iiinova — where your digital self keeps evolving

Tim Andrews @tim-andrews.bsky.social · 02/07/2026

Thank you Richard. I have you listed as part of the group for a very short time circa 2002-03 ish under Cath? Does that sound right? People's memories are a bit hazy going back that far, so compiling a history of the group was somewhat challenging! :-)

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

Having spent much of my own career in the team, it is a privilege to now lead it. My aim is simple: to help ensure the group remains at the forefront of understanding climate processes & feedbacks, and translating that understanding into improved climate projections and advice. The show goes on.

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

Current colleagues include Mark Webb, Harry Mutton, Philip Brohan, Ben Booth and Mark Ringer, who bring expertise spanning climate processes, historical climate data, machine learning and climate projections. Future breakthroughs will draw on these strengths.

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

The group has benefited from outstanding leadership over the years, particularly Catherine Senior and Mark Ringer, and from contributions by many exceptional scientists including William Ingram, Yoko Tsushima, Alejandro Bodas-Salcedo, Keith Williams and many others.

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

The tradition continued through developments such as COSP, leadership of CFMIP, major international assessments of climate sensitivity, and a broad body of work spanning climate processes, model evaluation and climate change.

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

Even today's discussion of the "pattern effect" can trace intellectual roots back more than 25 years (Senior and Mitchell 2000).

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

Following these came a flurry of pioneering work on the importance of cloud feedback processes (Mitchell et al 1989), mechanisms of cloud changes (Mitchell & Ingram 1992), and the impact of cloud parameterisation on climate sensitivity (Senior & Mitchell 1993).

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

The team's roots trace back to the Climate Change Group led by John Mitchell, one of the architects of modern climate modelling. Its scientific lineage includes seminal studies of climate change and climate sensitivity that helped shape the field, including John's 1983 and 1987 classics.

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Tim Andrews @tim-andrews.bsky.social · 02/07/2026

Delighted to have taken on leadership of the Climate Sensitivity & Feedbacks team at the Met Office Hadley Centre. It's a privilege to follow Mark Ringer, under whose leadership the team became internationally recognised. The group also has a remarkable scientific lineage, worth a thread... 🧵

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Tim Andrews @tim-andrews.bsky.social · 15/06/2026

I’m hiring a Research Fellow at the University of Leeds to work on understanding Earth’s increasing energy imbalance. Details and how to apply below. It's short term (6 months full-time, or longer part time) but a really important topic. Closes 26 June 2026. jobs.leeds.ac.uk/vacancy.aspx...

jobs.leeds.ac.uk

Job Opportunity at University of Leeds: Research Fellow in Understanding Earth’s Energy Imbalance

Are you an ambitious researcher looking for your next challenge? Do you have an established background in atmospheric or climate science with an interest in physical climate change and the Earth’s ene...

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Tim Andrews @tim-andrews.bsky.social · 10/06/2026

Not yet. CMIP7 simulations are still ongoing.

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Tim Andrews @tim-andrews.bsky.social · 10/06/2026

The Radiative Forcing Model Intercomparison Project (RFMIP2.0) for CMIP7 protocol paper is now published: gmd.copernicus.org/articles/19/...

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Vince Cooper @vtcoop.bsky.social · 30/01/2026

Check out the @pnas.org highlight for our new paper on how Paleoclimate Pattern Effects in the Pliocene lead to tighter constraints on the modern response to CO2 (a.k.a. climate sensitivity)

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Tim Andrews @tim-andrews.bsky.social · 29/01/2026

CFMIP protocol pre-print now out for discussion egusphere.copernicus.org/preprints/20...

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Jessica Tierney @leafwax.bsky.social · 23/01/2026

Really excited to see this paper out!! Led by @vtcoop.bsky.social we show that if you use cold and warm paleoclimates together, you can reduce uncertainty in Earth's climate sensitivity by quantifying the pattern effect and more precisely constrain future climate change www.pnas.org/doi/10.1073/...

pnas.org

Paleoclimate pattern effects help constrain climate sensitivity and 21st-century warming | PNAS

Paleoclimates provide examples of past climate change that inform estimates of modern warming from greenhouse-gas emissions, known as Earth’s clima...

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Met Office - weather and climate @metoffice.gov.uk · 27/10/2025

How are we equipping people for the current and future climate? Our Chief Executive @pennyend.bsky.social has spoken to @carbonbrief.org about climate science, tackling misinformation and AI. Read and watch ⤵️ www.carbonbrief.org/the-carbon-b...

carbonbrief.org

The Carbon Brief Interview: UK Met Office chief executive Penny Endersby - Carbon Brief

Prof Penny Endersby has been chief executive of the UK Met Office since December 2018.

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Gavin Schmidt @climateofgavin.bsky.social · 23/09/2025

What's that? Climate predictions, you say? Okay! www.realclimate.org/index.php/cl...

Climate predictions made 20 years ago compared to the world that actually happened.

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John Marsham @johnmarsham.bsky.social · 21/08/2025

Fantastic to welcome Dr Ben Booth to @universityofleeds.bsky.social School of Computer Science: the 5th of 5 new Met Office Academic Partnership joint positions. ML is transforming science. Ben's appointment will better link atmos & computer science & deliver impact eps.leeds.ac.uk/news/article...

eps.leeds.ac.uk

Dr Ben Booth appointed to Met Office Academic Partnership post

The School of Computer Science is delighted to welcome Dr Ben Booth as part of the prestigious Met Office Academic Partnership (MOAP) at Leeds.

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Tim Andrews @tim-andrews.bsky.social · 12/08/2025

Abstract deadline is tomorrow (13th Aug) for the CMIP Community Workshop in Japan March 2026. cmip2026.org/programme/ab... Submissions for in person or virtual presentation welcome. Picked up out some fun sessions below 👇

cmip2026.org

About - CMIP Community Workshop 2026

The CMIP Community Workshop 2026 will bring together a growing, and increasingly diverse, community of Earth system scientists, partners, and stakeholders. It will be an opportunity to discuss the lat...

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Tim Andrews @tim-andrews.bsky.social · 29/05/2025

Some sessions that ought to be fun & interesting: 🔷 ID4 RFMIP: Exploring radiative Forcing in models and observations to understand climate change 🔷 ID5 CERESMIP: Confronting models with observed changes in the Earth’s energy imbalance 🔷 ID15 CFMIP: Clouds, circulation and climate sensitivity

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Tim Andrews @tim-andrews.bsky.social · 31/07/2025

Got a call to visit the work post room as there was a parcel for me… (first time in 10+years!) It was a book, sent to contributing authors I presume, of papers that came out of an ISSI workshop in 2022. It’s easy to forget that journals often still have physical copies… a joy to flick through.

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Chris Smith @cjsmith.eu · 04/07/2025

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

wcrp-cmip.org

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

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Tim Andrews @tim-andrews.bsky.social · 26/06/2025

Fantastic to have spent two days at Leeds discussing physical climate science with new and old colleagues. Looking forward to the opportunities ahead @earthandenvleeds.bsky.social. And it’s great to be back where it all began 20 odd years ago as a student, but now on the other side of the fence…

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Tim Andrews @tim-andrews.bsky.social · 19/06/2025

I think there is some automated diagnostic effort now. Fairly sure Gregory plots are included in ESMValTool for cmip6 and for cmip7 it’s in the Rapid Evaluation Framework… @mzelinka.bsky.social and I are being replaced by bots

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Tim Andrews @tim-andrews.bsky.social · 16/06/2025

I should clarify our physical model HadGEM will be. It might not be true for our earth system submission to CMIP7 e.g UKESM. One CMIP iteration at a time. CMIP6 we solved the Dec 1st start date annoyance. CMIP7 (partly) the 360 day calendar. Slowly but surely…. What do you want for CMIP8?

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Tim Andrews @tim-andrews.bsky.social · 16/06/2025

I should add a clarification that this might not be true for earth system submission to CMIP7 e.g UKESM. But the physical model HadGEM has moved to Gregorian. Slowly but surely….

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Tim Andrews @tim-andrews.bsky.social · 16/06/2025

You’ll be pleased to hear that our next model for CMIP7 submission will use a Gregorian calendar…

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Andy Shepherd @andyshepherd.bsky.social · 13/06/2025

The @metoffice.gov.uk Hadley Centre is a powerhouse of climate science. If you'd like to help guide their program of work, please consider joining their Science Review and Advisory Group. There has never been a more important time to stand up for science ! 🧪🌍🌡️ www.metoffice.gov.uk/research/app...

metoffice.gov.uk

Met Office Hadley Centre Climate Programme: Science Review and Advisory Group Members

This advertisement is for the recruitment of up to four new members of the Met Office Hadley Centre Climate Programme Science Advisory and Review Group. It is posted on behalf of The UK Department for...

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Tim Andrews @tim-andrews.bsky.social · 12/06/2025

Almost as bad as his Covid estimates

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Tim Andrews @tim-andrews.bsky.social · 11/06/2025

Looks a good read: The Sea Surface Temperature Pattern Effect on Outgoing Longwave Radiation: The Role of Large-Scale Convective Aggregation agupubs.onlinelibrary.wiley.com/doi/full/10....

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Tim Andrews @tim-andrews.bsky.social · 29/05/2025

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CMIP ─ Coupled Model Intercomparison Project @wcrp-cmip.org · 27/05/2025

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-...

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CMIP ─ Coupled Model Intercomparison Project @wcrp-cmip.org · 29/05/2025

The CMIP Community Workshop 2026 will be held in Kyoto, Japan from 9-13th March 2026. The call for side sessions for CMIP26 is now open! Find out more at wcrp-cmip.org/cmip26-side-...

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Tim Andrews @tim-andrews.bsky.social · 27/05/2025

I've got a Wren in my garden today too

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Richard Allan @rpallanuk.bsky.social · 12/05/2025

The doubling of the rate of global heating in recent decades has surprised the scientific community so needs to be better understood yet our capability to measure Earth's energy imbalance is at risk: doi.org/10.1029/2024...

Time series showing growing Earth energy imbalance (greater heating) this century

Earth's energy imbalance needs to decline to stabilise global temperatures but it is growing

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Tim Andrews @tim-andrews.bsky.social · 02/05/2025

Or "two-model model with/without ε" if we're at that level. I agree "εBM" would be nice! Speaking of which, that is probably the most confusing name we have, i.e. "ocean heat uptake efficiency" versus "efficacy of ocean heat uptake". Many have sailed into those rocks...

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Tim Andrews @tim-andrews.bsky.social · 02/05/2025

I think we just say "the two-layer model". That is usually sufficiently from context. But sometimes we insert "two-layer ^energy balance^ model" if required.

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Tim Andrews @tim-andrews.bsky.social · 02/05/2025

- Agreed - Agreed - I don't think anyone this side of the pond calls it the Held two-layer model... ;-)

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Andrew Williams @andrewilwilliams.bsky.social · 28/04/2025

Anyone interested in learning about a first principles, quantitative theory for convective mass flux in a warming world? Read the paper and/or come to my EGU talk on Thursday! :) agupubs.onlinelibrary.wiley.com/doi/full/10....

agupubs.onlinelibrary.wiley.com

A Robust Constraint on the Response of Convective Mass Fluxes to Warming

Convective mass fluxes robustly decrease with warming, at around 3−5 $3-5$%K−1 ${\mathrm{K}}^{-1}$, when viewed in temperature coordinates The weakening in temperature coordinates is explained by...

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