Seasonal Dependency of the Solar Cycle, QBO, and ENSO Effects on the Interannual Variability of the Wind DW1 in the MLT Region

The migrating diurnal tide (DW1) is derived by fitting Hough Mode Extensions to the TIMED/TIDI near‐global wind measurements within the mesosphere and lower thermosphere between 85 and 100 km from 2004 to 2014. The tidal amplitude peaks around the equinoxes with a large interannual variability of up...

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Bibliographic Details
Published in:Journal of geophysical research. Space physics 2024-08, Vol.129 (8), p.n/a
Main Authors: Wu, Chen, Ridley, Aaron J., Cullens, Chihoko Y.
Format: Article
Language:English
Subjects:
Amplitudes
Correlation coefficient
Correlation coefficients
Diurnal tides
El Nino
El Nino-Southern Oscillation event
ENSO
Equinoxes
Fittings
global wind measurements
Global winds
Hemispheres
Interannual variability
Lower thermosphere
Mesosphere
migrating diurnal tides within MLT
Polar vortex
QBO
Quasi-biennial oscillation
Seasonal variability
Solar cycle
Solar oscillations
Southern Oscillation
Spring
Spring (season)
Thermosphere
Tidal amplitude
Wind effects
Wind measurement
Winter
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Summary:The migrating diurnal tide (DW1) is derived by fitting Hough Mode Extensions to the TIMED/TIDI near‐global wind measurements within the mesosphere and lower thermosphere between 85 and 100 km from 2004 to 2014. The tidal amplitude peaks around the equinoxes with a large interannual variability of up to 50%. The correlation coefficients between the tidal amplitude variability and the solar cycle as represented by F10.7, stratospheric Quasi‐Biennial Oscillation (QBO), and El Niño‐Southern Oscillation (ENSO) are calculated every 10 days revealing seasonal dependencies. The interannual variability is positively correlated with QBO from spring to fall, maximizing around the equinoxes; anti‐correlated to the solar cycle in early winter; and anti‐correlated to ENSO in early winter and slightly in March. Multivariate linear regressions are performed to quantitatively analyze the linear relationships between the DW1 amplitude and those factors. The fittings perform best with the QBO at 30 and 50 hPa both being considered. The contribution of QBO peaks around January and October may be related to the polar vortex modulated by QBO in the northern and southern hemispheres, respectively. The correlation between the DW1 amplitude and ENSO is negative with time lags
ISSN:2169-9380
2169-9402
DOI:10.1029/2024JA032472