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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Aug 2020

13 Aug 2020

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This preprint is currently under review for the journal ANGEO.

Seasonal evolution of winds, atmospheric tides and Reynolds stress components in the Southern hemisphere mesosphere/lower thermosphere in 2019

Gunter Stober1, Diego Janches2, Vivien Matthias3, Dave Fritts4,5, John Marino6, Tracy Moffat-Griffin10, Kathrin Baumgarten7, Wonseok Lee8, Damian Murphy9, Yong Ha Kim8, Nicholas Mitchell11, and Scott Palo6 Gunter Stober et al.
  • 1Institute of Applied Physics & Oeschger Center for Climate Change Research, Microwave Physics, University of Bern, Bern, Switzerland
  • 2ITM Physics Laboratory, Mail Code 675, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • 3German Aerospace Centre (DLR), Institute for Solar-Terrestrial Physics, Neustrelitz, Germany
  • 4GATS, Boulder, CO, USA
  • 5Center for Space and Atmospheric Research, Embry-Riddle Aeronautical University, Daytona Beach, FL, USA
  • 6University of Colorado Boulder, Colorado, USA
  • 7Fraunhofer Institute for Computer Graphics Research IGD, Rostock, Germany
  • 8Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon 34134, South Korea
  • 9Australian Antarctic Division, Kingston, Tasmania, Australia
  • 10British Antarctic Survey, UK
  • 11University of Bath, Bath, UK

Abstract. In this study we explore the seasonal variability of the mean winds, diurnal, semidiurnal tidal amplitude and phases as well as the Reynolds stress components during 2019, utilizing meteor radars at six southern hemisphere locations ranging from from mid- to polar latitudes. These include Tierra del Fuego, King Edward Point on South Georgia island, King Sejong Station, Rothera, Davis and McMurdo stations. The year 2019 was exceptional in the southern hemisphere, due to the occurrence of a rare minor stratospheric warming in September. Our results show a substantial longitudinal and latitudinal seasonal variability of mean winds and tides pointing towards a wobbling and asymmetric polar vortex. Furthermore, the derived momentum fluxes and wind variances, utilizing a recently developed algorithm, reveal a characteristic seasonal pattern at each location included in this study. The longitudinal and latitudinal variability of vertical flux of zonal and meridional momentum is discussed in the context of polar vortex asymmetry, spatial and temporal variability, and the longitude and latitude dependence of the vertical propagation conditions of gravity waves. The horizontal momentum fluxes exhibit a rather consistent seasonal structure between the stations while the wind variances indicate a clear seasonal behaviour and altitude dependence showing the largest values at higher altitudes during the hemispheric winter and two variance minima during the equinoxes. Also the hemispheric summer mesopause and the zonal wind reversal can be identified in the wind variances.

Gunter Stober et al.

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Gunter Stober et al.

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