Case Studies on Concentric Gravity Waves Source Using Lightning Flash Rate, Brightness Temperature and Backward Ray Tracing at Sao Martinho da Serra (29.44 degrees S, 53.82 degrees W)

Autor(es)

Nyassor, P. K. ^[1] ; Wrasse, C. M. ^[1] ; Gobbi, D. ^[1] ; Paulino, I ^[2] ; Vadas, S. L. ^[3] ; Naccarato, K. P. ^[4] ; Takahashi, H. ^[1] ; Bageston, V, J. ; Figueiredo, C. A. O. B. ^[1] ; Barros, D. ^[1]

Afiliação do(s) autor(es)

^[1] Natl Inst Space Res, Space Weather Div, Sao Jose Dos Campos, SP - Brazil

^[2] Fed Univ Campina Grande UFCG, Dept Phys, Campina Grande, Paraiba - Brazil

^[3] NorthWest Res Associates Inc, Boulder, CO - USA

^[4] Natl Inst Space Res, Impacts Adaptat & Vulnerabil Div, Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES; v. 126, n. 10 MAY 27 2021.
• Citações Web of Science: 0

Resumo

We relate the spatial and temporal distribution of lightning flash rates and cloud top brightness temperature (CTBT) to concentric atmospheric gravity wave (CGW) events observed at the Southern Space Observatory (SSO) in Sao Martinho da Serra (29.44 degrees S, 53.82 degrees W, 488.7 m) in southern Brazil. The selected identified cases from 2017 to 2018 were observed by a hydroxyl (OH) all-sky imager. Backward ray tracing shows that the time of gravity wave excitation agrees with the highest values of lightning flash rates (indicating lightning jump) as well as the coldest brightness temperatures that indicate the time of convective overshoot. Radiosonde measurements show high convective available potential energy (CAPE), associated with a maximum updraft velocity just prior to the wave events. We find that these possible source locations correspond to the positions and times that convective plumes overshot the tropopause (seen in GOES-16 CTBT images). We also show that higher spatial lightning density (i.e., number of lightning flashes at a given longitude and latitude) agree with the overshoot locations from the GOES satellite. We also find that the overshoot times from the GOES-16 satellite agree with the times lightning jumps were observed in the lightning flash rate. Finally, we find that the periodicities in the lightning flash rate agree with the periods of the observed CGWs, which further strengthens the result that the CGWs were excited by the deep convective systems determined from backward ray tracing. (AU)

• Processo FAPESP: 18/09066-8 - Distúrbios ionosféricos propagantes observados sobre a cordilheira dos andes utilizando mapas/keogramas de conteúdo eletrônico total perturbado
• Beneficiário: Cosme Alexandre Oliveira Barros Figueiredo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado