Preprints
There are 6347 Preprints listed.
Testing the accuracy and transferability of remotely sensed biomass models across heterogeneous grasslands
Published: 2025-08-28
Subjects: Physical Sciences and Mathematics
Grassland aboveground biomass provides key insights into ecological processes such as carbon sequestration, animal movement patterns, and agricultural management practices. Different model types have been developed to estimate grassland biomass from satellite imagery. However, differences in model performance across sites with different management regimes remain largely understudied. In this [...]
Band ratio to band difference for Chl of oceanic waters: broke a self-imposed no-touch zone
Published: 2025-08-28
Subjects: Education, Physical Sciences and Mathematics
There are many empirical algorithms developed for the remote sensing of chlorophyll-a concentration (Chl) from ocean color measurements, with the blue-green band-ratio type of algorithms dominating these practices. During the phase of algorithm development, which is data-driven, generally the errors of remote sensing reflectance (Rrs) from satellites are ignored until Hu et al. (2012) developed a [...]
Development of Low-Cost, Open-Source Unmanned Surface Vehicle for Water System Monitoring
Published: 2025-08-28
Subjects: Education, Engineering
Commercially available Unmanned Surface Vehicles (USVs) in the market are expensive, and the software used for automating navigation and bathymetry mapping are typically proprietary. Large scale collection of water quantity and quality data requires dynamic in-situ sensing approaches with open-source software for user flexibility. This manuscript presents an open-source, economic, and efficient [...]
Evaluation of biochar produced from coffee husks as an alternative treatment for wastewater contaminated with agrochemicals in the southwestern region of Antioquia.
Published: 2025-08-28
Subjects: Civil and Environmental Engineering
Excessive use of herbicides, pesticides, and fertilizers has enhanced agricultural productivity but has also generated significant environmental impacts and public health risks. Chlorpyrifos, an organophosphorus insecticide, is highly persistent in the environment due to its affinity for organic matter and its ability to be transported via runoff into water bodies, where conventional wastewater [...]
Designing nature-building communities
Published: 2025-08-28
Subjects: Environmental Studies
Urban renaturing efforts increasingly emphasize the role of collaborative governance in managing nature-based solutions (NbS). However, existing frameworks often prioritize institutional perspectives and top-down participation, overlooking the early-stage design needs of grassroots initiatives. This study introduces the concept of Nature-Building Communities (NbCs)—voluntary, community-driven [...]
Two decades of land cover changes in the Colombian Andes
Published: 2025-08-27
Subjects: Environmental Monitoring, Other Earth Sciences
The Colombian Andes faces severe anthropogenic pressures from deforestation, agricultural expansion, mining, and urban development. Given its status as one of the world’s biodiversity hotspot, land cover monitoring for effective conservation strategies and sustainable development planning is essential. While early research relied on coarse or medium-resolution satellite imagery for limited [...]
Surface Expression of Low Basal Friction Upstream of Antarctic Grounding Lines
Published: 2025-08-27
Subjects: Earth Sciences, Glaciology, Physical Sciences and Mathematics
Ice sheets leave contact with the bed at grounding lines, beyond which floating ice shelves experience no friction at their base. In places where basal friction begins to decrease upstream of the grounding line, ice sheets respond more strongly to climate forcing. However, the spatial extent of zones of low grounding line friction is poorly constrained by observations. Here, we use a steady-state [...]
Earthquake body-wave extraction using sparsity-promoting polarization filtering in the time–frequency domain
Published: 2025-08-27
Subjects: Earth Sciences
Seismic waves generated by earthquakes consist of multiple phases that carry critical information about Earth’s internal structure as they propagate through heterogeneous media. Each seismic phase follows its own propagation path and sampling depth, bringing constraints from different regions of the Earth such as the crust, mantle, or even the outer and inner cores. The choice of phase for [...]
Assessing the Economic and Environmental Benefits of Nature-Based Solutions for Sustainable Infrastructure. A Case of Kumasi, Ghana
Published: 2025-08-26
Subjects: Education
Kumasi, Ghana, and most rapidly developing cities in Sub-Saharan Africa are confronted with increasing environmental and infrastructure concerns as a result of rapid urbanization, inadequate land use planning, and climate change. Traditional grey infrastructure has been inadequate in mitigating these problems. This paper assessed the economic and environmental advantages of Nature-Based Solutions [...]
Parasequences and Bedsets : Examples from the Book Cliffs and Wasatch Plateau of Eastern Utah
Published: 2025-08-26
Subjects: Earth Sciences
The Late Cretaceous strata that crop-out in east central Utah (USA) have been central to the development and testing of the sequence stratigraphic paradigm for almost 40 years. Large continuous cliff sections in the Books Cliffs and Wasatch Plateau are composed of shallow marine and coastal plain strata arranged in to cycles that show an upward shallowing of facies interpreted as parasequence. [...]
Creep behaviour of omphacite and amphibole-plagioclase symplectite: The role of heterogeneous hydration in the Tso Morari eclogite during retrogression
Published: 2025-08-26
Subjects: Earth Sciences
Replacement reactions progress to varying degrees depending on the P-T conditions, exhumation rates, and fluid availability. The preservation of reactants and retrogressed products allows for the reconstruction of microstructural and mineralogical progression, which we investigated using electron backscattered diffraction and microprobe analyses on the omphacite, amphibole-plagioclase [...]
Updated Trajectory and Spectral Insights into 3I/ATLAS: A Definitive Case for Natural Astrogeological Origins
Published: 2025-08-25
Subjects: Astrophysics and Astronomy, Earth Sciences, Geology, Other Astrophysics and Astronomy, Other Earth Sciences, Planetary Geology, Planetary Sciences, Planetary Sedimentology, The Sun and the Solar System
As seen in the most recent August 2025 Hubble imagery, the interstellar object 3I/ATLAS makes a strong case for its natural astrogeological origins, which is consistent with my previously published hypothesis that it is a lithified clastic fragment from an exoplanetary sedimentary basin. With an eccentricity of ~1.2 and an inclination of ~44°, refined trajectory data confirms a gravitational [...]
Design and Application of Three-component Force Sensor Principle and Structural Progress
Published: 2025-08-25
Subjects: Engineering
Three-component force sensors are capable of simultaneously detecting force or moment components in three directions in space, and are widely used in robotics, industrial automation, medical equipment, and sports technology. This article focuses on resistive-strain, capacitive, and piezoelectric three-component force sensors. Among them, the resistance strain type three-component force sensor has [...]
Strike-slip restraining screwed fault geometry reconstructed from the 2025 Myanmar earthquake
Published: 2025-08-25
Subjects: Applied Mathematics, Earth Sciences, Physical Sciences and Mathematics
We present a fault surface model of the 2025 Mw 7.7 Myanmar earthquake based on the potency density tensor inversion (PDTI) of teleseismic P-waves combined with surface reconstruction from distributed potency tensor solutions. Our source model demonstrates that the earthquake fault is twisted, varying the dip angle along strike. Inferred fault twists are prominent near fault-segment junctions, [...]
Rethinking glacial retreat and postglacial expansion of the Netropical palm Mauritia
Published: 2025-08-24
Subjects: Plant Sciences
This paper presents an unconventional perspective on the glacial retraction and postglacial expansion of the lowland Neotropical palm Mauritia flexuosa during the last glacial cycle. The classical view holds that this palm was confined to multiple wet refugia during the Last Glacial Maximum (LGM), owing to purported Neotropical-wide arid climates. From these refugia, M. flexuosa is thought to [...]