There are 4248 Preprints listed.

Superplastic deformation inside the knife-sharp shear bands in mid-crustal granites

Anamitra Sikdar, Dripta Dutta, Santanu Misra

Published: 2023-10-10
Subjects: Education

We examined the microstructures of three ductile shear bands of granitic composition that deformed under mid-to-upper greenschist facies. These shear bands, from the Bundelkhand Craton, India, are 0.8-4.4 mm thick with 20-30 microns median grain sizes and share sharp contacts with the host granite. Comminution of the rheologically stronger feldspars increased permeability, promoted fluid influx, [...]

Approaching coherent turbulence and the roll-cell transition with Lagrangian coherent structures and objective fluxes

Nikolas Olson Aksamit, Marwan Katurji, Jiawei Zhang

Published: 2023-10-09
Subjects: Atmospheric Sciences

We present the first analysis of objective and material vortices in Large Eddy Simulations of atmospheric boundary layer turbulence. We extract rotating fluid features that maintain structural coherence over time for near-neutral, transitional, and convective boundary layers. In contrast to traditional analysis of coherent structures in turbulent boundary layers, we provide the first objective [...]

The influence of fluid inclusions, organics, and calcite fabric on trace element distributions in stalagmites

Heather M. Stoll, Oliver Kost

Published: 2023-10-09
Subjects: Earth Sciences, Physical Sciences and Mathematics

Growing stalagmites entrap water and organic molecules while incorporating trace elements in diverse crystallographic fabrics. However, the interrelationships between crystal defects, fluid inclusions, organic carbon incorporation, and trace element incorporation in stalagmites remain poorly constrained. Here we use for the first time Fourier Transformation Infrared Focal-Plane Array (FTIR-FPA) [...]

Site selection for desert wind and solar farms based on heterogeneous sand flux

Guoshuai Li, Lihai Tan, Bao Yang, et al.

Published: 2023-10-09
Subjects: Atmospheric Sciences, Environmental Indicators and Impact Assessment, Geomorphology, Risk Analysis

Site selection is a priority for building wind and solar farms in deserts, which has to consider the dune threats associated with sand flux, such as dust contamination and sand burial. Thus, understanding changes in sand flux can optimize the site selection for wind and solar farms in deserts. Here, we use the ERA5-Land hourly wind data with 0.1°×0.1° resolution to calculate the yearly sand flux [...]

Progression of the surge in the Negribreen Glacier System from two years of ICESat-2 measurements

Thomas Trantow, Ute C. Herzfeld

Published: 2023-10-08
Subjects: Applied Mathematics, Earth Sciences, Physical Sciences and Mathematics

The unique measurement capabilities of ICESat-2 allow high spatiotemporal resolution of complex ice-dynamic processes that occur during a surge. Detailed and precise mapping of height changes on surge glaciers has previously escaped observations from space due to limited resolution of space-borne altimeter data and the surface characteristics of glaciers during surge such as heavy crevassing. [...]

Coral geochemical response to uplift in the aftermath of the 2005 Nias-Simeulue earthquake

Sindia M. Sosdian, Michael Gagan, Danny H. Natawidjaja, et al.

Published: 2023-10-07
Subjects: Environmental Indicators and Impact Assessment, Geochemistry, Geomorphology, Natural Resources and Conservation, Tectonics and Structure

On 28 March 2005, the Indonesian islands of Nias and Simeulue experienced a powerful Mw 8.6 earthquake and widespread co-seismic uplift and subsidence. In areas of coastal uplift (up to ~2.8 m), fringing reef coral communities were killed by exposure, while deeper corals that survived were subjected to habitats with altered runoff, sediment and nutrient regimes. Here we present time-series [...]

The ‘hidden story’ in simulating reflected radiance by wind-roughened sea surface: Mobley’s 1999 paper on simulation of Rrs measurements via the above-surface approach

Zhongping Lee, Xiaodong Zhang

Published: 2023-10-07
Subjects: Physical Sciences and Mathematics

Remote sensing reflectance (Rrs, in sr-1) is defined as the ratio of water-leaving radiance (Lw) to downwelling irradiance just above the water surface (Es). To measure Rrs, the above-water approach (AWA) is a widely adopted scheme in the past decades. In addition to the measurement of Es, AWA also involves measurements of upwelling radiance above the surface (Lt) and downwelling sky radiance [...]

Integration of Well Log, 3D Static Modeling, and Seismic Data in Characterization of KUKO Field Offshore Niger Delta, Nigeria.

Richard Ayobami Alakuko, Moses Olanrewaju Falowo

Published: 2023-10-06
Subjects: Physical Sciences and Mathematics

The KUKO offshore field in Niger Delta exhibits complex structural deformation and faulting, impacting the exploration and development of reservoirs due to uncertain properties. This study employs an integrated approach combining 3D seismic, well logs, and reservoir modeling to characterize the field. The study is centered on establishing a template for future research, evaluating petrophysical [...]

Digitization of Weather Records of Seungjeongwon Ilgi: A Historical Weather Dynamics Dataset of the Korean Peninsula in 1623-1910

Kohei Ichikawa, Zeyu Lyu, Yongchao Cheng, et al.

Published: 2023-10-06
Subjects: Climate, Meteorology, Oceanography and Atmospheric Sciences and Meteorology

Historical weather records from Europe indicate that the Earth experienced substantial climate variability, which caused, for instance, the Little Ice Age and the global crisis in the period between the 14th and 19th centuries. However, it is still unclear how global this climate variability was because of the scarce meteorological data availability in other regions including East Asia, [...]

The importance of anisotropic viscosity in numerical models for olivine textures in shear and subduction deformations

Yijun Wang, Ágnes Király, Clinton C Conrad, et al.

Published: 2023-10-05
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Olivine lattice preferred orientation (LPO), or texture, forms in relation to deformation mechanisms such as dislocation creep and can be observed in the upper mantle as seismic anisotropy. Olivine is also mechanically anisotropic, meaning that it responds to stresses differently depending on the direction of the stress. Understanding the interplay between anisotropic viscosity (AV) and LPO, and [...]

Constrictional flow and strain partitioning during oblique deformation: insights from the Variscan Tanneron massif, SE France

Josselin Gremmel, Guillaume Duclaux, Michel Corsini, et al.

Published: 2023-10-05
Subjects: Physical Sciences and Mathematics

Monitoring surface deformation with spaceborne radar interferometry in landslide complexes: insights from the Brienz/Brinzauls slope instability, Swiss Alps

Andrea Manconi, Nina Jones, Simon Loew, et al.

Published: 2023-10-05
Subjects: Earth Sciences

We performed an extensive analysis of C-Band SAR datasets provided by the European Space Agency (ESA) satellites ERS-1/2, Envisat ASAR, and Sentinel-1 in the period 1992-2020 aiming at reconstructing the multi-decadal spatial and temporal evolution of the surface displacements at the Brienz/Brinzauls landslide complex, located in canton Graubünden (Switzerland). To this end, we analyzed about [...]

A shift in the Sr isotopic composition of the magmatic source triggering 2019 paroxysmal eruptions at Stromboli Volcano

Christian J. Renggli, Joachim Krause, Felix Genske, et al.

Published: 2023-10-05
Subjects: Earth Sciences, Geochemistry, Physical Sciences and Mathematics, Volcanology

The persistent volcanic activity of Stromboli Volcano, Aeolian Islands, Italy, is interrupted by paroxysmal eruptions on a decadal interval. In 2019, two strong paroxysms on July 3rd and August 28th, ended a more than a decade long period of regular strombolian activity. During normal strombolian activity the volcano erupts highly porphyritic scoria and lava (HP)20 with a shoshonitic basalt [...]

Two-dimensional ideal magnetohydrodynamic waves on a rotating sphere under a non-Malkus field: I. Continuous spectrum and its ray-theoretical interpretation

Ryosuke Nakashima, Shigeo Yoshida

Published: 2023-10-05
Subjects: Fluid Dynamics

Two-dimensional (2D) ideal incompressible magnetohydrodynamic (MHD) linear waves at the surface of a rotating sphere are studied as a model imitating the outermost Earth's core or the solar tachocline. This thin conducting layer is permeated by a toroidal magnetic field whose magnitude depends only on the latitude. The Malkus background field, which is proportional to the sine of the colatitude, [...]

Novel observations of East Asian Summer Monsoon evolution during Glacial Termination II from Lake Suigetsu, Japan

Charlie Rex, Richard Staff, Jaime Toney, et al.

Published: 2023-10-04
Subjects: Climate, Geochemistry

Glacial terminations offer a unique opportunity to examine how the East Asian Summer Monsoon (EASM) responds to rapid increases in global temperature and accompanying abrupt climatic reorganisation. Reconstructions from contrasting glacial terminations with differently evolving boundary conditions are of particular value to our understanding of deglacial EASM behaviours, e.g., Termination I (from [...]


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