A Spectral Rotary Analysis of Gravity Waves: An Application During One of the SOUTHTRAC Flights

Torre, A. de la; Alexander, P.; Marcos, Tomás; Hierro, R.; Llamedo, P.; Hormaechea, José Luis; Preusse, Peter; Geldenhuys, Markus; Krasauskas, Lukas; Giez, Andreas; Kaifler, Bernd; Kaifler, Natalie; Rapp, Markus

doi:10.1029/2022jd037139

Cited by 3 publications

(7 citation statements)

References 57 publications

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“…This fact coincides with many aspects of the rotary spectral study on analysis data during ST08 by de la Torre et al. (2023). The presence of NOGW over the oceans in this region has already been highlighted by Hertzog et al.…”

Section: Results For St08supporting

confidence: 90%

“…Some results of the rotary spectral study on analysis data by de la Torre et al. (2023) and some outcomes of our work based on mesoscale simulations in the region and time of flight ST08 should be highlighted together. Their calculated upward GW energy flux is generally largest around the mountain zones and in some oceanic areas.…”

Section: Discussionmentioning

confidence: 71%

“…This work should be considered complementary to de la Torre et al. (2023). For a scenario with complex mixtures of packets of GW, the spectral method that they applied may be used in order to identify dominant wave aspects.…”

Section: Introductionmentioning

confidence: 57%

“…Or we might have no monochromatic mode but rather a packet. In the complementary work (de la Torre et al., 2023), it is shown through a spectral analysis in the flight area and time of ST08 that monochromatic waves are hardly found and rather bands around one or two dominant modes are detected.…”

Section: Results For St08mentioning

confidence: 98%

“…The synoptic conditions during the flight time and region have been discussed by de la Torre et al. (2023) and are briefly recalled here. Dörnbrack et al.…”

Section: Meteorological and Dynamic Conditions During Flight St08mentioning

confidence: 97%

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The Coexistence of Gravity Waves From Diverse Sources During a SOUTHTRAC Flight

et al. 2023

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Gravity waves (GWs) and the large-scale planetary waves and tides are the main drivers for the general circulation of the middle atmosphere. The primary sources of GW are topography, convection, fronts, instabilities, and spontaneous adjustment (e.g., Fritts & Alexander, 2003). GW constitute an important dynamical coupling mechanism between different regions and layers of the atmosphere by redistributing energy and momentum over

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Section: Results For St08supporting

confidence: 90%

Section: Discussionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 57%

Section: Results For St08mentioning

confidence: 98%

“…The synoptic conditions during the flight time and region have been discussed by de la Torre et al. (2023) and are briefly recalled here. Dörnbrack et al.…”

Section: Meteorological and Dynamic Conditions During Flight St08mentioning

confidence: 97%

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The Coexistence of Gravity Waves From Diverse Sources During a SOUTHTRAC Flight

et al. 2023

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The coexistence of gravity waves from diverse sources during a SOUTHTRAC flight

Alexander¹,

Torre

Llamedo

et al. 2022

Preprint

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Global Stratospheric Properties of Gravity Waves From 1 Year of Radio Occultations

Alexander,

de la Torre,

Schmidt

2024

JGR Atmospheres

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Gravity waves (GW) transport momentum flux (MF) and energy across the lower, middle and upper atmosphere. Global Navigation Satellite System (GNSS) radio occultation (RO) is one of the measuring techniques used onboard satellites to provide vertical temperature profiles with global and permanent coverage. These retrievals may be applied in the study of GW. Most of the analysis methods provide absolute GWMF but are missing its net direction. This happens because the procedures can deduce the orientation but not the propagation sign of GW and hence the full direction of MF. We apply here a method that allows the net calculation with four close in space and time RO soundings (quartets). We use about 10,000 daily retrievals from 1 March 2022 to 28 February 2023 to study the seasonal and latitudinal characteristics of net GWMF in the height interval from 20 to 35 km. About 600 quartets were found. The calculated zonal MF and drag exhibited negative minima at middle and high latitudes during winter in the Southern Hemisphere. This well‐known characteristic is usually mainly assigned to orographic sources. A similar intensity in zonal MF and drag is found during the same season at low latitudes. Meridional components are generally less significant. Besides finding the correct sign of the GWMF and the corresponding forcing on the mean flow, the quartets method also allows the determination of the horizontal and vertical wavelengths, the amplitude and sign of the vertical wave phase velocity and the intrinsic frequencies. The global statistics of these parameters are shown and each one exhibits a similar distribution shape across latitude bands. Large differences in the frequency of cases in vertical phase velocity sign appear only at low and high positive latitudes. The most even distribution of GW intrinsic frequency is found at low latitudes. We estimate that absolute MF calculations by methods assuming only upward GW propagation may produce a bias not larger than 40%. The increase of satellite measuring devices achieved in the last years due to the release of new missions led to a high spatial and temporal density of profiles that may allow the attainment of net GWMF climatologies over a seasonal time scale and about 4,000 km latitude bands but this performance may be even improved if the amount of retrievals continues to rise.

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A Spectral Rotary Analysis of Gravity Waves: An Application During One of the SOUTHTRAC Flights

Abstract: The complex structure inherent to frequently observed atmospheric gravity wave (GW) gatherings constitutes a challenge that remains difficult to address (e.g.,

Cited by 3 publications

References 57 publications

The Coexistence of Gravity Waves From Diverse Sources During a SOUTHTRAC Flight

The Coexistence of Gravity Waves From Diverse Sources During a SOUTHTRAC Flight

The coexistence of gravity waves from diverse sources during a SOUTHTRAC flight

Global Stratospheric Properties of Gravity Waves From 1 Year of Radio Occultations

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