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Climate modelling

The Endangerment of the Endangerment Finding?

29 Jul 2025 by group 124 Comments

The EPA, along with the “Climate Working Group” (CWG) of usual suspects (plus Judith Curry and Ross McKitrick) at DOE, have just put out a document for public comment their attempt to rescind the 2009 Endangerment Finding for greenhouse gas emissions.

[Read more…] about The Endangerment of the Endangerment Finding?

Filed Under: Climate impacts, Climate modelling, Climate Science, Featured Story, Greenhouse gases, In the News, Instrumental Record, IPCC, Model-Obs Comparisons, Reporting on climate Tagged With: DOE, Endangerment Finding, EPA

Ocean circulation going South?

13 Jul 2025 by Gavin 42 Comments

Some intriguing new measurements of salinity in the oceans around Antarctica have set off reams of sensationalist speculations. Maybe some context is helpful…

[Read more…] about Ocean circulation going South?

Filed Under: Arctic and Antarctic, Climate modelling, Climate Science, Featured Story, hydrological cycle, Instrumental Record, Oceans Tagged With: salinity, sea ice, Southern Ocean

Predicted Arctic sea ice trends over time

31 May 2025 by Gavin

Over multiple generations of CMIP models Arctic sea ice trend predictions have gone from much too stable to about right. Why?

[Read more…] about Predicted Arctic sea ice trends over time

Filed Under: Arctic and Antarctic, Climate modelling, Climate Science, Featured Story, Model-Obs Comparisons Tagged With: Arctic amplification, CMIP3, CMIP5, CMIP6

WMO: Update on 2023/4 Anomalies

20 Mar 2025 by Gavin

The WMO released its (now) annual state of the climate report this week. As well as the (now) standard set of graphs related to increasing greenhouse gas concentrations, rising temperatures, reducing glacier mass, etc., Zeke Hausfather and I wrote up a short synthesis on the contributions to recent temperature anomalies.

[Read more…] about WMO: Update on 2023/4 Anomalies

Filed Under: Aerosols, Climate modelling, Climate Science, El Nino, Featured Story, Instrumental Record Tagged With: 2023, 2024

Climate change in Africa

18 Mar 2025 by rasmus

While there have been some recent set-backs within science and climate research and disturbing news about NOAA, there is also continuing efforts on responding to climate change. During my travels to Mozambique and Ghana, I could sense a real appreciation for knowledge, and an eagerness to learn how to calculate risks connected to climate change. 

[Read more…] about Climate change in Africa

Filed Under: Climate impacts, Climate modelling, Climate Science, climate services, Communicating Climate, downscaling, Featured Story

Comparison Update 2024

27 Jan 2025 by Gavin

One more dot on the graphs for our annual model-observations comparisons updates. Given how extraordinary the last two years have been, there are a few highlights to note.

[Read more…] about Comparison Update 2024

Filed Under: Climate modelling, Climate Science, Featured Story, Instrumental Record, Model-Obs Comparisons

¡AI Caramba!

28 Dec 2024 by Gavin

Bart Simpson seeing a ChatGPT logo and saying "AI Caramba!".

Rapid progress in the use of machine learning for weather and climate models is evident almost everywhere, but can we distinguish between real advances and vaporware?

[Read more…] about ¡AI Caramba!

Filed Under: Climate modelling, Climate Science, Featured Story Tagged With: AI/ML, CMIP7, Machine Learning

Operationalizing Climate Science

17 Nov 2024 by Gavin

There is a need to make climate science more agile and more responsive, and that means moving (some of it) from research to operations.

[Read more…] about Operationalizing Climate Science

Filed Under: Aerosols, Climate impacts, Climate modelling, Climate Science, Featured Story, Greenhouse gases, Instrumental Record, IPCC Tagged With: CMIP6, CMIP7

Cold extremes do in fact decrease under global warming

6 Oct 2024 by Gavin

The title of this post might seem like a truism, but for about a decade some people have claimed the opposite, and many people have spent much time and effort trying to understand why. Much of that effort was wasted.

[Read more…] about Cold extremes do in fact decrease under global warming

Filed Under: Arctic and Antarctic, Climate modelling, Climate Science, Instrumental Record Tagged With: Arctic amplification, extreme events, replication, reproduction

Phantastic Job!

19 Sep 2024 by Gavin

A truly impressive paper was published this week with a new reconstruction of global temperatures over the last ~500 million years.

[Read more…] about Phantastic Job!

Filed Under: Climate modelling, Climate Science, Paleoclimate Tagged With: Phanerozoic

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