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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 15 Jul 2019

Submitted as: regular paper | 15 Jul 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Investigation of sources of gravity waves observed in the Brazilian Equatorial region on 08 April 2005

Oluwakemi Dare-Idowu1,2, Igo Paulino1, Cosme A. O. B. Figueiredo3, Amauri F. Medeiros1, Ricardo A. Buriti1, Ana Roberta Paulino1,4, and Cristiano M. Wrasse3 Oluwakemi Dare-Idowu et al.
  • 1Unidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande, 58429-900, Brazil
  • 2University of Paul Sabatier, Toulouse, 31330, France
  • 3Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, 12227-010, Brazil
  • 4Departamento de Física, Universidade Estadual da Paraíba, Campina Grande, 58429-500, Brazil

Abstract. On 08 April 2005, a strong gravity wave activity (more than 3 hours) was observed in São João do Cariri (7.4° S, 36.5° W). These waves propagated to the southeast and presented different spectral characteristics (wavelength, period and phase speed). Using OH airglow images, the parameters of 5 observed gravity waves were calculated; the wavelengths ranged from ~ 90 to 150 km, the periods from ~ 26 to 67 min and the phase speeds from 32 to 71 m/s. A reserve ray-tracing analysis was performed to investigate the likely sources of these waves. The ray-tracing database was composed of temperature profiles from NRLMSISE-00 model and SABER measurements and wind profiles from HWM-14 model and meteor radar data. According to the ray path, the likely source of these gravity waves was the Inter Tropical Convergence Zone with intense convective processes taking place in the northern part of the observatory. Also, the observed preferential propagation direction of the waves to the southeast could be explained using blocking diagrams, i.e., due to the wind filtering process.

Oluwakemi Dare-Idowu et al.
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Oluwakemi Dare-Idowu et al.
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Publications Copernicus
Short summary
This study presents the observation of 5 gravity waves detected over São João do Cariri, Brazil. Gravity waves which results from the displacement of the atmospheric fluids strongly influences fluid transport and turbulence in the upper atmosphere. Using OH airglow images, we spotted some gravity waves, obtained their characteristics, and employed the reverse ray-tracing technique to identify their sources which were traced to the convection processes in the Inter Tropical Convergence Zone.
This study presents the observation of 5 gravity waves detected over São João do Cariri,...