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Black carbon lofts wildfire smoke high into the stratosphere to form a persistent plume
The observed rapid plume rise, latitudinal spread, and photochemical reactions provide new insights into potential global climate impacts from nuclear war.
The evolution of habitable climates under the brightening Sun
On water‐dominated planets, warming from increased solar insolation is strongly amplified by the water vapor greenhouse feedback. As the Sun brightens due to stellar evolution, Earth will become…
Assessing the Habitability of the TRAPPIST-1 System Using a 3D Climate Model
- E. Wolf
- Geology, Physics
- 16 March 2017
The TRAPPIST-1 system provides an extraordinary opportunity to study multiple terrestrial extrasolar planets and their atmospheres. Here we use the National Center for Atmospheric Research Community…
Fractal Organic Hazes Provided an Ultraviolet Shield for Early Earth
A fractal aggregate haze was found to be optically thick in the ultraviolet wavelengths while remaining relatively transparent in the mid-visible wavelengths, which would have provided a strong shield against ultraviolet light while causing only minimal antigreenhouse cooling.
The Pale Orange Dot: The Spectrum and Habitability of Hazy Archean Earth
Coupled climate-photochemical-microphysical simulations demonstrate that hazes can cool the planet's surface by about 20 K, but habitable conditions with liquid surface water could be maintained with a relatively thick haze layer even with the fainter young Sun, and find that optically thicker hazes are self-limiting due to their self-shielding properties, preventing catastrophic cooling of the planet.
The inner edge of the habitable zone for synchronously rotating planets around low-mass stars using general circulation models
Terrestrial planets at the inner edge of the habitable zone of late-K and M-dwarf stars are expected to be in synchronous rotation, as a consequence of strong tidal interactions with their host…
Pale Orange Dots: The Impact of Organic Haze on the Habitability and Detectability of Earthlike Exoplanets
Hazes are common in known planet atmospheres, and geochemical evidence suggests early Earth occasionally supported an organic haze with significant environmental and spectral consequences. The UV…
Habitable Moist Atmospheres On Terrestrial Planets Near the Inner Edge Of the Habitable Zone Around M-dwarfs
Terrestrial planets in the habitable zones (HZs) of low-mass stars and cool dwarfs have received significant scrutiny recently because their shorter orbital periods increase their chances of…
Delayed onset of runaway and moist greenhouse climates for Earth
As the Sun slowly grows brighter over its main sequence lifetime, habitability on Earth's surface will eventually become threatened probably leading to moist and then runaway greenhouse climates.…
Hospitable archean climates simulated by a general circulation model.
The results indicate that a weak version of the faint young Sun paradox, requiring only that some portion of the planet's surface maintain liquid water, may be resolved with moderate greenhouse gas inventories, and hospitable late Archean climates are easily obtained in the climate model.