HF Doppler Measurements of Mesospheric Gravity Wave Momentum Fluxes

Vincent, R. A.; Reid, Iain M.

doi:10.1175/1520-0469(1983)040<1321:hdmomg>2.0.co;2

Cited by 346 publications

(268 citation statements)

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“…ity wave field [Vincent and Reid, 1983;Fritts et al, 1990;Alexander and Pfister, 1995], others try to obtain information about the gravity wave activity from gravity-wave-induced perturbations of the wind and temperature fields. Radar winds have been analyzed in the lower and middle atmosphere at several locations, but the geographical coverage of these campaigns is rather sparse.…”

mentioning

confidence: 99%

Wavelet analysis of stratospheric gravity wave packets over Macquarie Island: 1. Wave parameters

Zink¹,

Vincent²

2001

J. Geophys. Res.

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Abstract. We describe a technique to detect gravity wave packets in high-resolution radiosonde soundings of horizontal wind and temperature. The vertical profiles of meridional and zonal wind speeds are transformed using the Morlet wavelet, and regions of high wind variance in height-wavenumber space are identified as gravity wave packets. Application of the Stokes parameter analysis to horizontal wind and temperature profiles of the reconstructed wave packets yields the wave parameters. The technique was applied to twice-daily radiosonde launches at Macquarie Island (55øS, 159øE) between 1993 and 1995. A strong seasonal cycle in the total wave variance was found, with a maximum in winter. The amount of wave energy propagating downward from the upper stratosphere also maximized in winter. Waves propagated predominately toward the southwest in winter, but in summer propagation directions were approximately isotropic. The intrinsic frequencies were close to the inertial frequency, and the waves had inferred horizontal wavelengths of several hundred kilometers.

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confidence: 99%

Wavelet analysis of stratospheric gravity wave packets over Macquarie Island: 1. Wave parameters

Zink¹,

Vincent²

2001

J. Geophys. Res.

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“…Vincent and Reid [1983] presented a method utilizing the dual beam technique to derive GW momentum flux with two beams pointed at equal and opposite angles θ from the zenith. The zonal momentum flux u ′ w ′ can then be derived from the following equation:…”

Section: Analysis Methodsmentioning

confidence: 99%

Sodium lidar‐observed gravity wave breaking followed by an upward propagation of sporadic sodium layer over Hefei, China

Ban

Fang

et al. 2015

JGR Space Physics

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The University of Science and Technology of China sodium temperature/wind lidar observed a strong zonal wind shear (~60 m/s/km) near 98 km between 1315 and 1330 UT on 29 July 2013 and a cooling near 96–100 km (above a warming near 90–95 km) between 1330 and 1430 UT. This suggests a possible gravity wave (GW) breaking event. Comparison of the lidar results with observations from a nearby meteor radar and with satellite results indicated that the GW likely broke down over a large horizontal area. In addition, the sodium number density suddenly increased 10–12 times (∼13, 000atm/cm3) near 95 km at 1400 UT, immediately following the GW breaking. This sporadic sodium layer (SSL), which is different from most previously observed SSL events (which propagate downward), tended to propagate upward and also appeared ~2 min earlier in the west channel than in the east channel. The horizontal propagation direction of the SSL was aligned with the horizontal wind direction, which was likely due to the propagation of a high‐density sodium layer from the northwest of the lidar site, and was possibly related to the earlier GW breaking event.

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“…Later, once coherent receiver systems were introduced, phase information became available, and Doppler-based and interferometric techniques became more common at MF (e.g., Vincent and Reid 1983;Adams et al 1986). The most sophisticated ultimate implementation of this was perhaps the development of the BPMF radar which included 30 independent phasecontrolled transmitters and 16 independent receivers, allowing great flexibility in experimental configurations (e.g., .…”

Section: Investigation Of Dynamics In the 50 To 100 Km Height Regionmentioning

confidence: 99%

“…To calculate these terms, three approaches were used. In the first, the mean aspect sensitivity was calculated and used to correct the apparent beam direction and the density normalized Reynolds stress terms u 0 2 ; v 0 2 ; w 0 2 ; u 0 w 0 ; v 0 w 0 ; u 0 v 0 were calculated using the approach of Vincent and Reid (1983) by fitting to all five beams. This results for this approach for the u′w′ and v′w′ terms are shown as the red line.…”

Section: Time Domain Interferometry (Tdi) and Hybrid Doppler Interfermentioning

confidence: 99%

“…18. The red line indicates these terms calculated by using the Vincent and Reid (1983) approach with the five nominal beam directions after correcting them for the aspect sensitivity of the atmosphere. The black line uses the radial velocities corresponding to each of the calculated 2 min effective beam positions and calculates the Reynolds stress tensor from these.…”

Section: Doppler Beam Swingingmentioning

confidence: 99%

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MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

Reid

2015

Prog. in Earth and Planet. Sci.

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The application of medium-frequency (MF) and high-frequency (HF) partial reflection radar to investigate the neutral upper atmosphere is one of the oldest such techniques still regularly in use. The techniques have been continuously improved and remain a robust and reliable method of obtaining wind velocities, turbulence intensities, electron densities, and measurements of atmospheric structure in the mesosphere lower thermosphere (MLT) region (50 to 110 km). In this paper, we review recent developments, discuss the strengths and weaknesses of the technique, and consider possible improvements.

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HF Doppler Measurements of Mesospheric Gravity Wave Momentum Fluxes

Cited by 346 publications

References 0 publications

Wavelet analysis of stratospheric gravity wave packets over Macquarie Island: 1. Wave parameters

Wavelet analysis of stratospheric gravity wave packets over Macquarie Island: 1. Wave parameters

Sodium lidar‐observed gravity wave breaking followed by an upward propagation of sporadic sodium layer over Hefei, China

MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

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