Sudden stratospheric warming effects on the mesospheric tides and 2-day wave dynamics at 7°S

Lima, Lourivaldo Mota; Alves, E.O.; Batista, P. P.; Clemesha, B. R.; Medeiros, A. F.; Buriti, R. A.

doi:10.1016/j.jastp.2011.02.013

Cited by 45 publications

(40 citation statements)

References 44 publications

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“…In some cases the enhancement already starts at the end of the previous year, e.g., large amplitudes in December 2011 continue in January 2012. Several studies (e.g., Gu et al, 2013;Lima et al, 2012;McCormack et al, 2009) suggest a possible relation between QTDW amplitudes and the strong major sudden stratospheric warming in January 2006. The 2012 and 2013 maxima are also found during winters of major stratospheric warmings: however, during the 2009 stratospheric warming no QTDW enhancement is seen in the measurements.…”

Section: Resultsmentioning

confidence: 99%

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Lilienthal

Jacobi

2015

Atmos. Chem. Phys.

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Abstract. The quasi 2-day wave (QTDW) at 82-97 km altitude over Collm (51 • N, 13 • E) has been observed using a VHF meteor radar. The long-term mean amplitudes calculated using data between September 2004 and August 2014 show a strong summer maximum and a much weaker winter maximum. In summer, the meridional amplitude is slightly larger than the zonal one with about 15 m s −1 at 91 km height. Phase differences are slightly greater than 90 • on an average. The periods of the summer QTDW vary between 43 and 52 h during strong bursts, while in winter the periods tend to be more diffuse. On average, the summer QTDW is amplified after a maximum of zonal wind shear which is connected with the summer mesospheric jet and there is a possible correlation of the summer mean amplitudes with the background wind shear. QTDW amplitudes exhibit considerable inter-annual variability; however, a relationship between the 11-year solar cycle and the QTDW is not found.

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Section: Resultsmentioning

confidence: 99%

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Lilienthal

Jacobi

2015

Atmos. Chem. Phys.

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“…As seen above, the QTDW amplitudes presents interannual variability during the time in which they are more intense, namely in January- February that the MLT zonal wind dynamics had been impacted by interhemispheric penetration of energy from the winter hemisphere during this strong SSW event (Lima et al, 2012). However, the prevailing zonal wind over C. Paulista appears not to have been affected during 2003 and 2006 SSW events.…”

Section: Quasi-two-day Wave Amplitudesmentioning

confidence: 88%

Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S

Araújo¹,

Lima²,

Batista

et al. 2014

Ann. Geophys.

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Abstract. In this study we have used wind observation data from the mesosphere and lower thermosphere (MLT) region, obtained from meteor radar measurements in São João do Cariri . From the spectral analysis it was possible to identify the presence of planetary-scale oscillations in the hourly winds for the two latitudes and to study their transient character, which allowed elaboration of a climatology of planetary oscillation signatures. Planetary waves with periods near 2-days, 6-7 days, and 16 days were focussed on in this study. The quasi-2-day waves in the meteoric winds showed a seasonal cycle, with intense amplitudes occurring after the austral summer solstice and extending until the end of the season. The vertical wavelengths of the 2-day wave over Cachoeira Paulista were larger than those at São João do Cariri. A possible modulation of the quasi-2-day wave amplitudes by the quasi-biennial oscillation (QBO) has been observed only at São João do Cariri. The 6-7 day oscillations presented more intense amplitudes during August-November but were present with lower amplitudes during March-April at both sites. The 6-7 day vertical wavelengths over São João do Cariri were larger than at Cachoeira Paulista. The 6-7 day amplitudes exhibited intra-seasonal and annual behavior, however, there was no clear evidence of QBO modulation. The 16-day oscillations showed a seasonal cycle at São João do Cariri, with amplifications from austral spring to mid-summer and weaker amplitudes from autumn until early winter, however, there was no clear seasonality over Cachoeira Paulista. The 16-day vertical wavelengths have assumed values of λ z ∼ 45-85 km over both sites. 16-day wave amplitudes at the two sites showed different long-term behaviors.

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“…warming (SSW) occurs, background zonal wind changes and the QTDW forcing in both the tropical and extratropical regions may be influenced (McCormack et al, 2009;Lima et al, 2012). Recently, research has reported that QTDWs can be modulated by low-frequency oscillations of the atmosphere, such as the quasi-biennial oscillation (QBO) in equatorial zonal wind (Li et al, 2008) and solar activities (Jacobi et al, 1997), and yield interannual variations of QTDWs.…”

Section: Y Y Huang Et Al: Global Climatological Variability Of Quamentioning

confidence: 99%

Global climatological variability of quasi-two-day waves revealed by TIMED/SABER observations

et al. 2013

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This paper presents characteristics of quasi-two-day waves (QTDWs) in the mesosphere and lower thermosphere (MLT) between 52° S and 52° N from 2002 to 2011 using TIMED/SABER temperature data. Spectral analysis suggests that dominant QTDW components at mid-high latitudes of the Southern Hemisphere (SH) and the Northern Hemisphere (NH) are (2.13, W3) and (2.04, W4), respectively. The most remarkable QTDW is (2.13, W3), which happened in the southern summer of 2002–2003 at 32° S from 60 to 90 km in altitude. Its downward phase propagation indicates upward propagation of the wave energy and a potential source region below 60 km. Analysis of horizontal wind fields in the same period shows the westward and southward propagation of (2.13, W3) and a possible reflection region above 90 km. Fundamental parameters of QTDWs present significant interhemispheric differences and interannual variations in statistical analysis. Amplitudes in the SH are twice larger than that in the NH, and vertical wavelengths are a little longer in the SH. QTDWs may endure stronger dissipation in southern summer because of shorter durations of their attenuation stages. Impact of the equatorial quasi-biennial-oscillation (QBO) on QTDWs can extend to mid-high latitudes of both hemispheres. It seems easier for QTDWs to propagate upward in the equatorial QBO's westerly phase in the lower stratosphere and easterly phase in the middle stratosphere. Interannual variations of QTDW strength may be influenced by solar activity as well. Strengths of QTDWs appear to be stronger (weaker) in the solar maximum (minimum)

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Sudden stratospheric warming effects on the mesospheric tides and 2-day wave dynamics at 7°S

Cited by 45 publications

References 44 publications

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S

Global climatological variability of quasi-two-day waves revealed by TIMED/SABER observations

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