Could freezing more water save Arctic sea ice?
There are a couple different ways to come at the problem of climate change—you can focus on eliminating the cause, or on mitigating the symptoms. The latter approach includes obvious things like preventing flooding from rising sea levels. But it also ranges into “geoengineering” schemes as radical as injecting sunlight-reflecting aerosol droplets into the stratosphere. Such schemes are band-aids rather than cures, but band-aids have their uses.
One worrying change driven by the climate is the loss of Arctic sea ice. The late-summer Arctic Ocean is on track to become ice-free around the 2030s. The rapid warming of the Arctic has serious implications for local ecosystems, but it also influences climate elsewhere in ways we’re still working to fully understand. One frequently mentioned effect is the increased absorption of sunlight in the Arctic as reflective snow and ice disappears—a positive feedback that amplifies warming.
What if we could slap a sea ice band-aid on the Arctic? In a recent paper, a group of Arizona State researchers led by astrophysicist Steven Desch sketch out one hypothetical band-aid—a geoengineering scheme to freeze more ice during the Arctic winter.