Filtering by Subject: Planetary Sciences

Intermittent saltation drives Mars-like aeolian activity on Titan

Francesco Comola, Jasper F Kok, Juan M Lora, Kaylie Cohanim, Xinting Yu, Chao He, Patricia McGuiggan, Sarah M Hörst, Francis Turney

Published: 2021-03-25
Subjects: Physical Sciences and Mathematics, Planetary Sciences

Titan, the largest moon of Saturn, is characterized by gigantic linear dunes and an active dust cycle. Much like on Earth, these and other aeolian processes are caused by the wind-driven mobilization of surface grains, known as saltation. To date, very little is known about the conditions that allow for the occurrence of saltation on Titan. In fact, Titan saltation may be fundamentally different [...]

Spatial spectrum of temperature fluctuations in buoyancy driven chaotic and turbulent atmosphere

Alexander Bershadskii

Published: 2021-03-25
Subjects: Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics, Planetary Sciences

It is shown, using results of direct numerical simulations, laboratory experiments, measurements in the atmospheric boundary layer, in troposphere, in stratosphere, and the satellite infrared radiances data that in many cases the temperature fluctuations in buoyancy driven chaotic and turbulent atmosphere can be well described by the distributed chaos approach based on the Bolgiano-Obukhov [...]

Lithologic Controls on Silicate Weathering Regimes of Temperate Planets

Kaustubh Hakim, Dan J. Bower, Meng Tian, Russell Deitrick, Pierre Auclair-Desrotour, Daniel Kitzmann, Caroline Dorn, Klaus Mezger, Kevin Heng

Published: 2021-03-12
Subjects: Astrophysics and Astronomy, Earth Sciences, Geochemistry, Planetary Geochemistry, Planetary Sciences

Weathering of silicate rocks at a planetary surface can draw down CO2 from the atmosphere for eventual burial and long-term storage in the planetary interior. This process is thought to provide essential negative feedback to the carbonate-silicate cycle (carbon cycle) to maintain clement climates on Earth and potentially similar temperate exoplanets. We implement thermodynamics to determine [...]

Mars Dichotomy: Prospects for human life on Mars

María Angélica Leal Leal, David Tovar, Jimena Sánchez Nieves, María Trinidad Ceferino Ramírez, Ingela Carolina Ríos Jiménez, Marisol Leal Leal, Rosa Alejandra Reyes Quiñonez, Iván Manjarrés Cadena, Aura Elizabeth Quiñonez Toro, Francisco José Reyes Torres, María Camila Orozco Martínez, Yih Wen Fung, Carlos Humberto Barreto, Luz Marina Melgarejo Muñoz, Sergio Esteban Matoma Rivas, Daniel Guillermo Perico Sánchez, Andrés Tovar, Mónica Alexandra Antolínez Rodríguez, Julián Alexander Arias Calvo, Estefani Martínez Tapias, Laura Natalia Ballesteros Santana, Marha Alejandra Franco Prada, Adrián Arturo Rodríguez Rubiano, Santiago Páez Avendaño, Santiago Monsalve Silva, Sebastian Castaño Ramírez, Juan Diego Parra Mosquera, Andrés Castaño, Aixa Marín Orozco, Alejandro Niño García, Carlos Geovanny García Castro, Juan Manuel Jiménez Vergara, Camilo Andrés Escobar Tarazona, Daniel Felipe Ramírez Díaz, Lorena Bastidas Gómez, Iván Alexis Nocua Benitez, Oscar Fernando Barriga Romero, Natalia Barreto Escobar, Camila Andrea Gahona, Juan Sebastián Rodríguez Camero, Daniel Ruyardi Restrepo Barbosa, Yulied Porras Ramírez, Andrés Felipe Parada Valle, Esmeralda Laverde, Melissa Ocampo Avendaño, María Valentina Vega Caro, Liliana Figueroa del Castillo

Published: 2021-03-04
Subjects: Biology, Environmental Microbiology and Microbial Ecology Life Sciences, Medical Sciences, Other Astrophysics and Astronomy, Other Food Science, Planetary Geology, Planetary Sciences

Within the framework of the Mars City State Contest 2020 of The Mars Society, from Colombia, with an interdisciplinary and academic perspective, it was sought to give a perspective of solutions and answers to the challenges of possible human life on Mars. Thus, the document initially addresses a forward-looking prologue, an introduction to the concept of the proposed state, taking as a starting [...]

No cryosphere-confined aquifer below InSight on Mars

Michael Manga, Vashan Wright

Published: 2021-02-24
Subjects: Planetary Geophysics and Seismology, Planetary Hydrology, Planetary Sciences

The seismometer deployed by the InSight lander measured the seismic velocity of the Martian crust. We use a rock physics model to interpret those velocities and constrain hydrogeological properties. The seismic velocity of the upper ~10 km is too low to be ice-saturated. Hence there is no cryosphere that confines deeper aquifers. An increase in seismic velocity at depths of ~10 km could be [...]

Determination of vulnerability areas from the simulated deposition of atmospheric pollutants using LOTOS-EUROS chemical transport model in North-West South-America

Andres Yarce Botero, Santiago Lopez-Restrepo, Arjo Segers, O. Lucia Quintero, Arnold W. Heemink, Nicolas Pinel

Published: 2021-01-06
Subjects: Applied Mathematics, Bioresource and Agricultural Engineering, Civil and Environmental Engineering, Computer Sciences, Engineering, Physical Sciences and Mathematics, Planetary Sciences

This work presents the implementation of the LOTOS-EUROS regional atmospheric Chemical Transport Model (CTM) on Northwestern South America. The impact of land use and orography update in the model was analyzed to identify potential vulnerable natural areas by quantifying atmospheric deposition pollutants. CTMs allow simulating the physical dynamics of trace gasses and aerosols, including [...]

The precession constant and its long-term variation

Siavash Ghelichkhan, Jocelyn Fuentes, Mark Hoggard, Fred Richards, Jerry X Mitrovica

Published: 2020-12-08
Subjects: Astrophysics and Astronomy, Earth Sciences, Physical Sciences and Mathematics, Planetary Sciences

The dynamical flattening of the Earth, H, related to the precession constant, is a fundamental astro-geodetic parameter that appears in studies of the Earth's rotation and orbital evolution. We present numerical predictions and observations of the variation in H over time scales ranging from tens of millions of years to decades. The geophysical processes controlling this variation include [...]

VESIcal Part I: An open-source thermodynamic model engine for mixed volatile (H2O-CO2) solubility in silicate melts

Kayla Iacovino, Simon Matthews, Penny E Wieser, Gordon Moore, Florence Bégué

Published: 2020-12-08
Subjects: Earth Sciences, Geochemistry, Geology, Physical Sciences and Mathematics, Planetary Geochemistry, Planetary Geology, Planetary Sciences, Volcanology

Thermodynamics has been fundamental to the interpretation of geologic data and modeling of geologic systems for decades. However, more recent advancements in computational capabilities and a marked increase in researchers’ accessibility to computing tools has outpaced the functionality and extensibility of currently available modeling tools. Here we present VESIcal (Volatile Equilibria and [...]

Evaluating participatory modelling methods for co-creating pathways to sustainability

Enayat A. Moallemi, Fjalar J. de Haan, Michalis Hadjikakou, Sina Khatami, Shirin Malekpour, Alex Smajgl, Mark Stafford Smith, Alexey Voinov, Reihaneh Bandari, Prahlad Lamichhane, Kelly K. Miller, Emily Nicholson, Wikke Novalia, Euan G. Ritchie, Angela M. Rojas, M. Abdullah Shaikh, Katrina Szetey, Brett A. Bryan

Published: 2020-11-03
Subjects: Environmental Studies, Planetary Sciences, Systems Engineering

The achievement of global sustainability agendas, such as the Sustainable Development Goals, relies on transformational change across society, economy, and environment that are co-created in a transdisciplinary exercise by all stakeholders. Within this context, environmental and societal change is increasingly understood and represented via participatory modelling for genuine engagement with [...]

Fernandes and Roberts (2020) - preprint

Victoria Milanez Fernandes, Gareth Roberts

Published: 2020-08-16
Subjects: Earth Sciences, Environmental Sciences, Geology, Geomorphology, Paleobiology, Physical Sciences and Mathematics, Planetary Sciences, Tectonics and Structure

There are many geoscience problems for which constraining histories of uplift or subsidence of Earth’s surface is of direct or indirect importance, for example reconstructing tectonics, mantle convection, geomorphology, sedimentary and chemical flux, biodiversity, glacio-eustasy and climate change. The least equivocal constraints on timing and amplitude of vertical motions on geological [...]

Estimating survival probability using the terrestrial extinction history for the search for extraterrestrial life

Kohji Tsumura

Published: 2020-07-21
Subjects: Astrophysics and Astronomy, Earth Sciences, Physical Sciences and Mathematics, Planetary Sciences

Several exoplanets have been discovered to date, and the next step is the search for extraterrestrial life. However, it is difficult to estimate the number of life-bearing exoplanets because our only template is based on life on Earth. In this paper, a new approach is introduced to estimate the probability that life on Earth has survived from birth to the present based on its terrestrial [...]

Habitability of the early Earth: Liquid water under a faint young Sun facilitated by strong tidal heating due to a nearby Moon

René Heller, Jan-Peter Duda, Max Winkler, Joachim Reitner, Laurent Gizon

Published: 2020-07-10
Subjects: Astrophysics and Astronomy, Earth Sciences, Other Astrophysics and Astronomy, Other Earth Sciences, Physical Sciences and Mathematics, Planetary Sciences, The Sun and the Solar System

Geological evidence suggests liquid water near the Earths surface as early as 4.4 gigayears ago when the faint young Sun only radiated about 70 % of its modern power output. At this point, the Earth should have been a global snowball. An extreme atmospheric greenhouse effect, an initially more massive Sun, release of heat acquired during the accretion process of protoplanetary material, and [...]


Amin Shoari Nejad, Andrew Parnell, Alice Greene, Brian P Kelleher, Gerard McCarthy

Published: 2020-05-27
Subjects: Applied Statistics, Climate, Earth Sciences, Life Sciences, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Other Life Sciences, Physical Sciences and Mathematics, Planetary Sciences, Statistics and Probability

We analysed tide gauges at Dublin port and its environs over the period 1938-2018. With three different tide gauges in the vicinity of the main Dublin port gauge, we merged the data sets and validated them against each other. The recordings of all four tide gauges were found to be in good agreement between 2003-2015, though this was markedly less so from 2016 to the present. We estimate the sea [...]

Preservation of Organic Carbon in Dolomitized Cambrian Stromatolites and Implications for Microbial Biosignatures in Diagenetically Replaced Carbonate Rock

Ashley Elizabeth Murphy, Scott T. Wieman, Juliane Gross, Jennifer C. Stern, Andrew Steele, Mihaela Glamoclija

Published: 2020-05-25
Subjects: Biogeochemistry, Earth Sciences, Geochemistry, Geology, Physical Sciences and Mathematics, Planetary Geology, Planetary Sciences

Stromatolites have been a major focus in the search for ancient microbial biosignatures, however, the organic carbon biosignatures of dolomitized stromatolites have not yet been fully characterized and correlated with their dolomitizing conditions. The lack in detailed dolomitic stromatolite studies is likely because dolomitization rarely preserves microbial morphology, which hampers the [...]

Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars

Giovanni Baccolo, Barbara Delmonte, Paul B. Niles, Giannantonio Cibin, Elena Di Stefano, Dariush Hampai, Lindsay Keller, Valter Maggi, Augusto Marcelli, Joseph Michalski

Published: 2020-05-20
Subjects: Cosmochemistry, Earth Sciences, Geochemistry, Physical Sciences and Mathematics, Planetary Geochemistry, Planetary Glaciology, Planetary Sciences

Many interpretations have been proposed to explain the presence of jarosite within Martian surficial sediments, including the possibility that it precipitated within paleo-ice deposits owing to englacial weathering of dust. But until now a similar mechanism was not observed on Earth nor in other planetary settings. We report the first multi-analytical indication of jarosite formation within deep [...]


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