Preprints
There are 6877 Preprints listed.
Closing the Duration Gap in RVT: The Energetic Duration
Published: 2026-04-30
Subjects: Civil and Environmental Engineering, Engineering
Duration is a fundamental descriptor of earthquake ground motion, yet it remains ill-defined across engineering seismology, with numerous threshold-based measures adopted for specific applications. This ambiguity has allowed duration to function as a calibration parameter in analyses such as random vibration theory (RVT), where it is often adjusted to match observed response spectra. This paper [...]
Acceleration and Spatial Reorganization of Bank Erosion under Prolonged Sediment Starvation: Multi-decadal Evidence from the Vam Nao Channel
Published: 2026-04-29
Subjects: Physical Sciences and Mathematics
The reduction in sediment supply in major deltas worldwide is altering the morphological dynamics of river delta systems. However, the way in which this process leads to the spatial reorganization of erosion has not yet been fully quantified. This study analyzes shoreline variations in the Vam Nao channel, Mekong Delta, over the period 1988–2025 in order to clarify the morphological changes of [...]
Evaluating Sampling Bias and Model Uncertainty in Species Distribution Models of Marine Plankton Using Virtual Ecosystem Data
Published: 2026-04-29
Subjects: Life Sciences
Understanding the biodiversity and biogeography of plankton in the ocean is essential for predicting responses to environmental changes and informing ocean conservation and management strategies. Species distribution models (SDMs) are a pivotal tool in this regard. This study used data from a global marine ecosystem model as a testbed to assess the reliability of various SDMs, including [...]
Long-term future Greenland ice loss determined by peak global warming
Published: 2026-04-29
Subjects: Biogeochemistry, Climate, Glaciology
The Greenland ice sheet (GrIS) is known to be very sensitive to climate change, and persistent global warming only slightly higher than today could be enough to completely melt it. However, the implications of a temporary crossing of this temperature threshold for future GrIS mass loss remain unknown. Here we present simulations of the next 10,000 years under different future anthropogenic [...]
Estimating Ice Shelf Thickness in Grounding Zones of the Filchner-Ronne Ice Shelf with Tidal Flexure from ICESat-2
Published: 2026-04-29
Subjects: Glaciology
In the grounding zones of Antarctic ice sheets, grounded ice sheets become floating ice shelves at the triple junction of the ice, ocean, and bedrock. Ice downstream of the grounding line rises and falls with ocean tides while ice upstream of it does not, creating kilometers wide flexure zones. Ice thickness in the flexure zone cannot be well estimated by assuming it is in hydrostatic [...]
Scale-dependent controls on forest carbon uptake across hydroclimatic extremes
Published: 2026-04-29
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 [...]
Large climate model ensembles reveal underdispersion in seasonal Atlantic tropical cyclone counts
Published: 2026-04-29
Subjects: Atmospheric Sciences, Physical Sciences and Mathematics
Seasonal Atlantic tropical cyclone (TC) counts are commonly modeled as a conditional Poisson process, implying that the distribution of possible seasonal outcomes—the range of TC counts that could plausibly occur in a given year—exhibits equidispersion for a given climate state, with its variance equal to its mean. This assumption underlies many statistical frameworks used for seasonal TC [...]
Croplands as thermodynamic agents in a high-CO2 world
Published: 2026-04-29
Subjects: Other Environmental Sciences
Rising atmospheric CO2 is widely expected to influence crops through physiological pathways, yet croplands are also extensive physical interfaces that regulate land–atmosphere energy exchange. Despite covering 12–15% of Earth’s ice-free land surface, their role in surface energy balance under elevated CO2 remains poorly constrained. Most CO2 enrichment studies have not explicitly resolved the [...]
Retrieval of Cloud Optical Thickness Based on FY-4B Geostationary Satellite Multichannel Data Combined with Machine Learning
Published: 2026-04-29
Subjects: Earth Sciences
Accurate real-time retrieval of cloud optical thickness (COT) is of great significance for meteorological operations and climate research. To address the limitations of traditional physical methods, which rely on prior parameters, exhibit slow response times, and suffer from poor adaptability, this study proposes a COT retrieval method based on multichannel data from the FY-4B geostationary [...]
Soil Remineralization in Agroecological Systems: A Critical Review
Published: 2026-04-29
Subjects: Agriculture, Earth Sciences, Environmental Sciences, Life Sciences, Physical Sciences and Mathematics
Soil degradation threatens global food security, human nutrition, biodiversity, water resources, and climate stability by depleting soil organic matter, exhausting nutrient reserves, and disrupting carbon and nitrogen cycles. Conventional input‑intensive agriculture has delivered yield gains but has also contributed to widespread micronutrient deficiencies, nutrient loading of waterways, soil [...]
Assessment of riverbed evolution in the Vam Nao River under the influence of sand mining using a numerical model
Published: 2026-04-28
Subjects: Physical Sciences and Mathematics
Riverbed sand mining is a major anthropogenic driver of sediment imbalance and riverbank erosion in the Mekong Delta. This study investigates its morphological impacts using the hydrodynamic–morphological model HYDIST, coupled with a sand mining source function (Ssm), to directly simulate unsustainable sand mining. The model is applied to the Vam Nao River, a confluence connecting the Tien and [...]
Efficient Full-Waveform Inversion via QR-Based Data Selection
Published: 2026-04-28
Subjects: Earth Sciences, Physical Sciences and Mathematics
Full-waveform inversion (FWI) is computationally intensive due to the large number of data points, forward simulations, and model parameters. However, realistic acquisition geometries often produce highly redundant linearized systems. In this work, we reformulate post-acquisition data selection as a matrix row-subset selection problem acting directly on the Jacobian of the linearized inverse [...]
Quantifying 3D Modeling Errors in Time-Domain Electromagnetics: Implications for Deterministic and Probabilistic Inversions
Published: 2026-04-28
Subjects: Geophysics and Seismology
Subsurface resistivity in geophysics is commonly estimated indirectly from dependent measurements. This relationship can be approximated in a forward operator using physical models, such as Maxwell’s equations for time-domain electromagnetics (TDEM), where measured voltages in receiver coils arise from decaying magnetic fields. In TDEM, the inverse operator usually does not exist, so inversion [...]
Non-Federal Climate Leadership Can Sustain U.S. Emissions Reductions Under Federal Policy Uncertainty
Published: 2026-04-28
Subjects: Engineering, Social and Behavioral Sciences
Recent federal climate policy rollbacks in the United States have slowed progress toward high-ambition climate targets under the Paris Agreement. In the absence of federal climate leadership, there is a growing need to better understand the potential impacts of non-federal climate action. We assess the impacts of recent changes in federal policy, non-federal climate leadership, and potential [...]
Why the Cap-Ferret sand spit is collapsing
Published: 2026-04-27
Subjects: Geomorphology, Hydrology, Oceanography, Sedimentology
The Cap-Ferret sand spit (SW France) exhibits a pattern of coastal instability that combines chronic shoreline retreat (8.7 m·yr⁻¹ at the tip, Robinet et al. 2025), sudden vertical collapses of emplaced structures (WW2 blockhaus 2024, 2026; oyster-farm sector 1936, 1977; Hortense promenade 1999, 2000, 2014, 2019), and progressive deepening of submarine pits (Hortense-Pointe depression volume [...]