Climatology is also a specialization in atmospheric science.
First you get a bachelor's degree in meteorology. You are now an atmospheric scientist.
To get a master's degree in atmospheric science you need to specialise in something, which could be climatology.
Even if so, it still is one out of how many that work or worked at NASA? The point remains, most of the opinions of the gentlemen above are as valid as your or mine. Which in the world of real science is well.... somewhere behind the janitor's opinion.
Ah yes, as far as I remember, climatologists working for the guv have at least a PhD. But sometimes things slip my attention.