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Area of Science:

  • Atmospheric Science
  • Meteorology
  • Climate Dynamics

Background:

  • Extreme polar vortex events, known as sudden stratospheric warmings (SSWs), significantly impact surface winter weather.
  • Predicting the timing and occurrence of SSWs remains a challenge for seasonal forecasting.

Purpose of the Study:

  • To investigate the factors influencing the occurrence and timing of SSWs.
  • To identify key regions and atmospheric processes critical for accurate SSW prediction.

Main Methods:

  • Analysis of a specific split vortex event in January 2009.
  • Utilizing atmospheric modeling with constrained conditions in the troposphere and equatorial stratosphere.
  • Comparing model outputs with and without constraints in different stratospheric regions.

Main Results:

  • Constraining only the troposphere and lower equatorial stratosphere was insufficient to reproduce the observed SSW event.
  • Including constraints on the upper equatorial stratosphere accurately captured the timing and spatial evolution of the vortex event.
  • This indicates a previously underappreciated influence of the upper equatorial stratosphere on SSWs.

Conclusions:

  • The upper equatorial stratosphere plays a crucial role in the development and timing of extreme polar vortex events.
  • Improved representation of upper equatorial stratospheric dynamics is essential for enhancing the predictability of SSWs.
  • Better SSW predictability can lead to improved forecasts of associated surface winter weather impacts.