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Atmospheric Science

All articles tagged with #atmospheric science

Coldest Known Lava World, HD 3167 b, Defies Expectations by Retaining an Atmosphere
science11 days ago

Coldest Known Lava World, HD 3167 b, Defies Expectations by Retaining an Atmosphere

Astronomers have identified HD 3167 b, a rocky super-Earth located 154 light-years away, as the coldest known lava world with evidence of an atmosphere. Despite orbiting its host star in just one Earth day, the planet retains an atmosphere, defying expectations that such close proximity would strip away gases. This discovery, published in The Astrophysical Journal Letters, provides a critical data point for understanding the temperature threshold at which rocky planets lose their atmospheres and offers insights into the early, molten stages of Earth's formation.

via Space|
#atmospheric-science#exoplanets#james-webb-space-telescope
atmospheric-science3 months ago

MSA speeds up cold-region aerosol formation, reshaping climate projections

A CERN CLOUD chamber study shows methanesulfonic acid (MSA) nucleates with ammonia below −10 °C at rates comparable to sulfuric acid, and forms synergistic multi-acid clusters with SA. Even with very low ammonia, MSA drives particle growth near the kinetic limit below 9 °C at relative humidity above 40%. Since MSA and SA co-occur in cool marine regions, nucleation rates could be up to ten times faster and growth up to twofold compared with SA–NH3 alone, potentially boosting CCN concentrations, especially in polar regions. Global modeling indicates MSA is an important, currently underrepresented driver of biogenic particles in cool marine atmospheres, affecting present and pre-industrial climate.

via Nature|
#aerosol-nucleation#ammonia#atmospheric-science
Cracking the Ice Code: Ultrafast X‑ray Illuminates Early Freezing
science4 months ago

Cracking the Ice Code: Ultrafast X‑ray Illuminates Early Freezing

Using the European XFEL to watch the first microseconds of freezing, researchers show that disorder and impurities strongly influence nucleation, challenging classical nucleation theory; experiments on simple Lennard‑Jones liquids (krypton and argon) reveal rapid onset of crystalline order within micrometres and microseconds, with theory matching experiments only after refining assumptions. The work could improve climate models, cloud formation understanding, and insights into planetary interiors.

via Nature|
#atmospheric-science#crystallization#ice
Hawaii's Emerald Sunset: Airglow and Gravity Waves Explain the Green Sky
science5 months ago

Hawaii's Emerald Sunset: Airglow and Gravity Waves Explain the Green Sky

A mysterious green glow seen over Hawaii at sunset is explained as airglow—faint light from oxygen in the upper atmosphere—amplified and structured by gravity waves, visible mainly through cameras with long exposure rather than to the naked eye; satellites and auroras were ruled out, and scientists call for more public observations to better understand this subtle phenomenon.

via The Daily Galaxy|
#airglow#atmospheric-science#gravity-waves
Lightning in a Box Could Shrink Thunderstorms to Tabletop Size
science7 months ago

Lightning in a Box Could Shrink Thunderstorms to Tabletop Size

Penn State researchers propose a tiny, deck-of-cards-sized solid block that could replicate the electrical conditions of a thunderstorm, triggering lightning‑like radiation via a relativistic runaway electron avalanche. The “lightning‑in‑a‑box” is theoretical for now and would require experimental confirmation with common insulating materials; if proven feasible, it could let scientists study lightning at desktop scale, reducing the cost and scale of traditional field experiments.

via Gizmodo|
#atmospheric-science#high-energy#laboratory-research
Oceans Play a Bigger Role in Climate Cooling Than Expected
science1 year ago

Oceans Play a Bigger Role in Climate Cooling Than Expected

A new study published in Science Advances reveals that polar oceans emit sulfur gases, particularly methanethiol, which have a greater cooling effect on the climate than previously understood. This discovery, led by researchers from Spain and the UK, highlights the role of marine sulfur in cloud formation and its impact on solar radiation reflection, challenging existing climate models. The findings underscore the importance of accurately representing these emissions in climate predictions, aiding in more precise policy-making for global warming scenarios.

via Slashdot|
#atmospheric-science#climate-change#climate-models
NASA's Artificial Clouds Illuminate Norwegian Skies
science1 year ago

NASA's Artificial Clouds Illuminate Norwegian Skies

NASA conducted the Vorticity Experiment (VortEx) over Northern Norway, launching rockets that released glowing artificial clouds to study atmospheric turbulence and gravity waves. These clouds, created using trimethyl aluminum, served as visual markers to reveal energy flows between atmospheric layers, crucial for understanding weather and climate dynamics. The experiment, set against the northern lights, provided insights into the turbopause, a key atmospheric region, and has implications for both Earth and planetary science.

via The Daily Galaxy --Great Discoveries Channel|
#artificial-clouds#atmospheric-science#gravity-waves
NASA Captures Gravity Waves from Hurricane Helene 55 Miles Above Earth
science1 year ago

NASA Captures Gravity Waves from Hurricane Helene 55 Miles Above Earth

NASA's Atmospheric Waves Experiment aboard the International Space Station captured images of gravity waves generated by Hurricane Helene, highlighting the storm's intensity and the instrument's capabilities. Gravity waves, distinct from gravitational waves, are atmospheric ripples caused by natural phenomena like hurricanes. The data, visualized in infrared wavelengths, helps scientists understand the impact of terrestrial weather on space weather, which can affect low-Earth orbit instruments and communications. Helene, a Category 4 storm, caused significant damage in the southeastern U.S., including power outages and flooding.

via Gizmodo|
#atmospheric-science#gravity-waves#hurricane-helene