Preprints

Filtering by Subject: Planetary Sciences

Ultramafic Melt Viscosity: A Model

James Kelly Russell, Kai-Uwe Hess, Donald B. Dingwell

Published: 2024-05-13
Subjects: Earth Sciences, Physical Sciences and Mathematics, Planetary Sciences

A non-Arrhenian model for the Newtonian viscosity (η) of ultramafic melts is presented. The model predicts the viscosity of ultramafic melts as a function of temperature (T), pressure (P), H2O content and for a range of melt compositions (70 < Mg# < 100). The calibration consists of 63 viscosity measurements at ambient pressure for 20 individual melt compositions and 5 high-P measurements [...]

Geostratigraphic mapping of the intrusive Valentine Domes on the Moon

Javier Eduardo Suarez Valencia, Angelo Pio Rossi

Published: 2024-04-05
Subjects: Physical Sciences and Mathematics, Planetary Sciences

Lunar intrusive igneous rocks have not been widely studied in the past; this is related to their rare occurrence in the surface of the Moon, and the difficulty to identify them. Most of the known structures of this type were discovered with telescopic images and were identified as intrusive domes, which are characterized by their oval shape, low slope, and subtle effect in the topography. We [...]

Grüneisen parameter formalism in the study of the Earth's core formation: a sensitivity study

Vincent Clesi, Renaud Deguen

Published: 2024-03-20
Subjects: Condensed Matter Physics, Earth Sciences, Geochemistry, Geology, Mineral Physics, Other Earth Sciences, Planetary Geophysics and Seismology, Planetary Mineral Physics, Planetary Sciences

The Grüneisen parameter is an important parameter for the thermal state and evolution of the core, but its uncertainties and their implications are sometimes overlooked . Several formalisms using different parameters values have been used in different studies, making comparison between studies difficult. In this paper, we use previously published datasets to test the sensitivity of modeling the [...]

Development of metrics and indices for assessing national progress on climate risk, adaptation and dissonance based on observations, perceptions, and projections.

Fidel Serrano-Candela, Francisco Estrada, Graciela Raga, et al.

Published: 2024-01-18
Subjects: Planetary Sciences

The 28th Conference of the Parties (COP28) included the first Global Stocktake (GST) as part of the implementation of the Paris Agreement. GST is a five-yearly assessment of the state and advancements in global climate action and aims to help national governments keep track of their climate ambitions and implementation progress. This paper contributes to the discussion through the analysis of [...]

Diverse Carbonates in Exoplanet Oceans Promote the Carbon Cycle

Kaustubh Hakim, Meng Tian, Dan James Bower, et al.

Published: 2023-12-22
Subjects: Astrophysics and Astronomy, Planetary Geochemistry, Planetary Sciences

Carbonate precipitation in oceans is essential for the carbonate-silicate cycle (inorganic carbon cycle) to maintain temperate climates. By considering the thermodynamics of carbonate chemistry, we demonstrate that the ocean pH decreases by approximately 0.5 for a factor of 10 increase in the atmospheric carbon dioxide content. The upper and lower limits of ocean pH are within 1-4 of each other, [...]

MoonIndex, an Open-Source Tool to Generate Spectral Indexes for the Moon from M3 Data

Javier Eduardo Suarez Valencia, Angelo Pio Rossi, Francesca Zambon, et al.

Published: 2023-12-20
Subjects: Earth Sciences, Physical Sciences and Mathematics, Planetary Sciences

Spectral indexes are tools widely used to analyze the composition of the lunar surface. Many indexes have been formulated over the years, but there is no unified database for them. In this work we describe an Open-Source Python package called MoonIndex, that recreates thirty-nine indexes compiled from the literature and derived from several instruments, using data from the Moon Mineralogy Mapper [...]

ICESat-2 and ocean particulates: Building a roadmap for calculating Kd from space-based lidar photon profiles

Emily Eidam, Kelsey Bisson, Chao Wang, et al.

Published: 2023-11-27
Subjects: Earth Sciences, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics, Planetary Sciences

ICESat-2’s Advanced Topographic Laser Altimeter System (ATLAS) has emerged as useful tool for calculating attenuation signals in natural surface waters, thus improving our understanding of particulates from open-ocean plankton to nearshore suspended terrigenous sediments. While several studies have employed methods based on Beer’s Law to derive attenuation coefficients (including through a [...]

Complementary classifications of aeolian dunes based on morphology, dynamics, and fluid mechanics

Sylvain Courrech du Pont, David Michael Rubin, Clément Narteau, et al.

Published: 2023-10-03
Subjects: Earth Sciences, Fluid Dynamics, Geomorphology, Other Earth Sciences, Physical Sciences and Mathematics, Physics, Planetary Geomorphology, Planetary Sciences, Sedimentology

Dunes form where winds blow over a bed of mobile sediment grains – conditions that are common in our solar system. On Earth, dunes abound in arid continental interiors and along sandy coastlines. Dune fields have also been recognized on Venus, Mars, Saturn's moon Titan, and Pluto. In response to the different boundary conditions and other environmental forcings, dunes adopt a rich diversity [...]

Effects on Target Geology

Auriol S. P. Rae, Veronica J. Bray

Published: 2023-09-15
Subjects: Planetary Sciences

The process of impact crater formation can fundamentally change the nature of target materials, creating products that can be observed from planetary-scale geophysics all the way down to mineral microstructure. Impact-generated shock waves can vaporise, melt, and permanently deform the materials they pass through. Large quantities of the target are damaged and displaced, ejecting material outside [...]

A scoping review on climate change education

Veruska Muccione, Tracy Ewen, Saeid Ashraf Vaghefi

Published: 2023-07-28
Subjects: Planetary Sciences

Escalating climate impacts predicted in the past decades are now a reality almost everywhere on the planet, and the time-critical dimension of the climate crisis means that the coming years will be instrumental in securing a climate resilient future for generations to come. Education is central to promoting climate action, yet the role that climate change education plays in advancing climate [...]

Discovery of a new 12-km impact crater candidate at As Sail Al Kabeer, Saudi Arabia

Abdulrahman Toonsi

Published: 2023-07-11
Subjects: Earth Sciences, Geology, Physical Sciences and Mathematics, Planetary Geology, Planetary Sciences

The Arabian shield of Saudi Arabia likely has many impact craters due to the old age of its rocks, however many of them have not yet been discovered due to their resemblance to plutons. Using satellite imagery, a 12-km wide circular structure with a central peak was identified at As Sail Al Kabeer, 40 kilometers north of the city of Taif in western Saudi Arabia. Fieldwork has shown that this [...]

Making Planets on Earth: How Experimental Petrology Is Essential to Planetary Exploration

Kayla Iacovino, Nicole G Lunning, Gordon Moore, et al.

Published: 2023-04-26
Subjects: Planetary Geochemistry, Planetary Sciences

Our knowledge of the evolution of the solar system relies upon our ability to interpret a limited set of observations, including geochemical data from returned samples and meteorites, remotely sensed data from spacecraft and telescopes, and information measured in situ via landers and rovers. Our ability to obtain these data is constantly improving in quality and quantity, but the understanding [...]

Calling for a National Model Benchmarking Facility

Benjamin Lyle Ruddell, Martyn Clark, Jessica M Driscoll, et al.

Published: 2023-04-14
Subjects: Biology, Computer Sciences, Earth Sciences, Ecology and Evolutionary Biology, Environmental Sciences, Life Sciences, Oceanography and Atmospheric Sciences and Meteorology, Other Life Sciences, Physical and Environmental Geography, Physical Sciences and Mathematics, Planetary Sciences, Systems Biology

The modern world uses predictive computer models for many important purposes, including weather predictions, epidemic management, flood forecasting and warnings, and economic policymaking. We need to know how much we can trust the projections of these models, not only to achieve more accurate projections for systems, but also to undertake scientific learning about systems by incrementally testing [...]

Examining the power supplied to Earth's dynamo by magnesium precipitation and radiogenic heat production

Alfred Wilson, Monica Pozzo, Chris Davies, et al.

Published: 2023-04-05
Subjects: Earth Sciences, Geophysics and Seismology, Mineral Physics, Physical Sciences and Mathematics, Planetary Sciences

We examine magnesium and potassium solubility in liquid Fe mixtures, representative of Earth’s core composition, in equilibrium with liquid silicate mixtures representative of an early magma ocean. Our study is based on the calculation of the chemical potentials of MgO and K2O in both phases, using density functional theory. For MgO, we also study stability against precipitation of the solid [...]

Reconciling fast and slow cooling during planetary formation as recorded in the main group pallasites

Maeve Elizabeth Murphy Quinlan, Andrew Walker, Chris Davies

Published: 2023-03-31
Subjects: Cosmochemistry, Other Planetary Sciences, Physical Sciences and Mathematics, Planetary Geology, Planetary Sciences

Pallasite meteorites contain evidence for vastly different cooling timescales: rapid cooling at high temperatures (K/yrs) and slow cooling at lower temperatures (K/Myrs). Pallasite olivine also shows contrasting textures ranging from well-rounded to angular and fragmental, and some samples record chemical zoning. Previous pallasite formation models have required fortuitous changes to the parent [...]

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