Why Arctic Ozone hole is rare compared to Antarctic

Ozone Hole?

 

▪️While ozone holes developing over the Antarctic every year are common during Southern Hemisphere spring, the conditions needed for such strong ozone depletion are not normally found in the Northern Hemisphere.  

▪️The Arctic stratosphere is usually less isolated than its Antarctic counterpart because the presence of nearby land masses and mountain ranges disturbs the weather patterns more than in the Southern Hemisphere.  

▪️This explains why the polar vortex in the Northern Hemisphere is usually weaker and more perturbed than in the Southern Hemisphere, and temperatures do not fall so low.  

▪️Arctic ozone hole is thus unusual in that we only have events like this about once per decade. On the contrary, the Antarctic ozone hole is being recorded annually over the last 35 years.