Hey wanna-be scientist... this might actually help your supposed global warming "theories" (surpressing laughter)
Take a fairly heavy nut. Place it on an ice block. Leave it.
Come back in a day.
What has it done.
Add to that 60 years of sunlight, and you have the reason why the P-38's and 1'17's sank as deep as they did. The crushing was due to movement.
I'm sorry, but you are very wrong.
Penetration depth of sunlight into hard packed snow and ice is about 10 feet....and only if the ice is exceptionally clear. Can you see the ground through 8" of snow? Greenland gets 3 meters a year. 9 ft, for the hard at math. In water, in clear tropical seas, 95% of the light spectrum is absorbed by 30 feet, leaving only the blue wavelength. You're trying to tell me that sunlight pierced hundreds of feet of solid ice and snow, to continually heat an aircraft's surface, and more importantly, it's base, to make it sink 300 feet? Wow, that's rich even for you sir.
Radiant heating of the aluminum bodies stopped within 2 weeks of them being on the ice. Those planes were covered, and thermally equal to the ice within a week or less. In case you're wondering, this is also why Glacier Girl was recovered in such good shape. The paint wasn't bubbled from thermal expansion and contraction of the plane's airframe, as a last negation of your idea.
The only thing you were right about was the moving.... about a mile in 50 years.