@InProceedings{MitraGuhBatBurMof:2022:VaMLTi,
               author = "Mitra, Gourav and Guharay, Amitava and Batista, Paulo Prado and 
                         Buriti, Ricardo and Moffat-Griffin, Tracy",
          affiliation = "{Indian Institute of Technology Gandhinagar Physical Research 
                         Laboratory} and {Physical Research Laboratory} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal 
                         de Campina Grande (UFCG)} and {NERC British Antarctic Survey}",
                title = "Variability of the MLT Tides during September 2019 Minor Sudden 
                         Stratospheric Warming",
                 year = "2022",
         organization = "AGU Fall Meeting",
            publisher = "AGU",
             abstract = "Tidal variability in the mesosphere and lower thermosphere (MLT) 
                         during September 2019 Southern hemisphere minor sudden 
                         stratospheric warming (SSW) is investigated utilizing ground-based 
                         meteor radar wind observations from the equatorial, extratropical, 
                         middle, and high latitude stations and global reanalysis dataset. 
                         The polar warming is found to move from the mesosphere to the 
                         stratosphere until the peak warming day (PWD) of the SSW. The 
                         diurnal and semidiurnal tides at individual observational sites do 
                         not exhibit any consistent response during the observational 
                         interval, but a notable and consistent variability in some 
                         specific zonal wavenumber components, i.e., DW1 (migrating diurnal 
                         tide), DE3 (nonmigrating eastward wavenumber 3 diurnal tide), and 
                         SW2 (migrating semidiurnal tide) is found in the global reanalysis 
                         dataset. Incidentally, the warming event occurs during Spring 
                         equinox when a dominant seasonal change in the tidal activities 
                         generally takes place and hence seasonal variability is also 
                         obtained in the present work while identifying the SSW impact 
                         during the observational interval. It is found that the seasonal 
                         broad-scale changes in the DW1, DE3, and SW2 amplitudes can be 
                         explained by the variability in the tidal sources, i.e., water 
                         vapor, convective activity, ozone, etc during the observational 
                         period. However, the extracted small-scale variability in the 
                         global tidal modes on removing seasonal trend reveals noticeable 
                         response in connection with the warming event. The deseasoned 
                         amplitude of the DW1 significantly enhances around the PWD in most 
                         of the present latitudes. The deseasoned DE3 amplitude responds 
                         significantly in the middle atmosphere at low latitudes during the 
                         warming phase. The deseasoned SW2 exhibit clear enhancement around 
                         the PWD at all present latitudes. However, the deseasoned tidal 
                         features do not seem to correlate well with that of the source 
                         species unlike the seasonal ones that imply involvement of complex 
                         processes during the warming event, seeking further future 
                         investigations in this regard.",
  conference-location = "Chicago, IL",
      conference-year = "12-16 Dec. 2022",
        urlaccessdate = "04 maio 2024"
}