Polar Atmosphere Phenomena
: Focusing on the Polar Vortex
Problem
Problem_Stratosperic
① When the Vortex is Strong (Stable State)
A strong polar vortex keeps cold air contained, resulting in mild and stable winters in the mid-latitudes. However, this intense cooling in the stratosphere simultaneously accelerates the destruction of the Antarctic ozone hole.
② When the Vortex Weakens (The Cause of Cold Snaps)
When the polar vortex weakens, it triggers Sudden Stratospheric Warming (SSW). This event disrupts the Jet Stream, causing it to buckle and allow a massive outpouring of Arctic cold air into the mid-latitudes, resulting in extreme cold waves and heavy snow.
Problem_Troposperic
① When the Vortex is Strong (Stable Jet Stream)
A strong vortex maintains a large temperature contrast, making the Jet Stream fast and tight. This locks cold air in the north, leading to mild and stable winter weather in the mid-latitudes.
② When the Vortex Weakens (Wavy Jet Stream)
When the vortex weakens (due to Arctic Amplification), the Jet Stream becomes slow and wavy, meandering deeply southward. This leads to extreme cold waves and record-breaking snow in the mid-latitudes, increasing weather volatility.