The Effects of Carbon 14 on the Date of Things

The different hemispheres of earth have different depositions of carbon 14. The north and the south hemisphere actually have totally separate independent wind systems that don't really mix very well. So there's less carbon 14 in the southern atmosphere because it's like more surface area of ocean which sucks up more carbon 14. There's more Carbon 14 in the northern hemisphere where there's less ocean surface. These all are really small effects and everybody wants really precise dating of things you know down to the decades.