Preprints

There are 3624 Preprints listed.

A shallow approximation for ice streams sliding over strong beds

Katarzyna L P Warburton, Duncan Hewitt, Colin R. Meyer, et al.

Published: 2023-03-29
Subjects: Glaciology, Partial Differential Equations

Ice streams are regions of rapid ice sheet flow characterised by a high degree of sliding over a deforming bed. The Shallow Shelf Approximation (SSA) provides a convenient way to obtain closed-form approximations of the velocity and flux in a rapidly-sliding ice stream when the basal drag is much less than the driving stress. However, the validity of the SSA approximation breaks down when the [...]

Stationary surface waves and antidunes in dense pyroclastic density currents

Pete Rowley, Guido Giordano, Aurora Silleni, et al.

Published: 2023-03-28
Subjects: Earth Sciences, Sedimentology, Volcanology

Stationary antidunes are a product of critical flow in open channel systems, but with poor preservation potential. They are related to the existence of stationary surface waves in the overriding current, but their existence in the dense pyroclastic density current regime has been unrecognized to date. Experiments presented here demonstrate that surface waves in simulated dense pyroclastic density [...]

Bayesian estimation of nonlinear centroid moment tensors using multiple seismic data sets

Mahdi Hamidbeygi, Hannes Vasyura-Bathke, Jan Dettmer, et al.

Published: 2023-03-28
Subjects: Earth Sciences, Geophysics and Seismology

Centroid moment tensor (CMT) parameters of earthquakes are routinely estimated to gain information on structures and regional tectonics. However, for small earthquakes (M<4), it is still challenging to determine CMTs due to the lack of high-quality waveform data. In this study, we propose to improve solutions for small earthquakes by incorporating multiple seismic data types in Bayesian joint [...]

Linking the core heat content to Earth's accretion history

Vincent Clesi, Renaud Deguen

Published: 2023-03-26
Subjects: Earth Sciences, Geochemistry, Geophysics and Seismology, Planetary Geochemistry, Planetary Geophysics and Seismology

In this study we use a parameterized model of differentiation in a magma ocean setting, in which the magma ocean depth evolves during accretion, to predict the composition of the primordial core. We couple this chemical model to a thermal evolution model of the accreting metal to estimate the Earth's core heat content at the end of its formation. We find geochemically consistent models. All these [...]

N-S versus E-W extension in the Tibetan plateau: Are they driven by the same dynamics?

Giridas maiti, Arnab Roy, Nibir Mandal

Published: 2023-03-25
Subjects: Earth Sciences, Physical Sciences and Mathematics

The tectonic history of the Himalaya-Tibet Mountain Range records two important extensional tectonic events: 1) N-S extension in the Himalaya-Tibet transition zone, and 2) E-W extension in the southern and central Tibet, manifested in the form of east-west and north-south striking normal faults, respectively. The N-S extensional event (~22 Ma) started to commence earlier than the E-W extension [...]

Crop Yield Prediction based on Reanalysis and Crop Phenology Data in the Agroclimatic Zones

Serhan Yeşilköy, Ibrahim Demir

Published: 2023-03-25
Subjects: Agriculture, Civil and Environmental Engineering, Environmental Engineering

Crop yield and phenological stages are remarkably sensitive to not only environmental factors like atmospheric conditions and physical properties of soils but also agricultural activities. Accurate crop yield prediction plays a crucial role in food security and agricultural sustainability. There are several approaches that a wide range of researchers have tried to predict crop yield at different [...]

Viscosity of anhydrous and hydrous peridotite melts

Danilo Di Genova, Dmitry Bondar, Alessio Zandonà, et al.

Published: 2023-03-24
Subjects: Physical Sciences and Mathematics

The melt viscosity (η) of anhydrous and hydrous peridotite was investigated using a multipronged approach combining micropenetration viscometry, conventional DSC, flash DSC and Brillouin spectroscopy. Raman spectroscopy measurements were used to verify the absence of crystallization and/or degassing during high-temperature measurements of these extremely reactive glasses and melts, ensuring that [...]

“you just look at rocks, and have beards” Perceptions of geology from the UK: a qualitative analysis from an online survey.

Steven Leslie Rogers, Sam Giles, Natasha Joanne Dowey, et al.

Published: 2023-03-24
Subjects: Earth Sciences, Higher Education

In the last few decades, Geology courses, particularly in the Global North have seen a decline in student enrolment. Geologists have linked this downturn to a lack of exposure to the subject at school and college level. This work seeks to understand the public’s relationship with Geology and draws on over 5000 open-ended question responses to a survey disseminated in 2021. The survey asked both [...]

Continental configuration controls the base-state water vapor greenhouse effect: lessons from half-land, half-water planets

Marysa M. Lague, Gregory Ross Quetin, Sarah Ragen, et al.

Published: 2023-03-24
Subjects: Physical Sciences and Mathematics

The distribution of land and ocean on Earth’s surface shapes the global atmospheric circulation and climate by modulating fluxes of water and energy between the surface and the atmosphere. Here we rearranged land in an idealized climate model to explore the effect of eight simplified continental configurations on global climate, finding several counterintuitive results. The limited capacity of [...]

Sea ice concentration satellite retrievals influenced by surface changes due to warm air intrusions: A case study from the MOSAiC expedition.

Janna Elisabeth Rückert, Philip Rostosky, Marcus Huntemann, et al.

Published: 2023-03-24
Subjects: Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Warm air intrusions over Arctic sea ice can rapidly change the snow and ice surface conditions and can alter sea ice concentration (SIC) estimates derived from satellite- based microwave radiometry without altering the true SIC. Here we focus on two warm moist air intrusions that produced surface glazing during the Multidisciplinary drifting Observatory for the Study of Arctic Climate [...]

Can homogeneous nucleation resolve the inner core nucleation paradox?

Alfred Wilson, Dario Alfè, Andrew Walker, et al.

Published: 2023-03-24
Subjects: Condensed Matter Physics, Earth Sciences, Geophysics and Seismology, Mineral Physics, Planetary Geophysics and Seismology, Planetary Mineral Physics

Rice residue burning trajectories in Eastern India: Current realities, scenarios of change, and implications for air quality

Emily R Urban, Douglas Hamilton, DG Rossiter, et al.

Published: 2023-03-24
Subjects: Life Sciences

In 2019, the Government of India launched the National Clean Air Program (NCAP) to address the pervasive problem of poor air quality and the burdens it creates for public health, particularly in the 122 non-attainment cities that exceed national air quality standards. In much of Northern India, achieving and sustaining air quality improvements requires coordinated efforts to prevent agricultural [...]

Stochastic properties of coastal flooding events -- Part 2: Probabilistic analysis

Byungho Kang, Rusty Feagin, Thomas Huff, et al.

Published: 2023-03-23
Subjects: Civil and Environmental Engineering, Earth Sciences, Engineering

Low-intensity but high-frequency coastal flooding, also known as nuisance flooding, can negatively affect low-lying coastal communities with potentially large socioeconomic effects. This flooding also can greatly affect post-storm coastal dune recovery and reduce the long-term resilience of the back-barrier ecosystem. Recent analytical work has hypothesized that these frequent flooding events are [...]

Stochastic properties of coastal flooding events -- Part 1: CNN-based semantic segmentation for water detection

Byungho Kang, Rusty Feagin, Thomas Huff, et al.

Published: 2023-03-23
Subjects: Engineering

The frequency and intensity of coastal flooding is expected to accelerate in low-elevation coastal areas due to sea level rise. Coastal flooding due to wave runup affects coastal ecosystems and infrastructure, however it can be difficult to monitor in remote and vulnerable areas. Here we use a camera-based system to monitor wave runup as part of the after-storm recovery of an eroded beach on the [...]

Greenhouse gas intensity of geologic hydrogen produced from subsurface deposits

Adam R Brandt

Published: 2023-03-23
Subjects: Environmental Engineering, Environmental Indicators and Impact Assessment, Oil, Gas, and Energy

Geologic hydrogen (H2) deposits could be a source of climate friendly energy. In this work, we perform a prospective life cycle assessment of a generic geologic hydrogen production and processing system. While it is still too early in the development cycle to estimate precise life-cycle carbon intensities (CI) we can use fundamental engineering physics and chemistry to estimate CI. Our baseline [...]

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