Multi-year observations of gravity wave momentum fluxes at low and middle latitudes inferred by all-sky meteor radar

Andrioli, V. F.; Batista, P. P.; Clemesha, B. R.; Schuch, Nelson Jorge; Buriti, R. A.

doi:10.5194/angeo-33-1183-2015

Cited by 18 publications

(28 citation statements)

References 24 publications

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“…Interestingly, quasi‐4‐month oscillations with a maximum in July and secondary maxima in February and November in the meridional component are obviously observed at approximately 90 km over Mohe, Mengcheng, and Wuhan. Such an oscillation was also found at low latitudes in the Southern Hemisphere (Andrioli et al, ) as well as in mesospheric winds and temperature inferred from meteor radar and the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER; Das et al, ; Yi et al, ). The possible explanations of this oscillation will be discussed in the Discussion.…”

Section: Observational Resultsmentioning

confidence: 70%

“…Hocking (2005) introduced a new approach enabling GW momentum flux calculations in the MLT using meteor radar measurements, which has been distributed worldwide due to its comparatively modest size and cost, as well as its capability to obtain continuous measurements. Recently, this technique has been widely used to study momentum fluxes in high latitude (de Wit et al, 2015;Placke et al, 2015), midlatitude (Andrioli et al, 2015;de Wit et al, 2016;de Wit et al, 2017;Liu et al, 2013;Placke, Stober, & Jacobi, 2011), and tropical regions (Andrioli et al, 2015;Moss et al, 2016). Although the seasonal variations in GW momentum flux have been studied at various sites, their latitudinal variations in the MLT remain rare.…”

Section: Introductionmentioning

confidence: 99%

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Multiyear Observations of Gravity Wave Momentum Fluxes in the Midlatitude Mesosphere and Lower Thermosphere Region by Meteor Radar

Jia

Xue

et al. 2018

JGR Space Physics

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Multiyear high‐frequency gravity wave (GW) momentum fluxes and variances in the mesosphere and lower thermosphere region are revealed using four meteor radars along 120°E longitude at Northern Hemisphere midlatitudes for the first time, which are located at Mohe (53.5°N, 122.3°E), Beijing (40.3°N, 116.2°E), Mengcheng (33.3°N, 116.5°E), and Wuhan (30.5°N, 114.2°E), respectively. The seasonal and latitudinal variations of GW momentum fluxes in the midlatitude are discussed. The directions of the monthly mean zonal momentum fluxes are mostly against the background mean zonal winds, which agree well with the selective filtering mechanism. The seasonal variations of meridional momentum fluxes have similar trends over all four stations. The latitudinal variations in the seasonal variation of GW momentum fluxes are mainly due to the latitudinal variations of background winds and GW sources. The unexpected eastward momentum fluxes in winter over Beijing are likely caused by the secondary GWs propagating eastward from the source region over the Tibetan Plateau (25°–40°N, 70–100°E). The GW variances show a V‐shaped structure indicating annual and semiannual variations over four stations in zonal component. A quasi‐4‐month oscillation was observed over Mohe, Mengcheng, and Wuhan in meridional component. The background winds play decisive roles in these GW variance structures.

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Section: Observational Resultsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Multiyear Observations of Gravity Wave Momentum Fluxes in the Midlatitude Mesosphere and Lower Thermosphere Region by Meteor Radar

Jia

Xue

et al. 2018

JGR Space Physics

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“…By employing Hocking method, Placke et al (2015) estimated GW momentum fluxes and their annual variation over the Polar region and it is found that interannual variation is consistent during summer months. Andrioli et al (2015) introduced a modified composite day analysis and evaluated latitudinal variation of GW activity using three meteor radars, which exhibited considerable interannual variations. With the help of Monte Carlo analysis, Vincent et al (2010) reported that in order to obtain meaningful results from Hocking method, there should be considerable temporal averaging of the retrieved GW momentum fluxes.…”

Section: Introductionmentioning

confidence: 99%

Meteor Radar Estimations of Gravity Wave Momentum Fluxes: Evaluation Using Simulations and Observations Over Three Tropical Locations

Pramitha¹,

Kumar

Ratnam

et al. 2019

JGR Space Physics

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Meteor radars are widely used to study gravity wave (GW) variances and their momentum fluxes at the altitudes where meteor counts are sufficient to yield good statistical fits to the data. These radars provide hourly zonal and meridional wind observations round the clock in 80‐ to 100‐km height domain. However, the capability of meteor radars in estimating GW momentum fluxes should be evaluated before they can be used for any research applications. In this regard, the present study evaluates the meteor radar observations of GW momentum fluxes obtained from Thumba (8.5°N, 77°E; 2006–2015), Kototabang (0.2°S, 100.3°E; 2002–2017), and Tirupati (13.63°N, 79.4°E; 2013–2018) using three‐dimensional wind field simulations, which include specified tidal, planetary and GW fields. A modified composite day analysis is adopted to estimate the GW momentum fluxes, which also accounts for the tidal and planetary wave contributions. The results showed that the retrieved and specified GW momentum fluxes agree very well over Tirupati followed by Thumba and Kototabang. It is noted that the agreement between the retrieved and simulated fields depend on the number of meteor detections used in the analysis. After evaluating the meteor radar retrieved GW momentum fluxes by employing simulations, their interannual variability and climatologies over the three observational locations are constructed. The significance of the present study lies in evaluating the capability of three meteor radars located in equatorial and low‐latitudes in estimating GW momentum fluxes by employing three‐dimensional wind field simulations with specified mean winds, tidal, planetary, and GW fields.

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“…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). This has largely arisen from a need to obtain improved spatial coverage in the parameterization of GWs and their associated momentum transport in climate models of the whole atmosphere (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Fritts et al, 2010bFritts et al, , 2012a have opted to remove the temporal shear imposed by tides and planetary waves by fitting these components to the Cartesian winds, and then subtracting their radial projection from the radial velocities prior to momentum flux estimation. Andrioli et al (2013aAndrioli et al ( , b, 2015 also attempted to remove the same shears by fitting them, directly evaluating the contribution of the fitted components to the momentum fluxes, and then subtracting these from those estimated previously.…”

Section: Introductionmentioning

confidence: 99%

Mesospheric gravity wave momentum flux estimation using hybrid Doppler interferometry

Spargo¹,

MacKinnon²,

Holdsworth³

2017

Ann. Geophys.

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Abstract. Mesospheric gravity wave (GW) momentum flux estimates using data from multibeam Buckland Park MF radar (34.6 • S, 138.5 • E) experiments (conducted from July 1997 to June 1998) are presented. On transmission, five Doppler beams were symmetrically steered about the zenith (one zenith beam and four off-zenith beams in the cardinal directions). The received beams were analysed with hybrid Doppler interferometry (HDI) (Holdsworth and Reid, 1998), principally to determine the radial velocities of the effective scattering centres illuminated by the radar. The methodology of Thorsen et al. (1997), later re-introduced by Hocking (2005) and since extensively applied to meteor radar returns, was used to estimate components of Reynolds stress due to propagating GWs and/or turbulence in the radar resolution volume. Physically reasonable momentum flux estimates are derived from the Reynolds stress components, which are also verified using a simple radar model incorporating GW-induced wind perturbations. On the basis of these results, we recommend the intercomparison of momentum flux estimates between co-located meteor radars and verticalbeam interferometric MF radars. It is envisaged that such intercomparisons will assist with the clarification of recent concerns (e.g. Vincent et al., 2010) of the accuracy of the meteor radar technique.

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Multi-year observations of gravity wave momentum fluxes at low and middle latitudes inferred by all-sky meteor radar

Cited by 18 publications

References 24 publications

Multiyear Observations of Gravity Wave Momentum Fluxes in the Midlatitude Mesosphere and Lower Thermosphere Region by Meteor Radar

Multiyear Observations of Gravity Wave Momentum Fluxes in the Midlatitude Mesosphere and Lower Thermosphere Region by Meteor Radar

Meteor Radar Estimations of Gravity Wave Momentum Fluxes: Evaluation Using Simulations and Observations Over Three Tropical Locations

Mesospheric gravity wave momentum flux estimation using hybrid Doppler interferometry

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