There are 2197 Preprints listed.

Contributions to Polar Amplification in CMIP5 and CMIP6 Models

Lily Caroline Hahn, Kyle C. Armour, Mark D Zelinka, Cecilia M. Bitz, Aaron Donohoe

Published: 2021-05-18
Subjects: Physical Sciences and Mathematics

As a step towards understanding the fundamental drivers of polar climate change, we evaluate contributions to polar warming and its seasonal and hemispheric asymmetries in Coupled Model Intercomparison Project phase 6 (CMIP6) as compared with CMIP5. CMIP6 models broadly capture the observed pattern of surface- and winter-dominated Arctic warming that has outpaced both tropical and Antarctic [...]

Chromium evidence for protracted oxygenation during the Paleoproterozoic

Kaarel Mänd, Noah J. Planavsky, Susannah M Porter, Changle Wang, Timmu Kreitsmann, Kärt Paiste, Päärn Paiste, Alexander E. Romashkin, Yulia E. Deines, Kalle Kirsimäe, Aivo Lepland, Kurt O. Konhauser, Leslie J. Robbins

Published: 2021-05-18
Subjects: Earth Sciences, Geochemistry, Paleobiology

It has commonly been proposed that the development of complex life—e.g., aerobic eukaryotes—coincided with atmospheric oxygenation. To test this hypothesis, we measured chromium-based oxygen proxies in a >2400-m core from the Onega Basin (NW-Russia), deposited ~2.1–2.0 billion years ago—closely preceding the first eukaryote fossils. Fractionated chromium isotopes are documented throughout the [...]

Thermal Modelling Of Post-Fire Permafrost Change Under A Warming Coastal Subarctic Climate, Eastern Canada

Yifeng Wang, Antoni Lewkowicz, Jean Holloway, Robert Way

Published: 2021-05-17
Subjects: Earth Sciences, Physical Sciences and Mathematics

Forest fires are known to have lasting thermal impacts on permafrost, but there are no previous studies of such effects along the eastern Canadian coastline. One-dimensional thermal modelling was used to examine the ground thermal regime at a coastal forest fire site in the discontinuous permafrost zone near Nain (56.5°N), Nunatsiavut, eastern Canada. Simulations were undertaken for both the [...]

An initial assessment of community representation and diversity within UK geophysics

Christopher J Davies, Stephen Hicks, Lauren Cox, Sheila Peacock

Published: 2021-05-17
Subjects: Education

The British Geophysical Association (BGA) is a Joint Association of the Geological Society of London (GSL) and the Royal Astronomical Society (RAS) that aims to promote the subject of geophysics, and to strengthen the relationship between geology and geophysics in the UK. As such, engagement with all members of the geophysics community is integral to our purpose, and we recognise that the Earth [...]

Determination of the spatial distribution of wetting in the pore networks of rocks

Gaetano Garfi, Cédric M. John, Maja Rücker, Qingyang Lin, Catherine Spurin, Steffen Berg, Sam Krevor

Published: 2021-05-17
Subjects: Engineering, Physical Sciences and Mathematics

The macroscopic movement of subsurface fluids involved in CO2 storage, groundwater, and petroleum engineering applications is controlled by interfacial forces in the pores of rocks, micrometre to millimetre in length scale. Recent advances in physics based models of these systems has arisen from approaches simulating flow through a digital representation of the complex pore structure. However, [...]

Nature and timing of anatectic event of the Hida Belt (Japan): Constraints from titanite geochemistry and U-Pb age of clinopyroxene-bearing leucogranite

Hironobu Harada, Tatsuki Tsujimori, Yoshiaki Kon, Shogo Aoki, Kazumasa Aoki

Published: 2021-05-17
Subjects: Geochemistry, Geology

The Hida Belt, central Japan, is a continental fragment, which was once a part of the crustal basement of the East Asian continental margin. It consists mainly of Permo-Triassic granite-gneiss complexes with both syn-to-late-metamorphic migmatite or granite bodies. Clinopyroxene-bearing leucogranite, locally called as 'Inishi'-type migmatite, occurs characteristically in the migmatite zone [...]

Evaluating the benefits of alternative leak detection programs

Martin Lavoie, David Risk, Elizabeth O'Connell, Emmaline Atherton, Jan Gorski, Jack Johnson

Published: 2021-05-15
Subjects: Oil, Gas, and Energy

New technologies have the potential to reduce the cost of leak detection and repair (LDAR) for producers of all sizes through smart LDAR program design, the right combination of technologies, and by collaboration between producers within the same geographic area. This potential was examined in an extensive study by conducting multiple simulations using the Arolytics AROfemp model to evaluate the [...]

AMS and rock magnetism in the Caviahue-Copahue Volcanic Complex (Southern Andes): emission center, flow dynamics, and implications to the emplacement of non-welded PDCs

Mauricio Barcelos Haag, Carlos Augusto Sommer, Jairo Fransciso Savian, Alberto Tomás Caselli, Thiago Ribas Moncinhatto, Gelvam André Hartmann, Michael Ort, Wilbor Poletti, Ricardo Ivan Ferreira da Trindade

Published: 2021-05-14
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Physical Sciences and Mathematics, Volcanology

Pyroclastic deposits can cover significant areas and register major geological events. Despite their importance, understanding depositional dynamics of pyroclastic density currents (PDCs) and linking explosive deposits to their emission centers is still a challenge, especially in the case of non-welded, massive ignimbrites. Located in the Southern Andes, the Caviahue Copahue Volcanic Complex [...]

The carbon cycle of southeast Australia during 2019-2020: Drought, fires and subsequent recovery

Brendan Byrne, Junjie Liu, Meemong Lee, Yi Yin, Kevin W. Bowman, Kazuyuki Miyazaki, Alexander J. Norton, Joanna Joiner, David F. Pollard, David W. T. Griffith, Voltaire A. Velazco, Nicholas M. Deutscher, Nicholas B. Jones, Clare Paton-Walsh

Published: 2021-05-13
Subjects: Atmospheric Sciences, Environmental Monitoring, Environmental Sciences, Forest Sciences, Physical Sciences and Mathematics

2019 was the hottest and driest year on record for southeast Australia leading to bushfires of unprecedented extent between November 2019 and January 2020. In this study, we utilize space-based measurements of trace gases (TROPOspheric Monitoring Instrument XCO, Orbiting Carbon Observatory 2 XCO2) and up-scaled GPP (FluxSat GPP) to quantify the carbon cycle anomalies resulting from drought and [...]

A damage model for the frictional shear failure of brittle materials in compression

Simon Philip Gill

Published: 2021-05-13
Subjects: Applied Mathematics, Computational Engineering, Earth Sciences, Engineering, Geology, Materials Science and Engineering, Physical Sciences and Mathematics

Damage models have been successfully employed for many decades in the modelling of tensile failure, where the crack surfaces separate as a crack grows. The advantage of this approach is that crack trajectories can be computed simply and efficiently on a fixed finite element mesh without explicit tracking. The development of damage models for shear failure in compression, where the crack faces [...]

Field evidence for disequilibrium dynamics in preserved fluvial cross-strata: A record of discharge variability or morphodynamic hierarchy?

Sinead Lyster, Alexander C Whittaker, Elizabeth A Hajek, Vamsi Ganti

Published: 2021-05-13
Subjects: Earth Sciences

Bedforms preserved in the rock record can provide detailed information on the morphologies and hydrodynamics of ancient fluvial systems on Earth and other planets. Existing process–product relations for bedform preservation assume that fluvial cross strata reflect conditions under which bedforms were equilibrated with the prevailing flow, i.e., steady-state conditions. However, recent theoretical [...]

Geochemical signatures of rare earth elements and yttrium in the vicinity of an ion-adsorption type deposit: roles of source sediment control

Haiyan Liu, Huaming Guo, Olivier Pourret, Maohan Liu, Zhen Wang, Weimin Zhang, Zebing Li, Bai Gao, Zhanxue Sun, Pierre Laine

Published: 2021-05-13
Subjects: Biogeochemistry, Geochemistry, Geology, Hydrology

The elevated concentrations of rare earth elements (REE) and yttrium (REE+Y) in acid mine drainage (AMD) constitute an opportunity for REE+Y recovery. However, the source and control of REE+Y signatures in AMD remains uncertain. Water, rock, sediment and sludge samples were collected from an ion-adsorption rare earth mining area to investigate REE+Y concentration and fractionation patterns in [...]

Distributed Acoustic Sensing for Near Surface Imaging from Submarine Telecommunication Cable: Case Study in the Trondheim Fjord

Kittinat Taweesintananon, Martin Landrø, Jan Kristoffer Brenne, Aksel Haukanes

Published: 2021-05-13
Subjects: Geophysics and Seismology, Geotechnical Engineering, Signal Processing, Systems and Communications

Distributed acoustic sensing (DAS) transforms submarine telecommunication cables into densely sampled seismic receivers. To demonstrate DAS applications for seismic imaging, we use an optical cable on the seafloor in the Trondheim Fjord, Norway, to record seismic data generated by a controlled seismic source. The data are simultaneously recorded by a towed hydrophone array and the fiber optic [...]

Coupling between shallow and deep fault populations governs along-strike variations in fault reactivation and structural inheritance, the Laminaria High, NW Shelf of Australia

Thomas Brian Phillips, Ken McCaffrey, Luke Magarinos

Published: 2021-05-13
Subjects: Earth Sciences, Geology, Physical Sciences and Mathematics, Tectonics and Structure

When extension events are greatly separated in time, older faults may be buried and stratigraphically separated from newly developing faults at shallower depths. During rifting, the buried structures may reactivate and propagate upwards to be expressed within the shallow system. The degree of linkage between structural levels determines the influence that the deeper structures can exert over the [...]


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