Synopsis

Augustine Volcano in the Cook Inlet of Alaska 59N 153W erupts in December 2005. Explosive phase begins January 11 and last until January 28. USGS scientist use eruption on January 17 as a model for explosive phase, source mass flux 6.9e6 kg/s, plume rise 14km, VEI 3. Volcanic plume data at 300mb: density 0.446kg/m³, U (vertical wind) 70m/s, Z (geopotential height) 8849m, r (radius) 1447m, V (volume) 1.67E+10m³, KE (kinetic energy) 1.20E+15Joules, W (power) 9.64e13 watts,  ω (angular velocity) 1.800E-02 rads/s, ω² (vorticity) 1.674E-03. Event occurs NE of center of Aleutian Low. Baroclinic atmosphere created between surface and 300mb after explosion. Potential Vorticity Anomaly present within high pressure ridge aloft at 300mb. High vorticity of eruption causes a ripple in the Rossby waves. A deep trough results as cold air descends from ridge vertically and to the south as wind is deflected to the right (Coriolis effect) to conserve momentum. At bottom of trough vorticity is maximum, cyclones generated between cold Arctic air descending and warm Subtropical air ascending. Eruptions continue through January and cycle repeats itself generating cyclones and meridional jetstream prevails. At the end of January heat flux from subtropics breaks through Polar Vortex displacing it and Stratospheric Warming ensues.

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