Glass beads for sea-ice albedo modification has always been an implausible idea - here's me in 2023 writing as much. I welcomed the decision of the Arctic Ice project folks to wind down their activities.

www.arcticiceproject.org/the-project/

agupubs.onlinelibrary.wiley.com/doi/full/10....

BUT, once things are already tipped, SRM might not be able to get you back - we assessed "reversibiility" as ineffective or only partially effective for many important systems.

This shouldn't be surprising - this behaviour is part of what makes these things "tipping points"

The scariest plot in the paper is this one. The Arctic is rapidly heading towards a qualitatively different winter atmospheric state, in which strong stability near the surface no longer dominates.

Also take a look if you are an enthusiast for large numbers of subplots, i think the (w) here is my record.

This is Vasily Kanaki (left) and Igor Tsigelnitsky preparing a radiosonde at "North Pole 3" station in 1954. One of 1000s of radiosondes that contributed atmospheric profiles to our analysis.

hosting it in Cape Town has its benefits too..

I had a fantastic time this week at the Degrees Global Forum on SRM. The largest conference of its kind so far, and a real step forward in diversifying the conversation on solar geo.

Huge kudos to @degrees.ngo for pulling it off.

A rare win for the UK government 🇬🇧

Amanda Burson's Eco-Ice is under climate cooling

There is a trade-off between getting more sunlight (and more favourable circulation) at lower latitude, and being further above the tropopause at higher latitude.

We show that, at least in our model, this trade-off results in a change in the optimal latitude at about 14km.

A low-altitude injection strategy is therefore also a high-latitude one.

At every latitude, increasing the altitude increases the efficiency of SAI, meaning less injection would be needed to achieve a given cooling.

But, for a given altitude of injection, the optimal latitude is not trivial.

I really enjoyed this book. "Climate isn't everything" is often what I say when I'm trying to convince people that no, we shouldn't just start solar geoengineering tomorrow. Useful to see that argument carefully put forward.

This sentence says a lot about the modern British state

For anyone in Cambridge this evening and interested in hearing about solar geoengineering.

The panel is full of very cool speakers (and also me)