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Showing 7401 to 7450 of 59105 works
STRUCTURAL AND PETROGRAPHIC STUDY OF CRYSTALLINE ROCKS IN PART OF OBAN MASSIF, SOUTH- EASTERN NIGERIA.
The study aims at differentiating lithologic units, general structural trends and orogenic implications of crystalline rocks within part of Oban Massif, Southeastern Nigeria. Fiel…
Submesoscale potential vorticity
Ertel’s potential vorticity theorem is essentially a clever combination of two conservation principles. The result is a conserved scalar q that accurately reflects vorticity value…
Gravity Wave Weakening During the 2019 Antarctic Stratospheric Sudden Warming
The Antarctic stratospheric sudden warming (SSW) occurred on August 30, 2019, and was a vortex displacement minor warming event. We investigated variations in gravity waves (GWs) …
Glacial Origin of Landform Assemblages in Western Jezero Crater, Mars
HiRISE-based mapping reveals five landform assemblages in western Jezero crater, each defined by a landform association interpretable using Earth-based landsystem models and well-…
The Effect Of An Equatorial Continent On The Tropical Rain Belt. Part 2: Summer Monsoons
The TRACMIP ensemble includes slab-ocean aquaplanet control simulations and experiments with a highly idealized narrow tropical continent (0-45ºW; 30ºS - 30ºN). We compare the two…
Insight into Earthquake Source Processes from Large Global Datasets
Most studies of earthquake source parameters give detailed information about individual earthquakes. A complementary approach is examining large datasets to gain insight into gene…
Coseismic and early postseismic deformation due to the 2021 M7.4 Maduo (China) earthquake
Key Points: • We use Sentinel-1 Synthetic Aperture Radar (SAR) data to derive a finite fault model for the 2021 M7.4 Maduo (Qinghai, China) earthquake • The along-strike averaged …
Environmental Computing and Community Engagement in STEM education: Building Effective and Sustainable Relationships.
Xavier University of Louisiana, in collaboration with the Institute of Earth Science Research and Education (IESRE) run the ECoSTEM project. This project aims to improve the quali…
Towards Validating Wave-Ice Interactions in Climate Models Using In Situ Observations
The retreat of Arctic sea ice coincides with increased ocean surface wave activity, and wave-ice interactions are consequently poised to have a growing influence on the Arctic cli…
Using physics-based machine learning to estimate unobserved quantities: A case study for landscape-scale soil and veget…
While machine learning (ML) techniques have proven to have exceptional performance in prediction of variables that have long and varied observational records, it is not clear how …
Veins of the Earth: a Flexible Framework for Mapping, Modeling, and Monitoring the Earth’s River Networks
The tandem rise in satellite-based observations and computing power has changed the way we (can) see rivers across the Earth’s surface. Global datasets of river and river network …
Non-singular calculation of geomagnetic vectors and geomagnetic gradient tensors
Some spherical harmonic expressions (SHEs) of gravitational and geomagnetic field elements will become infinite when computation point approaches polar regions, as the sine functi…
River and Basin Profiler: a module for extracting watershed boundaries, river centerlines, and catchment statistics
Watersheds serve as natural spatial boundaries whose characteristics are often indicators of the hydrologic processes within them. Watershed characteristics are frequently used as…
Know (all!) your assumptions, investigate the sensitivities: Towards more rigorous thermal history modeling practices
Thermal history models are interpretive tools that incorporate data from chronometers and implement the published kinetics in the context of independent constraints on a sample’s …
Combining X-ray CT and PET imaging to quantify changes in carbon allocation in Maize with AMF
The symbiosis between crops and arbuscular mycorrhizal fungi (AMF) have become an attractive route towards achieving carbon neutral agriculture and reducing the use of chemical fe…
Carbon Sequestration in Basalts: Sidewall Core Characterization Data from the Wallula Basalt Pilot Project
Carbon sequestration in geologic formations is a promising strategy that enables long-term storage of CO2. Continental flood basalts are an attractive storage option, primarily du…
Characterizing Changes in Eastern U.S. Pollution Events in a Warming World
Risk assessments of air pollution impacts on human health and ecosystems would ideally consider a broad set of climate and emission scenarios and the role of natural internal clim…
Mobilizing for energy transition: Tactics from localized anti-coal movement in central Philippines
Developing countries need sufficient, reliable, and affordable energy for economic development; yet, the source of this energy remains contested. In the Philippines, coal-based el…
A Review of the Factors Influencing Arctic Mixed-Phase Clouds: Progress and Outlook
Mixed-phase clouds are ubiquitous in the Arctic and play a critical role in Earth’s energy budget at the surface and top of the atmosphere. These clouds typically occupy the lower…
Developing Multi-scale Modeling Over Australia for the 2019/2020 Extreme Wildfire Season
Modeling atmospheric chemistry across scales with the Multi-Scale Infrastructure for Chemistry and Aerosols (MUSICA) leverages a new regional refinement capability within the NCAR…
Wintertime hydro-dynamic response to anthropogenic aerosol along the west coast of North America
Several studies show anthropogenic aerosols (AAs) can perturb large-scale atmospheric circulation, as well as precipitation associated with the tropical rain belt and monsoons of …
Understanding Active Layer Thickness Variability Under Changing Climatic Conditions Across the North American Taiga-Tun…
In Alaska, pervasive irregularities of permafrost coverage and associated boreal forest heterogeneity within the North American Taiga-Tundra Ecological Transition Zone (TTE) are b…
Deep quantum learning with long short-term memory for geodetic time series prediction: Application to length of day pre…
Deep quantum learning is a relatively new concept in which quantum computing algorithms and/or devices are used to enhance the performance of deep learning approaches. Quantum tec…
Automatic Estimation of Parameter Transfer Functions for Distributed Hydrological Models - Function Space Optimization …
FSO is a symbolic regression method that allows for automatic estimation of the structure and parameterization of transfer functions from catchment data. The FSO method transforms…
Application of an Inexpensive Spark-Induced Breakdown Spectroscopy Instrument for Measurements of Atmospheric Metal Par…
Hazardous air pollutants, also known as air toxics, are defined by the US EPA as pollutants that are known or suspected to cause cancer and other serious health issues. Although t…
Evidence of O+ ions energized by weak fast shocks in the mid-altitude cusp
Oxygen ions, O+, efficiently energized by weak fast shock in the mid-altitude cusp observed by Cluster on 7 November 2004 are investigated in this paper. An interplanetary fast sh…
The magmatic architecture of continental flood basalts I : Observations from the Deccan Traps
Flood basalts are some of the largest magmatic events in Earth history, with intrusion and eruption of millions of km$^3$ of basaltic magma over a short time period ($\sim$ 1-5 Ma…
Beamforming of Rayleigh and Love waves in the course of Atlantic cyclones
The main sources of the ambient seismic wavefield in the microseismic frequency band (peaking in the ~0.04-0.5 Hz range) are the earth’s oceans, namely wind-driven surface gravity…
Contrasting sensitivity of weathering proxies to Quaternary climate and sea-level fluctuations in the southern South Ch…
Tropical marginal seas host important sedimentary archives that may be exploited to reveal past changes in continental erosion, chemical weathering, and ocean dynamics. However, t…
A climatic evaluation of the southern dispersal route
Homo sapiens dispersals out of Africa are often linked to intensifications of the African Summer Monsoon and Indian Summer Monsoon. Current dispersal models advocate that dispersa…
High-Temperature Equation of State of FeH: Implications for Hydrogen in Earth’s Inner Core
While hydrogen is one of plausible major light elements in the core, the high-temperature equation of state (EoS) of Fe-H alloy has not been experimentally examined to the core pr…
A new methodology to produce more skillful United States cool season precipitation forecasts
The water resources of the western United States have enormous agricultural and municipal demands. At the same time, droughts like the one enveloping the West in the summer of 202…
A Capacity Building Initiative to Support the Uptake of Earth Observations for a More Resilient Energy Sector
Access to reliable and sustainable electricity is essential for meeting the needs of society, such as communications, clean water, healthcare, and heating and cooling, both today …
Forward simulation and characteristic analysis on the low field NMR transverse relaxation response of fractured shale r…
Nuclear magnetic resonance technology can be used to simulate the T2 spectrum distribution characteristics of different fracture parameters of fractured shale. Based on scanning e…
A Cenozoic mid-crustal tectonic discontinuity: the Ailao Shan fault, southeastern Tibetan plateau
A crustal section is exposed across the Ailao Shan Tectonic Belt (ALTB) that is suggested to be the accommodation zone of southeastward extrusion of the Sundaland block during the…
Magnetogram-matching Energization and Eruption of Magnetic Flux Ropes
We propose a new technique for energizing coronal magnetic equilibria toward eruptions. We achieve this via a sequence of MHD relaxations of small line-tied pulses of magnetic hel…
Spatial Statistical Mapping of Geomorphometry and Drivers of Gully Erosion of the Sedimentary Basin of South-eastern Ni…
Abstract The south-eastern Nigeria as other parts of the tropics have been experiencing diverse levels of soil erosion for decades. An enquiry of the physical and anthropogenic dr…
The Times of Sand: Applying Cosmogenic 21Ne to Examine the Brief Exposure Times of Quartz Sands throughout Sedimentary …
The sedimentary cycle of quartz sand is comprised of the weathering of source rock, followed by erosion, deposition, then burial, and in some cases, lithification. Over geological…
Hydrochemistry and Controlling Factors in the Upper Indus River Basin (UIRB), Western Himalaya
This study presents the major ion concentrations of waters in the upper Indus River and its Tributaries with the aim to reveal the hydrochemical characteristics and its controllin…
Using Data Assimilation to Understand the Systematic Errors of CHAMP Accelerometer-Derived Neutral Mass Density Data
Accelerometer-derived neutral mass density (NMD) is an important measurement of the variability in upper atmosphere and one of the widely used measurements to calibrate and valida…
Kinematics of footwall exhumation at oceanic detachment faults: solid-block rotation and apparent unbending
Seafloor spreading at slow rates can be accommodated on large-offset oceanic detachment faults (ODFs), that exhume lower crustal and mantle rocks in footwall domes termed oceanic c…
The Relationship Between Large Scale Thermospheric Density Enhancements and the Spatial Distribution of Poynting Flux
Large thermospheric neutral density enhancements in the cusp region have been examined for many years. The CHAMP satellite for example has enabled many observations of the perturb…
Influence of inherited basement structures on the active Sumatran Fault and Volcanic Arc, Indonesia
We present a novel tectonic and structural framework for the Sumatran Volcanic Arc and Sumatran Fault System (SFS), based on a comprehensive compilation of the controls of heterog…
Quantitative analysis of Virtual Water Trade of rice and its implications on Water Sustainability: a case study of India
Limited and declining water resources, increasing demand of water resources from different sectors has posed a major challenge for maintaining water sustainability and thus overal…
The Role of Substorm Injections on the Extreme Geo-Effectiveness Observed in the Inner Magnetosphere on the 8 September…
The event of 8 September 2017 was characterized by the effects of the arrival of two interplanetary coronal mass ejections on September 6 th and 7 th and a resultant geomagnetic s…
Response of the Ionospheric TEC at the American low latitudes to SSW and storm-time induced SSW
We investigated the American low-latitude ionosphere around 75°W during the two 2013 sudden stratospheric warming (SSW) events: one in quiet geomagnetic conditions, and the other …
Multi-Temporal Estimation of Maize Yield and Flowering Time Using UAV-Based Hyperspectral Data
Maize (Zea mays L.) is one of the most consumed grains in the world and improving maize yield is of great importance for food security, especially under global climate change and …
Determination of Solar Wind Angular Momentum and Alfv\’en Radius from Parker Solar Probe Observations
As fundamental parameters of the Sun, the Alfv\’en radius and angular momentum loss determine how the solar wind changes from sub-Alfv\’enic to super-Alfv\’enic and how the Sun sp…
The long term data plan for the DSX mission
The Air Force Research Laboratory’s (AFRL) Demonstration and Science Experiments (DSX) spacecraft was launched on June 25, 2019. Although DSX flight operations were recently compl…
Sensor Fusion for Superpixel Oversegmentation
Scene understanding methodologies (e.g., classification, segmentation, and anomaly detection) can be costly when operating on a per-pixel basis. As remote sensing applications rel…
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