Leon Simons (looking up) Profile picture
Jun 21, 2023 5 tweets 3 min read Read on X
I like to imagine a world where people care as much about the North Atlantic Ocean, as about a small vessel lost inside of it. Image
Here's a 8567 pixel #ShowYourStripes from the North Atlantic Ocean since 2000.

June 20 pales the warming from recent years: Image
Also see the Ocean Heat Content stripes.

Because about 90% of the heat from global warming goes into heating the oceans, this is one of the clearest signs of our warming world.

From @Lijing_Cheng et al.: Image
@Lijing_Cheng And here's 12,000 years of stripes!

From 6000 years ago until the industrial revolution the planet cooled down, even though greenhouse gases increased! (likely due to aerosol emissions, which helped stabilize Holocene climate!) Image
@Lijing_Cheng @ed_hawkins From study by @MichaelPErb et al.
Full resolution and study available here:

cp.copernicus.org/articles/18/25… Image

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More from @LeonSimons8

Apr 18
If only people understood how significant this >10% decrease in cloud cover and the same amount of increase in sunshine duration are.

It would be front page news over all Europe media.

It's not even included in many (most?) regional climate models... Image
Figuring out what underlying assumptions in models are is much harder than you'd think.

As if it's designed that way..

The Netherlands receives ~180 kW of additional sunshine for each hectare of its surface.

That the day and night, 365-day average.
Image
You can access the European cloud and sunshine data here.

The East-West difference in 2024 was quite remarkable. The extremely warm North Atlantic likely played a role.

Also see the figures for 2023, which didn't show this anomaly.
climate.copernicus.eu/esotc/2024/clo…Image
Image
Image
Image
Read 4 tweets
Mar 16
NASA: Global Sea Level Rise increased more than expected in 2024.

0.59 cm might not sound like much, but 2/3rds of that was due to thermal ocean expansion.

Which takes about 50 times more heat to increase sea levels than melting land-ice does!
1/ Image
Ice melt: ~1.5 ZJ = 1 cm
Ocean heat: ~73 ZJ = 1 cm

We can use this to get a rough indication of Earth's Energy Imbalance in 2024:

(0.59 cm * 2 / 3 * 73 ZJ) + (0.59 cm * (1 / 3) * 1.5 ZJ) = about 29 ZJ of heat to increase sea levels by 0.59 cm.

Which is +1.80 W/m² globaly!

2/ Image
This shows the acceleration of Ocean Heat Content increase from models (SSP) and observations.

The orange Hakuba et al. (2021) bar shows OHC increase determined from rising sea levels ('Geodetic').

Like NASA CERES satellite data, its best estimate is out of range of models.
3/ Image
Read 5 tweets
Feb 4
Global Warming Has Accelerated
Are the United Nations and the Public Well-Informed?
[No!]

Notes from the presentation of this groundbreaking new paper by James Hansen (@DrJamesEHansen) et al. (2025), with leading climate scientists:

🧵
1/Image
@DrJamesEHansen Global warming has accelerated, which can't be explained by natural variability Image
@DrJamesEHansen The anthropogenic forcings are greenhouse gases and aerosols.

Aerosols are likely understimated by the IPCC Image
Read 46 tweets
Jan 27
Fossil fuels contain sulphur, which is released when burned. Scientists have known about the cooling effect of sulphur for decades.

This partially hides greenhouse gas warming.

But the scale of cooling and the decoupling of CO₂ and SO₂ emissions has been underestimated Image
As more and more clean air regulations came into effect from the 1960s onward, CO₂ and sulphur dioxide (SO₂) emissions gradually decoupled.

SO₂ emissions reached a global peak around 1980:
academic.oup.com/bioscience/art…Image
@WilliamJRipple This scatter plot clearly shows the decoupling between CO₂ and SO₂: Image
Read 14 tweets
Dec 29, 2024
🌊🌡️📈
The North Atlantic Ocean is not cooling back down.

The baseline has shifted.

We'll discuss this and more later today on Climate Chat. Image
2024 even broke the extreme Sea Surface Temperature record of 2023: Image
Unprecedented: Image
Read 8 tweets
Dec 16, 2024
The Atlantic Ocean used to transport about 500,000,000 Hiroshima bombs worth of heat northward.

This will decrease by ~30% in OUR lifetimes.

What does that mean?

I think the main problem with climate change is that our tiny brains are incapable of comprehending it.
I tried to cover the basic AMOC maths here:

patreon.com/posts/10867891…
Read 4 tweets

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