Preprints
There are 6151 Preprints listed.
Subtemperate sliding reduces period of ice stream variability in a simple model
Published: 2025-02-06
Subjects: Glaciology, Non-linear Dynamics
Understanding the formation and evolution of fast flowing ice streams is essential to projecting the centennial-scale response of ice sheets to climate forcings. Slow flowing glaciers or stagnant ice streams can slide at low velocities over a bed that is below the bulk melting point of ice, dissipating small amounts of frictional heat. This phenomenon is typically referred to as subtemperate [...]
From Magma Chambers to Magma Oceans: A Unified Model for the Thermo-chemical-mechanical Evolution of Magma Bodies
Published: 2025-02-06
Subjects: Applied Mathematics, Computer Sciences, Earth Sciences, Physical Sciences and Mathematics, Planetary Sciences
Magma bodies play a critical role in Earth's geological evolution, influencing volcanic activity, crustal differentiation, and planetary-scale processes. Understanding their thermo-chemical and mechanical evolution requires models that integrate fluid dynamics, phase changes, and chemical transport. This study presents a new numerical model that couples these processes using a multi-phase, [...]
A Comprehensive Bibliometric Analysis of Large Language Models in Hydrology and Environmental Sciences
Published: 2025-02-05
Subjects: Civil and Environmental Engineering, Engineering, Environmental Engineering
The application of large language models (LLMs) in hydrology and environmental sciences is expanding rapidly, but a comprehensive understanding of their potential, best practices and application areas are studied extensively. This study conducts a bibliometric analysis of recent scientific literature to evaluate publication trends, citation impact, and the key contributors in LLM-related research [...]
A review of open data for studying global groundwater in social-ecological systems
Published: 2025-02-05
Subjects: Hydrology, Remote Sensing, Water Resource Management
Global data have served an integral role in characterizing large-scale groundwater systems, identifying their sustainability challenges, and informing on socioeconomic and ecological dimensions of groundwater. These insights have revealed groundwater as a dynamic component of both the water cycle and social-ecological systems, leading to an expansion in groundwater science that increasingly [...]
Occurrence of tetraester and mixed ether/ester-bound iso-diabolic acid membrane-spanning lipids in mineral soils
Published: 2025-02-05
Subjects: Life Sciences
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are a suite of membrane lipids that are widely used as empirical proxies for past temperature and pH. Although the stereochemistry of their glycerol moiety suggests that they are produced by bacteria, the exact producers and the biosynthetic pathway of brGDGTs remain unclear. Here we report the occurrence of tetraester and mixed ester/ether [...]
Most Landfill Methane Emissions Escape Detection in EPA21 Surface Emission Monitoring Surveys
Published: 2025-02-05
Subjects: Engineering, Life Sciences
We measured emissions from ten landfills using mobile surveys and Surface Emission Monitoring (SEM) to determine what fraction of emissions that be identified by SEM surveys. Using mobile methane measurements and a back-trajectory attribution and rate estimation method, we measured overall site emissions and those of individual landfill components (active face, closed cells, leachate, etc). We [...]
A New Theory of Global Climate and Ecosystem Change Based on Planetary Orbital Variations
Published: 2025-02-05
Subjects: Education, Physical Sciences and Mathematics
Traditional climate change research has primarily focused on internal factors of Earth, particularly the impact of human activities on greenhouse gas emissions. This paper proposes the "Mao's Theory of Global Climate and Ecosystem Change Based on Planetary Orbital Variations", which suggests that changes in Earth's climate and ecosystems are primarily driven by the orbital variations of external [...]
The b value as a strain meter: a comparison of the 1982-1984 and 2005-2024 volcanic unrest at Campi Flegrei - Italy
Published: 2025-02-05
Subjects: Physical Sciences and Mathematics
The Campi Flegrei caldera has experienced several episodes of volcanic unrest during the last few centuries, most notably in 1982-1984 and 2005-present. These periods of unrest are characterized by ground uplift, seismic swarms, and increased degassing. In this study, we compare the seismicity and associated b value variations during the 1982-1984 and 2005-2024 unrest periods. The b value is [...]
A simple model for predicting agronomy floods in rice fields in Bicol, Philippines
Published: 2025-02-04
Subjects: Physical Sciences and Mathematics
Climate change is expected to intensify the impacts of flood events on agricultural production, particularly in flood-prone regions like the Philippines, where rice farming is heavily affected by frequent typhoons. Flood forecasting and early warning systems can aid in mitigating these risks; however, the insufficient coverage of hydrometric monitoring stations and limited computational resources [...]
Modeling stand-level forest attributes using lidar and Common Stand Exam data
Published: 2025-02-04
Subjects: Forest Management, Natural Resources and Conservation
This study focuses on the development of a lidar-based methodology that recreates stand-level inventory results from Common Stand Exams (CSE). CSE protocols are the U.S. Forest Service’s approach to measuring forest stocking and volume on public lands. Using an open-sourced dataset, stand-level statistics of lidar-derived height metrics, individual tree height, and tree density were generated for [...]
Where has all the Sinter gone? From the Pink and White Terraces, the Greatest Tourist Attraction of the Southern Hemisphere
Published: 2025-02-02
Subjects: Environmental Studies, Geology, Geomorphology, Other Geography, Paleontology, Physical and Environmental Geography, Spatial Science, Stratigraphy, Volcanology
Debate continues over the silica sinter Pink and White Terraces, the greatest tourist attraction of the southern hemisphere. The 1886 Tarawera eruption may or may not have destroyed them by burial or eruption. This research compiles surviving sinter. The volume is unexpectedly tiny, which bears on the debate. A database was developed including photography. A forensic approach was taken to [...]
A New Interpretation of Ptolemy's Germania Magna: Employing Computer-Assisted Image Distortion of a Medieval Map by Donnus Nicolaus Germanus to Examine Post-Glacial Geodynamics in Europe
Published: 2025-02-02
Subjects: Geology, Geomorphology, Geophysics and Seismology, Nature and Society Relations, Other Astrophysics and Astronomy, Other Earth Sciences, Other Geography, Other Planetary Sciences, Planetary Geology, Planetary Geomorphology, Planetary Geophysics and Seismology, Stratigraphy, Tectonics and Structure, The Sun and the Solar System
This paper revisits Claudius Ptolemy's depiction of Germania Magna through a multidisciplinary approach, integrating computer-aided distortion analysis of Donnus Nicolaus Germanus's medieval cartography with geological insights. The study proposes that the region underwent significant and complex transformations, likely influenced by tectonic activity, such as the reactivation of the Caledonian [...]
Predicting Land Surface Temperature With Uncertainty Estimation Using a Community Sensor Network and Machine Learning
Published: 2025-01-31
Subjects: Artificial Intelligence and Robotics, Environmental Indicators and Impact Assessment, Environmental Monitoring, Sustainability
Urban Heat Islands (UHIs) are areas in cities that experience higher temperatures than surrounding areas due to construction features such as buildings, roads, and a general lack of vegetation. UHIs, which pose a threat to public health while also increasing energy usage, are often defined using land surface temperatures. Our study demonstrates how a community sensor network from the Baltimore [...]
Natural Hydrogen Development-Potential and Challenges
Published: 2025-01-31
Subjects: Earth Sciences
Natural hydrogen has recently been identified as a potential source for future energy systems. This paper investigates the technical development potential of natural hydrogen by estimating, for some recent finds and identified prospects, in-place and recoverable hydrogen, well productivity, water production and other byproducts that a future development would have to cater for. Finds are in three [...]
Cross-equatorial northerly surges associated with extratropical cold surges and tropical variability over the Maritime Continent
Published: 2025-01-31
Subjects: Physical Sciences and Mathematics
Cross-equatorial northerly surge (CENS) is characterized by a strengthening of northerly moist monsoon winds over south of the South China Sea in the western Maritime Continent. The CENS typically lasts a few days in boreal winter and is frequently reported as a crucial synoptic forcing of heavy rainfall and flood events over northern Java Island. The occurrence of CENS has been generally [...]