Why is the CO2 concentration so erratic in the north?

[Mk]

0? latitude and north, the CO2 concentration over time goes from rather soft to erratic. What is responsible for this? Also, what is the mechanism in which CO2 concentration drops and rises every year?

 

[Bystander]

https://www.physicsforums.com/showthread.php?t=33370&page=4&highlight=Arctic

 

[Mk]

I understand about the CO2 release from freezing now, but why would it be so much more erratic (and opposite) than in the south?

 

[Bystander]

When it is winter in the Arctic, it is (what season, fill in blank) in the Antarctic? What are the areas of pack ice in the Arctic and Antarctic, and what is the ratio of those areas?