Gravity wave momentum fluxes in the MLT—Part II: Meteor radar investigations at high and midlatitudes in comparison with modeling studies

Placke, Manja; Hoffmann, Peter; Becker, Erich; Jacobi, Christoph; Singer, W.; Rapp, Markus

doi:10.1016/j.jastp.2010.05.007

Cited by 50 publications

(69 citation statements)

References 23 publications

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“…These results are similar to those found by us for middle latitudes, corresponding to SM and CP, the latter mainly in the meridional component of the variances. Placke et al (2011b) in their analysis of GW activity over Andenes (69.3 • N, 16 • E) and Juliusruh (54.6 • N, 13.4 • E) report SAO with maxima around the solstice. As stated earlier, annual and semiannual oscillations in GW activity are anticipated and have been documented in earlier work (e.g., Antonita et al,2008;Clemesha et al, 2009;Mitchell and Beldon, 2009;Beldon and Mitchell, 2009;Senft and Gardner, 1991;Placke et al, 2011b;De Wit et al, 2014b; and references therein); however, this appears to be the first report of a 4-month oscillation in GW momentum fluxes.…”

Section: Discussionmentioning

confidence: 96%

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

et al. 2015

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• W) were used to estimate the GW momentum fluxes and variances in the MLT region. Our analysis can provide monthly mean altitude profiles of vertical fluxes of horizontal momentum for short-period (less than 2-3 h) GWs. The averages for each month throughout the entire data series have shown different behavior for the momentum fluxes depending on latitude and component. The meridional component has almost the same behavior at the three sites, being positive (northward), for most part of the year. On the other hand, the zonal component shows different behavior at each location: it is positive for almost half the year at Cariri and SM but predominantly negative over CP. Annual variation in the GW momentum fluxes is present at all sites in the zonal component and also in SM at 89 km in the meridional component. The seasonal analysis has also shown a 4-month oscillation at 92.5 km over SM in the zonal component and over CP at the same altitudes but for the meridional component.

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Section: Discussionmentioning

confidence: 96%

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

et al. 2015

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“…There are several in situ (e.g., Eckermann and Vincent, 1989;Theuerkauf et al, 2011) and ground-based observation techniques like, e.g., meteor radars (e.g., Hocking, 2005;Fritts et al, 2010b, a;Placke et al, 2011), MF radars (e.g., Hoffmann et al, 2010Hoffmann et al, , 2011Placke et al, 2013), lidars (e.g., Rauthe et al, 2006;Gerding et al, 2008), airglow imagers (e.g., Nakamura et al, 1999;Pautet and Moreels, 2002;Suzuki et al, 2004Suzuki et al, , 2010 or CCD images of noctilucent clouds (NLC) (e.g., Pautet et al, 2011) as well as satelliteborne observations (e.g., Preusse et al, 2000;Ern et al, 2004Ern et al, , 2011 to quantify the properties of gravity waves and their effect on the background flow. Here we investigate short-period gravity waves using horizontally resolved radar observations.…”

Section: Introductionmentioning

confidence: 99%

Investigation of gravity waves using horizontally resolved radial velocity measurements

et al. 2013

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Abstract. The Middle Atmosphere Alomar Radar System (MAARSY) on the island of Andøya in Northern Norway (69.3 • N, 16.0 • E) observes polar mesospheric summer echoes (PMSE). These echoes are used as tracers of atmospheric dynamics to investigate the horizontal wind variability at high temporal and spatial resolution. MAARSY has the capability of pulse-to-pulse beam steering allowing for systematic scanning experiments to study the horizontal structure of the backscatterers as well as to measure the radial velocities for each beam direction. Here we present a method to retrieve gravity wave parameters from these horizontally resolved radial wind variations by applying velocity azimuth display and volume velocity processing. Based on the observations a detailed comparison of the two wind analysis techniques is carried out in order to determine the zonal and meridional wind as well as to measure first-order inhomogeneities. Further, we demonstrate the possibility to resolve the horizontal wave properties, e.g., horizontal wavelength, phase velocity and propagation direction. The robustness of the estimated gravity wave parameters is tested by a simple atmospheric model.

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“…its finite spatial correlation, and transient features) and subsequent simulation of the response to this of the typically large EBP distributions of the meteor technique. Placke et al (2011a) went a step further in this context by using a wind field output from a mechanistic model, but ultimately did not consider a realistic spatiotemporal distribution of meteors in sampling that wind field. In performing the simulations shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…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%

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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Gravity wave momentum fluxes in the MLT—Part II: Meteor radar investigations at high and midlatitudes in comparison with modeling studies

Cited by 50 publications

References 23 publications

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

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

Investigation of gravity waves using horizontally resolved radial velocity measurements

Mesospheric gravity wave momentum flux estimation using hybrid Doppler interferometry

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