| Texto completo | |
| Autor(es): Mostrar menos - |
Nyassor, Prosper K.
;
Wrasse, Cristiano M.
;
Paulino, Igo
;
Sao Sabbas, Eliah F. M. T.
;
Bageston, Jose V.
;
Naccarato, Kleber P.
;
Gobbi, Delano
;
Figueiredo, Cosme A. O. B.
;
Ayorinde, Toyese T.
;
Takahashi, Hisao
;
Barros, Diego
Número total de Autores: 11
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Atmospheric Chemistry and Physics; v. 22, n. 23, p. 25-pg., 2022-11-29. |
| Resumo | |
The studies on the sources of three concentric gravity waves (CGWs) excited by a moving mesoscale convective system (MCS) on the night of 1-2 October 2019 are investigated. These CGWs were observed using a hydroxyl (OH) all-sky imager, whereas the MCS was observed by the Geostationary Operational Environmental Satellite (GOES). Using 2D spectral analysis, we observed that the three CGWs have horizontal wavelength lambda(H) between similar to 30-55 km, phase speed c(H) similar to 70-90 m s(-1), and period tau similar to 7-12 min Using backward ray tracing, we found that two of the CGWs were excited from convective cores within the MCS. We also found that the epicenters of the two waves were close to the tropopause positions of the ray-traced paths and nearby convective cores. Regarding the source, we verified that on this night the tropopause was similar to -80 degrees C, which was similar to 10 degrees C colder than 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. Using the tracking of the overshooting tops (OTs) in space and time with the aid of reverse ray tracing, we found that two out of the three CGWs were excited by the MCS, whereas the source of the remaining one was not directly associated with the MCS. (AU) | |
| Processo FAPESP: | 12/20366-7 - LEONA: rede colaborativa na América Latina para a investigação de eventos luminosos transientes e emissões de alta energia de tempestades |
| Beneficiário: | Eliah Fernanda de Maria de São Sabbas Tavares |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| 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 |
| Processo FAPESP: | 19/22548-4 - Fontes de distúrbios ionosféricos propagantes sobre a Cordilheira dos Andes |
| Beneficiário: | Cosme Alexandre Oliveira Barros Figueiredo |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |