Skip to main content

Preprints

There are 7343 Preprints listed.

Manganese Oxidation States Reveal a Continental-Scale Climate-Driven Redox Gradient in Upland Soils

Ke Wen, Eric W. Slessarev, Oliver A. Chadwick, et al.

Published: 2026-07-29
Subjects: Biochemistry, Geochemistry, Soil Science

Soil redox conditions regulate soil organic carbon (SOC) persistence and nutrient availability, yet macroclimatic controls in uplands remain unclear because O2 depletion reflects the interactions of moisture, labile carbon, soil texture, and microbial demand. Here we pair manganese (Mn) oxidation state, an integrative redox proxy, with effective water balance (mean annual precipitation minus [...]

Revisiting Snoke’s (1987) Spectral Expressions: Coefficient Correction and Its Implications for Dynamic Insights

Minkyung Son

Published: 2026-07-29
Subjects: Geophysics and Seismology

Source parameters such as seismic moment, corner frequency, stress drop, radiated energy, and apparent stress are often derived from the Brune (1970) source spectrum. Building on this, Andrews (1986) formulated analytical relations that link those parameters to spectral integrals of squared velocity and displacement, and Snoke (1987) introduced an approximation that enables their practical [...]

MUONITH v1.0 — A Fast Simulation Tool for Multi-directional Muography Observation Design

Seigo Miyamoto, Shogo Nagahara

Published: 2026-07-29
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Multi-directional muography is a non-destructive technique for imaging the three-dimensional density structure of large objects such as volcanoes. Recent developments in detector technology—miniaturization, low-power operation, and weight reduction—are rapidly expanding the range of feasible observation sites, and detector deployment by unmanned aerial vehicles (UAVs) is also being studied; in [...]

Sub-pixel Canopy Phenology reveals divergent Spring transition sequences in Tropical Mixed Deciduous Forest

Mainak Mukhopadhyay, M D Behera

Published: 2026-07-29
Subjects: Biodiversity, Biology, Ecology and Evolutionary Biology, Forest Sciences

Vegetation phenology regulates terrestrial carbon uptake and land–atmosphere interactions, and is commonly inferred from satellite-derived vegetation indices such as the Normalised Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI). However, these observations represent spatially aggregated signals that mask phenological variability among individual tree canopies in [...]

Distributed Acoustic Sensing Recordings of Cryoseismicity Enable Seismic Imaging of Permafrost in Remote Arctic Regions

Ahmad Tourei, Eileen Martin, Gabriel Fernando Rocha dos Santos, et al.

Published: 2026-07-29
Subjects: Geophysics and Seismology, Geotechnical Engineering, Glaciology

Permafrost can be highly heterogeneous, and variability in its subsurface structure under climate warming remains poorly understood despite the critical role of permafrost in Arctic hydrology, ecosystems, and infrastructure stability. Distributed acoustic sensing (DAS) provides a long-term method for dense seismic array monitoring in remote regions with passively recorded seismic activities. We [...]

Thin Ice DEM Model Based on Smoothed Elements: A 2.5-Dimensional DEM Approach for Ice–Structure Interaction Simulation

Oleg Konovalov, Lu Liu, Shunying Ji

Published: 2026-07-29
Subjects: Physical Sciences and Mathematics

The user wants just the updated abstract in plain text format, with α removed.` We present a novel 2.5-dimensional Discrete Element Method (DEM) model, termed the Thin Ice Model (TIM), for efficient simulation of ice-structure interactions in broken and unbroken sea ice fields. The model is based on Voronoi tessellation of a single-layer ice sheet, where the ratio of element area to thickness [...]

SCI-VIS: Lightweight Visibility Tagging for Coastal Camera Monitoring

Michael Reinwald, Ketron Mitchell-Wynne, Zane D'Amico, et al.

Published: 2026-07-29
Subjects: Atmospheric Sciences, Environmental Monitoring, Oceanography, Remote Sensing

Automated assessment of imaging conditions is a necessary pre-processing step for any computer vision pipeline deployed on outdoor cameras subject to atmospheric variability. We describe SCI-VIS, a lightweight per-frame visibility classifier deployed within the Surfline Coastal Intelligence (SCI) pipeline. The Surfline coastal-camera network spans ~1,200 cameras worldwide. SCI-VIS tags each [...]

Assessing the protective role of active agriculture in wildfire exposure in a Mediterranean region

Marcos Rodrigues, Carmen Bentué, Minia Blanco, et al.

Published: 2026-07-29
Subjects: Geography

Global change and rural abandonment are restructuring Mediterranean fire regimes, as landscapes once characterized by heterogeneous agricultural mosaics are progressively replaced by homogenized, drought-limited fuel complexes. This transformation increases the likelihood of high-intensity wildfire events and their associated impacts. This study applied a stochastic fire-spread modeling framework [...]

A Blueprint for Modern Floodplain Management: System Requirements and Architecture for AI-Ready Platforms

Dilara Kizilkaya, Yusuf Sermet, Ibrahim Demir

Published: 2026-07-29
Subjects: Artificial Intelligence and Robotics, Civil and Environmental Engineering, Computer Sciences, Engineering, Hydraulic Engineering, Physical Sciences and Mathematics, Water Resource Management

Floodplain managers play a critical role in mitigating flood risks and ensuring compliance with federal, state, and local regulations. Their daily work often depends on a patchwork of standalone tools, manual processes, and legacy systems that have evolved over time to meet regulatory and community needs. To establish a foundation for next-generation technological solutions, we synthesized [...]

Stress-Conditioned Lightweight Flash-Drought Detection in the US Corn Belt Using MODIS NDVI and ERA5-Land

Gnaneswara Marupilla, Chandhini Bayina

Published: 2026-07-29
Subjects: Hydrology, Meteorology

Flash-drought monitoring by classical indices averages predictive signal across calm and stressed years, blunting the signal exactly where it matters. We show empirically that the coupling between precipitation, soil moisture, vapor pressure deficit (VPD), and NDVI is stress-conditional: the hydrological pathway is visible when vegetation is already under stress (Spearman rho of about 0.18 for [...]

Northward Dust-Induced Shift of Tropical Atlantic Precipitation in CMIP6 Models

Precious Ebiendele, Adeyemi A Adebiyi, John Abatzoglou, et al.

Published: 2026-07-29
Subjects: Life Sciences

Mineral dust has substantially increased since the pre-industrial period, particularly over North Africa and the Atlantic Ocean. However, the impacts of increased dust burden over the tropical Atlantic Ocean on the position of the Intertropical Convergence Zone (ITCZ) and regional precipitation remain poorly resolved. Here, we analyze seven CMIP6 models participating in the Aerosol Chemistry [...]

Intermediate-Evidence Substitution: A Benchmark Design Methodology for Isolating Numerical Derivation from Protocol Execution in Deterministic Climate Verification

Aaditya Anand Thokal

Published: 2026-07-29
Subjects: Computer Sciences, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

We introduce \textbf{Intermediate-Evidence Substitution (IES)}, a benchmark design methodology that changes evidence granularity while preserving task semantics: decisive aggregate statistics in benchmark evidence are replaced with the raw intermediate values from which they are derived, while task labels, decision protocols, thresholds, and evaluation criteria remain unchanged. IES functions as [...]

Residential Structure-Resolved Fuel Loading for Emissions Estimation in a Wildland–Urban Interface Fire

Hanyang Li, Ehsan Goftari, Kamden Conley, et al.

Published: 2026-07-29
Subjects: Engineering

Fuels in the Wildland-Urban Interface (WUI) include a variety of anthropogenic materials connected to historical and socio-economic backgrounds in addition to biomass. Yet current emission inventories rely on uniform fuel loading factors (FLFs) that treat all structures as compositionally identical. In this study, we develop a structure-resolved combustible fuel inventory for ~5,400 single-family [...]

Machine Learning-Based Sedigraph Reconstruction for Enhanced Sediment Yield Estimation in the Upper Blue Nile Basin

Kindie Bitew Worku, Fasikaw A. Zimale, Till Francke, et al.

Published: 2026-07-29
Subjects: Civil and Environmental Engineering, Engineering

Sediment-laden runoff in Ethiopia’s Upper Blue Nile Basin (UBNB) threatens the ecological balance of Lake Tana and the operational efficiency of the Grand Ethiopian Renaissance Dam (GERD), a critical hydropower infrastructure. High sediment loads, driven by intense monsoon rainfall and erodible soils, exacerbate erosion and sedimentation, affecting water quality and the longevity of [...]

Detecting illegal water abstractions using Earth Observation and artificial intelligence: challenges, research gaps, and future directions

Elena Kakoulli, Anastasios Antoniades, Stelios Neophytides

Published: 2026-07-28
Subjects: Artificial Intelligence and Robotics, Environmental Monitoring, Hydrology, Natural Resources Management and Policy, Remote Sensing, Water Resource Management

Water scarcity and unsustainable withdrawals are major environmental challenges, particularly in semi-arid and Mediterranean regions where agriculture places strong pressure on limited hydrological resources. Illegal or unreported water abstractions intensify these pressures by undermining ecosystem stability, policy compliance, and long-term water security. Although Earth Observation (EO) and [...]

search

You can search by:

  • Title
  • Keywords
  • Author Name
  • Author Affiliation