Preprints
There are 7013 Preprints listed.
Stratigraphy as a low-pass filter: selective preservation of spatial variability on a Holocene carbonate platform
Published: 2026-05-20
Subjects: Physical Sciences and Mathematics
Walther’s law, a fundamental principle in geoscience, predicts that laterally adjacent depositional environments become preserved as a vertical succession of layers (facies). As an expression of uniformitarianism, this law underpins interpretations of Earth’s history, yet it has not been quantitatively tested. We test this law and examine its limitations by quantifying multidecadal changes in [...]
Legacy brewery phosphorus as a management constraint in the Mashapaug Watershed: unresolved reservoirs and pathways in an urban pond cascade
Published: 2026-05-20
Subjects: Physical Sciences and Mathematics
Spectacle and Mashapaug Ponds have been listed as impaired waters in Rhode Island since 2002, with 20 public-health advisories issued since 2011. Phosphorus is treated as the primary limiting nutrient for harmful algal blooms in the watershed, and Spectacle Pond is the largest direct phosphorus source to Mashapaug Pond and the lower pond cascade. In February 2026, the Rhode Island Department of [...]
Seasonality and Trends in Coastal Water Temperatures from NOAA Water Level Monitoring Stations along US Coasts
Published: 2026-05-20
Subjects: Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
Coastal regions are complex environments. They lie at the confluence of physical oceanic, atmospheric, and land-based processes, and continue to undergo significant change due to both natural and human-driven factors. Although it is well known that ocean sea surface temperatures (SSTs) have increased over the past several decades, extending these trends and patterns to coastal waters is [...]
Stochastic Inversion of geophysical data by sequential Bayesian updating under a non-stationary Gaussian process prior
Published: 2026-05-20
Subjects: Earth Sciences, Statistics and Probability
The acquisition of geophysical data is becoming increasingly important in the context of critical mineral exploration. Geophysical data and inversion product are essential to map many components of the critical mineral system by detecting geophysical anomalies that can be interpreted by expert geologists. However, the inversion of airborne geophysical data acquired along flightlines into [...]
Integrating machine learning with a process-based model for estimating global wetland methane emissions
Published: 2026-05-20
Subjects: Physical Sciences and Mathematics
Methane emissions from natural wetlands are a major contributor to the changing global climate. However, estimates of such emissions are uncertain and depend on the modeling approach used. Process-based modeling of wetland emissions incorporates scientific knowledge of the underlying biogeochemical process, but prediction accuracy is insufficient. Machine learning models have the potential to [...]
Geometrical Variations of the Skeletal Structures of Genus Pantanellium as Determined from Collected Specimens
Published: 2026-05-20
Subjects: Paleontology
Novel graph and string representations of the cortical shell structures of the genus Pantanellium, a Mesozoic radiolarian, are proposed. The representations are then used to compare the frame structures of fifty-nine specimens collected for the study. Among the fifty-nine fossil specimens, forty-seven different structures were found. It was also found that the frequency of the truncated [...]
Multi-Modal Unsupervised Change Detection of Urban Vegetation in Birmingham, UK: A Cross-Method Comparison under 2022 Drought Conditions
Published: 2026-05-20
Subjects: Engineering
As the climate changes, cities are increasingly exposed to extreme weather events such as droughts, further amplified by the urban heat island effect. Urban vegetation, a key Nature-based Solution for cooling and climate resilience, is vulnerable to water stress. Therefore, it is increasingly important to understand how urban vegetation responds during drought years, particularly where [...]
Lumped Thermal Impedance Modeling of Anthropogenic Global Warming of the Troposphere
Published: 2026-05-18
Subjects: Climate, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
Anthropogenic global warming has reached a level so high that it is now possible to an- alyze its dynamics and spatial variation. Spatially varying Surface Air Temperature (SAT) anomalies [1] can be well described by exponential functions with increase rates that range from 2.1 to 3.7% per year, depending on the region. The Northern Hemisphere has warmed significantly more than the Southern [...]
GEDIMetrics: a QGIS plugin for accessing and integrating multi-product GEDI spaceborne LiDAR data
Published: 2026-05-18
Subjects: Databases and Information Systems, Environmental Monitoring, Forest Management, Geographic Information Sciences, Natural Resources and Conservation, Other Forestry and Forest Sciences, Remote Sensing, Spatial Science
NASA's Global Ecosystem Dynamics Investigation (GEDI) provides near-global, high-resolution 3D LiDAR observations of forest vertical structure. However, GEDI products are distributed as independent HDF5 files organised by beam, requiring ad-hoc workflows for data discovery, quality filtering, spatial subsetting, and footprint-level alignment across products. Existing tools either target a single [...]
Learning Seismic Wavefield Structure from Regional Arrays with Self-Supervised Deep Learning
Published: 2026-05-18
Subjects: Physical Sciences and Mathematics
Seismic wavefields recorded across regional arrays exhibit spatial structure governed by propagation physics, including phase alignment, apparent slowness, and source directionality. These properties underpin array processing, yet in sparsely sampled arrays the wavefield is only partially observed, making it difficult to determine how information is distributed across sensors. Particularly, it [...]
Coupled THM Processes Drive Spatiotemporal Slip Evolution in Fracture Networks during Geothermal Heat Production
Published: 2026-05-18
Subjects: Engineering
Understanding induced fracture slip in geothermal reservoirs requires clarifying the relative roles of rapid pore pressure propagation and slower cooling-related stress redistribution. We investigate this problem using coupled thermo-hydro-mechanical simulations with explicitly represented discrete fracture networks embedded in a poroelastic rock matrix. The study considers three fracture density [...]
Surrogate-Assisted Bayesian Inference of Fracture Network Parameters from Elastic Waves: A Sensitivity-Guided Approach
Published: 2026-05-18
Subjects: Engineering
We develop a sensitivity-guided, surrogate-assisted Bayesian framework to infer fracture network parameters from elastic waves. Synthetic fracture networks characterized by power-law length exponent \(a\), fracture density \(d\), and percolation parameter \(p\) are constructed. Elastic wave propagation through these fracture networks is then simulated across a range of dimensionless specific [...]
Polygonal peatlands and treed plateau bog in Northwest Hudson Bay Lowlands, Canada: Holocene development and permafrost dynamics
Published: 2026-05-17
Subjects: Life Sciences
Since the retreat of the Laurentide Ice Sheet, peatland development in the Hudson Bay Lowlands (HBL) has been mainly influenced by postglacial isostatic rebound and climate. We studied the timing of permafrost aggradation and the successional trajectories of low Arctic and subarctic polygonal peatlands and a boreal plateau bog in Wapusk National Park (WNP), in northwestern HBL. We also explored [...]
Green Hydrogen: The Future Prospect for Nepal's Energy Sector
Published: 2026-05-17
Subjects: Engineering
Nepal possesses an immense technically and economically feasible renewable energy potential of 45,000 MW, yet its current energy consumption remains heavily dominated by traditional sources and imported carbon-based fuels, driving a massive national trade deficit. This study investigates whether green hydrogen, produced using surplus hydroelectricity, serves as a viable prospective pathway toward [...]
Metabarcoding supports regional ocean acidification monitoring and identifies novel bioindicators in the Southern California Bight
Published: 2026-05-16
Subjects: Oceanography and Atmospheric Sciences and Meteorology
The impacts of ocean acidification (OA) on marine communities are a growing concern for coastal upwelling ecosystems, such as the Southern California Bight (Bight). Successful management of coastal resources in the face of OA requires accurate assessment tools to understand the status and trends of OA impacts on biological communities. Current methods often rely on the condition of individual [...]