16 Jun 2022
16 Jun 2022
Status: a revised version of this preprint is currently under review for the journal ACP.

Sources of Concentric Gravity Waves Generated by a Moving Mesoscale Convective System in Southern Brazil

Prosper Kwamla Nyassor1, Cristiano Max Wrasse1, Igo Paulino2, Eliah F. M. T. São Sabbas3, José Valentine Bageston4, Kleber Pinheiro Naccarato5, Delano Gobbi1, Cosme Alexandre Oliveira Barros Figueiredo1, Toyese Tunde Ayorinde1, Hisao Takahashi1, and Diego Barros1 Prosper Kwamla Nyassor et al.
  • 1Space Weather Division, National Institute for Space Research (INPE), São José dos Campos - SP, Brazil
  • 2Department of Physics, Federal University of Campina Grande (UFCG), Campina Grande, PB, Brazil
  • 3Heliophysics, Planetary Science and Aeronomy Division, INPE, São José dos Campos - SP, Brazil
  • 4Southern Space Coordination, Santa Maria, National Institute for Space Research, RS, Brazil
  • 5Impacts, Adaptation and Vulnerabilities Division, INPE, São José dos Campos, SP, Brazil

Abstract. The studies on the sources of three concentric gravity waves (CGWs) excited by a moving Mesoscale Convective System (MCS) on the night of October 1 – 2, 2019 are investigated. These CGWs were observed using an OH all-sky imager whereas the MCS were observed by the Geostationary Operational Environmental Satellite (GOES). Using 2D spectral analysis, we observed that the CGWs have horizontal wavelength λH ∼30 – 55 km, phase speed cH ∼70 – 90 m/s, and period τ ∼7 – 12 min. By backward ray tracing we found that two of the waves were excited from convective cores within the MCS. We also found that the epicenters of the CGWs were close to the tropopause positions of the ray traced paths as well as the nearby convective cores. Regarding the source, we verified that on this night the cold-point tropopause (CPT) was ∼-80 °C, which was ∼10 °C cooler than CPT on the days preceding and after the MCS, and also colder than usually observed. Since the tropopause height and temperature are fundamental parameters underlying the analysis of the overshooting extent, we developed our own methodology to establish a reference tropopause that would enable a quantitative estimate of this parameter. Since the MCS (CGWs source) was moving, the overshooting convective cores were tracked in space and time. Finally, we found that two out of the three CGWs were excited by the MCS whereas the source of the remaining one was found not to be directly associated with the MCS.

Prosper Kwamla Nyassor et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-267', Anonymous Referee #2, 04 Jul 2022
  • RC2: 'Comment on acp-2022-267', Anonymous Referee #1, 11 Jul 2022

Prosper Kwamla Nyassor et al.

Video supplement

Mesoscale Convective System on October 1 - 2, 2019 Nyassor and Wrasse, 2022

Prosper Kwamla Nyassor et al.


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Short summary
This work investigates the sources of Concentric Gravity Waves (CGWs) excited by a moving system of clouds with several overshooting regions on October 1 – 2, 2019 at São Martinho da Serra. These wave parameters were estimated using 2D spectral analysis and their source locations identified using backward ray tracing. Furthermore, these wave sources were properly identified by tracking the individual overshooting regions in space and time since the system of clouds was moving.