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#atmosphere

5 posts5 participants1 post today
Public
Mikko Tuomi

Astronomers have detected the most promising signs yet of a possible #biosignature outside the solar system, although they remain cautious.

They have detected the chemical fingerprints of dimethyl sulfide and/or dimethyl disulfide, in the #atmosphere of the #exoplanet K2-18b, which orbits its star in the #habitable zone.

On Earth, theyare only produced by #life, primarily microbial life such as marine phytoplankton.

#astronomy #astrobiology
cam.ac.uk/stories/strongest-hi

University of CambridgeStrongest hints yet of biological activity outside the solar systemAstronomers have detected the most promising signs yet of a possible biosignature outside the solar system, although they remain cautious.
Replied in thread
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leChris :mastodon:

@andreasgoebel
Nein, so pessimistisch scheint die Lage laut dieser Quelle¹ nicht - Zitat:

"... Es wird geschätzt, dass 50 % eines CO2-Anstiegs innerhalb von 30 Jahren aus der Atmosphäre entfernt werden, weitere 30 % im Laufe einiger Jahrhunderte, und die restlichen 20 % könnten über Tausende von Jahren in der Atmosphäre verbleiben."

aber es heißt auch:

" ... Die atmosphärische Lebensdauer von Kohlendioxid ist besonders komplex und Gegenstand umfangreicher Studien und Debatten."

Link: sigmaearth.com/de/atmosph%C3%A

@rahmstorf
@Bergmolch

Sigma Earth · Atmosphärische Lebensdauer von Kohlendioxid und anderen Treibhausgasen – Sigma EarthDie Treibhausgase (THGs) und ihre Auswirkungen auf den Klimawandel stehen heute im Mittelpunkt der Umweltdiskussion. Entdecken Sie in diesem Artikel die atmosphärische Lebensdauer von Kohlendioxid und anderen Treibhausgasen.
#klimawandel#co2#atmosphere
Continued thread
Public
The Nexus of Privacy

Here's a few specific questions I have ... very interested in hearing people's thoughts! If you'd prefer to respond anonymously, here's a CryptPad form (it takes a few seconds to load, so don't panic; and it's kind of long, but all the questions are optional).

  • What examples have you seen of successfully leveraging social networks for organizing and mutual aid? (It's fine to include examples from centralized commercial social networks as well as alternative and/or decentralized social networks)

  • How could social networks better support organizing and mutual aid?

  • What do you see as the most promising and/or urgent short-term opportunities?

  • Are there relevant studies, articles, papers, books, videos, and/or podcasts?

And if you'd like to get involved, you can leave your contact info in the form and we'll follow up with you once there are some concrete next steps in place. (Although you're also welcome to fill out the form anonymously!)

cryptpad.frEncrypted FormCryptPad: end-to-end encrypted collaboration suite
#organizing#fediverse#ATmosphere
Continued thread
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The Nexus of Privacy

More notes on Organizing, Mutual Aid, and Activism on decentralized social networks

privacy.thenexus.today/more-no

This was originally going to be a #FediForum session ... oh well. But why let the FediForum organizers' screwups sabotage a worthwhile conversation? We decided to go ahead with the discussion anyhow. Here's the notes.

Feedback welcome! There are some specific questions in the reply, or here's a CryptPad form if you'd rather give feedback anonymously, but I'm also interested in reactions to topics we discussed in the meeting -- and thoughts in general!

The Nexus Of Privacy · More notes on Organizing, Mutual Aid, and Activism on decentralized social networks"Mutual aid. Organizing. Sharing, contextualizing, and making meaning of news and health information to counter propaganda and information overload. The use cases for alternative social networks – not controlled by techbro white supremacist CEO's working with their cronies in authoritarian governments – practically write themselves in today's world. And with so many
#organizing#fediverse#ATmosphere
Public
Space Environmentalism

New research on effects of reentries of 1000's of satellites on the Earth's #atmosphere: "We find that depending on reentry latitude and aerosol size distribution, a 20–40-Gg stratospheric burden of Al2O3 aerosols accumulates poleward of 30 N/S between 10 and 30 km. Small but statistically significant changes in mesospheric heating rates lead to 1.5 K-temperature anomalies in the mesosphere and the stratosphere at Southern Hemisphere high latitudes."

agupubs.onlinelibrary.wiley.co

#SpaceEnvironment
Public
Jennifer Lynn Bartlett

Joanne Simpson (1923-2010)
1st woman in the U.S. to earn a #meteorology PhD
#pilot

her research & models revolutionized our understanding of #clouds & #hurricanes, helping to shape modern #weather forecasting

Photograph: Dr. Joanne Simpson (1923–2010) pores over reams of images of tropical clouds filmed during flights across the tropical Pacific. courtesy Schlesinger Library

black & white photograph of woman using a slide rule while sitting in chair at a table covered in papers
#WomensHistoryMonth#HistSci#WomeninSTEM
Public
Mikko Tuomi

The common mini-Neptunes typically form with a #hydrogen #atmosphere, resulting in conditions where #hydrogen and the #planet’s molten interior interact for millions to billions of years.

But the temperatures and pressures involved are so extreme that laboratory experiments to study them are nearly impossible.

Water and hydrogen would begin to separate deep within the atmosphere leading to rainfall deep inside the planet’s atmosphere as heavier water sinks.

astrobiology.com/2025/03/atmos

Astrobiology · Atmospheres Of New Planets Might Have Unexpected Mixtures Of Hydrogen And Water - AstrobiologyRecent studies show that the most common type of planets in our galaxy typically form with a hydrogen atmosphere
Public
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

3D map of #exoplanet #atmosphere shows wacky climate
#Astronomers have mapped the 3D structure of the layered atmosphere of one such ultra-hot #Jupiter-size exoplanet, revealing powerful winds that create intricate #weather patterns across that atmosphere.
"This planet’s atmosphere behaves in ways that challenge our understanding of how weather works."
#Astronomy and #Astrophysics reported on unexpected identification of #titanium in the exoplanet's atmosphere as well.
arstechnica.com/science/2025/0

The 3D structure of the atmosphere of the exoplanet Tylos
Ars Technica · 3D map of exoplanet atmosphere shows wacky climateBy Jennifer Ouellette
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