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Showing 6551 to 6600 of 59105 works
Spectral induced polarization characterization of non-consolidated clays for varying salinities - an experimental study
Clay material characterization is of importance for many geo-engineering and environmental applications, and geo-electrical methods are often used to detect them in the subsurface…
The dynamics of forearc - back-arc vertical motion: numerical models and observations from the Mediterranean
The evolution of subduction zones influences the rise and demise of forearc and back-arc basins on the overriding plate. We conducted 2D elasto-visco-plastic numerical models of o…
SWx TREC’s Space Weather Data Portal: a launch pad for space weather research
One obstacle to space weather research is the practical challenge of accessing relevant data. Space weather data are housed in disparate repositories, each with its own unique foc…
Impact of the Interannual Variability in Large-Scale Circulation on the Ground-Level Ozone Variability Over Eastern Chi…
Interannual variation in ozone pollution could vary greatly with large-scale circulations. Using empirical orthogonal function (EOF) and singular value decomposition (SVD), we sta…
Transition Metals in Gale Crater, Mars: Perspectives on Global Abundances and Future Exploration
Through rover missions and martian meteorites received on Earth, the surface of Mars has showed unexpectedly elevated concentrations of transition metals usually measured in minor…
Observations of hydrodynamic processes and implications for sediment transport on the deep reef flats (> 10m) of ato…
The Nansha Islands comprise the largest atoll archipelago in the South China Sea that accommodates 15% of global atolls. In contrast to the reef flats of the Indo-Pacific region t…
A Deep Learning Model for Automatic Plastic Waste Monitoring Using Unmanned Aerial Vehicle (UAV) Data
Plastic waste is one of the main factors causing environmental pollution and affecting biodiversity, and identification and detecting plastic waste is the premise of removal and t…
The Continuing Evolution of Laser Ablation (U-Th)/He Methods: From Dates to Intracrystalline Isotopic Distributions
Since initially developing laser ablation (U-Th)/He procedures for high-spatial-resolution dating of monazite more than a decade ago, our research group has refined the technique …
Mechanisms for late 20th and early 21st Century decadal AMOC variability
Recent studies, using data from the OSNAP observational campaign and from numerical ocean models, suggest that surface buoyancy losses over the Iceland Basin and the Irminger Sea …
Storm- and tide-induced infragravity dynamics at an intermediate-to-dissipative microtidal beach
Numerical simulations of a range of wave climates and tide conditions made with the model XBeach are exploited to study propagation, evolution, dissipation, and reflection pattern…
The Eastern Mediterranean charcoal industry: air pollution prevention by the implementation of a new ecological retort …
Earth kilns are still used for charcoal production in the Eastern Mediterranean and worldwide. Until 2016, around 1,600 tons of charcoal were produced in Israel and the Palestinia…
Subglacial channels, climate warming, and increasing frequency of Alpine glacier snout collapse
Alpine glacier retreat has increased markedly since the late 1980s, and is commonly linked to the effects of rising temperature on surface melt. Less considered are processes asso…
Stress-Induced changes in hydrothermal gas discharges along active faults near Mt. Etna volcano (Sicily, Italy)
Near-continuous monitoring both of gas emissions (CO 2 , CH 4 and H 2 S) and of water temperature at Santa Venera al Pozzo thermal springs (SE foot of Mt. Etna volcano, Sicily, It…
A Preliminary Low-Temperature Exhumation Study of the Central Aleutian Islands, Alaska
Exhumation in continental and oceanic arc settings is linked to tectonic and climatic forces that result in some of the highest topography and erosion rates in the world. Regional…
The impact of a Southern Ocean cyclonic eddy on mesopelagic micronekton
Southern Ocean eddies shape the foraging ecology of marine apex predators such as marine mammals and seabirds. A growing number of animal tracking studies show that predators alte…
Seasonal Modulation of Dissolved Oxygen in the Equatorial Pacific by Tropical Instability Vortices
Tropical Instability Vortices (TIVs) have a major influence on the physics and biogeochemistry of the equatorial Pacific. Using an eddy-resolving configuration of the Community Ea…
Modeling the Potential Impact of Dredging the Corpus Christi Ship Channel On Passive Particle Transport
We present a study of the potential impact of deepening the Corpus Christi Ship Channel through Aransas Pass; in particular, we study the effect on the transport of red drum fish …
Distributed Extension across the Ethiopian Rift and Plateau Illuminated by Joint Inversion of Surface Waves and Scatter…
The East African Rift System provides a rare location in which to observe a wide scope of rifting states. Well-defined active narrow rifting in the Main Ethiopian Rift (MER) trans…
Soil respiration phenology improves modeled phase of terrestrial net ecosystem exchange in northern hemisphere
In the northern hemisphere, terrestrial ecosystems transition from net sources of CO2 to the atmosphere in winter to net ecosystem carbon sinks during spring. The timing (or phase…
Radiative Cooling, Latent Heating, and Cloud Ice in the Tropical Upper Troposphere
The radiative cooling rate in the tropical upper troposphere is expected to increase as climate warms. Since the tropics are approximately in radiative-convective equilibrium (RCE…
Nonlinear response of global monsoon precipitation to Atlantic overturn-ing strength variations during Marine Isotope S…
Monsoon rainfall proxy records show clear millennial variations corresponding to abrupt climate events in Greenland ice cores during Marine Isotope Stage 3 (MIS3). The occurrence …
Low-Frequency Modes of Vorticity and Divergence in Monsoon Intraseasonal Oscillation
The low-frequency intraseasonal oscillations (ISOs) dominate the subseasonal variability of the Indian summer monsoon and involve rainbands propagating northward from the equator.…
Post-Perovskite Phase Transition in the Pyrolitic Lowermost Mantle: Implications for Ubiquitous Occurrence of Post-Pero…
We conducted X-ray diffraction (XRD) measurements of a pyrolitic mantle material up to 4480 K at 122-166 GPa in a laser-heated diamond-anvil cell (DAC). Results demonstrate that t…
Virtual sounding of solar-wind effects on the AU and AL indices based on an echo state network model
The properties of the auroral electrojets are studied by modeling the relationships between the solar-wind parameters and the AU and AL indices with a trained echo state network (…
Identifying efficient ensemble perturbations for initializing subseasonal-to-seasonal prediction
The prediction of the weather at subseasonal-to-seasonal (S2S) timescales is dependent on both initial and boundary conditions. An open question is how to best initialize a relati…
Spectral features of Forbush Decrease during Geomagnetic Storms
In this paper, we study the variations of the solar-wind parameters (solar wind velocity, plasma density, and IMF-B z component) and the Earth’s disturbance storm-time index (D st…
What can we learn from observed temperature and salinity isopycnal anomalies at eddy generation sites? Application in t…
Potential vorticity (PV) is a key parameter to analyze the generation and dynamics of oceanic mesoscale eddies. Adiabatic and diabatic processes can be involved in the generation …
Neuro-Fuzzy Kinematic Finite-Fault Inversion: 1. Methodology
Kinematic finite-fault source inversions aim at resolving the spatio-temporal evolution of slip on a fault given ground motion recorded on the Earth’s surface. This type of invers…
The Prodigal Bubble - Celebrating the Return of the Bubble to a Recirculating Suspended Sediment Tower
The measurement and processing of high frequency acoustic backscatter profiles at multiple frequencies is an established technique for measuring suspended sediment load and equiva…
Designing an Observing System to Study the Surface Biology and Geology of the Earth in the 2020s
Observations of Planet Earth from space are a critical resource for science and society. Satellite measurements represent very large investments and United States (US) agencies or…
Exploring altitudinal resolution of Twilight airglow red lines using Twilight Photometer
Twilight Photometer observations were carried out at low latitude station Kolhapur (16 0 39’42.2” N, 74 0 14’20.8” E) India, during the period 1 January 2009 to 31 December 2011 t…
Examining Urban Built-up Volume using High Spatial Resolution SAR and Lidar Data: A Case Study in Detroit, Michigan, USA
Accurate mapping of urban infrastructure, specifically buildings, and extent is a high priority in addressing environmental and socioeconomic problems. Importantly, such mapping m…
Seasonality of the Energy Transfers in the Azores Current
The seasonal variability of the Azores Current energy transfers is studied using the output from a regional ocean model of the Eastern Central North Atlantic, forced by climatolog…
Early Earth Plate Tectonics; A Universal or Craton Specific Feature? Implication from Poisson’s Ratio Calculation of th…
Primary melt compositions and mantle potential temperature (Tp) was calculated for c.a. 3.4 Ga -2.21 Ga volcanic rocks e.g., Basalts, Dikes, Komatiites, Komatiitic-basalts from di…
Complex permittivity formulation for induced polarization effect in transient electromagnetics
We have studied the relevance of permittivity as an indicator of the IP effect in transient electromagnetics. The approach is based on a mathematical formulation of a dielectric m…
Ion-neutral collision frequencies for calculating ionospheric conductivity
Molecular oxygen collides with its first positive ion in the earth’s ionosphere. The collision frequency of this particle pair is used to calculate the electric conductivity. Howe…
Fukushima and Chernobyl: similarities and differences of radiocesium fate and transport in soil-water environment
The ease with which radionuclide moves through the environment and is taken up by plants and animals is determined by its speciation and site-specific environmental characteristic…
SCIENCE AT HOME: SUPPORTING FAMILIES THROUGH INFORMAL EDUCATION PROVIDERS
The NASA Earth Science Education Collaborative (NESEC) project has the goal to enable broad participation in authentic NASA Earth Science STEM experiences for lifelong learners. T…
Evaluation of Multi-reanalysis Products with Radiosonde Observations over the Central Taklimakan Desert
To provide guidance for the use of reanalysis data in the Central Taklimakan Desert (CTD), multiple reanalysis products are evaluated based on the radiosonde data obtained from tw…
Constraining Fault Friction and Stability with Fluid-Injection Field Experiments
While the notion that injecting fluids into the subsurface can reactivate faults by reducing frictional resistance is well established, the ensuing evolution of slip is still poor…
The hydroclimate--vegetation relationship in the southwestern Amazon during the last 20 years
The relationship between multiple hydroclimatic variables and vegetation conditions in the upper Madeira Basin (southwestern Amazon) has been analyzed. Vegetative dynamics are cha…
The Arctic Subpolar gyre sTate Estimate (ASTE): Description and assessment of a data-constrained, dynamically consisten…
A description and assessment of the first release of the Arctic Subpolar gyre sTate Estimate (ASTE_R1), a data-constrained ocean-sea ice model-data synthesis is presented. ASTE_R1…
The zonal shift of the Hadley circulation on interannual time scales
Abstract The large scale tropical circulation, commonly named the Hadley circulation, is a key element in the global heat and moisture transport. Traditionally it is defined as th…
Improving Predictions of Stream CO2 Concentrations and Fluxes using a Stream Network Model: a Case Study in the East Ri…
Rivers and streams are an important component of the global carbon budget, emitting CO 2 to the atmosphere. However, our ability to accurately predict carbon fluxes from stream sy…
Edge displacement scores
As a consequence of a diminishing sea ice cover in the Arctic, activity is on the rise. The position of the sea ice edge, which is generally taken to define the extent of the ice …
A Reduced Order Approach for Probabilistic Inversions of 3D Magnetotelluric Data II: Joint inversion of MT and Surface-…
Joint probabilistic inversions of magnetotelluric (MT) and seismic data has great potential for imaging the thermochemical structure of the lithosphere as well as mapping fluid/me…
Assimilating the Southern Annular Mode over the Common Era using Drought Atlases and a Global Proxy Network
The Southern Annular Mode (SAM) is the leading mode of atmospheric variability in the extratropical Southern Hemisphere, and its variations affect westerly winds, regional storm t…
Identifying the Best Image Classification Algorithm for COVID-19 Diagnosis with a Small, Imbalanced Chest X-Ray Dataset
In this project, I study families of deep learning neural networks that are trained on publicly available chest X-ray datasets to identify the best image classification algorithm …
Hysteresis of viscosity in a solid-liquid two-phase system with slow slip rate
In this study, the role of fluids in a slow slip events (SSEs) regime was examined by investigating the rheological properties of the solid-liquid two-phase system on a laboratory…
Development mechanisms and regional characteristics of the Asian monsoon system
Asian monsoon rainfall impacts one third of the global population and predicting its variability and future change is of clear importance. However, the dynamics of even the climat…
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