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Abstract:
Sudden stratospheric warming (SSW) events have a significant impact on stratospheric ozone in the Arctic region. This study uses GROMOS-C radiometer measurements and MERRA-2 data, and Aura-MLS observations to investigate the ozone variability over Svalbard (79°N, 12°E) for SSW events between 2016 and 2022 and examines the potential role of stratospheric ozone in connection to the mesospheric tides enhancement of the migrating semidiurnal (SW2) tide reported for such events.
GROMOS-C measurements show good agreement with MERRA-2 simulation and Aura-MLS observations in the middle stratosphere during highly altered dynamics of SSW. Here we focus on the stratospheric ozone anomaly associated with the onset of a major SSW at polar latitudes.
Furthermore, we extract the mesospheric semi-diurnal tide (SDT) and diurnal tide (DT) observed in the zonal and meridional winds recorded by a nearby meteor radar over Svalbard (79°N, 12°E). We analyze the anomaly variations in stratospheric ozone and the behavior of SDT during a series of that occurred between 2016 and 2022. We also characterized the SSW events according to their dynamical signature (vortex splitting or displacement) and strength (major or minor).
The results of this study suggest a connection between changes in stratospheric ozone and the underlying circulation that also impacts the tidal propagation up to the mesosphere, particularly, the SDT during SSWs, indicating that together with the radiative forcing may play a significant role in driving mesospheric tides.
