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#atmosphere

12 posts10 participants0 posts today
Replied to The Nexus of Privacy
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
Replied to The Nexus of Privacy
Public *
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
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formuchdeliberation

The Japan Times: Clouds changing as world warms, adding to climate uncertainty…

Some clouds are rising higher into the atmosphere, where they trap more heat. Others are reflecting less sunlight, or shrinking and allowing more solar energy to reach Earth's surface... #environment #climatechange #clouds #atmosphere #space

formuchdeliberation.wordpress.

for much deliberation · The Japan Times: Clouds changing as world warms, adding to climate uncertainty…Some clouds are rising higher into the atmosphere, where they trap more heat. Others are reflecting less sunlight, or shrinking and allowing more solar energy to reach Earth’s surface… …
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BrunoMcGee

All sorts of #toxic materials are released into the #atmosphere when buildings and their contents #burn. It's why one sees urban #firefighters donning breathing apparatus. #Wildlands adjacent to the Los Angeles basin also contain #mercury and #lead in #soil and litter layers, deposited over many years from #air #pollution generated by vehicles and industries. #Wildfires often emit these heavy metals.

nytimes.com/2025/03/28/well/la

The New York Times · L.A. Firefighters Who Fought Blazes Show Elevated Mercury and Lead LevelsBy Maggie Astor
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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
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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

Ars Technica · 3D map of exoplanet atmosphere shows wacky climateBy Jennifer Ouellette
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Claude Trudel

Botanique
🔸 Il y a un demi-milliard d’années, les plantes, jusqu’alors aquatiques, partaient à la conquête des continents. Une transition qui a métamorphosé la Terre et son atmosphère, ouvrant la voie aux vertébrés terrestres. Des chercheurs ont reconstitué le scénario de cette révolution.
Par Kheira Bettayeb.
lejournal.cnrs.fr/articles/pla
#botanique #plantes #évolution #science #biologie #eau #Terre #atmosphère #histoire #révolution

CNRS Le journalEt les plantes colonisèrent la terre ferme…Il y a un demi-milliard d’années, les plantes, encore aquatiques, partaient à la conquête des continents. Une transition qui a métamorphosé la Terre et son atmosphère, ouvrant la voie aux vertébrés terrestres. Des chercheurs ont reconstitué le scénario de cette révolution.
Public
formuchdeliberation

Sand-sized fossils hold secrets to the history of climate change…

Between 18,000 and 11,000 years ago, the amount of #carbondioxide in the #atmosphere suddenly shot up. This caused rapid global warming, the mass melting of #glaciers, and the end of the last ice age... #climatechange #globalwarming #photosynthesis #fossils #southernocean #iceage

formuchdeliberation.wordpress.

for much deliberation · Sand-sized fossils hold secrets to the history of climate change…Between 18,000 and 11,000 years ago, the amount of #carbondioxide in the #atmosphere suddenly shot up. This caused rapid global warming, the mass melting of #glaciers, and the end of the last ice a…
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Nando161

"Chainsaws and #fossilfuel #pollution are cranking open the floodgates that hold back this enormous reservoir of #forest carbon.

What started as a trickle a couple of decades ago has turned into a flood. Billions of tonnes of #CO2 that were locked away in the forest have already drained back out on the backs of #logging #trucks and in the swirling smoke of ever more monstrous #wildfires. This outpouring of forest carbon back into the #atmosphere now dwarfs..."

nationalobserver.com/2025/02/1

Canada's National Observer · Canada is opening the floodgates on one of Earth’s greatest living reservoirs of CO2Canada’s forest is in trouble – and so are we. Chainsaws and fossil fuel burning are draining billions of tonnes of CO2 out of our managed forest and pouring it back into the atmosphere. And the outflow is accelerating.
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Jeff
View from my driveway tonight. With these auroral bands, you have a maximum level of energy that is stored in the earths magnetic field. When these maximum levels are reached, it creates a breakup, or otherwise known as a corona. Where the magnetic bands swirl and break apart, releasing the concentrated energy into a more broad, mist like auroral haze.
But for those few minutes of eye watering wonder, it’s quite a good time.


#aurora #northernlights #spaceweather #atmosphere #auroraborealis #winter #stars #astrophotography #homesweethome #backyard
#backyard
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Mikko Tuomi

The upcoming extremely large telescopes will provide the first opportunity to search for signs of #habitability and #life on non-transiting #terrestrial #exoplanets.

For the most accessible nearby target, #Proxima Centauri b, we may be able to rule out a sub-Neptune #atmosphere in as little as a single hour of observing, and some #biosignature disequilibrium pairs may be accessible in 10 hours.

#astronomy #astrobiology
arxiv.org/abs/2503.08592

arXiv.orgThere's more to life in reflected light: Simulating the detectability of a range of molecules for high-contrast, high-resolution observations of non-transiting terrestrial exoplanetsThe upcoming extremely large telescopes will provide the first opportunity to search for signs of habitability and life on non-transiting terrestrial exoplanets using high-contrast, high-resolution instrumentation. However, the suite of atmospheric gases in terrestrial exoplanet environments that are accessible to ground-based reflected light observations has not been thoroughly explored. In this work, we use an upgraded Extremely Large Telescope (ELT) detectability pipeline to simulate the detectability of gases that can serve as habitability markers, potential biosignatures, and false positive discriminants in the atmospheres of Earth-sized and sub-Neptune planets. We calculate molecular detectability for five photochemically self-consistent atmosphere types, including the modern and Archean Earth, uninhabited biosignature ``false positive'' environments, and a sub-Neptune, over a grid of observational configurations for non-transiting targets within 10pc of Earth. For the most accessible nearby target, Proxima Centauri b, our results suggest that we may be able to rule out a sub-Neptune atmosphere in as little as a single hour of observing, and two biosignature disequilibrium pairs (O$_2$/CH$_4$ and CO$_2$/CH$_4$) may be accessible in $\sim 10$ hours for the most optimistic scenario. It may also be possible to discriminate uninhabited worlds, and rule out biosignature false positives by identifying contextual indicators (CO and H$_2$O) of abiotic O$_2$ and/or CH$_4$ buildup on similar timescales. In the near term, ELT reflected light observations will likely allow us to characterize multiple nearby terrestrial atmospheres, and ultimately search for signs of habitability and life.
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Dr. John Barentine FRAS

A couple of abstracts relevant to the space environment from the upcoming European Geosciences Union (Vienna, 27 April–2 May 2025):

“Defining the environmental impacts of satellite megaconstellation missions in a rapidly growing space sector” meetingorganizer.copernicus.or

“Survey of the estimated mass of ablated material and intact debris from ‘end-of-life’ LEO spacecraft entering the atmosphere” meetingorganizer.copernicus.or

meetingorganizer.copernicus.orgAbstract EGU25-17301
#Space#Spacecraft#SpaceEnvironment
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