Thanks for this question. At some point we will write a blog post to delve into the various research in detail. The short answer is that while there are some indications from computer model simulations that Arctic sea ice loss *by itself* can drive an equatorward shift of the jet stream and possibly a weaker polar vortex, in the real world and in model simulations with all the various aspects of climate change included, this response does not show up in any robust way. Likely there are other things going on that cancel this effect out. Moreover, we expect increased temperatures from a warming climate to at some point (if not already) to overwhelm any circulation/dynamically-driven cold air outbreaks. That doesn't mean that we can't still get record daily lows and very cold Arctic outbreaks, it just means that we will start to see fewer of them relative to daily record highs. And indeed, that is what has been happening (see for example Fig 2.4 here: https://nca2023.globalchange.gov/chapter/2/#key-message-2)