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Climate modelling

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

Oh My, Oh Miocene!

28 Aug 2024 by Gavin

A recent paper suggested that ‘climate sensitivity’ derived from a new paleo-CO2 record is around 7.2ºC (for equilibrium climate sensitivity ECS) and ~13.9ºC (Earth System Sensitivity – ESS) for a doubling of CO2. Some press has suggested that this means that “Earth’s Temperature Could Increase by 25 Degrees” (F). Huge if true! Fortunately these numbers should not be taken at face value, but we need to dig into the subtleties to see why.

[Read more…] about Oh My, Oh Miocene!

Filed Under: Carbon cycle, Climate modelling, Climate Science, Greenhouse gases, Paleoclimate Tagged With: ECS, ESS, Miocene, paleo-CO2, replication

The need for pluralism in climate modelling

24 Aug 2024 by group

How should we allocate resources for climate modelling if the goal is to improve climate-related decisions? Higher resolution, machine learning and/or storylines? A call for a deeper discussion on how we should develop the climate modelling toolbox.

Guest post by Marina Baldissera Pacchetti, Julie Jebeile and Erica Thompson

[Read more…] about The need for pluralism in climate modelling

Filed Under: Climate modelling, Climate Science, climate services, Solutions Tagged With: CMIP6, GCMs, km-scale, Machine Learning

New journal: Nature 2023?

11 May 2024 by Gavin

[Last update Dec 6, 2024] There were a number of media reports today [May 11, 2024] related to Yuan et al. (2024), for instance, New Scientist, The Guardian etc. However, this is really just the beginning of what is likely to be a bit of a cottage industry in the next few months relating to possible causes/influences on the extreme temperatures seen in 2023. So to help people keep track, we’ll maintain a list here to focus discussions. Additionally, we’ll extract out the key results (such as the reported radiative forcing) as a guide to how this will all eventually get reconciled.

[Read more…] about New journal: Nature 2023?

References

  1. T. Yuan, H. Song, L. Oreopoulos, R. Wood, H. Bian, K. Breen, M. Chin, H. Yu, D. Barahona, K. Meyer, and S. Platnick, "Abrupt reduction in shipping emission as an inadvertent geoengineering termination shock produces substantial radiative warming", Communications Earth & Environment, vol. 5, 2024. http://dx.doi.org/10.1038/s43247-024-01442-3

Filed Under: Aerosols, Climate modelling, Climate Science, El Nino, Featured Story, Instrumental Record, Oceans, Sun-earth connections Tagged With: 2023, marine shipping

Much ado about acceleration

4 Apr 2024 by Gavin

There has been a lot of commentary about perceived disagreements among climate scientists about whether climate change is (or will soon be) accelerating. As with most punditry, there is less here than it might seem.

[Read more…] about Much ado about acceleration

Filed Under: Climate modelling, Climate Science, El Nino, Featured Story, Greenhouse gases, Hurricanes, Instrumental Record, IPCC Tagged With: acceleration, climate change, CMIP6

More solar shenanigans*

7 Mar 2024 by Gavin

Going back a few months, I spent a bit of time pointing out the strategy and nonsense in the various Willie Soon and company’s efforts to blame current warming on solar activity. I specifically pointed out their cultish devotion to a single solar activity reconstruction (Hoyt and Schatten, 1993) (HS93); with an update from Scaffeta (2023), and their increasingly elaborate efforts to create temperature series that correlate to it.

Well, Theodosios Chatzistergos has just published a deep dive into the HS93 reconstruction (Chatzistergos, 2024) (C24) and… let’s say the results will not be surprising to regular readers.

[Read more…] about More solar shenanigans*

References

  1. D.V. Hoyt, and K.H. Schatten, "A discussion of plausible solar irradiance variations, 1700‐1992", Journal of Geophysical Research: Space Physics, vol. 98, pp. 18895-18906, 1993. http://dx.doi.org/10.1029/93JA01944
  2. N. Scafetta, "Empirical assessment of the role of the Sun in climate change using balanced multi-proxy solar records", Geoscience Frontiers, vol. 14, pp. 101650, 2023. http://dx.doi.org/10.1016/j.gsf.2023.101650
  3. T. Chatzistergos, "A Discussion of Implausible Total Solar-Irradiance Variations Since 1700", Solar Physics, vol. 299, 2024. http://dx.doi.org/10.1007/s11207-024-02262-6

Filed Under: Climate modelling, Climate Science, Featured Story, Instrumental Record, Paleoclimate, Sun-earth connections Tagged With: Willie Soon

Spencer’s Shenanigans

28 Jan 2024 by Gavin

A recent sensible-sounding piece by Roy Spencer for the Heritage foundation is full of misrepresentations. Let’s play spot the fallacy.

[Read more…] about Spencer’s Shenanigans

Filed Under: Climate modelling, Climate Science, Featured Story, Instrumental Record, IPCC Tagged With: CMIP6, MSU, Roy Spencer

Not just another dot on the graph? Part II

16 Jan 2024 by Gavin

Annual updates to the model-observation comparisons for 2023 are now complete. The comparisons encompass surface air temperatures, mid-troposphere temperatures (global and tropical, and ‘corrected’), sea surface temperatures, and stratospheric temperatures. In almost every case, the addition of the 2023 numbers was in line with the long term expectation from the models.

[Read more…] about Not just another dot on the graph? Part II

Filed Under: Arctic and Antarctic, Climate modelling, Climate Science, Featured Story, Instrumental Record, Model-Obs Comparisons, Oceans Tagged With: CMIP3, CMIP5, CMIP6, MSU, SAT, SSU, TMT

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