"That is interesting. Why would they throw the ATIS up on a tower frequency? When one controller closes a given frequency, the given norm is that the other person will assume control of that frequency (combine the frequency), broadcast on it, and anyone listening to that frequency will hear him, but pilots on the other frequency he is broadcasting on will not hear that one. That's what happens at least at KLAS. When 118.75 (Tower) closes, the other Tower (119.9) will combine all tower operations on his frequency. He'll broadcast on both 118.75 and 119.9. Anyone listening to him on 118.75 won't hear other pilots on 119.9, and vice versa, but both will hear the controller. Why LAX doesn't do that is weird, especially when they have 2 dedicated ATIS frequencies."
Your guess is as good as mine. What makes it most perplexing is that it is intermitent.
Rob