Chris Smith
@cjsmith.be
1.7K followers 320 following 120 posts

Climate scientist at Vrije Universiteit Brussel & IIASA. IPCC AR7 CLA. Responsive climate projections. The guy behind the fair model and radiative forcing barchart. Occasional runner and guitarist. github.com/chrisroadmap | cjsmith.be .. more

Environmental science 46%
Geography 15%
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cjsmith.be
I know!!! I was outvoted

cjsmith.be
If you want to get your simple climate model picked up by IPCC AR7, see below 👇

We have 11 on our radar from the previous round of RCMIP (egusphere.copernicus.org/preprints/20...), plus a few others we found since.

Anybody we don't know about please ping me or Alex

cjsmith.be
send me a PM :)

cjsmith.be
Now that it's public, I'm very honoured to be selected as Coordinating Lead Author of Chapter 5, Working Group I for the IPCC Seventh Assessment Report 📚🌍

Our chapter is one hell of a team!

Full author list for all three working groups: apps.ipcc.ch/report/autho...
IPCC Authors
apps.ipcc.ch

cjsmith.be
also very willing to help if you get stuck. Sorry the new interface is clunky - I went speed over intuition.

cjsmith.be
A deep dive into the world of simple climate models: preprint out from @arp-climate.bsky.social.

we know this isn't exhaustive - we focus on the models that participated in RCMIP phases 1 and 2. There will be a phase 3, coming soon.

Reposted by Chris Smith

trackow.bsky.social
How much warming? That is where simple modelling can help. Turns out that the temperature response to the observed reduction in planetary albedo since December 2020 (estimated from a simple energy-balance #model, doi.org/10.1175/JCLI...) may explain the warming ‘gap’ of about 0.2K. (7/8)
Supplement to Goessling, Rackow, & Jung; Science, https://doi.org/10.1126/science.adq7280

Reposted by Chris Smith

cjsmith.be
This water vapour input (green) more than offset the small cooling effect from a increase in stratospheric aerosol optical depth (blue), resulting in a net volcanic radiative forcing (purple) that is above the long-term quiescent baseline value for 2022-2024.

cjsmith.be
We (@tim-andrews.bsky.social, Ryan Kramer and I) are leading a session around understanding radiative forcing in models at the CMIP Community Workshop in Kyoto, Japan, next March. Abstract submissions open until 13 August:

wcrp-cmip.org/event/cmip20...
Session ID #4
CMIP Community Workshop 2026 - Coupled Model Intercomparison Project
The CMIP Community Workshop 2026 will bring together a growing, and increasingly diverse, community of Earth system scientists, partners, and stakeholders. It
wcrp-cmip.org

cjsmith.be
Hello world, who else is in Vienna this week?

cjsmith.be
In this Carbon Brief post we talk about the implications of not including future volcanic eruptions in climate scenarios, as described in our recent paper: www.nature.com/articles/s43...

Reposted by Chris Smith

joshgabbatiss.bsky.social
It's that time of year again!

I'll be in Bonn covering the #SB62 UN climate talks until the end of the week with @mollylempriere.carbonbrief.org

Keen to hear the hot takes on climate finance, loss and damage and anything else you think is interesting

Reposted by Joeri Rogelj

cjsmith.be
I'll be giving a short talk on 1.5°C at a mini-symposium at VUB on Friday 6 June as part of an event celebrating the award of an honorary doctorate to @joerirogelj.bsky.social, see below for details and registration!
wcrp-cmip.org
The CMIP Community Workshop 2026 will be held in Kyoto, Japan from 9-13th March 2026. The call for abstracts for CMIP26 is now open! Find out more at wcrp-cmip.org/cmip26-call-...

Reposted by Chris Smith

Reposted by Chris Smith

gergmunday.bsky.social
New paper on the risks of forest ecosystem impacts under emissions pathways designed to meet the Paris Agreement temperature goals is out today in Nature Climate Change! 🌳

Read it here: www.nature.com/articles/s41558-025-02327-9
www.nature.com

cjsmith.be
To all of my friends in Oslo, I am presenting at the Joint Oslo Seminar tomorrow at UiO! It will be the full-fat version of my EGU talk:

Updated IPCC emissions scenarios no longer limit warming to 1.5°C

Details 👇

www.mn.uio.no/geo/english/...
carlschleussner.bsky.social
Very excited to announce that the call for abstracts for our @iiasa.ac.at overshoot conference is out.

Join us to explore the eightfold path to manage climate risks of an overshoot world:
overshootconference.org
Abstract deadline: June 27.
Overshoot |
overshootconference.org

cjsmith.be
It should be, but I don't know if this will happen again this year. So get in early :)

cjsmith.be
Here's @arp-climate.bsky.social presenting on the upcoming process-based carbon cycle in FaIR at #EGU25!

cjsmith.be
It's subtle. I'll show you in Oslo

cjsmith.be
Is 1.5°C still within reach? Find out tomorrow (Tuesday) at #EGU25

09:15, room 0.31/32, session CL3.2.1

meetingorganizer.copernicus.org/EGU25/EGU25-...
Abstract EGU25-11441
meetingorganizer.copernicus.org

Reposted by Chris Smith

cjsmith.be
Some of the WorldTrans crew at EGU25 with Axel's poster 👏