Andrew Williams
@andrewilwilliams.bsky.social
740 followers 300 following 180 posts
Postdoc at UC San Diego | physics of clouds and climate 🌤️ 🌍 | PhD Oxford | views my own | he/him andrewilwilliams.github.io
Posts Media Videos Starter Packs
Reposted by Andrew Williams
volcanojenni.bsky.social
We’re advertising a PhD studentship for folks with good knowledge of Caribbean culture and society, with background in geography, human geography, humanities or interdisciplinary geosciences as part of our @leverhulme.ac.uk funded ‘volcanic histories’ project
Summary of what the PhD student will do. QR code in bottom LHS. Project part of our Leverhulme Trust funded project volcanic histories and the student will examine the cultural markers and response to to volcanic activity across the Eastern Caribbean. Understand local ways of knowing and remembering volcanic activity. Integrate scientific. And community knowledge for DRR - joining an interdisciplinary team from several universities.
Reposted by Andrew Williams
clarkevanswx.bsky.social
The Univ. of Nebraska’s Dept. of Earth and Atmospheric Sciences has established a webpage soliciting the community’s help in saving their program. Their hearing in front of campus admin is next Friday, Oct 10th. Please consider sharing why they’re essential!

eas.unl.edu/save-earth-a...
Save Earth and Atmospheric Sciences! | Department of Earth and Atmospheric Sciences | Nebraska
The University of Nebraska-Lincoln is proposing to close the Department of Earth & Atmospheric Sciences (EAS) as part of its budget reduction plan. We strongly oppose this plan. EAS conducts research ...
eas.unl.edu
Reposted by Andrew Williams
helenczerski.bsky.social
There's a really nice explanation (with clear graphics) in this @quantamagazine.bsky.social article of why most molecules in the atmosphere (oxygen & nitrogen) don't act as greenhouse gases, but a lot of the far less numerous ones (like carbon dioxide and methane) do. A great teaching aid :)
The Quantum Mechanics of Greenhouse Gases | Quanta Magazine
Earth’s radiation can send some molecules spinning or vibrating, which is what makes them greenhouse gases. This infographic explains how relatively few heat-trapping molecules can have a planetary ef...
www.quantamagazine.org
Reposted by Andrew Williams
danielbolnick.bsky.social
The GRFP announcement from NSF cuts out an entire cohort of 2nd year students from consideration, without warning. This is so deeply unfair that it warrants a formal protest from the scientific community. If someone wants to work with me to craft an open letter and solicit signatures, LMK.
dangaristo.bsky.social
New: After a long wait, the GRFP solicitation is live! Deadlines have been extended to early November, so applicants have a bit over a month to submit. www.nsf.gov/funding/oppo...
NSF Graduate Research Fellowship Program (GRFP)
www.nsf.gov
Reposted by Andrew Williams
nick-lutsko.bsky.social
I wrote a short piece on the debate about the future of climate modeling: Should we pool resources to do km-scale "masterpiece" runs or focus on using ML to build data-driven models that can still do large ensembles? 1/3
Reposted by Andrew Williams
andrewdessler.com
this is sooooooo f'ing sweet. every time Sec. Chris Wright lies about the DOE Climate Working Group report, reporters cite our response.
Mr. Wright falsely claimed that critics of an Energy Department report — written by five researchers who reject the established scientific consensus that the burning of oil, gas and coal is dangerously heating the planet — did not dispute any of the report’s data or facts.

“They just didn’t like that the conclusion of our report was, climate change is a real physical phenomenon that’s unfolding, it’s just not the crisis it’s often sold to be.”

In fact, 85 scientists submitted a sweeping critique of the report detailing a litany of inaccuracies, including claims that sea level rise is not accelerating; that more carbon dioxide in the atmosphere will help plants grow; and that computer models exaggerate future temperature increases. The American Meteorological Society, a leading science organization, also outlined what it called “foundational flaws” in the report. And the National Academies of Sciences, Engineering, and Medicine, the nation’s leading scientific advisory body, also contradicted the Energy Department report, saying the evidence that greenhouse gases threaten human health has only grown over time.
Reposted by Andrew Williams
benmsanderson.bsky.social
Sorry, but disagree with @hausfath.bsky.social here. You open Pandora's box, you ain't closing it again. We've already seen with Paris that well intentioned international agreements do not translate into physical reality and SRM governance is a much harder problem. Zero is the only safe level. /1
hausfath.bsky.social
I have a new @nytimes.com guest essay w/ @davidkeith.bsky.social about sunlight reflection. We note its not a solution for climate change and at best a band aid to treat systems, and suggest if its ever done it should only be to replace the cooling from air pollution today:
Opinion | A Responsible Way to Cool the Planet
A small, carefully scaled geoengineering program could compensate for the loss of cooling as we eliminate sulfur pollution.
www.nytimes.com
Reposted by Andrew Williams
weatherwest.bsky.social
Verbatim: "White House spokeswoman Abigail Jackson described Mr Swain as a "longtime Democrat donor who has spent hundreds of dollars supporting liberal politicians, including loser Kamala Harris, with radical climate policies that the American people have repeatedly rejected."
weatherwest.bsky.social
Indeed. Earlier this summer, the White House did this to me, as a scientific expert source in media, and issued a formal statement regarding my personal campaign contribution history in an attempt to discredit my commentary on wildfire, climate, and federal policy. Yet more alarm bells ringing...
amykristinsanders.bsky.social
I had this exact same experience this morning. Same reporter as Heidi.

This is *not* normal.

I have spoken to the press on these issues for two decades. No government official has ever demanded to know my identity in order to give a comment on a story.
Reposted by Andrew Williams
blazgaspa.bsky.social
Last week at the Italy–France border: moist valley air rising and forming near-surface clouds, while a higher cloud layer (with a cloud base of around 3,500 metres) tries to grow by convection, but fails to reach the rain stage. Beautiful!
Reposted by Andrew Williams
climate.us
EXCITING NEWS!
The Climate.us page has officially launched.

Here you will be able to read more about us, our plan, updates, see what real people are saying, view our news coverage, and of course find ways to take action.

We look forward to your continued support.
Reposted by Andrew Williams
hausfath.bsky.social
I'm not sure many folks realize just how persistent the warming from CO2 is.

Here is a set of 1000-year climate model runs (using FaIR) simulating one year of CO2 emissions (40 gigatons in 2020); a millennia later the world has not cooled back down!
Reposted by Andrew Williams
andrewdessler.com
nice article from Nadir Jeevanjee (is he on bluesky?) about predictions climate models got right. successful predictions are the gold standard of science.

5 forecasts early climate models got right – the evidence is all around you
theconversation.com/5-forecasts-...
5 forecasts early climate models got right – the evidence is all around you
From rising global temperatures to the fast-warming Arctic, early climate models predicted the changes half a century ago.
theconversation.com
Reposted by Andrew Williams
gmacgilchrist.bsky.social
I’m increasingly confident that these quotes are fully and intentionally fabricated, having searched extensively in both reports.

The quotes are framed to suggest that the IPCC *concluded* that natural variability undermines attribution of anthropogenic climate change.

FYI: It does not.
gmacgilchrist.bsky.social
Made up quotes in the DOE CWG report?

In Ch8, authors claim to quote IPCC AR5 and AR6 summary statements suggesting difficulty attributing climate change due to decadal variability.

I suspected out-of-context, but I can't find the quotes (or anything like them) *at all*.

Anyone know any better?
Reposted by Andrew Williams
wcrp-cmip.org
🌍 New today in Nature: Climate models need faster, more frequent data updates - here's how to do it 🌍

Today, a group of scientists, led by Vaishali Naik published a Comment in Nature calling for a major shift in how we support climate modelling.

🔗 www.nature.com/articles/d41...
Reposted by Andrew Williams
zacklabe.com
“The Office of Management and Budget approved a fiscal 2025 spending plan for the National Oceanic and Atmospheric Administration that would claw back remaining funds at most of the agency’s line offices.”
Trump Moves Around Congress to Cut Climate, Ocean Science Funds
The government’s climate and weather agency would take a budget hit under a spending plan the White House approved this month.
news.bgov.com
Reposted by Andrew Williams
andrewilwilliams.bsky.social
📢📢 New preprint alert! 📢📢

Radiation is a key piece of climate models, but comes with a trade-off: use an accurate scheme (which is difficult to understand), or a simple scheme (which is not very accurate)...

Here I introduce a scheme which bridges this gap!

arxiv.org/abs/2508.09353
Reposted by Andrew Williams
andrewilwilliams.bsky.social
TL;DR, it only takes six simple equations to do (reasonably) accurate longwave radiative transfer in a GCM!

Demonstrated for an Earth-like planet, but the approach could easily be extended to exoplanets!
andrewilwilliams.bsky.social
📢📢 New preprint alert! 📢📢

Radiation is a key piece of climate models, but comes with a trade-off: use an accurate scheme (which is difficult to understand), or a simple scheme (which is not very accurate)...

Here I introduce a scheme which bridges this gap!

arxiv.org/abs/2508.09353
Reposted by Andrew Williams
hausfath.bsky.social
The recent DOE climate science report misrepresents the work of many researchers. Carbon Brief asked those cited to review the parts of the report where their work was used, and we collectively found 100+ misleading or false statements: interactive.carbonbr...