4.2 Article

Migrating solar diurnal tidal variability during Northern and Southern Hemisphere Sudden Stratospheric Warmings

Journal

EARTH PLANETS AND SPACE
Volume 74, Issue 1, Pages -

Publisher

SPRINGER
DOI: 10.1186/s40623-022-01661-y

Keywords

SSW; Migrating solar tide; Mesosphere-lower thermosphere (MLT); Atmospheric coupling

Funding

  1. Alexander von Humboldt Foundation
  2. Deutsche Forschungsgemeinschaft [1428/1-2]
  3. Projekt DEAL

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This study investigates the variability of the migrating solar diurnal (DW1) tide in the mesosphere-lower thermosphere (MLT) region during Northern and Southern Hemisphere Sudden Stratospheric Warmings (SSWs) using temperature observations and simulations. The DW1 tide displays a reduction in amplitude at low-latitudes after the onset of SSWs in both observations and simulations. The simulations suggest that changes in the latitudinal shear of zonal winds in the MLT during SSWs could explain the observed variability of the DW1 tide.
In this study, the variability of the migrating solar diurnal (DW1) tide in the mesosphere-lower thermosphere (MLT) region during Northern and Southern Hemisphere (NH &SH) Sudden Stratospheric Warmings (SSWs) is investigated using Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature observations and reanalysis-driven Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM-X) simulations. The periods examined include four major NH SSWs that occurred in 2006, 2009, 2010 and 2013 and two SH SSWs that were observed in 2002 and 2019. Our analysis shows that the DW1 tide in both observations and simulations displays a reduction of amplitude at low-latitudes after the onset of NH and SH SSWs. As WACCM-X simulations qualitatively reproduce this feature of DW1 tidal variability common to both NH and SH SSWs, they have been used to examine the possible mechanism that could explain these observations in the DW1 tide. It is known that changes in the latitudinal shear of zonal winds at low-latitudes strongly affect the seasonal variation of the DW1 tide in the MLT. We show that SSW-associated changes in the latitudinal shear in the MLT could explain the observed variability of the DW1 tide during NH and SH SSWs.

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