Dan Visioni
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danvisioni.bsky.social
Dan Visioni
@danvisioni.bsky.social
Climate scientist studying aerosols, chemistry, radiation, climate & society from Volcanoes 🌋and Climate Intervention. Assistant Professor at Cornell EAS, from 🇮🇹proudly🏳️‍🌈 More at https://dan-visioni.github.io/ and https://www.wcrp-climate.org/ci-overview
The frequency of the electromagnetic radiation is proportional to the temperature of the emitting body through Wien’s displacement law, which explains why the sunlight spectrum is in the (for us) visible range and Earth’s thermal is ooms shifted to the right.
January 28, 2026 at 1:23 PM
If you can explain global warming *without* black body radiation, that’s a pretty phenomenal feat.
January 28, 2026 at 12:44 PM
This is really colossal nitpicking, because yes, by all possible physical perspectives thermal emissions from a body at 300K, compared to the light of the Sun, is “cold”. I’ve used the same exact example to explain Earth’s balance in my climate dynamics class for years,
January 28, 2026 at 12:43 PM
Congratulations Robert :)
January 28, 2026 at 12:45 AM
Sorry, the star is actually on BlueSky so I can tag her @cindiles625.bsky.social :)
January 27, 2026 at 6:40 PM
Also this is Cindy's first paper in our group, which she joined last February, so happy anniversary, Cindy! She's an incredible researcher, and has so much stuff she's working on for the future!
January 27, 2026 at 5:10 PM
...and hopefully more detailed studies further down the line can help identify missing pieces. In our paper, we highlight what we think are the aspects where we think the response we find is robust, discussing CESM capabilities, and where there are margins for improvements (nitrogen, dust, etc.).
January 27, 2026 at 5:10 PM
Main finding is that, overall, these feedback balance out and result in changes that are independent of injection rates: if you aim to cool more, you don't end up with worse or better health outcomes (but regionally this varies). Air quality is complicated and not always fully represented in ESMs...
January 27, 2026 at 5:10 PM
We looked at various drivers, including cooling-driven surface O3 changes, drivers of changes in particulate matter, and internal variability, combined with up to date exposure–response functions to understand the ultimate impacts.
January 27, 2026 at 5:10 PM
Reposted by Dan Visioni
we are going to win
January 25, 2026 at 9:37 PM
January 25, 2026 at 9:27 PM
Yeah actually it feels like now the most hurtful thing to the regime European countries could do is boycott the World Cup. Otherwise it will be remembered-and everyone will be remembered- just like the Berlin Olympic Games.
January 25, 2026 at 1:15 AM
I’m angry at Italy too, a sycophantic country who can’t stop kissing Trump’s ass because they share the same fascist goals and xenophobia, just with the cowardice bumped up to 11 (just like the 1920s).

All will be remembered in deep, deep shame, for the hurt they enabled.
January 25, 2026 at 12:33 AM
Thanks Andrew :) We have the CESM winter meeting in 8 days, so I hope to get more clarity in person about what the best next steps are, plus trying to coordinate at the AMS NCAR townhall would be important!
January 24, 2026 at 2:44 AM
Reposted by Dan Visioni
And yes, community needs to make clear anybody suggesting NCAR can be sold for parts will be forever shunned by the whole global scientific community. We’ll save NCAR, united. But mainly we’ll save NCAR because NCAR deserves it, NCAR workers deserve it, and the world deserves NCAR. Non prevalebunt.
January 24, 2026 at 2:18 AM
And yes, community needs to make clear anybody suggesting NCAR can be sold for parts will be forever shunned by the whole global scientific community. We’ll save NCAR, united. But mainly we’ll save NCAR because NCAR deserves it, NCAR workers deserve it, and the world deserves NCAR. Non prevalebunt.
January 24, 2026 at 2:18 AM
AGU+AMS+AAAS need to whip up industry partners, because they/we know that many wouldn’t do much without NCAR data and models (which they get FOR FREE). Dems need to stand firm & tell NSF they’re 👀. I actually don’t know the benefit of extra-US orgs contributions at this time: might make things worse
January 24, 2026 at 2:18 AM
I’m pretty sure the process will matter, but that this is a case where we need a coordinated, serious effort at a huge scale and where industry voices will matter greatly, together with UCAR+NWS+AMS+AGU.
January 24, 2026 at 2:04 AM
Is this so important in this current shitty world? Probably not, but it’s because the world sucks so much that I would expect people to be less shitty in their behavior as colleagues.
January 19, 2026 at 7:27 PM