To preface, I am very new to wine. I am currently drinking Los Cardos, a 2006 Malbec. When I sniffed the wine with my glass full, I had a hard time picking up, or at least verbalizing, any particular smell. After I finished the glass I put it aside and then smelled the glass again a couple of hours later. Now, the smell I get is entirely different, and very arresting. I get caramel, butterscotch, maybe even butter or popcorn. Very definite smell, completely different from when I first sniffed the wine. I will also say that I tried the wine the next night again and could pick up those smells with the glass full, but I don't know if that's merely my subconscious playing tricks on me.
My question is this: is this an understood phenomena, that of the nose being so much more pronounced as residue in the glass, long after the wine is gone? If so, what is the word for it?