#1 is the XB-24Q (44-9916) which was used to test the remote controlled guns for the B-47. (The array at the tail says it all) #2 is the EZB-24M (44-51228) used, as you guessed, for ice research. The last B-24 in USAF service, the EZB soldiered on until the 1950’s, was salvaged and put on display at Lackland AFB. It eventually wound up at the museum in Duxford, UK.
The Jive Bomber 