Preprints
There are 6470 Preprints listed.
Elevated in-situ Vp/Vs preceding hydraulic-fracturing-induced earthquakes
Published: 2026-02-04
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics
Effective management of seismic hazard in geo-energy development demands real-time estimates of subsurface fault instability. However, real-time monitoring of pore pressure change during subsurface fluid injection remains challenging. Here, we present a novel high-resolution, non-tomographic monitoring strategy that tracks the ratio of seismic wave speeds (Vp/Vs) as a proxy for pore pressure [...]
Widespread reliance of rainfed crops on upwind irrigated agriculture in India
Published: 2026-02-03
Subjects: Agriculture, Atmospheric Sciences, Climate, Hydrology, Sustainability, Water Resource Management
Rainfed crops account for approximately 40% of India’s food production and support 60% of its livestock. Although linked to oceanic monsoon rainfall, their productivity also depends on terrestrial evaporation, particularly in the non-monsoon season. However, the degree to which rainfed crops also rely on moisture sourced from upwind irrigated areas, remains largely unknown. Using a combination of [...]
ZDR Column Behavior in Real and Simulated X-band Radar Observations of Potentially Tornadic Storms
Published: 2026-02-03
Subjects: Physical Sciences and Mathematics
The primary objective of this research is to characterize distinct differential reflectivity (ZDR) column behavior with respect to height, intensity, and aerial coverage prior to tornadogenesis (failure) in X-band radar observations of supercells. ZDR observations of three supercells observed at high spatiotemporal resolution with X-band polarimetric radar, two tornadic and one nontornadic, are [...]
Energy-Driven Radius Evolution of Chthonian Planets: A Viscoelastic Maxwell Framework with Applications to Earth
Published: 2026-02-03
Subjects: Engineering, Physical Sciences and Mathematics
Chthonian planets—dense rocky or metallic remnants of gas giants stripped of their gaseous envelopes—experience extreme internal pressures and energy densities, making their structural evolution fundamentally different from classical terrestrial planets. We aim to develop a physically grounded framework to describe energy-driven radius evolution in such bodies and to understand how internal [...]
Global Climate Risks for Outdoor Sports Under CMIP6 Scenarios: A Multi-Indicator Assessment Based on WBGT, Heat Index, Heavy Rainfall, and Heatwaves
Published: 2026-02-03
Subjects: Environmental Indicators and Impact Assessment, Physiology
Outdoor sports are increasingly exposed to climatic conditions that challenge athlete safety, performance and event organisation. Despite extensive physiological and epidemiological evidence on heat stress, no global assessment has yet quantified how multiple climate hazards will jointly constrain outdoor sport under future climate change. Here we provide the first global, CMIP6-based, [...]
Hybrid Physics–AI Ecosystem Simulations Improve Biogeochemical Predictions in Temperate Shelf Seas
Published: 2026-02-03
Subjects: Artificial Intelligence and Robotics, Biochemistry, Biogeochemistry, Environmental Health and Protection, Environmental Indicators and Impact Assessment, Environmental Monitoring, Marine Biology, Numerical Analysis and Scientific Computing, Oceanography, Planetary Biogeochemistry, Terrestrial and Aquatic Ecology
Biogeochemical models form a core part of marine forecasting and climate projections, yet they suffer from persistent biases in predicting key ecosystem variables, creating challenges across regional and global scales. To address this, we developed an AI-augmented three-dimensional hybrid framework that integrates machine-learning corrections directly into a process-based model’s productivity [...]
A Multivariable Calculus Sustainability Infusion
Published: 2026-02-02
Subjects: Applied Mathematics, Other Applied Mathematics, Physical Sciences and Mathematics
Climate change is one of the big challenges facing this generation. Given the threats faced by climate change, it is important that everyone have an education that allows them to engage with the issue as an informed member of society. Typical math courses rarely include examples from Earth science or ecology as part of the curriculum. Incorporating sustainability into pre-requisite math classes [...]
Sampling variability under extreme skewness: sample size guidance for future methane measurement campaigns
Published: 2026-02-02
Subjects: Physical Sciences and Mathematics
Methane emissions from the oil and gas sector follow highly right-skewed distributions, making it hard to accurately quantify average emissions with a limited number of measurements. In this study, we probe the statistical implications of sampling (i.e., measuring) from these highly right-skewed distributions, using six US oil and gas basins as an example. For each basin, we provide a minimum [...]
Modelling void fraction distributions in breaking hydraulic jumps
Published: 2026-02-02
Subjects: Engineering
We present two models for predicting void-fraction distributions in hydraulic jumps, addressing the limitations of the conventional two-layer formulation in representing continuous profiles. The first model introduces a two-state convolution to describe the smooth transition between the turbulent shear and roller regions, while the second applies a superposition framework to capture the [...]
Rethinking Vertical Transport of Buoyant Plastics in Open Channels
Published: 2026-02-02
Subjects: Engineering, Physical Sciences and Mathematics
Recent studies have demonstrated that the vertical distribution of positively buoyant plastic particles in turbulent open channel flows can be described by a modified Rouse profile. However, implicit observations in the literature also suggest that floating particles remain confined to the air–water interface due to surface tension forces. To shed more light on this apparent contradiction, we [...]
Ichnoliths as results of authigenesis associated with aquatic animal traces
Published: 2026-02-02
Subjects: Sedimentology
Animal-made bioturbational structures modify physio-chemical conditions and biota on the sediment surface and below. The behavior of the trace makers chiefly causes such changes by sediment irrigation, mucus lining, organic matter storage, microbial gardening etc. Such traces are preferential loci for accumulation of organic material that may foster syn- to post-bioturbational mineral [...]
Coordinated satellite, aircraft, and ground-based observations of a large transient methane release
Published: 2026-02-01
Subjects: Atmospheric Sciences, Environmental Monitoring, Oil, Gas, and Energy
We present results from a Very Large Methane Release (VLMR) experiment evaluating methane retrievals from the Geostationary Operational Environmental Satellites (GOES) Advanced Baseline Imagers (ABIs) and multiple low-Earth-orbit imagers with high point-source detection limits. The experiment coordinated observations of a U.S. gas pipeline blowdown with nine satellites, two aircraft, and a [...]
What Companies Say vs. What Matters: LLM Analysis of Biodiversity Disclosures in Oil and Gas
Published: 2026-01-31
Subjects: Artificial Intelligence and Robotics, Biodiversity, Oil, Gas, and Energy, Sustainability
The power system ecosystem encompasses infrastructure intensive industries such as electric utilities, hydropower operators, oil and gas producers, and mining companies supplying critical minerals. These industries share a common challenge: their physical assets interact extensively with natural ecosystems, creating dependencies and impacts that increasingly draw investor and stakeholder [...]
Chemical Dosage Prediction for Drinking Water Treatment Using Random Forest and Polynomial Regression
Published: 2026-01-31
Subjects: Engineering
Predictive modeling of chemical dosage based on raw water quality can be useful in decision-making in operating a water treatment plant. In this study, two statistical methods, i.e., random forest and polynomial regression, are used for modeling the chemical usages in drinking water treatment based on the measured water quality parameters in source water. The daily chemical dosages and eight [...]
An Accessible NDVI Classification Tool for Urban and Suburban Vegetation Change Analysis
Published: 2026-01-31
Subjects: Geographic Information Sciences, Remote Sensing
This paper presents a web-based research method for studying changes in vegetation in urban and suburban contexts between 2018 and 2024. The system uses the Normalized Difference Vegetation Index (NDVI) to analyze imagery for each time period and classify land surface types. After classification, correlation and regression analysis are applied to explain connections between urbanization and [...]