@InProceedings{GomesBatiClemBuri:2015:MoFlMe,
               author = "Gomes, F{\'a}bio Egito and Batista, Paulo Prado and Clemesha, 
                         Barclay Robert and Buriti, Ricardo Arlen",
          affiliation = "{Universidade Federal do Oeste da Bahia (UFOB)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal de Campina 
                         Grande (UFCG)}",
                title = "Momentum flux and mean flow acceleration due to equatorial 
                         planetary scale waves",
                 year = "2015",
         organization = "Cospar Symposium, 2: Water and life in the universe",
             abstract = "In the equatorial MLT region planetary scale waves play an 
                         important role in the dynamics of this region as they act 
                         transporting momentum and energy from low to middle and upper 
                         atmosphere. The well known quasi-biennial (QBO), semiannual (SAO) 
                         and intraseasonal oscillations (ISO) have its generating 
                         mechanisms partially associated to the deposition of momentum by 
                         equatorial planetary scale waves. Among these, Kelvin waves are of 
                         particular interest. Kelvin waves propagate eastward and are 
                         characterized by presenting only zonal perturbations. They are 
                         observed in three distinct period bands: 10-20 day, 7-10 day and 
                         3-4 day. It is believed that they are generated by convective 
                         activity occurring in large scale convective complexes in the 
                         troposphere and then propagate upward. Its observed that only 3-4 
                         day Kelvin waves can reach the MLT between 80 and 100 km altitude. 
                         Quantifying the momentum transported by this wave and its effects 
                         toward the mean flow is then rather important to better understand 
                         the dynamic of the region. From a meteor radar installed in the 
                         Brazilian equatorial region at S{\~a}o Jo{\~a}o do Cariri 
                         (7.4°S, 36.5°W) tridimensional winds were calculated and used to 
                         direct calculating momentum flux transported by 3-4 day equatorial 
                         waves. The results show that vertical transport of 3-4 day zonal 
                         momentum flux is observed to be as much eastward as westward, but 
                         eastward transport is predominant. Largest values of momentum flux 
                         are observed near autumn equinox and minima before winter 
                         solstice. After winter solstice and during spring, momentum flux 
                         exhibits similar behavior. In a single event momentum flux due to 
                         3-4 day wave can reach over 20 m2s-2 and Its magnitudes estimated 
                         here are similar to those already reported in the literature. In 
                         additional, estimates of mean flow acceleration due to deposition 
                         of momentum flux by 3-4 day waves are under way and will be 
                         presented and discussed.",
  conference-location = "Foz do Igua{\c{c}}u, PR",
      conference-year = "9-13 Nov.",
        urlaccessdate = "27 abr. 2024"
}