Preprints
There are 5427 Preprints listed.
Discussion of Košťák et al. (2021), Fossil evidence for vampire squid inhabiting oxygen-depleted ocean zones since at least the Oligocene.
Published: 2024-10-23
Subjects: Geology, Paleontology
Košťák et al. (2021) is important in presenting the first known Cenozoic fossil of a vampyromorph. Some modifications to the interpretations are needed, however. The first concerns inferring water depth habitat of non-benthic animals from fossils found in deep water sediments. The second concerns the water depth estimates for the La Voulte-sur-Rhône exceptionally preserved biota (La Voulte EPB), [...]
Bioremediation of multiple heavy metals through biostimulation of Microbial-Induced Calcite Precipitation at varying calcium-to-urea concentrations
Published: 2024-10-23
Subjects: Civil and Environmental Engineering, Engineering
Studies on heavy metal bioremediation through Microbial-Induced Calcite Precipitation (MICP) typically involve bioaugmentation approaches that use low calcium-to-urea ratios and target single contaminants. We present an investigation on the efficiency of soils’ autochthonous ureolytic bacteria to simultaneously remediate multiple heavy metals and sequester carbon through urea hydrolysis and MICP [...]
Tropical thermocline helps power Pacific equatorial upwelling
Published: 2024-10-22
Subjects: Physical Sciences and Mathematics
Upwelling in the equatorial Pacific Ocean exerts a primary influence on the Earth’s climate, but there is great uncertainty on whether this influence will intensify or weaken under global warming. The dominant dynamical theory of equatorial upwelling argues that the easterly trade winds ’pull’ water up towards the surface via Ekman suction. In contrast, studies of decadal variability suggest that [...]
Application of machine learning methods to forecast petrophysical properties in basalts of the Serra Geral Group: Implications for carbon storage
Published: 2024-10-22
Subjects: Artificial Intelligence and Robotics, Computer Sciences, Earth Sciences, Environmental Sciences, Geophysics and Seismology, Oil, Gas, and Energy, Physical Sciences and Mathematics
This study applies machine learning techniques for forecasting petrophysical properties (density, porosity, and permeability) in the basalts of the Serra Geral Group, located in the Paraná Basin, Brazil. These properties are crucial for the successful implementation of carbon capture and storage (CCS), an important technology to combat climate change. Employing machine learning models—XGBoost, [...]
Computational Modeling of Climate Change Impacts on Flood Inflows Using Remote Sensing and SWAT: A Case Study of Ban Chat Reservoir, Northern Vietnam
Published: 2024-10-21
Subjects: Earth Sciences, Environmental Sciences, Numerical Analysis and Computation, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
This study examines the changes in land cover and three water quality indicators (chlorophyll-a, colored dissolved organic matter, turbidity) using Sentinel-2 imagery in the Ban Chat hydropower area in Northern Vietnam during the period of 2016--2024. To assess the potential impact of flood flows into the Ban Chat reservoir, key information is extracted from remote sensing data, which is the [...]
DARTS: Multi-year database of AI-detected retrogressive thaw slumps in the circum-arctic permafrost region
Published: 2024-10-20
Subjects: Artificial Intelligence and Robotics, Computer Sciences, Earth Sciences, Geomorphology, Physical Sciences and Mathematics
Retrogressive Thaw Slumps (RTS) and Active Layer Detachment Slides (ALD) are widespread thermal mass-wasting hillslope failures triggered by thawing permafrost. Despite increasing rates of these failures, knowledge about their pan-arctic spatial and temporal distribution remains limited. We present the Database of AI-detected Arctic RTS and ALD footprints (DARTS), the largest hillslope [...]
The Rainy Continental Snow climate: Global comparison with 40 years of snow cover modeled in the Chic-Chocs, northeastern Appalachians mountains.
Published: 2024-10-19
Subjects: Physical Sciences and Mathematics
This study provides a comprehensive analysis of the snow and avalanche climate of the Chic-Chocs region of the Gaspé Peninsula, located in the northeastern Appalachians of eastern Canada. The data revealed two major components of the snow climate: a cold snow cover combined with a maritime influence causing melt/ice layers through rain-on-snow events. The CRCM6-SNOWPACK model chain was good at [...]
Fluoride concentration in groundwater and relationship with the sodium (Na+), potassium (K+), (Ca2+) and magnesium (Mg2+) Fluoride concentration in groundwater
Published: 2024-10-19
Subjects: Environmental Studies
Groundwater is the largest freshwater reserve on the planet, and its quality plays a fundamental role in human well-being and economic development. However, it sometimes contains potentially harmful compounds, such as fluoride in high concentrations, which has led to the implementation of quality standards to ensure water potability. This study evaluates the concentrations of fluoride in [...]
Building Resilient Sanitation Systems in Malawi: Pit-latrine Costs, Collapse, and Management
Published: 2024-10-19
Subjects: Engineering
Despite widespread access to basic sanitation in Malawi, over 75% of the population lacks improved sanitation facilities. This national study investigates the resilience of pit-latrines across Malawi, focusing on the relationship between construction quality, facility lifespan, and collapse frequency. A survey of 268,000 pit-latrines revealed that high-quality latrines (lined and with a slab) [...]
Climate change projects and youth engagement: Empowerment and contested knowledge.
Published: 2024-10-19
Subjects: Environmental Studies
This study investigated youths’ empowerment through EU-funded climate change projects (CCPs) and the role that social research and public engagement have in that process. The importance of considering youth empowerment in a time of climate change is increasingly recognised. Youths are exposed to interrelated health, social, economic, and political vulnerabilities caused by climate change, but [...]
Controls on coastal saline groundwater across North America
Published: 2024-10-18
Subjects: Hydrology
Groundwater is crucial to sustaining coastal freshwater needs. About 32 million people in the coastal USA rely on groundwater as their primary water source. With rapidly growing coastal communities and increasing demands for fresh groundwater, understanding controls of continental-scale coastal groundwater salinity is critical. To investigate what hydrogeological factors (e.g., topography, [...]
Review of Hyperspectral Imaging Techniques: Lithium Redistribution By Pegmatite Weathering
Published: 2024-10-17
Subjects: Physical Sciences and Mathematics
The rising popularity of lithium in battery technology and renewable power sources has thus turned attention to Li-Cs-Ta pegmatites for lithium. This review focuses on a description of hyperspectral imaging (HSI) for studying lithium-repayment processes during the weathering of such pegmatites. Hyperspectral imaging has the potential to provide a non-destructive method to identify and map lithium [...]
Rising Temperatures Increase Risk of Soil Salinity and Land Degradation in Water-Scarce Regions
Published: 2024-10-17
Subjects: Environmental Indicators and Impact Assessment, Soil Science, Sustainability, Water Resource Management
Climate change introduces significant uncertainty when assessing the risk of soil salinity in water-scarce regions. We combine a soil-water-salinity-sodicity model (SOTE) and a weather generator model (AWE-GEN) to develop a framework for studying salinity and sodicity dynamics under changing climate definitions. Using California’s San Joaquin Valley as a case study, we perform first-order [...]
deeptime: an R package that facilitates highly customizable visualizations of data over geological time intervals
Published: 2024-10-17
Subjects: Earth Sciences, Geology, Paleobiology, Paleontology, Stratigraphy
Data visualization is a key component of any scientific data analysis workflow and is vital for the summarization and dissemination of complex ideas and results. One common hurdle across the Earth Sciences and other scientific fields remains the effective and reproducible visualization of data over long time intervals (104 – 107 years). Here I introduce the R package deeptime, which provides [...]
EasyMP™: Diverse and environmentally relevant microplastic reference materials encompassing fragments and fibers
Published: 2024-10-17
Subjects: Physical Sciences and Mathematics
The field of microplastic (MP) research has expanded significantly since the terminology’s inception in 2004. Despite the exponential increase in studies, the availability of environmentally relevant MP reference materials (RMs) remains limited, and no certified MP RMs exist. This study addresses the need for diverse RMs by presenting data on MP RMs of fragments (10-100 µm) and fibers (50-1000 [...]