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Showing 12351 to 12400 of 22070 works
Statistical Power of Federal Environmental Justice Analyses: False negative errors and implications for American Indian…
Federal agencies in the US must evaluate the environmental justice implications of regulatory actions. Environmental justice analyses frequently use demographic tests to determine…
EFFECTS OF LONG-TERM CLIMATE CHANGES AND GEOCHEMICAL PROCESSES ON MERCURY ACCUMULATION ON SOUTH AMERICAN AND AFRICAN MA…
Marine sediments from the Western and Eastern South Atlantic continental margins are used to reconstruct mercury (Hg) accumulation over the last glacial/interglacial cycle. Sedime…
Characterizing Episodic Tremor and Slip in Cascadia
Episodic Tremor and Slip, or ETS, occurs frequently in Cascadia with recurrence intervals of roughly 8-22 months for large ETS. Characterizing these events is critical to our unde…
Quantifying fate and transport of nitrate in saturated soil systems using fractional-derivative model with reaction
Natural soil systems usually exhibit complex properties such as fractal geometry, resulting in complex dynamics for the movement of pollutants. This study developed a fractional a…
Sr and O Isotope Systematics in the Central Andes: Resolving Crustal and Mantle Contributions to the Evolution of the A…
The combination of Sr and O isotopes allow for the determination of crustal homogenization and hybridization during magma accumulation. We present oxygen isotope values of mineral…
Development and use of garnet-based high-resolution P-T-t paths to constrain the dynamics of Himalayan orogenesis
Tectonic models as a universal outcome generate predictions regarding the travel time paths of rocks as they are displaced due to the application of particular input parameters an…
Hydraulic gradients modulate anomalous transport in an alluvial aquifer system
Upscaled transport models are needed to address regional-scale groundwater quality degradation in major aquifers worldwide, and these models must accurately characterize anomalous…
Global Geochemical Fingerprinting Points to a Mantle Dynamics Coupled with the Supercontinent Cycle
Plate tectonics and mantle plumes are two of the most fundamental solid-Earth processes that operated through much of the Earth’s history. For the past 300 million years, mantle p…
Opening Access to Results of the National Geoscience Faculty Survey
The National Geoscience Faculty Survey (NGFS) was designed to probe how faculty teach in undergraduate geoscience courses, learn about pedagogy and instructional content, and part…
Water Available for Flood-MAR and Reservoir Operations Vulnerability Assessment
Department of Water Resources (DWR), in partnership with the Merced Irrigation District (MID), is conducting a reconnaissance level study to assess the potential of implementing F…
Impacts of Sea Level Rise on Compound Fluvial and Coastal Flooding
The coincidence of fluvial and coastal flooding can lead to compound floods with substantial impacts on human life, property, and infrastructure. Low-lying coastal areas are parti…
Global Multivariate Spectral Analysis of Mercury and the Identification of Geochemical Terrains: Derived from the MASCS…
The visible-infrared spectra of Mercury’s surface show little variation, displaying no distinct spectral features except for the possible spectral identification of sulfide within…
Generation of turbulence in Kelvin-Helmholtz vortices at the Earth’s magnetopause: Magnetospheric Multiscale observatio…
The Kelvin-Helmholtz instability (KHI) at Earth’s magnetopause and associated turbulence are suggested to play a role in the transport of mass and momentum from the solar wind int…
Petrophysical characterization of a Jurassic sedimentary unit associated to a foreland basin proposed for CO 2 geologic…
We present a reinterpretation of a geological section in the Tampico-Misantla oil province made with the purpose of selecting and evaluating possible sites to implement a Geologic…
Monitoring of hydrodynamics under Conservation Agriculture in southern Africa using electrical resistivity imaging
Southern Africa is facing unprecedented strains on its agriculture, including a rapidly increasing population and demand for cereals. The global issues of climate change, water sc…
Our fragmented rivers----mapping human-made river obstructions around the globe
Rivers are an important source of freshwater that support societal needs and natural ecosystems, functioning as both collectors for watersheds and distributors along river corrido…
Variation of the surface coastal current in the marginal sea off the west coast of Sumatra during the Pre-YMC and YMC p…
Variation of the surface coastal current in the marginal sea off the west coast of Sumatra during the Pre-YMC and YMC periods was investigated by the R/V “Mirai” cruises (Pre-YMC …
Travel time and source variation explain the molecular transformation of dissolved organic matter in an Alpine stream n…
Streams and rivers are important components of the carbon cycle as they simultaneously transport and transform terrigenous dissolved organic matter (DOM). The time DOM spends in a…
A review, comparison and wake-up call from two deadly Super Typhoons Hato (2017) and Mangkhut (2018)
Super Typhoons Hato (2017) and Mangkhut (2018) have disastrous impacts on the Philippines and South China. Their evolutions and consequences have received wide attention from vari…
Can the Sublimation of Dry Ice Explain the Flattened, Bilobate Structure and Spin Rate of 2014 MU69?
The New Horizons flyby of MU69 has yielded a wealth of new data on the physical structure and surface chemistry of this cold classical KBO (CCKBO). One surprising discovery is the…
Internally-driven, transient incision from river capture: Sutlej River, western Himalaya
Topographic features are commonly interpreted to represent interactions between tectonic and climate-driven processes. However, recent work has highlighted how drainage reorganiza…
Ballooning-interchange Instability at the Inner Edge of the Plasma Sheet as a Driver of Auroral Beads: High-resolution …
Near the inner edge of the plasma sheet, where the geomagnetic field transitions from dipolar to tail-like, very low values of the northward component of the field (Bz) are known …
Transport upscaling in highly heterogeneous alluvial aquifers, andthe prediction of tracer dispersion at the Macrodispe…
We present an upscaled model to predict the plume evolution in highly heterogeneous alluvial aquifers. The model is parameterized exclusively by the mean, variance and correlation…
Sun-Induced Fluorescence's Correlation to Carbon-Flux Increases When Raw Data is Adjusted to Account for Vegetation Bio…
The quantification and monitoring of photosynthesis are essential to understand the global carbon cycle and vegetation’s responses to climate. Among the different remotely-sensed …
Rising methane emissions from Finnish lakes due to climate warming and increasing ice-free days
Lakes account for about 10% of the boreal landscape and are responsible for approximately 30% of biogenic methane emissions. However, its quantification is still of large uncertai…
The impact of initial tracer profile on the exchange and on-shelf distribution of tracers induced by a submarine canyon
Submarine canyons enhance cross-shelf mass exchanges, which are a key component of on-shelf nutrient budgets and biogeochemical cycles. Previous studies assume that canyon-induced…
Precipitation of Relativistic Electrons Under Resonant Interaction with Electromagnetic Ion-Cyclotron Wave Packets
We use numerical simulations to study the resonant interaction of relativistic electrons with rising-frequency EMIC wave packets in the H band. We find that precipitation fluxes a…
Quantifying nitrous oxide emissions from agriculture in the Midwest of the U.S.
Atmospheric nitrous oxide (N2O) is, after carbon dioxide and methane, the third most important long-lived anthropogenic greenhouse gas in terms of radiative forcing. Since preindu…
Terra Trends: A Global Slowdown in Decreasing Atmospheric CO and the Regional Interpretation Using AOD
Atmospheric carbon monoxide (CO) has been decreasing globally for the last two decades. Recently, positive fire trends in Northern Hemisphere boreal regions may have impacted the …
Comparison of Surface Radio Refractivity Variability in the Northern and Southern of Quebec, Canada
A 39 years of archived meteorological data measured at two stations located in the northern and southern parts of the Quebec, Canada is used to estimating the surface refractivity…
The Madden-Julian Oscillation affects crop yields around the world
Understanding what causes weather-related stresses that lead to crop failures is a critical step towards stabilizing global food production. While there are many sources of weathe…
Enhanced Water Vapor in the Dusty Saharan Air Layer: Radiative Impacts
Traditionally, the Saharan Air Layer (SAL) is defined as an elevated dry layer, frequently containing mineral dust transported from North Africa. The presence and characteristics …
A High-Resolution Model for the Assessment and Forecasting of Wildfire Susceptibility
During the last decade, wildfires in the Aburrá Valley watershed, located in northwestern Colombia, have caused significant forest and ecosystem losses, health issues in nearby co…
Open Tools for NEON Data: Lessons from Open Code Development by NEON Scientists and the NEON User Community
An engaged community of scientific programmers is an invaluable asset to any open data provider. The National Ecological Observatory Network (NEON) is a long-term observatory focu…
Expanded Dimensionality for Image Spectroscopy via Machine Learning
The generalized solution for the radiance equation is expanded by exploiting multiple hyperspectral image scans acquired by aerial platforms at different viewing angles. A machine…
A clock for solar and geomagnetic activity
The frequency of major solar eruptions, and their space weather impacts at earth vary with the cycle of solar activity but large amplitude events can occur at any time. Each solar…
Auroral Image Classification with Deep Neural Networks
Results from a study of automatic aurora classification using machine learning techniques are presented. The aurora is the manifestation of physical phenomena in the ionosphere-ma…
A Quantum Mechanical Approach for Data Assimilation in Climate Dynamics
A framework for data assimilation in climate dynamics is presented, combining aspects of quantum mechanics, Koopman operator theory, and kernel methods for machine learning. This …
Validation of SAGE III/ISS Solar Ozone Data with Correlative Satellite and Ground Based Measurements
The Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS) was launched on February 19, 2017 and began routine operation in June 2017. The …
On-demand Model Validation Built into Infectious Disease Early Warning Systems: Malaria Forecasts in Ethiopia with R pa…
Developing and implementing a malaria early warning system that integrates public health surveillance with monitoring of related environmental factors is the goal of the Epidemic …
Statistics of Flow Channels Observed as Regions of Ion Heating in Energetic Neutral Atom Images
Reconnection in the magnetotail transfers magnetic energy to thermal and kinetic energy in ions and electrons. These particles are injected both Earthward and tailward from the re…
Planning for resilience: the Hazard Education and Resilience Awareness Task (HEART) Force empowers youth to lead the re…
The impacts of climate change are being felt across the country, with wildfire seasons getting longer and more severe and flooding occurring more frequently. Colorado has experien…
Thermal Modeling of Ice Penetrators for Ocean Worlds
Starting in 2010 with the VALKYRIE cryobot project (NASA ASTEP), Stone Aerospace has been investigating methods to penetrate thick layers of ice. The focus of these methods is to …
Air Parcel Trajectory Analysis to Identify the Effects of Low Cloud Formation on High-Latitude Cold Air Outbreaks in Wa…
In the present-day climate, cold air outbreaks occur when marine air intrudes over high-latitude continental interiors and radiatively cools, producing an abrupt drop in surface a…
A global sensitivity analysis of thermal conditions in urban street canyons to physical morphology and vegetation param…
Extreme heat exposure as a result of the interactions between heat waves and urban heat islands can lead to resident fatalities. Heat exposure is already the leading environmental…
Spatio-temporal variability of clouds and associated shortwave radiative effects in West Africa with a satellite-based …
This study aims to understand and document the occurrence and variability of cloud cover in West Africa (WA) essential for assessing feasibility of planned large-scale solar energ…
Potential use of Subsidence Rates Determined From GPS-Based Height Modernization Measurements of NGS Benchmarks in Sout…
This study determines the rates of subsidence or uplift in coastal areas of SE Texas by comparing recent GNSS measurements to the original orthometric heights of 340 previously in…
Cloud Properties from MODIS and VIIRS for CERES: Intercomparison and Validation with CALIOP
The Clouds and the Earth’s Radiant Energy System (CERES) project monitors Earth’s long-term energy balance and produces data products which have improved our understanding of the …
Relocating the Antarctic Core Collection: The Story of a Large-Scale Data Rescue Initiative for an Historic Collection …
The story the Antarctic Core Collection’s (ACC) transition from Florida State University (FSU) to Oregon State University (OSU) is one of the largest-scale data rescue efforts in …
A Decade of High-resolution Ocean Bottom Pressure Measurements in the Northeast Pacific --- The NEPTUNE Observatory Tur…
Ocean Networks Canada (ONC; http://www.oceannetworks.ca/) operates the multidisciplinary NEPTUNE and VENUS cabled ocean observatories off the west coast of Canada and an increasin…
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