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Preprints

There are 5726 Preprints listed.

Sequence stratigraphy of the Eocene-Miocene Mrayt Group, North-Western Rif (Morocco)

choukri chacrone, Hamoumi Naima, Silvia Spezzaferri

Published: 2023-07-07
Subjects: Physical Sciences and Mathematics

Detailed sequence stratigraphy of the Eocene-Miocene Mrayt Group in North-Western Rif (Morocco), allow identifying the nature and the sources of the sediment supplies, the sedimentary facies and the depositional environments as well as the factors that controlled the sedimentation. This work made it also possible to identify 16 facies sequences that have never been described before. facies [...]

Improved representation of laminar and turbulent sheet flow in subglacial drainage models

Tim Hill, Gwenn Elizabeth Flowers, Matthew J Hoffman, et al.

Published: 2023-07-07
Subjects: Earth Sciences, Glaciology, Physical Sciences and Mathematics

Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet--channel subglacial drainage model to smoothly transition between laminar and turbulent flow based on the locally computed Reynolds number in a physically [...]

Demystifying the Dynamics of Global and Regional Sea Level Trends from 1993 to 2021

Ashraf Rateb, Bridget R. Scanlon

Published: 2023-07-07
Subjects: Applied Statistics, Earth Sciences, Physical Sciences and Mathematics, Statistical Models

As global sea levels rise, questions persist about the robustness of trends and their dynamics. Here, we offer a fresh perspective by examining the dynamics of global and regional mean sea-level trends using a probabilistic framework applied to the altimetric record. We show that the global mean sea-level (GMSL) rise accelerated from 2.5 mm/yr (1993-2000) to 4.2 mm/yr (2014-2021) with an average [...]

Assessing Precipitation Trends that may inform Aging Dam Overtopping across the USA

Jeongwoo Hwang, Upmanu Lall

Published: 2023-07-07
Subjects: Civil and Environmental Engineering, Climate, Earth Sciences, Hydrology, Risk Analysis

In many cases, persistent or recurrent synoptic circulation patterns lead to multiple wet days that precede an extreme rainfall event. The joint occurrence of high antecedent rainfall and extreme rainfall defines a compound event that may pose a high risk for overtopping of aging dams. Our novel analysis assesses whether there are significant trends across the conterminous United States (CONUS) [...]

Differential effects of climate change on average and peak demand for heating and cooling across the contiguous United States

Yash Vijay Amonkar, James Doss-Gollin, David J Farnham, et al.

Published: 2023-07-07
Subjects: Engineering

While most electricity systems are designed to handle peak demand during summer months, pathways to deep decarbonization generally electrify building heating, thus increasing electricity demand during winter. A key question is how climate variability and change will affect peak heating and cooling demand in an electrified future. We conduct a spatially explicit analysis of trends in [...]

Theoretical and experimental modeling of local scale CO2 flushing of hydrous rhyolitic magma

Alexander Gennadievich Simakin, Vera Devyatova, Andrey Shiryaev

Published: 2023-07-07
Subjects: Physical Sciences and Mathematics

Flushing of hydrous silicic magmas with crustal carbonic fluid may be an important factor controlling the explosiveness of rhyolitic eruptions. We present combined theoretical and experimental study of the interaction of carbonic fluid with a hydrous silicic melt. The process of diffusional equilibration of a CO2 bubble with a silicic melt was simulated numerically in the spherical approximation. [...]

ANSEICCA: a Python package for seismic ambient noise source inversion by cross-correlation modelling

Arjun Datta, Aileni Mahesh

Published: 2023-07-06
Subjects: Physical Sciences and Mathematics

We present ANSEICCA, an open-source package for forward and inverse modelling of seismic ambient noise cross-correlations at local scales, where the effects of Earth's sphericity are negligible. The package implements a nonlinear finite-frequency inversion technique wherein measurements of cross-correlation energy are used to invert for the spatial distribution of ambient noise sources, under the [...]

Ensemble of land-surface air temperatures between 1880-2022 using a revised pair-wise homogenization algorithm

DUO CHAN, Geoffrey Gebbie, Peter Huybers

Published: 2023-07-06
Subjects: Climate, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Various observational estimates of historical land surface air temperature (LSAT) trends differ on account of differences in corrections. Relative to the most-recent estimate provided by NOAA’s Global Historical Climatology Network Monthly Version 4 (GHCNm4), an estimate by Berkeley Earth is 0.02°C warmer and one by the Climate Research Unit (CRUTEM5) is 0.14°C warmer between 1880–1940. Such [...]

Rebuilding Coral Reefs: How tourism can be a driver behind solutions in a changing ocean

Johanna Calle Triviño, Daniela M Rojas-Cano, Laura Angélica Niño-Torres, et al.

Published: 2023-07-06
Subjects: Marine Biology

Coral reefs are threatened by multiple stressors that have driven a decline in the cover of reef-building coral species, resulting in a loss of reef structure and function. Restoration reef science provides useful conservation tools to preserve and restore the key species and ecological functions of these ecosystems. However, gaps remain in restoring ecosystem functions at large scales. This [...]

Assessing vertical accuracy and spatial coverage of ICESat-2 and GEDI spaceborne lidar for creating global terrain models

Maarten Pronk, Marieke Eleveld, Hugo Ledoux

Published: 2023-07-06
Subjects: Applied Statistics, Geomorphology, Remote Sensing

Digital elevation models (DEMs) are a necessity for modelling many large-scale environmental processes. In this study, we investigate the potential of data from two spaceborne lidar altimetry missions, ICESat-2 and GEDI—with respect to their vertical accuracies and planimetric data collection patterns—as sources for rasterisation towards global DEMs. We validate the terrain [...]

360-day to Gregorian calendar climate model output conversion

Jonny Williams

Published: 2023-07-05
Subjects: Climate, Earth Sciences, Meteorology, Physical Sciences and Mathematics

Data from some climate model simulations is in a 360 days per year format, that is, every month is 30 days long. The main reason for this is analytical convenience in creating seasonal, annual and multi-annual means which are an integral part of climate model development and evaluation. This work illustrates a method to convert daily-mean, 360-day calendar climate model data into 'real', [...]

Synchrony dynamics of dissolved organic carbon in high-mountain streams: insights into scale-dependent processes

Lluís Gómez-Gener, Nicola Deluigi, Tom Battin

Published: 2023-07-05
Subjects: Life Sciences, Physical Sciences and Mathematics

In high-mountain landscapes, biological resources such as organic carbon (OC) are often limited and heterogeneously stored in poorly developed soils, snow, ground ice and glaciers. Climate change influences the dynamics of OC mobilization to- and processing into- the recipient streams. These patterns can vary from seasonal (e.g., snow melt in spring) to daily (e.g., ice melt in summer) depending [...]

Can crop production intensification through irrigation be sustainable? An ex-ante impact study of the coastal zone of Bangladesh

Zahirul Haque Khan, Md Saiful Islam, Shume Akhter, et al.

Published: 2023-07-05
Subjects: Civil and Environmental Engineering

In Bangladesh’s south-central coastal zone, there is considerable potential to intensify crop production by growing dry winter season ‘Boro’ rice, maize, wheat, pulses and oilseeds using irrigation from southward flowing and predominantly freshwater rivers. However, the impacts of surface water withdrawal for irrigation and its safe operating space remain unclear. We used field measurements and [...]

Spatio–temporal trends of air quality, Kampala City, Uganda, 2020–2022

Mackline Ninsiima, Alex Ndyabakira, Sarah Zalwango, et al.

Published: 2023-07-05
Subjects: Environmental Sciences

Fine particulate matter (PM2.5) is among the health damaging air pollutants that pose health risks to humans, with levels >15 µg/m3 being associated with adverse health effects. PM2.5 has been recommended as the best measure of air quality. Cities are more prone to poor air quality compared to non–urban areas. We assessed the spatio–temporal trends in air quality in Kampala City during January [...]

Mountains of plastic: Mismanaged plastic waste along the Carpathian watercourses

Maciej Liro, Anna Zielonka, Tim van Emmerik, et al.

Published: 2023-07-05
Subjects: Earth Sciences, Environmental Sciences

Plastic waste poses numerous risks to mountain river ecosystems due to their high biodiversity and specific physical characteristics. Here, we provide a baseline assessment for future evaluation of such risks in the Carpathians, one of the most biodiverse mountain ranges in East-Central Europe. We used high-resolution river network and mismanaged plastic waste (MPW) databases to map MPW along the [...]

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