Preprints
There are 6081 Preprints listed.
Formation and fluxes of natural hydrogen in the crust and upper mantle
Published: 2025-10-10
Subjects: Biogeochemistry, Earth Sciences, Geochemistry
Molecular hydrogen (H2) is a fundamental component of planetary evolution and an important energy source for microbial life. It is now understood that natural mechanisms, spanning geological and biological processes, can produce high concentrations of hydrogen in natural fluids. Quantifying the processes that modulate natural hydrogen concentrations is necessary not only for conceptualising the [...]
Steep nested clinoforms in the mixed siliciclastic-carbonate Sobrarbe Deltaic Complex (Eocene, Aínsa Basin, Spain)
Published: 2025-10-09
Subjects: Earth Sciences, Geology, Sedimentology, Stratigraphy
This study investigates the processes controlling the development of nested clinoforms in outcrops of the Eocene Sobrarbe Deltaic Complex of the Aínsa Basin, highlighting their significance as archives of basin-margin evolution. Small-scale clinoforms record the higher-frequency cycles of delta progradation and the coetaneous development of a carbonate factory, while large-scale clinoforms record [...]
Vegetable supply to Tokyo disrupted by 2023 and 2024 summer heatwaves
Published: 2025-10-09
Subjects: Physical Sciences and Mathematics
Understanding the impacts on urban food supply from extreme climate events is a first step towards building climate-resilient agri-food systems. Here, we report on vegetable supply disruptions in the Tokyo metropolitan area due to the summer heatwaves of 2023 and 2024, using the governmental survey on wholesale market arrival volumes and prices. Fifteen vegetables (broccoli, cabbage, carrot, [...]
No evidence for a 10-m historical tectonic uplift at Mangalia, (Romanian Black Sea coast): Comment on Drăgușin et al. (2025)
Published: 2025-10-09
Subjects: Physical Sciences and Mathematics
Drăgușin et al. (2025) interpreted deposits at Mangalia (Romania) as evidence of a two-phase tectonic event (~14 m subsidence and uplift) during the 18th–19th centuries. Based on multi-proxy data from the same site, we show that this scenario is inconsistent with regional tectonics, stratigraphy, and archaeology. The deposits instead record the gradual infill of a coastal depression episodically [...]
LONG-LIVED TOPOGRAPHY ALONG RIFTED MARGINS: INSIGHTS FROM APARADOS DA SERRA ESCARPMENT, SOUTHEAST BRAZIL
Published: 2025-10-08
Subjects: Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure
The Brazilian margin is one of the longest elevated passive margins (EPMs) in the world. However, both the timing of uplift and the long-term evolution of this EPM remain highly debated. In this study, we present a new suite of apatite (U-Th-Sm)/He (AHe) and fission track (AFT) ages for the southern end of the Brazilian EPM, in the Aparados da Serra plateau. Our results reveal that mean AHe ages [...]
Seasonal ice dynamics control the timing of crevasse drainage at a fast-flowing outlet glacier
Published: 2025-10-08
Subjects: Glaciology
Crevasse field drainage transfers at least half of the seasonal runoff from the surface to the bed of the Greenland Ice Sheet, but the patterns of drainage are complex and spatio-temporally heterogenous. To better understand controls on crevasse drainage processes, we use an automated deep learning method to map the seasonal filling and drainage of water-filled crevasses at Sermeq Kujalleq (Store [...]
Author citation metrics in paleontology: the h-index and the c-score
Published: 2025-10-08
Subjects: Paleontology
The so-called “Stanford ranking” (SR) of standardized citation indicators is based on the calculation of an individual scientist’s c-score, a composite index that addresses the main shortcomings of the h-index. This ranking is updated annually and includes the top 100000 ranked scientists, as well as those within the top 2% in each specialty. This paper focuses on the 500 paleontologists featured [...]
Paleoclimate pattern effects help constrain climate sensitivity and 21st-century warming
Published: 2025-10-07
Subjects: Atmospheric Sciences, Climate
Abstract: Paleoclimates provide examples of past climate change that inform estimates of modern warming from greenhouse-gas emissions, known as Earth's climate sensitivity. However, differences between past and present climate change must be accounted for when inferring climate sensitivity from paleoclimate evidence. The closest paleoclimate analog to near-term warming from greenhouse-gas [...]
Contrasting patterns of deforestation and reforestation in India’s tropical dry woodlands
Published: 2025-10-07
Subjects: Environmental Studies, Remote Sensing, Social and Behavioral Sciences
Tropical dry woodlands are key ecosystems for global biodiversity, carbon storage, and forest-based livelihoods in some of the poorest regions of the world. Many of these woodlands have been historically converted and degraded, and while recovery occurs in some areas, the pressure on remaining tropical dry woodlands remains high. Despite this, our understanding of spatial patterns of tropical dry [...]
Peatland Mid-Infrared Database 1.0.0
Published: 2025-10-06
Subjects: Biogeochemistry, Soil Science, Terrestrial and Aquatic Ecology
Systematic collections of peat mid-infrared spectra and other peat properties are scarce, but useful to understand peat chemistry and develop spectral prediction models. The Peatland Mid-Infrared Database ('pmird') stores 3877 mid-infrared spectra of peat, peat-forming vegetation, and dissolved organic matter, together with measurements of other peat properties that were collated from previous [...]
Methane and nitrous oxide concentrations and sea-air fluxes in western Long Island Sound, a seasonally hypoxic urban estuary: Hourly to seasonal variability
Published: 2025-10-06
Subjects: Physical Sciences and Mathematics
We report the first water column profiles of dissolved methane (CH4) and nitrous oxide (N2O) in western Long Island Sound, an urban estuary in which seasonal hypoxia occurs due to eutrophication and restricted exchange with the ocean. We collected samples at seven stations along an 18 km transect in August 2023, October 2023, and May 2024. CH4 concentrations and sea-air fluxes were highest in [...]
Database of Generated Rock Microstructures and their computed Geometrical and Hydraulic properties
Published: 2025-10-06
Subjects: Earth Sciences, Materials Science and Engineering
There is a strong link between a material’s microstructural features and its macroscopic physical properties. However, heterogeneities in real-world rock microstructures often result in strong cross-correlations between the microscopic features, making it difficult to evaluate the influence of individual characteristics. Minkowski functionals (MFs), a set of measures derived from integral [...]
Geochronology of Taung and other southern African australopiths
Published: 2025-10-06
Subjects: Physical Sciences and Mathematics
One century after the Taung juvenile’s discovery, its age and that of many other southern African australopiths remains unknown. This lack of accurate geochronological constraints leaves important questions unanswered, including the temporal relationship between the South African fossil sites and their well dated eastern African counterparts. Previous age estimates for the Taung fossil range from [...]
Transformer Assisted U-Net for Marine Litter Detection on Sentinel-2 Imagery
Published: 2025-10-06
Subjects: Environmental Monitoring
The contamination of marine environments with man-made litter is a growing nation-wide concern. Satellite imagery combined with deep learning–based detection models has emerged as a robust and cost-effective solution for large-scale marine litter monitoring. In this article, we present a novel deep learning-based scheme to detect marine litter using Sentinel-2 imagery based on the Deep UNet [...]
A Field Study on Background Radiation Variability with Elevation in Eastern Nepal
Published: 2025-10-03
Subjects: Earth Sciences, Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics, Physics
This research investigates how environmental radioactivity varies with altitude in the diverse landscapes of Eastern Nepal. Employing two calibrated Geiger–Müller (GM) counters, background radiation was recorded as counts per minute (cpm) across selected sites in the districts of Dhankuta, Panchthar, Taplejung, and Ilam. Data were geo- referenced using GPS to correlate radiation levels with [...]