longitudinal oscillations with odd daily frequencies nodd from the Sun's perspective at 10:00. Contributions from the background atmosphere, daily-invariant zonal oscillations and tidal modes with even-parity daily frequencies vanish. We have determined longitudinal oscillations in MIPAS temperature with nodd and wavenumber k = 0–4 from the stratosphere to 150 km from April 2007 to March 2012. To our knowledge, this is the first time zonal oscillations in temperature have been derived pole to pole in this altitude range from a single instrument. The major findings are the detection of (1) migrating tides at northern and southern high latitudes; (2) significant k = 1 activity at extratropical and high latitudes, particularly in the Southern Hemisphere; (3) k = 3 and k = 4 eastward-propagating waves that penetrate the lower thermosphere with a significantly larger vertical wavelength than in the mesosphere; and (4) a migrating tide quasi-biennial oscillation in the stratosphere, mesosphere and lower thermosphere. MIPAS global measurements of longitudinal oscillations are useful for testing tide modeling in the mesosphere and lower thermosphere region and as a lower boundary for models extending higher up in the atmosphere.

The wind regime of the mesosphere and lower thermosphere during the DYANA campaign—II. Semi-diurnal tide

1994 ◽  
Vol 56 (13-14) ◽  
pp. 1731-1752 ◽  
Author(s):  
Yu.I. Portnyagin ◽  
N.A. Makarov ◽  
R.P. Chebotarev ◽  
A.M. Nikonov ◽  
E.S. Kazimirovsky ◽  
...  
Keyword(s):  
Lower Thermosphere ◽  
Diurnal Tide ◽  
Wind Regime ◽  
Mesosphere And Lower Thermosphere

scholarly journals MF radar observations of the diurnal tide over Syowa, Antarctica (69° S, 40° E)

2009 ◽  
Vol 27 (7) ◽  
pp. 2653-2659 ◽  
Author(s):  
Y. Tomikawa ◽  
M. Tsutsumi
Keyword(s):  
Lower Thermosphere ◽  
Radar Data ◽  
Diurnal Tide ◽  
Syowa Station ◽  
Meridional Winds ◽  
Realistic Representation ◽  
Height Dependence ◽  
Mesosphere And Lower Thermosphere ◽  
The Antarctic ◽  
Mf Radar

Abstract. Characteristics of the diurnal tide in the Antarctic mesosphere and lower thermosphere (MLT) are investigated using 10 years of medium frequency (MF) radar data from Syowa Station (69° S, 39.6° E). Seasonal variations and height dependence of the diurnal amplitude and phase of zonal and meridional winds are mostly consistent with previous studies using the other Antarctic station data. The meridional momentum flux due to the diurnal tide shows a seasonal variation clearly different between above and below 90 km, which has never been reported in the literature. Finally, a cause of some discrepancy in the characteristics of the diurnal tide between the observation and simulation (i.e., GSWM-02) is discussed. It implies that the realistic representation of gravity waves in the simulation is crucial for realistic modeling of the diurnal tide.

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