@Article{NyassorWPSBNGFATS:2022:SoCoGr,
               author = "Nyassor, Prosper Kwamla and Wrasse, Cristiano Max and Paulino, Igo 
                         and S{\~a}o Sabbas, Eliah Fernanda de Maria de and Bageston, 
                         Jos{\'e} Valentin and Naccarato, Kleber Pinheiro and Gobbi, 
                         Delano and Figueiredo, Cosme Alexandre Oliveira Barros and 
                         Ayorinde, Toyese Tunde and Takahashi, Hisao and Silva, Diego 
                         Barros",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal 
                         de Campina Grande (UFCG)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Sources of Concentric Gravity Waves Generated by a Moving 
                         Mesoscale Convective System in Southern Brazi",
              journal = "Atmospheric Chemistry and Physics Discussions",
                 year = "2022",
               volume = "2022",
             keywords = "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 \λ,, , H \∼,, , 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.",
                  doi = "10.5194/acp-2022-267",
                  url = "http://dx.doi.org/10.5194/acp-2022-267",
                 issn = "1680-7367",
             language = "en",
           targetfile = "acp-2022-267.pdf",
        urlaccessdate = "27 abr. 2024"
}