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Leon Simons @leonsimons.bsky.social · 6m

Can you see it now?

Reposted by Leon Simons

Leon Simons @leonsimons.bsky.social · 5h

See YouTube link for time in your region and subscribe and hit the bell button to get a notification when we go live 🔔
www.youtube.com/live/CRy0SsN...

Northern/Southern Hemisphere Warming Asymmetry

YouTube video by Climate Chat

www.youtube.com

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Leon Simons @leonsimons.bsky.social · 3h

Gaat ook niet altijd van harte heb ik me laten vertellen.

Komt veel op individuen aan.

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Leon Simons @leonsimons.bsky.social · 5h

See YouTube link for time in your region and subscribe and hit the bell button to get a notification when we go live 🔔
www.youtube.com/live/CRy0SsN...

Northern/Southern Hemisphere Warming Asymmetry

YouTube video by Climate Chat

www.youtube.com

1 3 10

Leon Simons @leonsimons.bsky.social · 5h

The Northern Hemisphere used to radiate more heat to space than it absorbed from the sun, but this changed over the past 20 years.

More later today on Climate Chat:
www.patreon.com/posts/northe...

Northern/Southern Hemisphere Warming Asymmetry | Leon Simons

Get more from Leon Simons on Patreon

www.patreon.com

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Leon Simons @leonsimons.bsky.social · 7h

Ja, Özden weet veel mensen te bereiken.

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Reposted by Leon Simons

Dan Miller @danmiller999.bsky.social · 19h

Sunday 10/12 at 10am PT on Climate Chat: "Northern/Southern Hemisphere Warming Asymmetry" with co-host @leonsimons.bsky.social. On YouTube and LinkedIn.
#ClimateCrisis #ClimateAction
@bikingmzstacey.bsky.social @radsci.bsky.social
youtube.com/live/CRy0SsN...

Northern/Southern Hemisphere Warming Asymmetry

YouTube video by Climate Chat

youtube.com

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Leon Simons @leonsimons.bsky.social · 23h

Thank you Özden, great summary!

Are you referring to a new Eumetsat study here or highlighting their broader research?

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Leon Simons @leonsimons.bsky.social · 23h

Even if you don't speak German, the visuals are clear.

To summarize:
The main maritime stratocumulous cloud regions are becoming darker as clouds evaporate, leading to more and faster warming, which causes global weather impacts.

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Leon Simons @leonsimons.bsky.social · 23h

Great one minute summary of the climate impact from decreasing maritime stratocumulous clouds.

Above warmer oceans, clouds evaporate faster, exposing the dark ocean to direct sunlight, leading to even more warming.

And decreased air pollution from ships reduces cloud droplets and their size:

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Leon Simons @leonsimons.bsky.social · 2d

🤣 😭

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Reposted by Leon Simons

Robbie Andrew @robbieandrew.bsky.social · 3d

NOAA data show Mauna Loa was about to be deluged, but perhaps the US government shutdown has saved it just in time?
robbieandrew.github.io/ppm/

Graph showing: Weekly atmospheric CO2 at Mauna Loa, in the style of Hokusai.

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Leon Simons @leonsimons.bsky.social · 3d

The updated 12-month global average sea ice extent has somewhat less variability and shows a clear indication of accelerated sea ice loss:

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Reposted by Leon Simons

Leon Simons @leonsimons.bsky.social · 3d

From the pre-deforestation baseline, CO₂ equivalent greenhouse gas concentration is now about 590 ppm:

Find a high-resolution PDF version of this graph on @researchgate.bsky.social:
www.researchgate.net/publication/...

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Leon Simons @leonsimons.bsky.social · 3d

573 ppm CO₂ equivalent, taking into account other greenhouse gases and converting them to an equivalent CO₂ concentration.

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Leon Simons @leonsimons.bsky.social · 3d

From the pre-deforestation baseline, CO₂ equivalent greenhouse gas concentration is now about 590 ppm:

Find a high-resolution PDF version of this graph on @researchgate.bsky.social:
www.researchgate.net/publication/...

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Leon Simons @leonsimons.bsky.social · 3d

We probably need to go back to ~350 ppm CO₂ equivalent for temperatures to stop rising.

We are now above 573 ppm (GHG forcing of +4.1 W/m²).

That's without aerosols cooling things down.

There's too much uncertainty to be sure, but going back to 350 ppm is already a Herculean task.

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Leon Simons @leonsimons.bsky.social · 4d

Link:
agupubs.onlinelibrary.wiley.com/doi/10.1029/...

Earth's Energy Imbalance More Than Doubled in Recent Decades

Earth's energy imbalance more than doubled in recent decades The large trend has taken us by surprise, and as a community we should strive to understand the underlying causes Our capability to o...

agupubs.onlinelibrary.wiley.com

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Leon Simons @leonsimons.bsky.social · 4d

"together with funding agencies and policy makers, we must strive to secure a robust and reliable capability to
observe the energy imbalance—the perhaps most fundamental quantity in the climate system—during this pivotal
moment in history."

bsky.app/profile/leon...

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Leon Simons @leonsimons.bsky.social · 4d

Head of NASA CERES, Norman Loeb explained during his presentation of our (@drjamesehansen.bsky.social et al.) paper that more CERES satellites are required for data security and accuracy.

Smaller and cheaper satellites have already been developed.

See timestamped link:
youtu.be/NXDWpBlPCY8?...

An Intimate Conversation with Leading Climate Scientists To Discuss New Research on Global Warming

YouTube video by SDSN

youtu.be

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Leon Simons @leonsimons.bsky.social · 4d

'Our capability to observe the Earth's energy imbalance and budget terms is threatened as satellites are decommissioned'

And now it's (temporarily? 🤞) not being updated.

We need more CERES satellites.

Can @esa.int @esaclimate.bsky.social @ecmwf.int and others help?
@carlobuontempo.bsky.social

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Reposted by Leon Simons

Leon Simons @leonsimons.bsky.social · 4d

Also see this new study:

'Emerging hemispheric asymmetry of Earth’s radiation'

Norman Loeb, Tyler Thorsen , Seiji Kato, @fredrosemn.bsky.social, Øivind Hodnebrog, and @gunnarmy.bsky.social

www.pnas.org/doi/10.1073/...

Emerging hemispheric asymmetry of Earth’s radiation | PNAS

Twenty-four years of satellite observations from the Clouds and the Earth’s Radiant Energy System show a northern hemisphere (NH) minus southern he...

www.pnas.org

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Leon Simons @leonsimons.bsky.social · 4d

There's no funding at the moment..

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Leon Simons @leonsimons.bsky.social · 4d

Also see this new study:

'Emerging hemispheric asymmetry of Earth’s radiation'

Norman Loeb, Tyler Thorsen , Seiji Kato, @fredrosemn.bsky.social, Øivind Hodnebrog, and @gunnarmy.bsky.social

www.pnas.org/doi/10.1073/...

Emerging hemispheric asymmetry of Earth’s radiation | PNAS

Twenty-four years of satellite observations from the Clouds and the Earth’s Radiant Energy System show a northern hemisphere (NH) minus southern he...

www.pnas.org

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Leon Simons @leonsimons.bsky.social · 4d

Which is what we expect from a stronger Northern Hemisphere aerosol forcing and cloud feedback impacts.
5/

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