The year-to-year variability of the autumn transition dates in the mesosphere/lower thermosphere wind regime and its coupling with the dynamics of the stratosphere and troposphere

Merzlyakov, E. G.; Jacobi, Ch.; Solovjova, T.V.

doi:10.1016/j.jastp.2014.11.002

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…In former studies about relations between QBO and long-term variations of atmospheric waves, QBO phases are usually defined by zonal wind directions at a single pressure level, mostly at 50 hPa (Holton and Tan, 1980;Merzlyakov et al, 2013;Merzlyakov et al, 2015;de Wit et al, 2016;Laskar et al, 2016), or the vertical shear of QBO wind, e.g., between 70 hPa and 10 hPa (Miyoshi and Hirooka, 2003). Moreover, most of these results are qualitatively.…”

Section: Discussionmentioning

confidence: 99%

Inter-annual variations of 6.5-day planetary waves and their relations with QBO

Huang¹,

Cui²,

Li³

et al. 2022

Earth and Planetary Physics

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This paper studies inter-annual variations of 6.5-Day Waves (6.5DWs) in 20−110 km between 52°S−52°N during March 2002−January 2021 and their relations with equatorial stratospheric Quasi-Biennial Oscillation (QBO). 6.5DWs' amplitudes in temperature are calculated based on SABER/TIMED observations. QBO zonal winds are obtained from ERA5 reanalysis dataset. QBO phases are derived from Empirical Orthogonal Functions (EOF) method. Wavelet analysis of 6.5DW variations demonstrates obvious spectral maximums around 28−38 months in 32°−52°N and 26−30 months in 32°−52°S. In the Northern Hemisphere, peak periods get longer poleward, while they remain unchanged with latitude in the Southern Hemisphere.Residual 6.5DWs' amplitudes are calculated by removing composite amplitudes from 6.5DWs' amplitudes.Comparisons between QBO and the monthly maximum residual 6.5DWs' amplitudes (𝐴𝐴 Mmax ) show clear relations between QBO and 6.5DWs in both hemispheres, especially in the NH. When 𝐴𝐴 Mmax is large in the NH, mean QBO profile is easterly at all levels from 70 to 5 hPa. When it's weak, mean QBO wind is weak westerly below 30 hPa. Linear Pearson correlation coefficients between QBO phases and 𝐴𝐴 Mmax show large positive values in 60−110 km between 20°−52°N in April and around 64 km at 24°S in February, and large negative values from 80 to 110 km between 20°N−50°N in August and at 96−106 km between 20°S−44°S in February. These results indicate quantitative relations between QBO and 6.5DWs and provide credible evidences for further studies of QBO modulations on long-term variations of 6.5DWs.

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