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I wonder whether a somewhat scrubbed exhaust could be piped into the bubble system.

The think the new Sir David Attenborough polar research ship has this feature (though I may be getting confused with a different vessel, an icebreaker I might have seen described on YouTube) https://www.bbc.co.uk/news/science-environment-54597767

Aside: The Sir David Attenborough carries the Boaty McBoatface AUV.

https://en.wikipedia.org/wiki/Boaty_McBoatface

I think bubblers are just common in icebreakers in general. It's because you want to reduce the friction between the ship and ice.

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