Spatial gravity wave characteristics obtained from multiple OH(3–1) airglow temperature time series

Wachter, Paul; Schmidt, Carsten; Wüst, Sabine; Bittner, Michael

doi:10.1016/j.jastp.2015.11.008

Cited by 24 publications

(42 citation statements)

References 40 publications

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“…The basic idea of the algorithm applied here for the calculation of horizontal wavelengths from a scanning GRIPS instrument is already mentioned in Wachter et al (2015). In contrast to their publication, we derive OH-temperatures for four instead of three FoV with one scanning GRIPS instrument instead of three individual (non-scanning) ones.…”

Section: Derivation Of 3d Wave Vectormentioning

confidence: 99%

“…OH-airglow spectroscopy however (e.g., Bittner et al, 2000;10 Mulligan et al, 1995), if it is based on only one vibrational OH* transition, can exclusively deliver wave periods. Wachter et al (2015) show that the combination of three airglow spectrometers measuring under different azimuth angles allows the additional derivation of horizontal wavelengths. Due to the setup of the three instruments, their fields of view (FoV) and the data analysis technique, the retrieved wavelengths lie mostly in the range of some 100 km, the addressed wave periods range from 1 to 14 h with a maximum between 2 and 4 h. Small-scale horizontal features in the order of some 10 km or even 15 turbulent structures like they are observed with OH* cameras as shown by Sedlak et al (2016) and Hannawald et al (2016) cannot be investigated based on this approach.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the 30 work of Wachter et al (2015), we construct a scanning OH* spectrometer (section 2.1) which allows the derivation of periods and zonal as well as meridional wavelengths (method: section 3.1, and results: section 4.1). We then use literature values of the Brunt-Väisälä frequency (see e.g.…”

Section: Introductionmentioning

confidence: 99%

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Derivation of horizontal and vertical wavelengths using a scanning OH(3-1) airglow spectrometer

Wüst

Offenwanger

Schmidt

et al. 2017

Preprint

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For the first time, we present an approach to derive zonal, meridional and vertical wavelengths as well as periods of gravity waves based on only one OH* spectrometer addressing one vibrational-rotational transition. Knowledge of these parameters 15 is a precondition for the calculation of further information such as the wave group velocity vector.OH(3-1) spectrometer measurements allow the analysis of gravity wave periods, but spatial information cannot necessarily be deduced. We use a scanning spectrometer and the harmonic analysis to derive horizontal wavelengths at the mesopause above Oberpfaffenhofen (48.09°N, 11.28°E), Germany for 22 nights in 2015. Based on the approximation of the dispersion relation for gravity waves of low and medium frequency and additional horizontal wind information, we calculate vertical 20 wavelengths afterwards. The mesopause wind measurements nearest to Oberpfaffenhofen are conducted at Collm (51.30°N, 13.02°E), Germany, ca. 380 km northeast of Oberfpaffenhofen by a meteor radar.In order to check our results, vertical temperature profiles of TIMED-SABER (Thermosphere Ionosphere Mesosphere Energetics Dynamics, Sounding of the Atmosphere using Broadband Emission Radiometry) overpasses are analysed with respect to the dominating vertical wavelength. 25Atmos. Meas. Tech. Discuss., https://doi

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Section: Derivation Of 3d Wave Vectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Derivation of horizontal and vertical wavelengths using a scanning OH(3-1) airglow spectrometer

Wüst

Offenwanger

Schmidt

et al. 2017

Preprint

Self Cite

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“…In addition, it is worth mentioning that in the current study we did not adopt high-pass filtering to extract the small-scale structures (e.g., Chandran et al, 2010) because 2-dimensional (2-D) filtering is prone to inducing notable artificial features if large and small scales are not separated optimally. Another important technique to detect gravity waves and to resolve their characteristics is applying a spatiotemporal analysis to either the ground-based or satellite measurements (e.g., Wachter et al, 2015;Ern et al, 2011). For example, Wachter et al (2015) applied such a technique to the OH airglow time series measured at the chosen triangular equilateral ground sites to yield a consistent set of wave parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Another important technique to detect gravity waves and to resolve their characteristics is applying a spatiotemporal analysis to either the ground-based or satellite measurements (e.g., Wachter et al, 2015;Ern et al, 2011). For example, Wachter et al (2015) applied such a technique to the OH airglow time series measured at the chosen triangular equilateral ground sites to yield a consistent set of wave parameters. In these analyses, however, a full display of the waves is not captured because only a few locations are used.…”

Section: Introductionmentioning

confidence: 99%

Universal power law of the gravity wave manifestation in the AIM CIPS polar mesospheric cloud images

et al. 2018

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Abstract. We aim to extract a universal law that governs the gravity wave manifestation in polar mesospheric clouds (PMCs). Gravity wave morphology and the clarity level of display vary throughout the wave population manifested by the PMC albedo data. Higher clarity refers to more distinct exhibition of the features, which often correspond to larger variances and a better-organized nature. A gravity wave tracking algorithm based on the continuous Morlet wavelet transform is applied to the PMC albedo data at 83 km altitude taken by the Aeronomy of Ice in the Mesosphere (AIM) Cloud Imaging and Particle Size (CIPS) instrument to obtain a large ensemble of the gravity wave detections. The horizontal wavelengths in the range of ∼ 20-60 km are the focus of the study. It shows that the albedo (wave) power statistically increases as the background gets brighter. We resample the wave detections to conform to a normal distribution to examine the wave morphology and display clarity beyond the cloud brightness impact. Sample cases are selected at the two tails and the peak of the normal distribution to represent the full set of wave detections. For these cases the albedo power spectra follow exponential decay toward smaller scales. The high-albedo-power category has the most rapid decay (i.e., exponent = −3.2) and corresponds to the most distinct wave display. The wave display becomes increasingly blurrier for the medium-and low-power categories, which hold the monotonically decreasing spectral exponents of −2.9 and −2.5, respectively. The majority of waves are straight waves whose clarity levels can collapse between the different brightness levels, but in the brighter background the wave signatures seem to exhibit mildly turbulentlike behavior.

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Gravity wave mixing effects on the OH*-layer

Becker

Grygalashvyly

Sonnemann

2020

Advances in Space Research

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Spatial gravity wave characteristics obtained from multiple OH(3–1) airglow temperature time series

Cited by 24 publications

References 40 publications

Derivation of horizontal and vertical wavelengths using a scanning OH(3-1) airglow spectrometer

Derivation of horizontal and vertical wavelengths using a scanning OH(3-1) airglow spectrometer

Universal power law of the gravity wave manifestation in the AIM CIPS polar mesospheric cloud images

Gravity wave mixing effects on the OH*-layer

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