Preprints
Filtering by Subject: Physical Sciences and Mathematics
3D diffusion of water in melt inclusion-bearing olivine phenocrysts
Published: 2023-12-06
Subjects: Physical Sciences and Mathematics
Olivine-hosted melt inclusions are an important archive of pre-eruptive processes such as magma storage, mixing and subsequent ascent through the crust. However, this record can be modified by post entrapment diffusion of H+ through the olivine lattice. Existing studies often use spherical or 1D models to track melt inclusion dehydration that fail to account for complexities in geometry, [...]
Data-space cross-validation of global tomographic models to assess mantle structure underneath the Pacific Ocean
Published: 2023-12-05
Subjects: Physical Sciences and Mathematics
Seismic tomography is a principal method for studying deep mantle plume structure. Imaging Earth's wavespeed anomalies is conditioned by seismic wave sampling, and the uneven distribution of receiving stations worldwide leaves several candidate plumes beneath various hotspots across the globe poorly resolved. We regionally evaluate two full-waveform global tomography wavespeed models, GLAD-M25 [...]
Never train an LSTM on a single basin
Published: 2023-12-05
Subjects: Artificial Intelligence and Robotics, Computer Sciences, Earth Sciences, Hydrology, Physical Sciences and Mathematics
Machine learning (ML) has an increasing role in the hydrological sciences, and in particular, certain types of time series modeling strategies are popular for rainfall-runoff modeling. A large majority of studies that use this type of model do not follow best practices, and there is one mistake in particular that is very common: training deep learning models on small, homogeneous data sets (i.e., [...]
FluxFormer: Upscaled global carbon fluxes from eddy covariance data with multivariate timeseries Transformer
Published: 2023-12-05
Subjects: Earth Sciences, Physical Sciences and Mathematics
We provided a monthly global gross primary production (GPP) and ecosystem respiration (RECO) dataset from 1990 to 2019 at 0.25° × 0.25° spatial resolution named FluxFormer by utilizing the new plant function type dataset in combination with multivariate timeseries Transformer-based model. FluxFormer outperforms other satellite-derived upscaled products when comparing the correlation at site-level [...]
Multiple dikes make eruptions easy
Published: 2023-12-04
Subjects: Physical Sciences and Mathematics
Dikes supply magma to most volcanic eruptions. Understanding how propagating dikes may, or may not, reach the surface is thus one of the fundamental tasks for volcanology. Many, perhaps most, dike segments injected from magma sources do not reach the surface to feed volcanic eruptions. Instead, the dike segments become arrested (stop their propagation), commonly at or close to contacts between [...]
Towards an Integrated Texture Toolkit, 1: Unveiling the Complex Relationship Between Crystal Size, Shape, and Fabric in EBSD Data
Published: 2023-12-04
Subjects: Physical Sciences and Mathematics
Rock textures observed via thin section are skewed from their true 3D nature. This is due to a variety of cut effects—artifacts that are introduced due to the lower dimensional nature of the thin section relative to the rock. Typically, these methods invert crystal shape and crystal size, but with each process performed separately and in sequence. With the ongoing adoption of electron backscatter [...]
A study of extreme water waves using a hierarchy of models based on potential-flow theory
Published: 2023-12-02
Subjects: Applied Mathematics, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Partial Differential Equations, Physical Sciences and Mathematics
The formation of extreme waves arising from the interaction of three line-solitons with equal far-field amplitudes is examined through a hierarchy of water-wave models. The Kadomtsev-Petviashvili equation (KPE) is first used to prove analytically that its exact three-soliton solution has a ninefold maximum amplification that is achieved in the absence of spatial divergence. Reproducing this [...]
Downslope weakening of soil revealed by a rapid robotic rheometer
Published: 2023-11-30
Subjects: Physical Sciences and Mathematics
Moving down a hillslope from ridge to valley, soil develops and becomes increasingly weathered. Downslope variation in clay content, organic matter, and porosity should produce concomitant changes in soil strength that influence slope stability and erosion. This has yet to be demonstrated, however, because in-situ measurements of soil rheology are challenging and rare. Here we employ a robotic [...]
Potential Volcanic Origin of the 2023 short-period Tsunami in the Izu Islands, Japan
Published: 2023-11-29
Subjects: Physical Sciences and Mathematics
On October 8, 2023, at 21:40 UTC (6:40 on October 9 local time), a tsunami warning was declared for the Izu Islands and southwest Japan. This tsunami was initially considered to be associated with the M4.9 earthquake at 20:25 UTC (5:25 JST). However, we know events of this magnitude are far too small to generate observed tsunamis from coseismic deformation alone. In this study, we analyzed the [...]
A Review of Measurement for Quantification of Carbon Dioxide Removal by Enhanced Weathering in Soil
Published: 2023-11-28
Subjects: Physical Sciences and Mathematics
All pathways which limit global temperature rise to <2oC above pre-industrial temperatures now require carbon dioxide removal (CDR) in addition to rapid greenhouse gas emissions reductions. Novel and durable CDR strategies need to rapidly scale over the next few decades in order to reach Paris Agreement Targets. Terrestrial enhanced weathering (EW) involves the acceleration of natural weathering [...]
ICESat-2 and ocean particulates: Building a roadmap for calculating Kd from space-based lidar photon profiles
Published: 2023-11-28
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 [...]
Plagioclase-saturated melt hygrothermobarometry and plagioclase-melt equilibria using machine learning
Published: 2023-11-23
Subjects: Earth Sciences, Geochemistry, Geology, Physical Sciences and Mathematics, Volcanology
Compositions of plagioclase-melt pairs are commonly used to constrain temperatures (T), dissolved water contents (H2O) and pressures (P) of pre-eruptive magma storage and transport. However, previous plagioclase-based thermometers, hygrometers, and barometers can have significant errors, leading to imprecise reconstructions of conditions during plagioclase growth. Here, we explore whether we can [...]
Towards parameterizing eddy-mediated transport of Warm Deep Water across the Weddell Sea continental slope
Published: 2023-11-23
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
The transport of Warm Deep Water (WDW) onto the Weddell Sea continental shelf is associated with a heat flux and strongly contributes to the melting of Antarctic ice shelves. The small radius of deformation at high latitudes makes it difficult to accurately represent the eddy-driven component of onshore WDW transport in coarse-resolution ocean models so that a parameterization becomes necessary. [...]
Diurnal Warm Layers in the ocean: Energetics, non-dimensional scaling, and parameterization
Published: 2023-11-22
Subjects: Physical Sciences and Mathematics
Diurnal Warm Layers (DWLs) form near the surface of the ocean on days with strong solar radiation, weak to moderate winds, and small surface-wave effects. Here, we use idealized second-moment turbulence modelling, validated with Large Eddy Simulations (LES), to study the properties, dynamics and energetics of DWLs across the entire physically relevant parameter space. Both types of models include [...]
Luminescence Profiling and Flood Sediments from an Arctic Lake Over the Last Millenia
Published: 2023-11-22
Subjects: Physical Sciences and Mathematics
A small Arctic floodplain-lake (Tendammen, Colesdalen valley) in Svalbard revealed a laminated sediment sequence with numerous 14C AMS age-depth reversals in its 800 year history. In order to test the hypothesis that the anomalous dates result from catchment erosion and the deposition of reworked sediment and macrofossils, we applied luminescence profiling and flood-sensitive biological proxies. [...]