Preprints
There are 5476 Preprints listed.
GANSim-surrogate: An integrated framework for conditional geomodelling and uncertainty analysis
Published: 2022-10-24
Subjects: Computational Engineering, Earth Sciences, Environmental Engineering, Fluid Dynamics, Geology, Geophysics and Seismology, Hydrology, Sedimentology
We propose a deep-learning framework (GANSim-surrogate) for conditioning subsurface geomodel realizations to static data and dynamic flow data. The static data includes well facies data, interpreted facies probability maps, and non-spatial global features, while dynamic data can include well data such as pressures and flow rates. The framework consists of a Convolutional Neural Network (CNN) [...]
Multiple ocean oxygenation events during the Ediacaran Period: Mo isotope evidence from the Nanhua Basin, South China
Published: 2022-10-24
Subjects: Earth Sciences, Geochemistry, Geology
The Ediacaran Period (ca. 635–539 Ma) was an eventful interval in Earth history, during which a succession of biological and environmental changes, including episodic ocean oxygenation events (OOEs), may have paved the way for the Cambrian radiations of animal life. To better understand the evolution of ocean redox conditions and to estimate the extent of seafloor oxygenation during this period, [...]
Remote sensing-derived time series of transient snowline altitudes for High Mountain Asia, 1986–2021
Published: 2022-10-24
Subjects: Earth Sciences, Glaciology
This study presents a new dataset of remote sensing-derived Transient Snowline Altitude (TSLA) measurements for glaciers in High Mountain Asia. We use the Google Earth Engine to obtain TSLA data for approx. 28 · 104 glaciers larger than 0.5 km². After filtering and postprocessing, the dataset comprises ca. 9.66 million TSLA measurements with an average of 341 ± 160 measurements per glacier, [...]
Sedimentologika: a community-driven diamond open access journal in sedimentology
Published: 2022-10-23
Subjects: Earth Sciences, Library and Information Science, Sedimentology
Sedimentologika is a community-driven Diamond Open Access (DOA) scientific journal for the publication of work in the broad area of sedimentology and stratigraphy. The journal aims to provide the academic community and society a platform guaranteeing permanent free publication and free access to peer-reviewed scientific studies focusing on all types of sedimentary processes, deposits, and [...]
Energy and Momentum of a Density-Driven Overflow in the Samoan Passage
Published: 2022-10-22
Subjects: Oceanography
The energy and momentum balance of an abyssal overflow across a major sill in the Samoan Passage is estimated from two highly resolved towed sections, set 16 months apart, and results from a two-dimensional numerical simulation. Driven by the density anomaly drop across the sill, the flow is relatively steady. The system gains energy from divergence of horizontal pressure work O(5) kW/m and flux [...]
Seasonally-decomposed Sentinel-1 backscatter time-series are useful indicators of peatland wildfire vulnerability
Published: 2022-10-22
Subjects: Environmental Monitoring, Natural Resources and Conservation, Other Environmental Sciences
Peatlands throughout the boreal forest are expected to experience changes in precipitation, evapotranspiration and temperature due to climate change. Correspondingly, changes in hydrologic regimes could lead to increased drought and occurrence of wildfire. Fire management agencies require information about near-real time wildfire vulnerability in boreal peatlands. Remote sensing tools (e.g., [...]
SHALLOW COMPOSITION AND STRUCTURE OF THE UPPER PART OF THE EXHUMED SAN GABRIEL FAULT, CALIFORNIA: IMPLICATIONS FOR FAULT PROCESSES AND SEISIMIC PROPERTIES
Published: 2022-10-22
Subjects: Physical Sciences and Mathematics
Quantifying shallow fault zone structure and characteristics is critical for accurately modeling the complex mechanical behavior of earthquakes as energy moves within faults from depth. We examine macro- to microstructures, mineralogy, and properties from drill core analyses of fault-related rocks in the steeply plunging ALT-B2 geotechnical borehole (total depth of 493 m) across the San Gabriel [...]
Air Quality-Related Equity Implications of U.S. Decarbonization Policy
Published: 2022-10-22
Subjects: Atmospheric Sciences, Environmental Indicators and Impact Assessment, Environmental Sciences, Sustainability
We quantify potential air pollution exposure reductions resulting from U.S. federal carbon policy, and consider the implications of resulting health benefits for exposure disparities across racial/ethnic groups. We assess reductions in carbon dioxide (CO2) emissions of 50% in 2030 relative to 2005 levels, comparable in magnitude to the 2022 Inflation Reduction Act. Using energy-economic scenarios [...]
Plastics Pollution and the Planetary Boundaries framework
Published: 2022-10-22
Subjects: Environmental Sciences, Environmental Studies
Plastics are novel entities that have exceeded the planetary safe operating space due to extensive and resource-intensive production, uncontrolled environmental releases, and failure to control the chemicals within the materials. This paper examines evidence and discusses how plastics pollution affects Earth-system processes along the impact pathway from production, to release, to environmental [...]
Advances in understanding subglacial meltwater drainage from past ice sheets
Published: 2022-10-22
Subjects: Physical Sciences and Mathematics
Meltwater drainage beneath ice sheets is a fundamental consideration for understanding ice-bed conditions and bed-modulated ice flow, with potential impacts on terminus behavior and ice-shelf mass balance. While contemporary observations reveal the presence of basal water movement in the subglacial environment and inferred styles of drainage, the geological record, including sediments and [...]
Seasonal biodegradation of the artificial sweetener acesulfame enhances its use as a transient wastewater tracer
Published: 2022-10-22
Subjects: Engineering
The persistence of the artificial sweetener acesulfame potassium (ACE) in wastewater treatment and subsequently in the aquatic environment has made it a widely used marker of wastewater in both surface water and groundwater. However, the recently observed biodegradation of ACE during wastewater treatment has questioned the validity of this application. In this study, we assessed the use of ACE [...]
In Defense of Metrics: Metrics Sufficiently Encode Typical Human Preferences Regarding Hydrological Model Performance
Published: 2022-10-19
Subjects: Earth Sciences, Hydrology, Physical Sciences and Mathematics, Water Resource Management
Building accurate rainfall-runoff models is an integral part of hydrological science and practice. The variety of modeling goals and applications have led to a large suite of evaluation metrics for these models. Yet, hydrologists still put considerable trust into visual judgment, although it is unclear whether such judgment agrees or disagrees with existing quantitative metrics. In this study, we [...]
The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula
Published: 2022-10-19
Subjects: Earth Sciences, Geology, Geomorphology, Glaciology, Physical Sciences and Mathematics, Sedimentology
The timing and impact of deglaciation and Holocene readvances on the terrestrial continental margins of the Antarctic Peninsula have been well-studied but are still debated. Potter Peninsula on King George Island (Isla 25 de Mayo), South Shetland Islands (SSI), NW Antarctic Peninsula has a detailed assemblage of glacial landforms and stratigraphic exposures for constraining deglacial landscape [...]
Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula
Published: 2022-10-18
Subjects: Physical Sciences and Mathematics
To provide insights into glacier-climate dynamics of the South Shetland Islands (SSI), NW Antarctic Peninsula, we present a new deglaciation and readvance model for the Bellingshausen Ice Cap (BIC) on Fildes Peninsula and for King George Island/Isla 25 de Mayo (KGI) ~62°S. Deglaciation on KGI began after c. 15 ka cal BP and had progressed to within present-day limits on the Fildes Peninsula, its [...]
Efficient Estimation of Climate State and Its Uncertainty Using Kalman Filtering with Application to Policy Thresholds and Volcanism
Published: 2022-10-18
Subjects: Longitudinal Data Analysis and Time Series, Non-linear Dynamics, Planetary Sciences, Statistical Models
We present the Energy Balance Model – Kalman Filter (EBM-KF), a hybrid model projecting and assimilating the global mean surface temperature (GMST) and ocean heat content anomaly (OHCA). It combines an annual energy balance model (difference equations) with 17 parameters drawn from the literature and a statistical Extended Kalman Filter assimilating GMST and OHCA, either observed timeseries or [...]