Preprints
There are 5472 Preprints listed.
Stinging News: ‘Dickinsonia’ discovered in the Upper Vindhyan of India Not Worth the Buzz
Published: 2022-12-16
Subjects: Earth Sciences, Physical Sciences and Mathematics
A recent report of Dickinsonia tenuis ‘hiding in plain sight’ at the Bhimbetka rock shelters in rocks of the Maihar sandstone (Upper Vindhyan) has important implications for paleogeography and the age of the Upper Vindhyan. We visited the site in December 2022 and found the evidence for Dickisonia lacking. The ‘fossil’ resembles decayed parts of modern Apis dorsata (giant honeybees) hives. In [...]
Re-examining Temporal Variations in Intermediate-Depth Seismicity
Published: 2022-12-16
Subjects: Geophysics and Seismology
Changes in the frequency of intermediate-depth (60–300 km) earthquakes in response to static stress transfer can provide insights into the mechanisms of earthquake generation within subducting slabs. In this study, we use the most up-to-date global and regional earthquake catalogues to show that both the aftershock productivity of large earthquakes, and the changes in the frequency of [...]
Oxidation Rates and Redox Stabilization of Ferrous Iron in Trioctahedral Smectites
Published: 2022-12-16
Subjects: Biogeochemistry, Geochemistry, Other Earth Sciences, Planetary Biogeochemistry, Planetary Geochemistry
Iron(II)-bearing trioctahedral smectites (saponites) form during anoxic alteration of basaltic rock. They are predicted to have been widespread on the early Earth and are observed in the oceanic subsurface today. Smectite structures, including the occupancy of sites in the octahedral sheet, affect iron redox behavior but the rates and products of trioctahedral smectite oxidation have been largely [...]
Historical & future maximum ocean temperatures
Published: 2022-12-16
Subjects: Oceanography
Marine heatwaves impact ocean ecosystems and are expected to become more frequent and intense with continued global warming. The ability of Earth system models to reproduce the statistical characteristics of extreme ocean temperatures has not yet been tested quantitatively, making the reliability of their future projections of marine heatwaves uncertain. We demonstrate that annual maxima of [...]
Subsurface geologic, geophysical and chronological data for paleo-hydrologic reconstructions in Danube’s lower floodplain - delta system
Published: 2022-12-16
Subjects: Life Sciences
Abstract: Records of paleofloods can be reconstructed from special fluvial sedimentary environments such as oxbows; however, deposits in in such lakes, if they exist at all, are still short, on the order of hundreds of years. Longer sedimentary records need to be developed for evaluating paleo-hydrologic regimes of large rivers transiting from a natural Holocene to Anthropocene. Here we report [...]
A treatise on InSAR geometry and 3D displacement estimation
Published: 2022-12-14
Subjects: Engineering, Physical Sciences and Mathematics
The estimation of displacement vectors for (objects on) the Earth’s surface using satellite InSAR requires geometric transformations of the observables based on orbital viewing geometries. Usually, there are insufficient viewing geometries available for full 3D reconstruction, leading to non-unique solutions. Currently, there is no standardized approach to deal with this problem, resulting in [...]
Barometers behaving badly II: A critical evaluation of Cpx-only and Cpx-Liq thermobarometry in variably-hydrous arc magmas
Published: 2022-12-14
Subjects: Earth Sciences, Geochemistry, Geology, Volcanology
The chemistry of erupted clinopyroxene crystals (±equilibrium liquids) have been widely used to deduce the pressures and temperatures of magma storage in volcanic arcs. However, the large number of different equations parametrizing the relationship between mineral and melt compositions and intensive variables such as pressure and temperature yield vastly different results, with [...]
Thermal stratification and meromixis in four dilute temperate zone lakes
Published: 2022-12-14
Subjects: Life Sciences, Physical Sciences and Mathematics
Four adjacent lakes (Arco, Budd, Deming, and Josephine) within Itasca State Park in Minnesota, USA are reported to be meromictic in the scientific literature. However, seasonally persistent chemoclines have never been documented. We collected seasonal profiles of temperature and specific conductance and placed temperature sensor chains in two lakes for ~ 1 year to explore whether these lakes [...]
Knowledge co-production for decision-making in human-natural systems under uncertainty
Published: 2022-12-14
Subjects: Environmental Studies
Decision-making under uncertainty is important for managing human-natural systems in a changing world. A major source of uncertainty that challenges decisions is rooted in their multi-actor settings, i.e., the poorly understood societal actors with diverse values, complex relationships, and conflicting management approaches. Despite general agreement across disciplines on co-producing knowledge [...]
Transgressive rocky coasts in the geological record: Preserved or eroded? Insights from Miocene granitic rocky shorelines and modern examples.
Published: 2022-12-14
Subjects: Earth Sciences, Geology
Most of modern shorelines are in net erosion. Among these, rocky shorelines are commonly punctuated, with alternating high relief cliffs an incised embayments which host “pocket beaches”. While multiple cases of ancient rocky shorelines associated with low relief ravinement surfaces have been documented in the geological record, deposits formed in pocket beaches and joint-cut hollows are more [...]
Reconciling farmers’ expectations with the demands of the emerging UK agricultural soil carbon market
Published: 2022-12-13
Subjects: Social and Behavioral Sciences
This paper explores farmers’ and land managers’ perceptions of the emerging agricultural soil carbon market in the UK and examines their willingness to adopt soil health management practices to enhance and/or maintain soil carbon stocks and enthusiasm for and interest in participation in soil carbon sequestration schemes. Data were collected through online questionnaires administered to 100 [...]
Shortening ice seasons and changing phenology affect under-ice lake temperature dynamics
Published: 2022-12-13
Subjects: Earth Sciences, Environmental Sciences
Temperate lakes worldwide are losing ice cover but the implications for under-ice thermal dynamics are poorly constrained. Using a 92-year record of ice phenology from a temperate and historically dimictic lake, we examined trends, variability, and drivers of ice phenology and under-ice temperatures. The onset of ice formation decreased by 23 days century-1 which can be largely attributed to [...]
Citizen and Machine Learning-aided High-resolution mapping of urban heat exposure and stress
Published: 2022-12-13
Subjects: Earth Sciences, Environmental Sciences, Physical Sciences and Mathematics
Through conversion of land cover to more built-up, impervious surfaces, cities are creating hotter environments for urban residents. Existing measurements of heat and heat stress, however, are often insufficient to capture intra-urban variability of exposure. This study provides a replicable method for modeling air temperature, humidity, and heat stress over an urban area, engaging citizens in [...]
Satellite-derived solar radiation for intra-hour and intra-day applications: biases and uncertainties by season and altitude
Published: 2022-12-13
Subjects: Physical Sciences and Mathematics
Accurate estimates of the surface solar radiation (SSR) are a prerequisite for intra-day forecasts of solar resources and photovoltaic power generation. Intra-day SSR forecasts are of interest to power traders and to operators of solar plants and power grids who seek to optimize their revenues and maintain the grid stability by matching power supply and demand. Our study analyzes systematic [...]
Use of remote-sensing to quantify the distribution of progradation/erosion along a forced-regressive modern coastline: driving factors and impact on the stratigraphic record
Published: 2022-12-13
Subjects: Geomorphology, Sedimentology, Stratigraphy
The long-term development of ancient and modern coastal distributary distributive fluvial systems (DFSs) during periods of relative sea-level highstand or fall usually drives net-progradation of shorelines. Such systems often develop in periods of relative sea-level highstand or fall and typically record annual to millennial-scale deviations in coastal trajectories. A new continental dataset [...]