Results 1 to 10 of about 60,537 (297)

Stability of the Martian Atmosphere [PDF]

Science, 1972
A detailed chemical dynamic model is presented for a moist martian atmosphere. Recombination of carbon dioxide is catalyzed by trace amounts of water. The abundances of carbon monoxide and molecular oxygen should vary in response to changes in atmospheric water and atmospheric mixing.
Thomas M. Donahue, Michael B. McElroy
openaire   +4 more sources

Meteoric Metal Chemistry in the Martian Atmosphere. [PDF]

J Geophys Res Planets, 2018
AbstractRecent measurements by the Imaging Ultraviolet Spectrograph (IUVS) instrument on NASA's Mars Atmosphere and Volatile EvolutioN mission show that a persistent layer of Mg+ ions occurs around 90 km in the Martian atmosphere but that neutral Mg atoms are not detectable.
Plane JMC, Carrillo-Sanchez JD, Mangan TP, Crismani MMJ, Schneider NM, Määttänen A.   +5 more
europepmc   +10 more sources

Influence of gravity waves on the climatology of high-altitude Martian carbon dioxide ice clouds [PDF]

Annales Geophysicae, 2018
Carbon dioxide (CO2) ice clouds have been routinely observed in the middle atmosphere of Mars. However, there are still uncertainties concerning physical mechanisms that control their altitude, geographical, and seasonal distributions.
E. Yiğit, A. S. Medvedev, P. Hartogh
doaj   +2 more sources

Impact sculpting of the early martian atmosphere. [PDF]

Sci Adv
Intense bombardment of solar system planets in the immediate aftermath of protoplanetary disk dissipation has played a key role in their atmospheric evolution. During this epoch, energetic collisions will have removed substantial masses of gas from rocky planet atmospheres.
Shorttle O, Saeidfirozeh H, Rimmer PB, Laitl V, Kubelík P, Petera L, Ferus M.   +6 more
europepmc   +6 more sources

A mesoscale model for the Martian atmosphere [PDF]

Journal of Geophysical Research: Planets, 2002
The Pennsylvania State University/National Center for Atmosphere Research Mesoscale Model Version 5 (MM5) has been converted for use on Mars. Modifications are based on schemes implemented in the Geophysical Fluid Dynamics Laboratory Mars General Circulation Model (GCM).
Toigo, Anthony D., Richardson, Mark I.
openaire   +6 more sources

A Thermal Plume Model for the Martian Convective Boundary Layer [PDF]

Journal of Geophysical Research: Planets. Volume 118, Issue 7, pages 1468-1487, July 2013, 2013
The Martian Planetary Boundary Layer [PBL] is a crucial component of the Martian climate system. Global Climate Models [GCMs] and Mesoscale Models [MMs] lack the resolution to predict PBL mixing which is therefore parameterized.
Colaïtis, Arnaud, Forget, François, Hourdin, Frédéric, Millour, Ehouarn, Rio, Catherine, Spiga, Aymeric   +5 more
core   +3 more sources

Observation of pressure variations in the Martian atmosphere [PDF]

Geophysical Research Letters, 2003
Pressure waves in the Martian atmosphere could so far be observed only in the presence of clouds. Thanks to the Mars Global Surveyor/Mars Orbiter Laser Altimeter (MGS/MOLA), a direct observation is now possible, with the method presented here. Many more events are thus potentially observable. We compare altimetry measurements from MGS/MOLA and spectral
Gendrin, Aline, Erard, Stéphane, Drossart, Pierre, Melchiorri, Riccardo   +3 more
openaire   +6 more sources

Of Martian atmospheres, oceans, and fossils

Icarus, 1990
Abstract Based on the absence of extensive cratering on the northern Martian plains, it is suggested that these plains were the sites of ancient oceans, 2 to 3.5 Gyr ago, with a calculatable water depth of (≥) 0.7 km. Also it appears possible to interpret the crater density counts for Chryse and the highlands as implying that Mars had a fairly dense ...
H. L. Helfer
openaire   +3 more sources

Stable carbon isotope evolution of formaldehyde on early Mars [PDF]

Scientific Reports
Organic matter in the Martian sediments may provide a key to understanding the prebiotic chemistry and habitability of early Mars. The Curiosity rover has measured highly variable and 13C-depleted carbon isotopic values in early Martian organic matter ...
Shungo Koyama, Tatsuya Yoshida, Yoshihiro Furukawa, Naoki Terada, Yuichiro Ueno, Yuki Nakamura, Arihiro Kamada, Takeshi Kuroda, Ann Carine Vandaele   +8 more
doaj   +2 more sources

A hybrid origin for the Martian atmosphere [PDF]

arXiv
The Martian isotopic record displays a dichotomy in volatile compositions. Interior volatiles from the mantle record a chondritic heritage (e.g., H, N, Kr, Xe) whereas the atmospheric reservoir of Kr and Xe - which do not currently experience escape - record heritage from a solar-like source.
Pahlevan, Kaveh, Schaefer, Laura, Porcelli, Don   +2 more
arxiv   +3 more sources