author = "Bageston, Jos{\'e} Valentin and Wrasse, Cristiano Max and 
                         Batista, Paulo Prado and E, Hibbins R and Fritts, David C. and 
                         Gobbi, Delano and Andrioli, V{\^a}nia F{\'a}tima",
          affiliation = "{} and VSE, Sao Jose Dos Campos, Brazil and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and Norwegian Univ Sci \& Technol, 
                         N-7034 Trondheim, Norway and Colorado Res Associates CoRA, 
                         Boulder, CO USA and {Instituto Nacional de Pesquisas Espaciais 
                title = "Observation of a mesospheric front in a dual duct over King George 
                         Island, Antarctica",
              journal = "Atmospheric Chemistry and Physics",
                 year = "2011",
               volume = "11",
               number = "23",
                pages = "12137--12147",
                 note = "{Setores de Atividade: Pesquisa e desenvolvimento 
             keywords = "gravity-wave event, airglow emissions, 62-degrees s, bore event, 
                         OH, climatology, atmosphere, campaign, station, region.",
             abstract = "A mesospheric front was observed with an all-sky airglow imager on 
                         the night of 9-10 July 2007 at Ferraz Station (62 degrees S, 58 
                         degrees W), located on King George island on the Antarctic 
                         Peninsula. The observed wave propagated from southwest to 
                         northeast with a well defined wave front and a series of crests 
                         behind the main front. The wave parameters were obtained via a 2-D 
                         Fourier transform of the imager data providing a horizontal 
                         wavelength of 33 km, an observed period of 6 min, and a horizontal 
                         phase speed of 92ms(-1). Simultaneous mesospheric winds were 
                         measured with a medium frequency (MF) radar at Rothera Station (68 
                         degrees S, 68 degrees W) and temperature profiles were obtained 
                         from the SABER instrument on the TIMED satellite. These wind and 
                         temperature profiles were used to estimate the propagation 
                         environment of the wave event. A wavelet technique was applied to 
                         the wind in the plane of wave propagation at the OH emission 
                         height spanning three days centered on the front event to define 
                         the dominant periodicities. Results revealed a dominance of 
                         near-inertial periods, and semi-diurnal and terdiurnal tides 
                         suggesting that the ducting structure enabling mesospheric front 
                         propagation occurred on large spatial scales. The observed tidal 
                         motions were used to reconstruct the winds employing a 
                         least-squares method, which were then compared to the observed 
                         ducting environment. Results suggest an important contribution of 
                         large-scale winds to the ducting structure, but with buoyancy 
                         frequency variations in the vertical also expected to be 
                         important. These results allow us to conclude that the wave front 
                         event was supported by a duct including contributions from both 
                         winds and temperature.",
                  doi = "10.5194/acp-11-12137-2011",
                  url = "http://dx.doi.org/10.5194/acp-11-12137-2011",
                 issn = "1680-7316",
                label = "lattes: 2306964700488382 3 BagestonWrBaEFrGoAn:2011:ObMeFr",
             language = "en",
           targetfile = "Bageston-acpd-11-16185-206-2011[1].pdf",
        urlaccessdate = "17 jan. 2021"