Fabry‐Perot imaging observations of OH(8‐3): Rotational temperatures and gravity waves

Swenson, G. R.; Mende, S. B.; Geller, S. P.

doi:10.1029/ja095ia08p12251

Cited by 20 publications

(6 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hecht et al [1987] and Sivjee et al [ 1987] have reported a total of four observations of •1 for the OH emission, three of which (with phases close to zero) are only marginally compatible with our results, while one case is definitely not. The two values of •1 thatSwenson et al [1990] give for the period range above 1.5 hours, and the two values byOznovich et al [1995] are not completely irreconcilable with our data. However, the large zenith distances (60 ø and 65 ø , respectively) in these latter two observations may impair direct comparability: the HTS model implies that only for waves with horizontal pro3.5, plus one value of 7, with phases between 0 ø. and -30 ø, approximately, for 0 2.…”

contrasting

confidence: 61%

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O₂(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes

Reisin¹,

Scheer²

1996

J. Geophys. Res.

View full text Add to dashboard Cite

From about 100 nights of ground-based measurements of fluctuations in airglow brightness and rotational temperature, taken from two sites at 32øS and 37øN, a considerable number of new determinations of complex values of Krassovsky's •1 are derived, and compared with observations by othe• investigators and model predictions.Our findings support the model of HineS, Tarasick, and Shepherd (HTS), which leads to practical consequences regarding the usefulness of airglow observations for deriving vertical propagation of atmospheric waves in the mesopause region. It is shown, at least in part, that the vertical wave propagation can 'be inferred from zenith observations of one airglow emission, alone, and that consistent information can be obtained simultaneously for the two airglow layers. The analysis presented comprises the range of observed periods between 3 and 24 hours. The salient feature is that •1 values are essentially limited to the fourth quadrant, for both the 02 and OH emissions, which means, according to the HTS model, that the majority of the waves observed propagate upward, with vertical wavelengths between 20 and 60 km, and only a few are possibly evanescent. This would not contradict the interpretation that most if not all of the wave signatures may be due to the semidiurnal tide, or tidal transients. IntroductionThere is now general agreement that temporal variations of the airglow intensities and rotational temperatures are due to gravity waves passing through the rnesopause region. However, exactly how to extract dynamical information from airglow observations is far from clear. This is because a detailed quantitative description of how the airglow layers react to the passage of waves has not reached full consistency with observations. Existing models still disagree with each other in many respects, and the relatively few experimental results have not been sufficiently specific and consistent to show clearly if and how models should be improved.A key parameter is Krassovsky's rl, defined as the ratio of the relative amplitudes of the oscillations in airglow intensity and rotational temperature [Krassovsky, 1972]. This is nowadays taken to be complex. That is, it includes the phase shift between the intensity and temperature oscillations.According to the model of Hines, Tarasick, and Shepherd (HTS model) [Hines and Tarasick, 1987; Tarasick and Hines, 1990; Tarasick and Shepherd, 1992a, b], the imaginary part of rl gives information about the vertical propagation of gravity waves. Until now, however, this prediction has not been experimentally tested. The models of Walterscheid et al. [1987, 1994, and references therein] do not contain such a feature, at least explicitly. In two other models, by Zhang et al. [1993b], for the 0 2 emission, and by Makhlouf et al. [1995], for OH, it is also not clearly visible whether this feature is present. Several experimental determinations of rl have been more recently reported in the literature for the OH emission [Sivjee et al., 1987; Hecht et al., 1987; Swenson ...

show abstract

contrasting

confidence: 61%

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O₂(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes

Reisin¹,

Scheer²

1996

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…In the remainder of this section, we wish to begin comparing our model results against observations and other models. There exist in the literature several spectroscopic data sets for which Krassovsky ratios have been reported [Sivjee and Hamwey, 1987;Viereck and Deehr, 1989;Swenson et al, 1990;. One of the most interesting observations by at Sacramento Peak, New Mexico, showed a well-defined short-period, quasi-sinusoidal wave packet with an observed period of 13.7 min.…”

Section: Discussion and Comparison With Experiments And Other Modelsmentioning

confidence: 93%

Photochemical‐dynamical modeling of the measured response of airglow to gravity waves: 1. Basic model for OH airglow

Makhlouf¹,

Picard²,

Winick³

1995

J. Geophys. Res.

132

104

View full text Add to dashboard Cite

A photochemical‐dynamical model for the OH Meinel airglow is developed and used to study the fluctuations in OH emission due to atmospheric gravity waves propagating through the mesosphere. The linear response of the OH Meinel emission to gravity wave perturbations is calculated assuming realistic photochemistry and gravity wave dynamics satisfying Hines (1960) isothermal windless model. The current model differs from prior models in that it considers fluctuations in vibrationally excited hydroxyl populations [OH(ν)] instead of fluctuations in the production rate of OH(ν). Two types of correction terms to the latter class of models are found, one involving advection of excited‐state populations by the gravity wave and one involving quenching of OH(ν) by collisions with perturber molecules. Effects of these additional terms are expressed in terms of the so‐called Krassovsky ratio η, which relates relative fluctuations in the column intensity measured by a passive optical instrument to relative fluctuations in the ambient temperature. The extra wave advection term is found to be unimportant under typical conditions, but quenching is important and has two major effects: (1) It makes η a vibrational‐level‐dependent quantity, and (2) it can lower η by more than 50% depending on the wave period. A typical range for η over a reasonably chosen range of wave parameters was found to be from less than 1 up to 9. The measuring instrument was also explicitly considered in the model formulation. Instead of simply assuming that the instrument measured the brightness‐weighted temperature, as is commonly done in gravity wave response models, two common instruments for determining temperature from passive column‐integrated measurements were explicitly modeled. The instruments modeled consisted of (1) a moderate‐resolution instrument, such as a Michelson interferometer, which infers the temperature from the ratio of two rotational lines in a vibrational band (the rotational temperature) and (2) a high‐resolution instrument, such as a Fabry‐Pérot interferometer, which uses the Doppler width of a single line to infer the temperature (the Doppler temperature). For gravity waves with large phase velocity (large‐scale waves), calculations by both of these methods are found to be generally in agreement with each other and with the brightness‐weighted temperature. However, for gravity waves with small phase velocity (small‐scale waves) the two realistic simulations can differ from simulations using the brightness‐weighted temperature by as much as 35%. The effect of vertical standing waves is considered by modifying the Hines model to include a rigid ground boundary. It is found that the standing waves have a profound effect on the phase of the gravity wave response. Values of η generated from the model are compared with published ground‐based OH Meinel measurements of a quasi‐sinusoidal short‐period gravity wave by Taylor et al. (1991) from Sacramento Peak, New Mexico, at 15° elevation, as well as with the Svalbard polar‐night data of Vi...

show abstract

“…More recently, Swenson et al [1990] observed waves in the OH airglow temperature and brightness and compared the results to the calculations mentioned above. There were few data points and only limited agreement with any of the model calculations.…”

Section: Gravity Wavesmentioning

confidence: 96%

“…Mende et al [1988] described a technique, for measuring the spatial extent of gravity waves observed in the night airglow layer, which uses a photometric imaging etalon spectrometer. The technique was found to be successful and a report on gravity waves in the OH airglow was presented by Swenson et al [1990].…”

Section: Gravity Wavesmentioning

confidence: 99%

A Review of Mesospheric Dynamics and Chemistry

Viereck

1991

Reviews of Geophysics

View full text Add to dashboard Cite

Fabry‐Perot imaging observations of OH(8‐3): Rotational temperatures and gravity waves

Cited by 20 publications

References 51 publications

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O₂(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O₂(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes

Photochemical‐dynamical modeling of the measured response of airglow to gravity waves: 1. Basic model for OH airglow

A Review of Mesospheric Dynamics and Chemistry

Contact Info

Product

Resources

About

Fabry‐Perot imaging observations of OH(8‐3): Rotational temperatures and gravity waves

Cited by 20 publications

References 51 publications

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O2(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O2(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes

Photochemical‐dynamical modeling of the measured response of airglow to gravity waves: 1. Basic model for OH airglow

A Review of Mesospheric Dynamics and Chemistry

Contact Info

Product

Resources

About

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O₂(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes

Characteristics of atmospheric waves in the tidal period range derived from zenith observations of O₂(0–1) Atmospheric and OH(6‐2) airglow at lower midlatitudes