Preprints
There are 7999 Preprints listed.
A registered public-data reproducibility benchmark for the reported PKiKP detection of a Martian inner core
Published: 2026-08-03
Subjects: Astrophysics and Astronomy, Physical Sciences and Mathematics, The Sun and the Solar System
Bi et al. (2025) infer a 600-km Martian solid inner core partly from a PKiKP vespagram peak at 604 ± 2 s after P and −6.5 ± 0.6 s/deg from stacked InSight marsquakes. We present a registered public-data reimplementation; success criteria, windows, and statistical rules were frozen before outcome inspection, and the headline lane uses the public MPS deglitch stage. We recover a local maximum [...]
Scale-dependent controls on forest carbon uptake across hydroclimatic extremes
Published: 2026-04-28
Subjects: Climate, Environmental Monitoring, Forest Sciences, Sustainability
Conifer forests span some of the most climatically contrasting environments on Earth, from energy-limited Boreal systems to water-limited semi-arid ecosystems. Whether their carbon uptake is governed by universal drivers or by site-specific boundary conditions remains unresolved. Using more than two decades of eddy-covariance and multi-depth soil moisture measurements from two climatic [...]
Erosion-driven changes in soil cation exchange capacity quantified using barium isotopes
Published: 2026-04-22
Subjects: Biogeochemistry, Earth Sciences, Geochemistry, Geomorphology, Physical Sciences and Mathematics, Soil Science
Human activities have perturbed the balance between rates of soil erosion and formation, driving declines in soil quality. However, quantifying these soil imbalances remains challenging, especially at large scales. Here we present a novel isotope mass balance approach that can be used to quantify river catchment wide rates of change in cation exchange capacity (CEC), a key soil quality metric, in [...]
Characterization and Meteorological Drivers of Dust Events over California’s Central Valley
Published: 2026-03-09
Subjects: Life Sciences
Dust events in California’s Central Valley pose severe risks to public health, regional air quality, and transportation. Yet, the climatology and meteorological drivers of dust events in the region are poorly characterized due to sparse monitoring and limitations of satellite observations. Using meteorological observations from 15 meteorological stations, we systematically catalog and analyze [...]
Mesozoic ocean plate stratigraphy reveals a Franciscan plate separating Farallon and North America
Published: 2026-04-22
Subjects: Physical Sciences and Mathematics
Ocean plate stratigraphy preserved in the Franciscan Complex recorded the Mesozoic plate tectonic evolution of the North American Cordillera and eastern Pacific basin. New and published ocean floor and accretion ages for Jurassic–Cretaceous oceanic crust, derived from detrital zircons and radiolarians, indicate that eastward younging ocean floor existed between the Farallon and North American [...]
Influence of secular cooling on core-mantle boundary heat flux and mantle plume temperature over 1.8 billion years
Published: 2026-01-20
Subjects: Physical Sciences and Mathematics
Petrological evidence and global heat budgets indicate that the solid Earth has cooled substantially over geological time, yet the influence of secular cooling on mantle dynamics in global 3D models remains poorly quantified. We incorporate secular cooling into 3D global mantle flow models using plate reconstructions extending back 1.8 billion years. The core-mantle boundary (CMB) temperature is [...]
Living on the Edge: Unequal Rise of Global Population Exposure on Steep Terrain
Published: 2026-04-30
Subjects: Environmental Sciences, Sustainability
The global population living on steep terrain is rising, so is their landslide risk. However, hotspots and driving mechanisms of increasing exposure remain poorly understood. We assess changes in global gridded population and settlement characteristics on steep terrain (≥ 10◦ hillslope inclination) aggregated over topographic catchments (mean area ∼10,000 km2) for 1975–2025. We find that about [...]
Improving sub seasonal streamflow prediction for hydrological drought forecasting using machine learning in the Rhine River basin in the Netherlands
Published: 2026-06-04
Subjects: Engineering
Accurate sub seasonal streamflow forecasts are essential for hydrological drought preparedness in large river basins with competing water demands. Traditional process based hydrological models often struggle to represent non linear, non stationary catchment behavior under changing climate and land use conditions. In this study, we develop Long Short Term Memory (LSTM) networks to improve sub [...]
Paleoarchean seawater and seafloor hydrothermal processes: insights from 3.5 to 3.3 Ga carbonate geochemistry
Published: 2026-04-13
Subjects: Life Sciences, Physical Sciences and Mathematics
Carbonates (3.5 to 3.3 Ga) in the East Pilbara Terrane (EPT), Western Australia, including interstitial carbonate between pillow basalts, fracture-filling calcite, sedimentary carbonates and carbonate associated with stromatolites, provide valuable geochemical archives for reconstructing Early Earth environments. This study highlights three key findings: (1) Fracture-filling calcite D-2-W from [...]
Quantifying causal effects of green–blue–gray landscape change on urban thermal outcomes: A spatiotemporal causal machine learning analysis across city scales
Published: 2026-08-03
Subjects: Earth Sciences, Environmental Health and Protection, Environmental Sciences, Sustainability
Optimizing urban green–blue–gray (UGBG) landscapes has become increasingly important for mitigating surface urban heat island (SUHI) intensity under rapid urbanization. However, the causal effects of landscape pattern changes on SUHI remain poorly quantified, particularly regarding their heterogeneity among spatial configuration, urban scales, and temporal periods. This knowledge gap limits the [...]
Geospatial Machine Learning for Predicting Flash Flood Response at Ungauged Appalachian Watersheds: Terrain, Soil, and Land Cover Controls
Published: 2026-04-14
Subjects: Physical Sciences and Mathematics
Flash floods remain among the deadliest weather hazards in the United States, yet the majority of flood-prone watersheds in the Appalachian region lack streamflow monitoring. Predicting flood response characteristics at these ungauged sites requires understanding which landscape properties control hydrologic behavior. This study evaluates whether geospatial basin descriptors derived from [...]
Anthropogenic acceleration of the leaky nitrogen cycle across the global land-river continuum
Published: 2026-04-13
Subjects: Life Sciences
Lateral nitrogen transfer (LNT) along the land-river continuum plays a critical role in regulating global nitrogen (N) cycling and its feedbacks to climate, yet it remains poorly represented in land surface models. Here, we incorporate LNT into a global land surface model within an Earth System Model framework, enabling a process-based quantification of N transport, transformation, and associated [...]
Airborne imaging spectrometer measurements of methane releases under turbulent conditions
Published: 2026-04-24
Subjects: Earth Sciences, Environmental Sciences, Other Earth Sciences, Physical Sciences and Mathematics, Physics
Methane plume detection and quantification from airborne and spaceborne platforms offers a promising approach for monitoring localized greenhouse gas emissions. Its performance must be demonstrated under realistic but controlled conditions. An airborne demonstrator of a compact shortwave infrared imaging spectrometer developed for the AIRMO Earth observation mission was therefore evaluated during [...]
Linking double seismic zones to oceanic lithosphere rheological layering: the role of mid-lithospheric discontinuities
Published: 2026-06-18
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Physical Sciences and Mathematics
The origin of the ubiquitous lower seismic layer (LSL) in double seismic zones (DSZs) within subducting oceanic lithosphere remains one of the most persistent unresolved problems in subduction-zone seismicity. Analysis of recent geophysical observations reveals a close spatial association between the LSL and the oceanic mid-lithospheric discontinuity (MLD), a feature attributed to the [...]
Increasing Floods and Intensifying Droughts: The Future of Hydrological Extremes in a Warming Climate
Published: 2026-04-13
Subjects: Hydrology, Water Resource Management
Understanding how climate change alters the frequency and severity of hydrological extremes is critical for anticipating regional vulnerabilities and guiding adaptation. In this study, we analyze changes in the magnitude, intensity, and duration of extreme streamflow events, both floods and droughts, under RCP4.5 and RCP8.5 scenarios using the FutureStreams dataset. This dataset, driven by [...]