Diurnal variation in gravity wave activity at low and middle latitudes

Andrioli, V. F.; Fritts, D. C.; Batista, P. P.; Clemesha, B. R.; Janches, Diego

doi:10.5194/angeo-31-2123-2013

Cited by 10 publications

(4 citation statements)

References 34 publications

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“…Tide perturbations play a crucial role in distributing atmospheric trace constituents (e.g., Ward, 1998), in modulating gravity wave (GW) fluxes (e.g., Andrioli et al, 2013;Beldon & Mitchell, 2010;Espy et al, 2004), and in the momentum budget of the lower thermosphere (e.g., Becker, 2017;Miyahara et al, 1993). Changes in the forcing conditions in the lower atmosphere, coupling between different meridional and zonal modes of the tide, tidal interactions with planetary waves (PWs) and/or GWs, and changes in the background atmosphere (through which the tide propagates) can all modulate the observed tidal amplitude over time (Riggin et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events

et al. 2019

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Using meteor wind data from the Super Dual Auroral Radar Network (SuperDARN) in the Northern Hemisphere, we (1) demonstrate that the migrating (Sun‐synchronous) tides can be separated from the nonmigrating components in the mesosphere and lower thermosphere (MLT) region and (2) use this to determine the response of the different components of the semidiurnal tide (SDT) to sudden stratospheric warming (SSW) conditions. The radars span a limited range of latitudes around 60°N and are located over nearly 180° of longitude. The migrating tide is extracted from the nonmigrating components observed in the meridional wind recorded from meteor ablation drift velocities around 95‐km altitude, and a 20‐year climatology of the different components is presented. The well‐documented late summer and wintertime maxima in the semidiurnal winds are shown to be due primarily to the migrating SDT, whereas during late autumn and spring the nonmigrating components are at least as strong as the migrating SDT. The robust behavior of the SDT components during SSWs is then examined by compositing 13 SSW events associated with an elevated stratopause recorded between 1995 and 2013. The migrating SDT is seen to reduce in amplitude immediately after SSW onset and then return anomalously strongly around 10–17 days after the SSW onset. We conclude that changes in the underlying wind direction play a role in modulating the tidal amplitude during the evolution of SSWs and that the enhancement in the midlatitude migrating SDT (previously reported in modeling studies) is observed in the MLT at least up to 60°N.

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Section: Introductionmentioning

confidence: 99%

SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events

et al. 2019

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“…In addition to seasonal variations, the high-frequency GWs also present the diurnal and semidiurnal variations. Andrioli et al [17] re-analyzed the previous data at Cariri (7 • S, 36 • W), Cachoeira Paulista (23 • S, 45 • W), Santa Maria (30 • S, 54 • W) and Southern Argentina Agile (53.8 • S, 67.8 • W) and found the diurnal and semidiurnal modulations on GWs variance over all sites. In addition, the semidiurnal modulation was observed at lower latitudes mainly near the equinoxes, while the diurnal modulation occurred mainly near the solstices.…”

Section: Introductionmentioning

confidence: 99%

Diurnal and Seasonal Variation of High-Frequency Gravity Waves at Mohe and Wuhan

Tang

Liu

et al. 2022

Atmosphere

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Using the meteor radar data at the Mohe (53.5° N, 122.3° E) and Wuhan (30.5° N, 114.2° E) regions over China, this paper conducts a study on the diurnal and seasonal variation of high-frequency (within 2 h) gravity waves (GWs) activity in the mesosphere and the lower thermosphere (MLT). On the basis of the composite day analysis and Hocking’s technique, the variance and momentum flux of the high-frequency GWs are derived from the radial velocities of individual meteor trails. Spectral results demonstrate that the high-frequency GWs activity shows 12 and 24 h periodicity, which may be due to the tidal modulation on the high-frequency GWs. The spectra of the variance and momentum flux also show 6 and 8 h periodicity. In addition to the diurnal variation, the high-frequency GWs activity shows the annual and semiannual oscillations. Additionally, the quasi-4-month oscillation is found at Mohe.

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“…In recent years, monostatic meteor radars have been the most widely deployed of those ground-based instruments (e.g. Hocking, 2005;Antonita et al, 2008;Clemesha and Batista, 2008;Mitchell, 2009, 2010;Clemesha et al, 2009;Fritts et al, 2010aFritts et al, , b, 2012aVincent et al, 2010;Placke et al, 2011aPlacke et al, , b, 2014Placke et al, , 2015Andrioli et al, 2013aAndrioli et al, , b, 2015Liu et al, 2013;de Wit et al, 2014bde Wit et al, , a, 2016Matsumoto et al, 2016;Riggin et al, 2016;Jia et al, 2018). This is largely due to the low cost and ease of installing and continuously running meteor radars relative to other instruments capable of making the same measurements, such as partial reflection radars (e.g.…”

Section: Introductionmentioning

confidence: 99%

Multistatic meteor radar observations of gravity-wave–tidal interaction over southern Australia

Spargo¹,

MacKinnon²

2019

Atmos. Meas. Tech.

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Abstract. This paper assesses the ability of a recently installed 55 MHz multistatic meteor radar to measure gravity-wave-driven momentum fluxes around the mesopause and applies it in a case study of measuring gravity wave forcing on the diurnal tide during a period following the autumnal equinox of 2018. The radar considered is in the vicinity of Adelaide, South Australia (34.9∘ S, 138.6∘ E), and consists of a monostatic radar and bistatic receiver separated by approximately 55 km. The assessment shows that the inclusion of the bistatic receiver reduces the relative uncertainty of the momentum flux estimate from about 75 % to 65 % (for a flux magnitude of ∼20 m2 s−2, 1 d's worth of integration, and for a gravity wave field synthesized from a realistic spectral model). This increase in precision appears to be entirely attributable to the increased number of meteor detections associated with the combined monostatic and bistatic receivers rather than changes in the meteors' spatial distribution. The case study reveals large modulations in the diurnal tidal amplitudes, with a maximum tidal amplitude of ∼50 m s−1 and an associated maximum zonal wind velocity of around 140 m s−1. While the observed gravity wave forcing exhibits a complex relationship with the tidal winds during this period, the components of the forcing are seen to be approximately out of phase with the tidal winds above 88 km. No clear phase relationship has been observed below 88 km.

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Diurnal variation in gravity wave activity at low and middle latitudes

Cited by 10 publications

References 34 publications

SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events

SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events

Diurnal and Seasonal Variation of High-Frequency Gravity Waves at Mohe and Wuhan

Multistatic meteor radar observations of gravity-wave–tidal interaction over southern Australia

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