Preprints
There are 6224 Preprints listed.
Comparative Analysis of GHG Calculation Methodologies in Aviation
Published: 2025-10-27
Subjects: Environmental Indicators and Impact Assessment, Sustainability, Transportation Engineering
The aviation sector faces mounting pressure to deliver transparent, comparable greenhouse-gas (GHG) disclosures under European Sustainability Reporting Standards (ESRS). We provide a comparison of aviation GHG methodologies spanning simple factor tools and flight-specific, lifecycle-inclusive approaches. Our approach combines a structured documentation review (retaining calculators that publish [...]
Blue Nitrogen: Global Rates and Economic Importance
Published: 2025-10-26
Subjects: Environmental Studies, Life Sciences
Nitrogen pollution drives widespread coastal ecosystem collapse. In this paper, we argue that mangrove forests represent an undervalued natural mitigation solution for nitrogen pollution. By performing a comprehensive meta-analysis, we reveal that mangroves remove 870 Gg N annually, which represents an economic value reaching $8.7 billion via nitrogen credit-based valuation. This value is more [...]
Fallowed Heat Island: High surface temperature from fallowed agricultural lands increases nearby water demand and reduces crop yield.
Published: 2025-10-25
Subjects: Engineering, Life Sciences
Agricultural land fallowing is a practice of temporarily idling farmlands to maximize soil water storage, restore plant nutrients, and minimize soil erosion hazards. Despite the benefits of land fallowing, it remains unclear to what extent it affects nearby crop productivity. Here, we show that one such effect is through the fallowed heat island, a concept similar to urban heat island, whereby [...]
Mars' Lowest and Highest Points Revisited
Published: 2025-10-25
Subjects: Physical Sciences and Mathematics, Planetary Geomorphology, Planetary Sciences
We present revised values for Mars’ extreme elevations using a blended digital elevation model (DEM) that combines altimetry collected from the Mars Orbiter Laser Altimeter (MOLA) on NASA’s Mars Global Surveyor with stereo imagery from the High Resolution Stereo Camera (HRSC) on ESA’s Mars Express. The widely cited minimum elevation is derived from an earlier MOLA-only DEM which lacks direct [...]
A Static Enthalpy Equilibrium Approach to the Stability of Saturated Sands (Version 2)
Published: 2025-10-25
Subjects: Civil and Environmental Engineering, Civil Engineering, Construction Engineering and Management, Earth Sciences, Engineering, Environmental Engineering, Geotechnical Engineering, Hydraulic Engineering, Mineral Physics, Physical Sciences and Mathematics, Sedimentology
This preprint presents a physical formulaton for the stability of saturated granular systems based on a static enthalpy equilibrium. The approach definnes equilibrium as the balance between the gravitationel potential of the granular framework and the hydraulic work of the pore water. From this energetic condition, the limit state and the transition between stable, metastable, and liquefied [...]
Aerial LiDAR Based, Source Resolved Methane Emissions Inventory: Permian Basin Case Study for Benchmarking U.S. Emissions
Published: 2025-10-24
Subjects: Engineering, Physical Sciences and Mathematics
Reducing methane emissions is one of the quickest ways to slow near-term warming, yet building accurate inventories to track progress towards reduction targets remains challenging. We present a 2024 source-resolved methane inventory for the Permian Basin built from quarterly aerial LiDAR scans that supports benchmarking and provides a scalable framework for operator-level OGMP 2.0 reporting. We [...]
Managing Squeezing Rock Mass with TBM Data Analysis: Rail Link Rishikesh – Karnaprayag (India)
Published: 2025-10-24
Subjects: Geotechnical Engineering
The 125.2 km rail link Rishikesh–Karnaprayag in the Lesser Himalayas of India represents a benchmark in mechanized tunnelling through complex geology. This paper focuses on Tunnel 8, a 14.58 km section excavated primarily using two single-shield hard rock tunnel boring machines (TBM) under challenging conditions characterized by tectonically deformed, partly water-bearing phyllites and high [...]
Intermittent supershear rupture punctuated by barrier-induced stopping phase during the 2025 Mw 7.8 Myanmar Earthquake: Evidence from near-fault strong motion observation
Published: 2025-10-24
Subjects: Geology, Geophysics and Seismology, Physical Sciences and Mathematics
Supershear rupture has been investigated by many studies, yet its exact characteristics during natural earthquakes are not fully clear, due to the paucity of near-field constraints. Here we analyze the strong motion data recorded at a near-fault station during the 2025 Mw 7.8 Myanmar earthquake to estimate the detailed source process around that station. By comparing simulated velocity waveforms [...]
Climate factors related to the dengue incidence in Costa Rica and future projections under scenario SSP5-8.5.
Published: 2025-10-24
Subjects: Environmental Sciences, Oceanography and Atmospheric Sciences and Meteorology, Statistics and Probability
This article has three objectives: 1) modeling the climate-dengue relationship at the smallest administrative division (districts) using high-resolution data; 2) use of an objective algorithm for the selection of predictors that results in parsimonious models, cross-validated to prevent overfitting; and 3) using estimates from CMIP6 climate models to provide mid-century (2035-2065) potential [...]
MPsizeBase: a database for particle size distributed environmental microplastic data
Published: 2025-10-24
Subjects: Physical Sciences and Mathematics
Understanding the sources, dispersion, and health impacts of microplastic (MP) pollution requires quantitative observations in terms of MP number and/or mass concentrations. Measurements of environmental MP fragments or fibers typically target variable size spans within the formal 1 to 5000 µm range, due to different sampling and detection techniques, and are therefore not directly comparable. In [...]
Response of atmospheric convection to surface drying: new insights from isentropic analysis
Published: 2025-10-23
Subjects: Physical Sciences and Mathematics
There is strong evidence that the atmospheric moisture content of several solar system planets, including Earth, has varied over their lifetimes. A growing body of work also documents a range of atmospheric water vapor content on exoplanets. An improved understanding of the coupling between atmospheric moisture availability and convection could yield greater intuition about the past and current [...]
Nondimensional parameter regimes of Arctic ice keel-ocean flow interactions
Published: 2025-10-23
Subjects: Oceanography and Atmospheric Sciences and Meteorology
Sea ice keels modulate upper-ocean momentum and mixing through internal wave (IW) generation, yet their effects are difficult to represent in climate models because their spatio-temporal scales are smaller than those of climate models and difficult to study in idealized simulations because geometry, forcing, and stratification span a large parameter space. We construct a compact description of [...]
Reversal of extreme precipitation trends over the Northeast US in response to aggressive climate mitigation in GFDL SPEAR
Published: 2025-10-23
Subjects: Physical Sciences and Mathematics
Rapid reductions in greenhouse gas (GHG) concentrations are increasingly included in mitigation strategies, yet the response of regional climate extremes to such reductions remain highly uncertain. Here, we assess projected changes in extreme precipitation over the Northeast US under an aggressive overshoot mitigation pathway (SSP5-3.4OS), simulated by the fully coupled 25-km GFDL SPEAR climate [...]
Global presence and absence of ultra-low velocity zones as seen by Sdiff postcursors
Published: 2025-10-23
Subjects: Earth Sciences, Geophysics and Seismology
The core-mantle boundary is a region of significant lateral heterogeneity. Two antipodal large low-velocity provinces (LLVPs) dominate the lower mantle, while smaller but more extreme ultra-low velocity zones (ULVZs) pepper the lowermost mantle in a variety of morphologies. These ULVZs have been linked to both the edges of LLVPs and to plume-related hotspots, the latter of which may plausibly be [...]
Complex Realities, Simple Signals? Global Evaluation of Early Warning Signals for Forest Mortality Events
Published: 2025-10-23
Subjects: Environmental Indicators and Impact Assessment, Environmental Monitoring, Longitudinal Data Analysis and Time Series, Other Ecology and Evolutionary Biology, Other Forestry and Forest Sciences, Sustainability
Forests around the world are increasingly experiencing large-scale regional mortality events as a result of droughts and heat waves. Despite their considerable impacts on the material, non-material, and regulatory contributions of forest ecosystems to people, these mortality events remain difficult to predict. Temporal Early Warning Signals (EWS) based on the concept of Critical Slowing Down [...]