Doppler-shifting Effects on Frequency Spectra of Gravity Waves Observed near the Summer Mesopause at High Latitude

Fritts, David C.; Wang, Ding-Yi

doi:10.1175/1520-0469(1991)048<1535:dseofs>2.0.co;2

Cited by 19 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A unique characteristic of SPB measurements is that they directly record the intrinsic frequency (

\overset{ω}{true}

) of atmospheric disturbances, i.e., the frequency felt by air parcels, in contrast with ground‐based instruments that measure frequencies affected by Doppler shift [see, e.g., Vincent and Eckermann , ; Fritts and Wang , ]. This is used below to obtain intrinsic frequency spectra of horizontal kinetic energy (

E_{k_{h}}

) and potential energy ( E p ) and to quantify the contributions from low‐frequency (planetary) and gravity waves.…”

Section: Intrinsic Frequency Spectra Of Atmospheric Motionsmentioning

confidence: 99%

Lagrangian temperature and vertical velocity fluctuations due to gravity waves in the lower stratosphere

Podglajen

Hertzog

Plougonven

et al. 2016

Geophysical Research Letters

179

View full text Add to dashboard Cite

Wave‐induced Lagrangian fluctuations of temperature and vertical velocity in the lower stratosphere are quantified using measurements from superpressure balloons (SPBs). Observations recorded every minute along SPB flights allow the whole gravity wave spectrum to be described and provide unprecedented information on both the intrinsic frequency spectrum and the probability distribution function of wave fluctuations. The data set has been collected during two campaigns coordinated by the French Space Agency in 2010, involving 19 balloons over Antarctica and 3 in the deep tropics. In both regions, the vertical velocity distributions depart significantly from a Gaussian behavior. Knowledge on such wave fluctuations is essential for modeling microphysical processes along Lagrangian trajectories. We propose a new simple parameterization that reproduces both the non‐Gaussian distribution of vertical velocities (or heating/cooling rates) and their observed intrinsic frequency spectrum.

show abstract

“…A unique characteristic of SPB measurements is that they directly record the intrinsic frequency (

\overset{ω}{true}

E_{k_{h}}

) and potential energy ( E p ) and to quantify the contributions from low‐frequency (planetary) and gravity waves.…”

Section: Intrinsic Frequency Spectra Of Atmospheric Motionsmentioning

confidence: 99%

Lagrangian temperature and vertical velocity fluctuations due to gravity waves in the lower stratosphere

Podglajen

Hertzog

Plougonven

et al. 2016

Geophysical Research Letters

179

View full text Add to dashboard Cite

show abstract

“…As (u) develops a strong vertical shear in a direction opposite to c, the intrinsic phase velocity grows in its magnitude and hence the wave variance. This is the effect of Doppler shifting on gravity wave variances as studied by Fritts and Wang [1991] and by A. H. Manson and coworkers [Manson et al, 1997[Manson et al, , 1999. For example, an anisotropic gravity wave spectrum with phase velocities in the westward direction will have variance enhancements at times or heights when the tide-induced wind speed reaches a maximum in the eastward direction.…”

Section: Observations and Data Analysismentioning

confidence: 99%

Mean winds, tides, and gravity waves during the westward phase of the mesopause semiannual oscillation (MSAO)

Gurubaran¹,

Rajaram²

2001

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract. MF radar observations of mean winds, tides, and gravity waves (in the period range 30-120 min) over Tirunelveli (8.7øN, 77.8øE) during April 1993, when the mesopause semiannual oscillation (MSAO) was in the westward phase, are presented in this work. The focus herein is on the observed relationship between these dynamical parameters, which is explained in the context of the current understanding of the behavior of MSAO winds, tidal dissipation, and gravity wave-tide interactions. The observed diurnal tide amplitude and phase variations with height indicate (1,1) wave damping and subsequent westward momentum deposition. The gravity wave variances are shown to be modulated by the diurnal tide. Though the analysis does not lead to an estimation of gravity wave contributions to the time-mean zonal flow and its shears, the observations do suggest that the short-term tidal variability contributes, either directly, or indirectly through the gravity wave-tidal interactions, to the variation of the strength of the time-mean westward flow associated with the MSAO.

show abstract

“…However, we also have constraints on the intrinsic frequency, that is, f _• w _• N, with the high-frequency limit relevant here. For many wave motions, it is also fair to guess that the observed frequency is less than the intrinsic frequency because higher-frequency waves most often propagate against the mean flow [Fritts and Wang, 1991] the same periodicity in the two coupled fields. What is more alarming is that vertical velocity maxima clearly precede or are aligned with temperature maxima at the same altitudes, in direct contradiction to expectations for near-adiabatic motions.…”

Section: Applications To Lidar Heat Fluxmentioning

confidence: 99%

Doppler-shifting Effects on Frequency Spectra of Gravity Waves Observed near the Summer Mesopause at High Latitude

Cited by 19 publications

References 0 publications

Lagrangian temperature and vertical velocity fluctuations due to gravity waves in the lower stratosphere

Lagrangian temperature and vertical velocity fluctuations due to gravity waves in the lower stratosphere

Mean winds, tides, and gravity waves during the westward phase of the mesopause semiannual oscillation (MSAO)

Errant inferences of gravity wave momentum and heat fluxes using airglow and lidar instrumentation: Corrections and cautions

Contact Info

Product

Resources

About