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Ali Duffey

@aliduffey.bsky.social
299 followers 768 following 105 posts

Climate science | Stratospheric aerosol injection | Arctic climate change Senior Scientist at Reflective and visiting researcher at UCL

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Ali Duffey @aliduffey.bsky.social · 07/12/2025
Reading back through @eaterofsun.bsky.social 's The Planet Remade and thought this snippet about German involvement in geoengineering research was interesting. 10 years later the opposite seems true. On the other hand, the description of GeoMIP conferences fits the recent ones pretty well..
Excerpt from the book The Planet Remade stating that Germany is the country that has been spending the most money in solar geoengineering research
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Ali Duffey @aliduffey.bsky.social · 09/09/2025
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....
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Ali Duffey @aliduffey.bsky.social · 11/07/2025
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"
A long table summarising the main findings of the paper
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Ali Duffey @aliduffey.bsky.social · 16/06/2025
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Ali Duffey @aliduffey.bsky.social · 09/06/2025
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.
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Ali Duffey @aliduffey.bsky.social · 09/06/2025
Also take a look if you are an enthusiast for large numbers of subplots, i think the (w) here is my record.
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Ali Duffey @aliduffey.bsky.social · 09/06/2025
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.
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Ali Duffey @aliduffey.bsky.social · 17/05/2025
hosting it in Cape Town has its benefits too..
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Ali Duffey @aliduffey.bsky.social · 17/05/2025
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.
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Ali Duffey @aliduffey.bsky.social · 14/05/2025
A rare win for the UK government 🇬🇧
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Ali Duffey @aliduffey.bsky.social · 13/05/2025
Amanda Burson's Eco-Ice is under climate cooling
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Ali Duffey @aliduffey.bsky.social · 28/04/2025
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.
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Ali Duffey @aliduffey.bsky.social · 28/04/2025
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.
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Ali Duffey @aliduffey.bsky.social · 23/04/2025
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.
Cover of book "Climate change isn't everything" by Mike Hulme
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Ali Duffey @aliduffey.bsky.social · 09/04/2025
This sentence says a lot about the modern British state
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Ali Duffey @aliduffey.bsky.social · 28/02/2025
For anyone in Cambridge this evening and interested in hearing about solar geoengineering. The panel is full of very cool speakers (and also me)
Poster for a panel discussion event on engineering the climate at Clare College Cambridge, 6pm to 7.30 pm 28th February.
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