Preprints
There are 6168 Preprints listed.
Effects of mineralogy on ∆47 and ∆48 of carbonate-derived CO2 below analytical resolution
Published: 2025-02-18
Subjects: Geochemistry
Due to the lack of direct methods capable of determining the abundance of isotopologues containing multiple heavy isotopes within the crystal lattice, carbonates are typically reacted with phosphoric acid to produce CO2 analyte for clumped isotope analyses. This reaction is associated with fractionations of both bulk oxygen and clumped isotopes. Accurate knowledge of the effect of cation [...]
Controlled Release Tests Results for the Methane Lidar Camera
Published: 2025-02-18
Subjects: Physical Sciences and Mathematics
Methane emissions detection using continuous monitors enables round-the-clock monitoring to quickly identify emissions from oil and gas facilities. The SLB methane lidar camera participated in Stanford University’s 2024 Methane Controlled Release Campaign to characterize its performance at detecting, localizing, and quantifying methane emissions from different sources. The camera successfully [...]
Opuntia Invasion Risk and Management Strategies in China: A Comprehensive Review Under Climate Change Scenarios
Published: 2025-02-18
Subjects: Life Sciences
Including China, the genus Opuntia prickly pear cactus has grown to be a quite troublesome invading species in many different countries. With an eye toward Opuntia's ecological effects, present management practices, and suggestions for future control activities, this review assesses the possible distribution and invasion risk of the plant under climate change conditions. We investigate the [...]
Pushing and pulling an algal bloom: physical controls of diel variability in nearshore phytoplankton communities
Published: 2025-02-17
Subjects: Physical Sciences and Mathematics
High-biomass microalgal blooms frequently occur in littoral environments worldwide, often causing noxious effects on aquatic ecosystems and coastal communities. Here, we combine field observations and a simple retention-dispersion model to disentangle the short-term (hours) environmental drivers shaping the nearshore dynamics of such outbreaks. Temperature, salinity, fluorescence, current [...]
Geochemical Dynamics in Organic-Rich Mudstone Reservoirs: Interactions and Implications
Published: 2025-02-16
Subjects: Engineering
This paper explores the intricate geochemical characteristics of organic-rich mudstone reservoirs, focusing on key factors such as thermal maturity, wettability, and adsorption properties. These reservoirs, often referred to as unconventional hydrocarbon systems, are composed of complex organic and inorganic phases that interact dynamically over geological timescales. Understanding these [...]
Quantifying the contributions of climate change and adaptation to mortality from unprecedented extreme heat events
Published: 2025-02-15
Subjects: Environmental Sciences, Physical Sciences and Mathematics
Understanding the mortality effects of the most extreme heat events is central to climate change risk analysis and adaptation decision-making. Accurate representation of these impacts requires accounting for the effects of prolonged sequences of hot days on mortality, the change in that mortality due to anthropogenic forcing, and the potential compensating effects of adaptation to heat. Here, we [...]
Geochemistry and Mineralogy of Ilmenite Exsolutions in Titanomagnetite and Their Implications for the Ore-Forming Process at the Damiao Deposit
Published: 2025-02-15
Subjects: Geochemistry, Geology
The Damiao Fe-Ti-P deposit, located within the Damiao anorthosite complex in northeastern China, features Fe-Ti oxide ores and nelsonites that occur as irregularly inclined stratiform-like bodies, lenses, or veins with sharp contacts against anorthosite and gabbronorite. This deposit is characterized by abundant titanomagnetite that hosts diverse ilmenite exsolution textures, including blocky, [...]
Structuring uncertainty to improve climate change management success
Published: 2025-02-14
Subjects: Environmental Studies
This paper advances the field of climate adaptation by addressing two persistent challenges: navigating multiple forms of uncertainty and enabling the construction of actionable future scenarios. Using a methodology grounded in Decision Making under Deep Uncertainty (DMDU), we combine computational modeling with stakeholder-informed metanarratives to connect abstract analysis with grounded, [...]
Quantitative assessment of tomographic proxies for lowermost mantle composition and mineralogy
Published: 2025-02-14
Subjects: Geophysics and Seismology
Large low velocity provinces (LLVPs) dominate Earth's lowermost mantle, but their detailed thermochemical nature remains a topic of discussion. In particular, it is unclear to what extent the bridgmanite to post-perovskite phase transition is able to explain their seismic velocity characteristics. Robust constraints on the origin of these seismic structures would shed light on large-scale mantle [...]
Positive isotropic components of the 2025 Santorini-Amorgos earthquakes
Published: 2025-02-14
Subjects: Physical Sciences and Mathematics
We used full waveforms of the Hellenic Unified Seismic Network (HUSN) regional stations and a frequency range of 0.03-0.06 Hz. We calculated full moment tensors (MTs) and focused on their ISO and CLVD components. In the tested depth range of 1-20 km, the medians of ISO (=VOL) and CLVD are positive, but their 68% confidence intervals are broad due to the tradeoff of the non-DC with depth. When [...]
Cross-Shelf transport by (storm-modified, sandy) hyperpycnal flows in the Eastern Rhenish Massif during the Upper Eifelian, Middle Devonian
Published: 2025-02-13
Subjects: Physical Sciences and Mathematics
High-resolution sedimentary facies analysis on ten profiles (252.24 m total length) reconstructed a complex depositional system characterised by cross-shelf sediment transport via (storm-modified) hyperpycnal flows in the Unnenberg Formation (Upper Eifelian, Middle Devonian) of the Eastern Rhenish Massif. The hyperpycnal-fed prodeltaic shelf system comprised proximal and distal lobe deposits [...]
Harmonizing past and future global sectoral water use data
Published: 2025-02-13
Subjects: Hydrology
The use of water in the domestic, agricultural, and industrial sectors is necessary for human prosperity and survival. Recognizing the need to understand water scarcity and human contributions to it, various studies have been done over the years, necessitating access to reliable, comprehensive data on historical and projected water use across all sectors. Despite progress in this direction, a [...]
A practical metric for estimating the current climate forcing of natural mires
Published: 2025-02-13
Subjects: Physical Sciences and Mathematics
Commensuration of the radiative effects of different greenhouse gases (GHGs) is crucial for understanding the effects of land cover and ecosystem changes on the global climate. However, none of the current commensuration approaches are suitable for addressing the current climatic effect of mire ecosystems as compared to the situation in which such mires would not exist. The mire ecosystems have [...]
Effects of Stress and Friction Heterogeneity on Spatiotemporal Complexity of Seismic and Aseismic Slip on Strike-Slip Faults
Published: 2025-02-12
Subjects: Physical Sciences and Mathematics
Numerical and laboratory models of earthquake cycles on faults governed by rate-and-state friction often show cycle-invariant behavior, while natural faults exhibit considerable variability in slip history. Possible explanations include heterogeneities in fault stress and frictional properties. We investigate how various types of heterogeneity in simulations of quasi-dynamic sequences of seismic [...]
traveltime: an R package to calculate travel time across a landscape from user-specified locations
Published: 2025-02-12
Subjects: Geographic Information Sciences, Spatial Science
Understanding and mapping the time to travel among locations is useful for many activities from urban planning to public health and myriad others. Here we present a software package — traveltime — written in and for the language R. traveltime enables a user to create a map of the motorised or walking travel time over an area of interest from a user-specified set of geographic coordinates. The [...]