TY - GEN AB - The earliest atmospheres of rocky planets originate from extensive volatile release during magma ocean epochs that occur during assembly of the planet. These establish the initial distribution of the major volatile elements between different chemical reservoirs that subsequently evolve via geological cycles. Current theoretical techniques are limited in exploring the anticipated range of compositional and thermal scenarios of early planetary evolution, even though these are of prime importance to aid astronomical inferences on the environmental context and geological history of extrasolar planets. Here, we present a coupled numerical framework that links an evolutionary, vertically resolved model of the planetary silicate mantle with a radiative-convective model of the atmosphere. Using this method, we investigate the early evolution of idealized Earth-sized rocky planets with end-member, clear-sky atmospheres dominated by either H<sub>2</sub>, H<sub>2</sub>O, CO<sub>2</sub>, CH<sub>4</sub>, CO, O<sub>2</sub>, or N<sub>2</sub>. We find central metrics of early planetary evolution, such as energy gradient, sequence of mantle solidification, surface pressure, or vertical stratification of the atmosphere, to be intimately controlled by the dominant volatile and outgassing history of the planet. Thermal sequences fall into three general classes with increasing cooling timescale: CO, N<sub>2</sub>, and O<sub>2</sub> with minimal effect, H<sub>2</sub>O, CO<sub>2</sub>, and CH<sub>4</sub> with intermediate influence, and H<sub>2</sub> with several orders of magnitude increase in solidification time and atmosphere vertical stratification. Our numerical experiments exemplify the capabilities of the presented modeling framework and link the interior and atmospheric evolution of rocky exoplanets with multiwavelength astronomical observations. AD - University of Oxford AD - University of Bern AD - University of Chicago AD - University of Oxford AD - ETH Zurich AD - University of Oxford AD - University of Oxford AU - Lichtenberg, Tim AU - Bower, Dan J. AU - Hammond, Mark AU - Boukrouche, Ryan AU - Sanan, Patrick AU - Tsai, Shang-Min AU - Pierrehumbert, Raymond T. DA - 2021-01-17 ID - 14058 JF - Journal of Geophysical Research: Planets KW - Atmosphere origins KW - exoplanets KW - magma oceans KW - planet composition KW - planet formation and evolution KW - planetary surface L1 - https://knowledge.uchicago.edu/record/14058/files/JGR%20Planets%20-%202021%20-%20Lichtenberg%20-%20Vertically%20Resolved%20Magma%20Ocean%20Protoatmosphere%20Evolution%20%20H2%20%20H2O%20%20CO2%20%20CH4%20%20CO%20%20O2%20.pdf L2 - https://knowledge.uchicago.edu/record/14058/files/JGR%20Planets%20-%202021%20-%20Lichtenberg%20-%20Vertically%20Resolved%20Magma%20Ocean%20Protoatmosphere%20Evolution%20%20H2%20%20H2O%20%20CO2%20%20CH4%20%20CO%20%20O2%20.pdf L4 - https://knowledge.uchicago.edu/record/14058/files/JGR%20Planets%20-%202021%20-%20Lichtenberg%20-%20Vertically%20Resolved%20Magma%20Ocean%20Protoatmosphere%20Evolution%20%20H2%20%20H2O%20%20CO2%20%20CH4%20%20CO%20%20O2%20.pdf LA - eng LK - https://knowledge.uchicago.edu/record/14058/files/JGR%20Planets%20-%202021%20-%20Lichtenberg%20-%20Vertically%20Resolved%20Magma%20Ocean%20Protoatmosphere%20Evolution%20%20H2%20%20H2O%20%20CO2%20%20CH4%20%20CO%20%20O2%20.pdf N2 - The earliest atmospheres of rocky planets originate from extensive volatile release during magma ocean epochs that occur during assembly of the planet. These establish the initial distribution of the major volatile elements between different chemical reservoirs that subsequently evolve via geological cycles. Current theoretical techniques are limited in exploring the anticipated range of compositional and thermal scenarios of early planetary evolution, even though these are of prime importance to aid astronomical inferences on the environmental context and geological history of extrasolar planets. Here, we present a coupled numerical framework that links an evolutionary, vertically resolved model of the planetary silicate mantle with a radiative-convective model of the atmosphere. Using this method, we investigate the early evolution of idealized Earth-sized rocky planets with end-member, clear-sky atmospheres dominated by either H<sub>2</sub>, H<sub>2</sub>O, CO<sub>2</sub>, CH<sub>4</sub>, CO, O<sub>2</sub>, or N<sub>2</sub>. We find central metrics of early planetary evolution, such as energy gradient, sequence of mantle solidification, surface pressure, or vertical stratification of the atmosphere, to be intimately controlled by the dominant volatile and outgassing history of the planet. Thermal sequences fall into three general classes with increasing cooling timescale: CO, N<sub>2</sub>, and O<sub>2</sub> with minimal effect, H<sub>2</sub>O, CO<sub>2</sub>, and CH<sub>4</sub> with intermediate influence, and H<sub>2</sub> with several orders of magnitude increase in solidification time and atmosphere vertical stratification. Our numerical experiments exemplify the capabilities of the presented modeling framework and link the interior and atmospheric evolution of rocky exoplanets with multiwavelength astronomical observations. PY - 2021-01-17 T1 - Vertically Resolved Magma Ocean–Protoatmosphere Evolution: H<sub>2</sub>, H<sub>2</sub>O, CO<sub>2</sub>, CH<sub>4</sub>, CO, O<sub>2</sub>, and N<sub>2</sub> as Primary Absorbers TI - Vertically Resolved Magma Ocean–Protoatmosphere Evolution: H<sub>2</sub>, H<sub>2</sub>O, CO<sub>2</sub>, CH<sub>4</sub>, CO, O<sub>2</sub>, and N<sub>2</sub> as Primary Absorbers UR - https://knowledge.uchicago.edu/record/14058/files/JGR%20Planets%20-%202021%20-%20Lichtenberg%20-%20Vertically%20Resolved%20Magma%20Ocean%20Protoatmosphere%20Evolution%20%20H2%20%20H2O%20%20CO2%20%20CH4%20%20CO%20%20O2%20.pdf Y1 - 2021-01-17 ER -