Tim Andrews
@tim-andrews.bsky.social
Research Scientist | Met Office Hadley Centre
Associate Professor | University of Leeds
Climate and Atmospheric Science
https://timothyandrews.github.io/
Associate Professor | University of Leeds
Climate and Atmospheric Science
https://timothyandrews.github.io/
Quick trip home to the #LakeDistrict 👌🏼
August 3, 2025 at 2:46 PM
Quick trip home to the #LakeDistrict 👌🏼
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.
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.
July 31, 2025 at 3:32 PM
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.
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.
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…
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…
June 26, 2025 at 3:58 PM
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…
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…
Next, we asked a counterfactual: what would a climate models global warming trend have been if it had the 'correct' surface albedo feedback?
Easy enough to estimate, we simply substituted in the albedo feedback and used a simple energy balance model (F = rho * dT) to find the impact on dT. [6/n]
Easy enough to estimate, we simply substituted in the albedo feedback and used a simple energy balance model (F = rho * dT) to find the impact on dT. [6/n]
April 8, 2025 at 1:54 PM
Next, we asked a counterfactual: what would a climate models global warming trend have been if it had the 'correct' surface albedo feedback?
Easy enough to estimate, we simply substituted in the albedo feedback and used a simple energy balance model (F = rho * dT) to find the impact on dT. [6/n]
Easy enough to estimate, we simply substituted in the albedo feedback and used a simple energy balance model (F = rho * dT) to find the impact on dT. [6/n]
Zooming in on the Southern Ocean, we independently verified that the real world experienced a strongly negative feedback over these decades as seen in satellite reconstructions of the Earth's energy imbalance (DEEP-C, @rpallanuk.bsky.social). [5/n]
April 8, 2025 at 1:54 PM
Zooming in on the Southern Ocean, we independently verified that the real world experienced a strongly negative feedback over these decades as seen in satellite reconstructions of the Earth's energy imbalance (DEEP-C, @rpallanuk.bsky.social). [5/n]
First we compared the radiative feedback in a 50 member ensemble of HadGEM3-GC3.1-LL historical simulations of 1985-2014 to that given observed SST and sea-ice trends.
See Figure - the Southern Ocean stands out like a sore thumb.
It's the same story across CMIP models. [4/n]
See Figure - the Southern Ocean stands out like a sore thumb.
It's the same story across CMIP models. [4/n]
April 8, 2025 at 1:54 PM
First we compared the radiative feedback in a 50 member ensemble of HadGEM3-GC3.1-LL historical simulations of 1985-2014 to that given observed SST and sea-ice trends.
See Figure - the Southern Ocean stands out like a sore thumb.
It's the same story across CMIP models. [4/n]
See Figure - the Southern Ocean stands out like a sore thumb.
It's the same story across CMIP models. [4/n]
Between 1985 and 2014 the Southern Ocean cool and the amount of sea ice increased, despite the world warming by just under 0.2°C per decade globally.
This phenomena is generally not simulated by atmosphere-ocean coupled climate model simulations of historical climate change over this period [2/n]
This phenomena is generally not simulated by atmosphere-ocean coupled climate model simulations of historical climate change over this period [2/n]
April 8, 2025 at 1:54 PM
Between 1985 and 2014 the Southern Ocean cool and the amount of sea ice increased, despite the world warming by just under 0.2°C per decade globally.
This phenomena is generally not simulated by atmosphere-ocean coupled climate model simulations of historical climate change over this period [2/n]
This phenomena is generally not simulated by atmosphere-ocean coupled climate model simulations of historical climate change over this period [2/n]
Biases in Climate Model Global Warming Trends Related to Deficiencies in Southern Ocean Sea Ice Evolution Over Recent Decades
New paper in GRL by Harry Mutton and myself: agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Quick thread [1/n] 🧵:
New paper in GRL by Harry Mutton and myself: agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Quick thread [1/n] 🧵:
April 8, 2025 at 1:54 PM
Biases in Climate Model Global Warming Trends Related to Deficiencies in Southern Ocean Sea Ice Evolution Over Recent Decades
New paper in GRL by Harry Mutton and myself: agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Quick thread [1/n] 🧵:
New paper in GRL by Harry Mutton and myself: agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Quick thread [1/n] 🧵:
🚨 #CMIP Community Workshop 2026 🚨
🌏 Kyoto Japan, 9-13th March 2026
Call for Session Proposals are now open :
📅 Session Proposal Deadline: 12:00 UTC, 25 April 2025
🔗 wcrp-cmip.org/cmip26-sessi...
@wcrp-cmip.org
🌏 Kyoto Japan, 9-13th March 2026
Call for Session Proposals are now open :
📅 Session Proposal Deadline: 12:00 UTC, 25 April 2025
🔗 wcrp-cmip.org/cmip26-sessi...
@wcrp-cmip.org
March 26, 2025 at 3:48 PM
🚨 #CMIP Community Workshop 2026 🚨
🌏 Kyoto Japan, 9-13th March 2026
Call for Session Proposals are now open :
📅 Session Proposal Deadline: 12:00 UTC, 25 April 2025
🔗 wcrp-cmip.org/cmip26-sessi...
@wcrp-cmip.org
🌏 Kyoto Japan, 9-13th March 2026
Call for Session Proposals are now open :
📅 Session Proposal Deadline: 12:00 UTC, 25 April 2025
🔗 wcrp-cmip.org/cmip26-sessi...
@wcrp-cmip.org
Hello again Spring. Been a while. ☀️
March 1, 2025 at 5:13 PM
Hello again Spring. Been a while. ☀️
Doesn’t look very clear in the picture but it was to the naked eye.
Something like this:
Something like this:
December 24, 2024 at 6:07 PM
Doesn’t look very clear in the picture but it was to the naked eye.
Something like this:
Something like this:
A rare treat this Christmas Eve: Anticrepuscular (shadow) rays, I believe. A first for me.
Like the shafts of sun light you may have seen near sunset, but converging at the antisolar point (the point in the sky opposite the sun) - an illusion like railroads converging at infinity…
Like the shafts of sun light you may have seen near sunset, but converging at the antisolar point (the point in the sky opposite the sun) - an illusion like railroads converging at infinity…
December 24, 2024 at 6:07 PM
A rare treat this Christmas Eve: Anticrepuscular (shadow) rays, I believe. A first for me.
Like the shafts of sun light you may have seen near sunset, but converging at the antisolar point (the point in the sky opposite the sun) - an illusion like railroads converging at infinity…
Like the shafts of sun light you may have seen near sunset, but converging at the antisolar point (the point in the sky opposite the sun) - an illusion like railroads converging at infinity…