Preprints
There are 7580 Preprints listed.
The effect of plankton vertical migration on primary productivity in a warmer more stratified ocean
Published: 2026-08-13
Subjects: Life Sciences
Marine primary production sustains ocean ecosystems and plays a central role in regulating the global carbon cycle. Current projections suggest that ocean warming will enhance water stratification, limiting the resupply of inorganic nutrients to surface waters, and consequently reduce primary production. This view neglects possible biological feedback mechanisms such as vertical migration by [...]
Fluorapatite Breakdown and Fluor-edenite Formation in the Pristine Winonaite Calate 047 from Chile's Atacama Desert
Published: 2026-08-13
Subjects: Cosmochemistry, Geochemistry, Mineral Physics, Planetary Geochemistry, Planetary Mineral Physics
We report the discovery and characterization of Calate 047, a new amphibole-bearing winonaite found in Chile's Atacama Desert. This meteorite exhibits a fine-grained granoblastic texture with equigranular silicates (70-350 μm) and extremely magnesian compositions (olivine Fa1.6-1.8, low-Ca pyroxene Wo1.46-1.7Fs0.44-1.17, high-Ca pyroxene Wo45.26-45.81Fs0.70-0.93, plagioclase An17.7-18.8). Calate [...]
Annual high-resolution global ambient population estimates from 1975 to 2024
Published: 2026-08-13
Subjects: Environmental Studies, Geographic Information Sciences, Geography, Human Geography, Nature and Society Relations, Other Geography, Physical and Environmental Geography, Remote Sensing, Social and Behavioral Sciences, Spatial Science
Gridded population data support assessments of human exposure, settlement change, infrastructure demand, and access to services, yet global datasets combining annual coverage over multiple decades with fine spatial resolution remain limited. LandScan Mosaic Time Series provides 50 annual estimates of global ambient population distribution at 3 arc-second resolution from 1975 through 2024. The [...]
Stokes flow in logarithmic-viscosity space: velocity renormalization and a reference-operator formulation
Published: 2026-08-13
Subjects: Fluid Dynamics, Physical Sciences and Mathematics, Planetary Geophysics and Seismology
Effective viscosity in crystalline solids commonly depends exponentially on temperature, pressure, composition and other state variables, producing spatial variations over many orders of magnitude and making variable-viscosity Stokes flow numerically demanding. We develop an exact, coordinate-independent reformulation using logarithmic viscosity \(\Lambda=\ln(\eta/\eta_0)\) and renormalized [...]
Coastal Aquifer Energy in Plymouth, UK
Published: 2026-08-13
Subjects: Civil and Environmental Engineering, Engineering
Plymouth, UK, is a city underlain by a coastal karstic aquifer system, impacted by saline intrusion. The aquifer is being investigated as a source of ambient water for a city-wide heat network. Findings of aquifer-energy pumping tests are reported, highlighting the arising opportunities and challenges. The concept presented here deviates from typical aquifer energy systems, in that thermally [...]
A process-based framework for regional landslide debris inundation hazard assessment: application to the West Coast region of New Zealand
Published: 2026-08-12
Subjects: Physical Sciences and Mathematics
Regional landslide debris inundation hazard assessments commonly rely on scenario-based formulations that require explicit enumeration of discrete landslide events. While effective for local studies, these approaches are computationally intensive, sensitive to scenario design choices, and difficult to apply consistently at regional scales where landslide catalogues are incomplete and long-term [...]
Obliquity limit of megathrust earthquakes
Published: 2026-08-12
Subjects: Physical Sciences and Mathematics
The largest earthquakes occur on subduction-zone megathrusts, where plates commonly converge obliquely to trenches and generate trench-parallel strain. How this strain is partitioned between megathrust slip and upper-plate deformation remains uncertain, hindering earthquake recurrence estimates. Here we combine global slab geometry, plate motions, and earthquake focal mechanisms to quantify [...]
Model-Free Relative Permeability Estimation and Oil Recovery Prediction in Reservoir Rocks from Capillary Pressure Curves
Published: 2026-08-12
Subjects: Engineering, Physical Sciences and Mathematics
This paper presents and validates a model-free method for predicting the relative permeability and oil recovery of reservoir rocks directly from the shape of the capillary pressure curve, tested against real reservoir core, digital rock models, and a large soil-hydraulic dataset. Relative permeability is the key saturation function governing production forecasts, water cut, and oil recovery in [...]
Specification conformance, grid resolution and inter-code spread in an independent simulation of the SPE11B CO2 storage benchmark
Published: 2026-08-12
Subjects: Geology
Confidence in geological CO2 storage forecasts rests on simulators whose discrepancies are, for the most part, characterised against each other rather than against a truth. We wrote a two-phase, two-component, fully implicit CO2 storage simulator from scratch, ran it on the SPE11B benchmark to the specification's own reporting resolution (840 × 120 cells, 1,000 yr), and used the reimplementation [...]
Locating the Anthropogenic Drivers of Urban Flooding from Centimetre-Resolution Aerial Imagery: A Reproducible Open-Data Pipeline for the Odaw Basin, Accra
Published: 2026-08-12
Subjects: Earth Sciences, Environmental Sciences, Hydrology, Physical Sciences and Mathematics
Recurrent inundation in metropolitan Accra is, on the preponderance of the evidence, an anthropogenic rather than a climatological phenomenon: its proximate determinants are the obstruction of drainage by solid waste and the encroachment of structures onto watercourses. These determinants are metre-scale and therefore invisible to the moderate-resolution satellite imagery on which prior work has [...]
Fabric- and fluid-constrained ⁴⁰Ar/³⁹Ar geochronology of the northeastern Carajás Province, Amazonian Craton: separating hydrothermalism from Rhyacian and Orosirian reworking of Archean crust
Published: 2026-08-12
Subjects: Geology, Tectonics and Structure
The Carajás Province, southeastern Amazonian Craton, is a polycyclic Archean block in which the ages of rocks, hydrothermal minerals and tectonic fabrics need not coincide. We integrate multiscale structural analysis with fabric-constrained ⁴⁰Ar/³⁹Ar geochronology of amphibole, biotite and white mica selected from mapped fabrics or well-defined hydrothermal assemblages. Although the province [...]
IPOC-Deep: a new seismicity catalog for Northern Chile with >2 million events
Published: 2026-08-12
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics
We present a novel seismicity catalog for Northern Chile, which covers 17 years (2007--2023) of data and contains more than 2.2 million events. Raw waveform data from nearly 200 stations including a range of temporary deployments were processed with state-of-the-art algorithms for phase picking (EQTransformer) and association (PyOcto), after which we performed absolute event relocation in a 2.5D [...]
Machine Learning for GIS-Based Flood Susceptibility Mapping: A Global Bibliometric and Systematic Review of Research Trends and Future Directions (2005-2026)
Published: 2026-08-12
Subjects: Engineering
Flood susceptibility mapping (FSM) has become an essential component of disaster risk reduction and sustainable environmental management, particularly with the growing frequency and severity of flood events under changing climatic conditions. The integration of Geographic Information Systems (GIS) and machine learning (ML) has significantly improved the accuracy and efficiency of flood [...]
ECMWF SEAS5 Seasonal Precipitation Outlook and Preliminary Rainfall-Based Flood Screening for Iraq: October 2026–January 2027
Published: 2026-08-12
Subjects: Earth Sciences, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology, Risk Analysis
This preprint provides a hydrological and hydrogeological interpretation of ECMWF SEAS5 monthly precipitation forecasts for Iraq from October 2026 through January 2027. The analysis uses the ECMWF System 51 ensemble mean initialized on 1 August 2026. The downloaded time-mean total precipitation rate was converted from metres per second to monthly precipitation depth in millimetres using the [...]
Green home-based dialysis and sustainability: A Scoping Review
Published: 2026-08-12
Subjects: Public Health, Rehabilitation and Therapy
Background Climate change is among the foremost threats to global health, and the healthcare sector is itself a substantial source of greenhouse gas (GHG) emissions. Dialysis is one of the most resource- and carbon-intensive treatments in medicine, and homebased modalities have been proposed as a more sustainable alternative to in-centre care. Despite growing interest, the empirical evidence on [...]