Results 21 to 30 of about 811,285 (331)

Strong Depletion of 13C in CO Induced by Photolysis of CO2 in the Martian Atmosphere, Calculated by a Photochemical Model

open access: yesThe Planetary Science Journal, 2023
The isotopic signature of atmospheric carbon offers a unique tracer for the history of the Martian atmosphere and the origin of organic matter on Mars. The photolysis of CO _2 is known to induce strong isotopic fractionation of the carbon between CO _2 ...
Tatsuya Yoshida   +9 more
doaj   +1 more source

Non-Thermal Nitric Oxide Formation in the Earth’s Polar Atmosphere

open access: yesAtmosphere, 2023
Auroral events are the prominent manifestation of solar/stellar forcing on planetary atmospheres because they are closely related to the stellar energy deposition by and evolution of planetary atmospheres.
Valery Shematovich   +2 more
doaj   +1 more source

Soft X-Ray-induced Dimerization of Methane

open access: yesThe Astrophysical Journal, 2023
Carbon 1s excitation of methane, CH _4 , has been studied in the gas phase using the ion trap integrated with the photon–ion instrument at PETRA III/DESY and soft X-rays from the beamline P04.
S. Reinwardt   +10 more
doaj   +1 more source

Global-mean Vertical Tracer Mixing in Planetary Atmospheres. I. Theory and Fast-rotating Planets [PDF]

open access: yesAstrophysical Journal, 2018
Most chemistry and cloud formation models for planetary atmospheres adopt a one-dimensional (1D) diffusion approach to approximate the global-mean vertical tracer transport.
Xi Zhang, A. Showman
semanticscholar   +1 more source

Depletion of 13C in CO in the Atmosphere of Mars Suggested by ExoMars-TGO/NOMAD Observations

open access: yesThe Planetary Science Journal, 2023
The atmosphere of Mars is mainly composed by carbon dioxide (CO _2 ). It has been predicted that photodissociation of CO _2 depletes ^13 C in carbon monoxide (CO).
S. Aoki   +21 more
doaj   +1 more source

Radiative transfer and inversion codes for characterizing planetary atmospheres: an overview

open access: yesFrontiers in Astronomy and Space Sciences, 2023
The study of planetary atmospheres is crucial for understanding the origin, evolution, and processes that shape celestial bodies like planets, moons and comets.
M. Rengel   +2 more
doaj   +1 more source

Susceptibility of planetary atmospheres to mass loss and growth by planetesimal impacts: the impact shoreline [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2019
This paper considers how planetesimal impacts affect planetary atmospheres. Atmosphere evolution depends on the ratio of gain from volatiles to loss from atmosphere stripping fv; for constant bombardment, atmospheres with fv < 1 are destroyed in finite
M. Wyatt, Q. Kral, C. Sinclair
semanticscholar   +1 more source

Study of atmospheres in the solar system, from stellar occultation or planetary transit

open access: yesComptes Rendus. Physique, 2022
Stellar occultations and transits occur when a planetary body passes in front of a star (including our Sun). For objects with an atmosphere, refraction plays an essential role to explain the drops of flux and the aureoles observed during these events ...
Sicardy, Bruno
doaj   +1 more source

Earth shaped by primordial H_2 atmospheres [PDF]

open access: yesNature, 2023
Thermodynamic modelling shows that Earth’s water, core density and overall oxidation state can be explained by the formation of Earth from planetary embryos with hydrogen-rich primary atmospheres and underlying magma oceans.
E. Young, A. Shahar, H. Schlichting
semanticscholar   +1 more source

Baroclinic and barotropic instabilities in planetary atmospheres: energetics, equilibration and adjustment

open access: yes, 2020
. Baroclinic and barotropic instabilities are well known as the mechanisms responsible for the production of the dominant energy-containing eddies in the atmospheres of Earth and several other planets, as well as Earth's oceans. Here we consider insights
P. Read   +7 more
semanticscholar   +1 more source

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