I can't find a date on either of these, but they look a bit dated. The newest reference in the presenetation is from 2007 and uses graphs from 2001.

I know that I heard something aout CO2 taking 20 years to get to the upper atmosphere around then, too, but not since, and I remember being curious about that and researching it a bit about a decade ago and finding that this is not what most atmospheric scientists believed (anymore?).