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Climate models can’t explain 2023’s huge heat anomaly — we could be in uncharted territory

https://www.nature.com/articles/d41586-024-00816-z

Taking into account all known factors, the planet warmed 0.2 °C more last year than climate scientists expected. More and better data are urgently needed.

Climate models can’t explain 2023’s huge heat anomaly — we could be in uncharted territory

We need answers for why 2023 turned out to be the warmest year in possibly the past 100,000 years. And we need them quickly.

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Krazore

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We're entering a bit of uncharted territory when it comes to El Niño And La Niña (simplified explanation, El Niño hotter and La Niña colder). Normally they last about 9-12 months. We Just exited a triple dip La Niña (2020-2023), and the last one was 1998-2001, and before that 1973-1976. Now in the past this multi year La Niña followed a strong El Niño, and scientists had a few theories that mostly revolved around the planet cooling due to thermo differences across the surface. The issue with this recent La Niña is that it did not follow a strong El Niño, and the La Niña effect caused the jet stream to weaken significantly in 2023, it is very important for cooling different areas of the planet, weakening hurricanes, and many other things. Right now we're in a neutral state and likely to shift over to an El Niño later this year. Meaning what we've seen as of late could be a good bit worse when El Niño occurs.

We are also in a time period where the solar cycle is peaking (most likely to peak in 2025). While we're not exactly sure about the climate impacts of the solar activity, we do know it means more storms and magnetic waves hitting the Earth, and with global warming our atmosphere has expanded a bit and there could be more unexpected effects such as issues with GPS, aviation, and satellites..

All in all we're not entirely certain as to why 2023 was that much hotter and there are many theories, , but based on history we could experience a significantly hotter 2024. Also, if the trend continues it could mean that's 2023 was a freak year for us, but in the future it could become the norm.

I know this doesn't really answer the question, but at the moment there is no finite answer. However, due to these irregularities occurring it does not look good down the road and we won't know for certain until it happens.

EvacuateSoul

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NOAA actually says 62% chance La Niña later this year.

https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.shtml

Krazore

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I think I may have been looking at older data without realizing it, my bad, thanks for the correction.

stoneparchment

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I looked for a graph of the nino/a events over the past few decades and literally just grabbed the first result

It seems like some of what you said doesn't check out with this chart, like there was a four year Nina in '98-'02, and were currently in a very strong Nino.

Not trying to be contradictory and like maybe this isn't the best source, but can you give context on how what you said meshes with this?

Krazore

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So I grabbed my source from NOAA which is the US govt agency that covers atmospheric and ocean patterns. I'm on mobile so you'll have to forgive the non imbeded link.

https://research.noaa.gov/2023/11/07/recent-triple-dip-la-nina-upends-current-understanding-of-enso/

stoneparchment

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Thanks :)

Nachorella

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Thanks for the detailed response. Everytime I learn more about this stuff it just gets more and more worrisome. I already know very little about how the climate works and now even the experts are a little unsure what's going on. It doesn't paint a great picture for the future.