Measurements and semi-empirical calculations of CO2+CH4 and CO2+H2 collision-induced absorption across a wide range of wavelengths and temperatures. Application for the prediction of early Mars surface temperature
arXiv:1912.05630 · doi:10.1016/j.icarus.2020.113762
Abstract
Reducing atmospheres have recently emerged as a promising scenario to warm the surface of early Mars enough to drive the formation of valley networks and other ancient aqueous features that have been detected so far on the surface of Mars. Here we present a series of experiments and calculations to better constrain CO2+CH4 and CO2+H2 collision-induced absorptions (CIAs) as well as their effect on the prediction of early Mars surface temperature. First, we carried out a new set of experimental measurements (using the AILES line of the SOLEIL synchrotron) of both CO2+CH4 and CO2+H2 CIAs. These measurements confirm the previous results of Turbet et al. 2019, Icarus vol. 321, while significantly reducing the experimental uncertainties. Secondly, we fitted a semi-empirical model to these CIAs measurements, allowing us to compute the CO2+CH4 and CO2+H2 CIAs across a broad spectral domain (0-1500cm-1) and for a wide range of temperatures (100-600K). Last, we performed 1-D numerical radiative-convective climate calculations (using the LMD Generic Model) to compute the surface temperature expected on the surface of early Mars for several CO2, CH4 and H2 atmospheric contents, taking into account the radiative effect of these revised CIAs. These calculations demonstrate that thick CO2+H2-dominated atmospheres remain a viable solution for warming the surface of Mars above the melting point of water, but not CO2+CH4-dominated atmospheres. Our calculated CO2+CH4 and CO2+H2 CIA spectra and predicted early Mars surface temperatures are provided to the community for future uses.
Accepted for publication in Icarus. CO2+H2 and CO2+CH4 CIAs calculated tables (HITRAN format) - as well as predicted early Mars surface temperatures - are available on demand. They are also available for download on Icarus
References in corpus (15)
- The Climate of Early Mars
- Global modelling of the early Martian climate under a denser CO2 atmosphere: Water cycle and ice evolution
- 3D modelling of the early Martian Climate under a denser CO2 atmosphere: Temperatures and CO2 ice clouds
- Warming early Mars with CO2 and H2
- Transient reducing greenhouse warming on early Mars
- Comparison of "warm and wet" and "cold and icy" scenarios for early Mars in a 3D climate model
- The geological and climatological case for a warmer and wetter early Mars
- Low paleopressure of the Martian atmosphere estimated from the size distribution of ancient craters
- A warmer and wetter solution for early Mars and the challenges with transient warming
- Testing the Early Mars H2-CO2 Greenhouse Hypothesis with a 1-D Photochemical Model
- 3D Modelling of the climatic impact of outflow channel formation events on Early Mars
- Far infrared measurements of absorptions by CH4+CO2 and H2+CO2 mixtures and implications for greenhouse warming on early Mars
- The environmental effects of very large bolide impacts on early Mars explored with a hierarchy of numerical models
- The paradoxes of the Late Hesperian Mars ocean
- Comment on 'Radiative transfer in CO2-rich atmospheres: 1. Collisional line mixing implies a colder early Mars'
Cited by in corpus (17)
- A coupled model of episodic warming, oxidation and geochemical transitions on early Mars
- A review of possible planetary atmospheres in the TRAPPIST-1 system
- HST/WFC3 transmission spectroscopy of the cold rocky planet TRAPPIST-1h
- Circumpolar ocean stability on Mars 3 Gy ago
- Early Mars' habitability and global cooling by H2-based methanogens
- Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications
- Warming Early Mars with Climate Cycling: The Effect of CO2-H2 Collision-induced Absorption
- Changing spatial distribution of water flow charts major change in Mars' greenhouse effect
- Dynamics of the Great Oxidation Event from a 3D photochemical-climate model
- 3D simulations of the Archean Earth including photochemical haze profiles
- Narrow loophole for H2-dominated atmospheres on habitable rocky planets around M dwarfs
- 3D simulations of TRAPPIST-1e with varying CO2, CH4 and haze profiles
- 3D climate simulations of the Archean find that methane has a strong cooling effect at high concentrations
- On the importance of laboratory experiments for interpreting exoplanet observations
- Evolution and Observable Properties of Rocky Planet Atmospheres
- Behaviors of Martian CO2-driven dry climate system and conditions for atmospheric collapses
- High-CO2 Climates and Observables in the Outer Habitable Zone