Results 1 to 10 of about 727,242 (300)

Meteoric Metal Chemistry in the Martian Atmosphere. [PDF]

J Geophys Res Planets, 2018
Recent 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 ...
Plane JMC, Carrillo-Sanchez JD, Mangan TP, Crismani MMJ, Schneider NM, Määttänen A.   +5 more
europepmc   +8 more sources

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

The 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, Shohei Aoki, Yuichiro Ueno, Naoki Terada, Yuki Nakamura, Kimie Shiobara, Nao Yoshida, Hiromu Nakagawa, Shotaro Sakai, Shungo Koyama   +9 more
doaj   +2 more sources

Dust tides and rapid meridional motions in the Martian atmosphere during major dust storms. [PDF]

Nat Commun, 2020
The atmosphere of Mars is strongly affected by the spatial and temporal variability of airborne dust. However, global dust variability within a sol (Martian day) is still poorly understood.
Wu Z, Li T, Zhang X, Li J, Cui J.
europepmc   +2 more sources

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.
Michael B. McElroy, T. M. Donahue
openalex   +4 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   +7 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).
A. D. Toigo, M. I. Richardson
openalex   +6 more sources

The value of returning a sample of the Martian atmosphere. [PDF]

Proc Natl Acad Sci U S A
The elemental and isotopic abundances of major species in the Martian atmosphere have been determined, but analyses often lack sufficient precision, and those of minor and trace species are frequently not well known. Many important questions about the evolution and current state of Mars require the kind of knowledge that can be gained from analysis of ...
Swindle TD, Pack A, Schwenzer SP, Young ED.   +3 more
europepmc   +4 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
A. Gendrin, S. Érard, P. Drossart, Riccardo Melchiorri   +3 more
openalex   +5 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
openalex   +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