Preprints
There are 7115 Preprints listed.
Modification of Antarctic geothermal heat flux by groundwater flow
Published: 2026-06-13
Subjects: Fluid Dynamics, Glaciology
The geothermal heat flux to the bed of the ice in Antarctica is important for ice flow and basal meltwater production, but is also highly uncertain. In particular, it is thought that groundwater flow in sedimentary basins could modify the geothermal heat flux to the ice bed by advecting heat, but this process is unaccounted for in current models. In this paper, we develop a mathematical model to [...]
Development of Hydraulic Hazard Mapping within a GIS Environment: Interoperability Between HEC-RAS and QGIS
Published: 2026-06-13
Subjects: Civil and Environmental Engineering, Engineering
Alluvial events represent some of the most destructive natural hazards threatening human civilization. Over recent decades, the frequency of extreme rainfall has exposed the Italian territory to periodic and highly damaging inundations, resulting in a dramatic escalation of financial losses and mortality rates. In regions such as Sicily, several industrial and artisanal clusters are strategically [...]
Valley forests as ecological bottlenecks: Topography and resource concentration structure herbivore use in the Western Ghats
Published: 2026-06-13
Subjects: Animal Sciences, Ecology and Evolutionary Biology, Forest Sciences, Life Sciences, Plant Sciences
Large-herbivore distributions in the Western Ghats are often interpreted through the perspective of protected areas, forest loss, and human disturbance. This perspective can undermine the ecological role of valley forests and riparian lowlands in steep, human-modified landscapes. Evidence from Asian elephants and other large herbivores indicates that habitat use is shaped by interacting filters [...]
Deglacial reconstruction of the spatial extent and intensity of the North Atlantic Subtropical High
Published: 2026-06-13
Subjects: Climate, Physical Sciences and Mathematics
Rainfall-related hazards are growing in southeastern North America (SENA) but well-documented climate-model biases cast doubt on projected rainfall changes. The North Atlantic Subtropical High (NASH) supplies the moisture that drives extreme rainfall in SENA, so reconstructing its past behavior offers a test of model fidelity. Using the hydrogen-isotope composition of leaf-wax biomarkers (δDwax) [...]
GSDD, A Catchment-Scale Global Streamflow Drought Database based on Observed Daily Discharge
Published: 2026-06-13
Subjects: Engineering
Streamflow droughts increasingly threaten global water security, hydropower production, and freshwater ecosystems. Understanding observed streamflow drought characteristics is key to water supply management, energy and food production. However, global drought datasets primarily rely on meteorological indicators (e.g., precipitation and evapotranspiration), while a few offers grid-based [...]
Warming above, cooling below: First model-based quantitative thermal- regime assessment and subsurface thermal evolution of Nivlisen Ice Shelf, East Antarctica, revealing non-equilibrium thermal adjustment and progressive thermal preconditioning
Published: 2026-06-13
Subjects: Physical Sciences and Mathematics
We present the first quantitative thermal characterisation of Nivlisen Ice Shelf, central Dronning Maud Land, East Antarctica, using a one-dimensional heat-transfer model forced by ERA5 surface skin temperatures (1940–2025). For the primary scenario (H = 312 m), the steady-state solution yields a mid-column temperature of −4.89 °C, Péclet number Pe = 4 (intermediate conduction–advection regime), [...]
Permafrost Degradation and Ecological Restoration Technologies in the Northeastern Margin of the Qinghai-Tibet Plateau: A Case Study of Xining and Surrounding Areas
Published: 2026-06-13
Subjects: Engineering
The Qinghai-Tibet Plateau represents the highest-altitude and largest-area permafrost distribution zone in global mid-to-low latitude regions. Its northeastern margin, encompassing Xining City and surrounding areas, constitutes a critical transitional zone where seasonal permafrost and perennial permafrost interweave. Driven by the dual forces of global climate warming and anthropogenic [...]
Modelling the Evolution of Elliptical Röthlisberger Channels
Published: 2026-06-12
Subjects: Fluid Dynamics, Glaciology, Other Mathematics
Subglacial water flow is critical to basal sliding and ice dynamics. Modelling the coupled evolution of subglacial drainage and ice flow remains challenging, however. This study investigates the evolution of the basal ice-water interface by analysing heat and fluid flow in idealised englacial channels. We extend the classical Röthlisberger model for circular channels to elliptical channel [...]
From Public Weather Images to House-Scale Convective Nowcasting: A Latency-Aware, Multi-Source Fusion and Alerting System Built Entirely from Open Data
Published: 2026-06-12
Subjects: Oceanography and Atmospheric Sciences and Meteorology
Short-range convective warning systems are usually evaluated as gridded meteorological products, but many real decisions are point decisions: whether a specific place will be affected in the next minutes to hours, whether the event is electrically active, and when conditions will improve. This paper presents RADARES, a low-cost operational nowcasting and alerting system built entirely from public [...]
An efficient method for deriving volatility basis sets from thermodenuder and particle levitation data.
Published: 2026-06-12
Subjects: Environmental Engineering, Environmental Sciences, Transport Phenomena
Deriving a volatility basis set (VBS) from measurements of particle evaporation in a thermodenuder or single-particle levitation apparatus has traditionally relied on repeated numerical solution of the evaporation equations to find the VBS that best reproduces observed particle sizes. This approach is computationally demanding and offers little insight into the factors that control the retrieval. [...]
PIKART Version 1.1: Release Notes
Published: 2026-06-12
Subjects: Physical Sciences and Mathematics
The PIK Atmospheric River Trajectories (PIKART) catalog is a global, high-resolution catalog of atmospheric rivers (ARs). Version 1.1 (v1.1) addresses two algorithmic bugs present in version 1.0 (v1.0): a boundary artifact at 30°E emerging during the extraction of the background component of the integrated vapor transport (IVT), and an error in the AR tracking algorithm that affected the [...]
A scoping review to map research gaps and opportunities relating to heat-related health hazards in countries surrounding Lake Victoria, Africa.
Published: 2026-06-11
Subjects: Climate, Environmental Public Health, Physical and Environmental Geography, Sustainability
Urban populations in sub-Saharan Africa are at rising risks of climate-related health hazards due to global climate change and uncontrolled rapid urbanization. Despite the increasing recognition of these challenges, the extent to which urban climates impact health outcomes in Africa remains poorly understood. East African countries surrounding the Lake Victoria Basin (Kenya, Uganda, Rwanda, [...]
Novel Data-driven High-Frequency Mass Change Models from GRACE orbit residuals
Published: 2026-06-11
Subjects: Climate, Earth Sciences, Fresh Water Studies, Glaciology, Hydrology, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Other Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
We present a fully data-driven framework for transforming residual K-band range-rate (KBRR) data from GRACE into 5-day mass change models expressed in Equivalent Water Height (EWH). The approach first derives residual range and Line-of-Sight Gravity Differences (LGDs) from monthly post-fit residual range-rates and combines them with 5-day post-fit residuals. A hybrid formulation, merging LGD- and [...]
Historical biogeography of Middle-East mangroves: paleobotanical evidence
Published: 2026-06-11
Subjects: Paleontology
This paper reconstructs the origin, diversification, and decline of Middle East (ME) mangroves from the Late Cretaceous to the present using the MESMA database, a comprehensive compilation of fossil pollen and macrofossil records integrated with paleogeographic, tectonic, climatic and sea-level evidence. To date, global paleobiogeographical and evolutionary syntheses of mangroves have emphasized [...]
High-resolution monthly sectoral water demands for the U.S. over 1980-2100
Published: 2026-06-11
Subjects: Civil Engineering, Hydrology, Water Resource Management
U.S. water demand varies sharply by sector and region as land use, population, weather patterns, and economic activity co-evolve. High-resolution water demand data are required to capture these dynamics and to support integrated energy-water-land modeling and local-to-regional water scarcity assessments. We present a gridded (1/8$^{\circ}$), monthly, multi-sector water demand dataset for the [...]