Comparison of the Dynamic Processes during Major and Minor Stratospheric Warmings In A Numerical Model.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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In this study we have analyzed the processes involved in a major and minor warming based on data generated from a 31-layer primitive equation spectral model consisting of a 5-layer troposphere, 12-layer stratosphere and 14-layer mesosphere. The forcing of the model consisted of orographic features designed to simulate the major Northern Hemisphere continents. This gave a combination of wave number 1 and wave number 2 forcing. The analysis of the simulated major and minor warmings indicated several similarities and differences between the cases. The initial difference between the cases is that case 1 major warming had a weak polar vortex, while case 2 minor warming had a strong polar vortex. This resulted in case 2 having much larger turbulent flux terms, but not sufficient to reverse the mean polar winds. Case 1 produces a major warming in the polar stratosphere.
- Atmospheric Physics
- Numerical Mathematics