Kepler-452b in a 3D Atmosphere–Ocean Climate Model: CO2 Limits, Silicate Weathering, and Long-Term Water Retention

To the point

Hu Yongyun, Wang Yuwei, Liu Yonggang, and Yang Jun show that Kepler-452b could be habitable only if its atmospheric CO2 stays at or below Earth’s present level, because without the natural CO2 removal from rock weathering the gas would accumulate and push the climate into an uninhabitable hot state, and they also assess whether the planet could keep its water over about 6 billion years.

The Extraterrestrial Species Almanac: The Ultimate Guide to Greys, Reptilians, Hybrids, and Nordics (MUFON)

Craig Campobasso

Atlas of Unidentified Flying Objects

Andy McGrillen

Comulytic Note Pro AI Voice Recorder, Unlimited Transcribe & Summarize

UFO Crash Retrievals: The Complete Investigation

Leonard Stringfield

Our recommendations from Amazon

harvard.edu

Climate and Habitability of Kepler 452b Simulated with a Fully Coupled Atmosphere-Ocean General Circulation Model

The discovery of Kepler 452b is a milestone in searching for habitable exoplanets. While it has been suggested that Kepler 452b is the first Earth-like exoplanet discovered in the habitable zone of a Sun-like star, its climate states and habitability require quantitative studies. Here, we first use a three-dimensional fully coupled atmosphere-ocean climate model to study the climate and habitability of an exoplanet around a Sun-like star. Our simulations show that Kepler 452b is habitable if COSUB2/SUB concentrations in its atmosphere are comparable or lower than that in the present-day Earth atmosphere. However, our simulations also suggest that Kepler 452b can become too hot to be habitable if there is the lack of silicate weathering to limit COSUB2/SUB concentrations in the atmosphere. We also address whether Kepler 452b could retain its water inventory after 6.0 billion years of lifetime. These results in the present Letter will provide insights about climate and habitability for other undiscovered exoplanets similar to Kepler 452b, which may be observable by future observational missions.