Climate Diversity in the Solar-Like Habitable Zone due to Varying Background Gas Pressure

Abstract

A large number of studies have responded to the growing body of confirmed terrestrial habitable zone exoplanets by presenting models of various possible climates. However, the impact of the partial pressure of background gases such as N${}_2$ has not yet been well-explored, despite the abundance of N${}_2$ in Earth's atmosphere and the lack of constraints on its typical abundance in terrestrial planet atmospheres. We use PlaSim, a fast 3D climate model, to simulate many hundreds of climates around Sun-like stars with varying N${}_2$ partial pressures, instellations, and surface characteristics to identify the impact of the background gas partial pressure on the climate. We find that the climate's response is nonlinear and highly sensitive to the background gas partial pressure. We identify pressure broadening of greenhouse gas (such as CO${}_2$ and H${}_2$O) absorption lines, amplification of warming or cooling by the water vapor greenhouse positive feedback, heat transport efficiency, and cooling through Rayleigh scattering as the dominant competing mechanisms that determine the equilibrium climate for a given N${}_2$ partial pressure. Finally, we show that different amounts of N${}_2$ should have a significant effect on broadband reflected light observations of terrestrial exoplanets around Sun-like stars.

arXiv commentRevised; accepted for publication in Icarus. 45 pages, 15 figures, 2 tables

References in corpus (46)

• Habitable Zones Around Main-Sequence Stars: New Estimates
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• Atmospheric Retrieval for Super-Earths: Uniquely Constraining the Atmospheric Composition with Transmission Spectroscopy
• Stabilizing Cloud Feedback Dramatically Expands the Habitable Zone of Tidally Locked Planets
• Increased insolation threshold for runaway greenhouse processes on Earth like planets
• Spectral Evolution of an Earth-Like Planet
• The habitability of Proxima Centauri b II. Possible climates and Observability
• Strong Dependence of the Inner Edge of the Habitable Zone on Planetary Rotation Rate
• Combining high-dispersion spectroscopy (HDS) with high contrast imaging (HCI): Probing rocky planets around our nearest neighbors
• Abiotic oxygen-dominated atmospheres on terrestrial habitable zone planets
• The Nitrogen Budget of Earth
• Assessing the Habitability of the TRAPPIST-1 System Using a 3D Climate Model
• Habitable Moist Atmospheres On Terrestrial Planets Near the Inner Edge Of the Habitable Zone Around M-dwarfs
• Modelling climate diversity, tidal dynamics and the fate of volatiles on TRAPPIST-1 planets
• Exploring the faint young Sun problem and the possible climates of the Archean Earth with a 3-D GCM
• Atmospheric dynamics of terrestrial exoplanets over a wide range of orbital and atmospheric parameters
• Lower Limits on Aperture Size for an ExoEarth-Detecting Coronagraphic Mission
• Pale Orange Dots: The Impact of Organic Haze on the Habitability and Detectability of Earthlike Exoplanets
• Exploring the climate of Proxima B with the Met Office Unified Model
• Resolving Orbital and Climate Keys of Earth and Extraterrestrial Environments with Dynamics 1.0: A General Circulation Model for Simulating the Climates of Rocky Planets
• Habitable Climate Scenarios for Proxima Centauri b With a Dynamic Ocean
• Demarcating circulation regimes of synchronously rotating terrestrial planets within the habitable zone
• Primary and secondary eclipse spectroscopy with JWST: exploring the exoplanet parameter space
• Bistability of the climate around the habitable zone: a thermodynamic investigation
• The atmospheric circulation and climate of terrestrial planets orbiting Sun-like and M-dwarf stars over a broad range of planetary parameters
• Water-Trapped Worlds
• A more comprehensive habitable zone for finding life on other planets
• Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array
• Atmospheric nitrogen evolution on Earth and Venus
• No snowball on habitable tidally locked planets
• Modeling pN2 through Geological Time: Implications for Planetary Climates and Atmospheric Biosignatures
• The habitable zone of Earth-like planets with different levels of atmospheric pressure
• NIR-Driven Moist Upper Atmospheres of Synchronously Rotating Temperate Terrestrial Exoplanets
• Telling twins apart: Exo-Earths and Venuses with transit spectroscopy
• Simulations of Water Vapor and Clouds on Rapidly Rotating and Tidally Locked Planets: a 3D Model Intercomparison
• The Effect of Orbital Configuration on the Possible Climates and Habitability of Kepler-62f
• Biosignature Anisotropy Modeled on Temperate Tidally Locked M-dwarf Planets
• Hot Hydrogen Climates near the inner edge of the Habitable Zone
• GCM Simulations of Unstable Climates in the Habitable Zone
• A secular increase in continental crust nitrogen during the Precambrian
• Runaway climate cooling of ocean planets in the habitable zone: a consequence of seafloor weathering enhanced by melting of high-pressure ice
• Habitable Snowballs: Temperate Land Conditions, Liquid Water, and Implications for CO${}_2$ Weathering
• Decrease in hysteresis of planetary climate for planets with long solar days
• The effect of varying atmospheric pressure upon habitability and biosignatures of Earth-like planets
• Habitability from Tidally-Induced Tectonics
• Climate Sensitivity to Carbon Dioxide and Moist Greenhouse threshold of Earth-like planets under an increasing solar forcing

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• High-Resolution spectral models of TRAPPIST-1e seen as a Pale Blue Dot for ELT and JWST observations
• Fundamental Challenges to Remote Sensing of Exo-Earths
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• Assessing the Climate and Habitability of Tidally Locked Rocky Exoplanets
• Chemistry, Climate, and Transmission Spectra of TRAPPIST-1 e Explored with a Multimodel Sparse Sampled Ensemble
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