A meteorologist with Environment Canada says a mysterious object which appeared to be hovering over an iceberg in Bonavista Bay isn't much of a mystery afterall.

YouTube user 235FireFly uploaded a video of icebergs spotted off Salvage this week.

"I noticed what appeared to be a chunk of ice just barely attached to an iceberg. Hoping to catch it collapse, I took out the camera and zoomed in," the user commented below the YouTube post.

"What you can see is a white object not attached to the iceberg, but rather spinning around and changing shape. There was no fog and it was a perfectly clear day so I'm up for debate. So any ideas what this could be? I'm open to all opinions, UFO, illusion or what? This is easily the strangest thing I have ever witnessed in my life."

Is it part of the iceberg? Is it fog playing tricks with your eyes?

None of the above, said Environment Canada's Rodney Barney.

"Mirage effect due to marine layer temperature inversion," Barney said via Twitter, shortly after the video was posted by CBC News.

Barney directed those curious to the Cliff Mass weather blog, which provides numerous examples of similar anomalies.

"They are dependent on the existence of large temperature differences (increases) above the surface ... with cold water near the surface chilling the surface air, and much warmer air above, resulting in a strong inversion," the blog states.

"Cold air near the surface is more dense than the warmer air above, and the change in densities create a lens-like effect in the atmosphere which produces the mirage."