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Showing 7801 to 7850 of 59105 works
Multi-sensor approach for high space and time resolution land surface temperature
Surface-atmosphere fluxes and their drivers vary across space and time. A growing area of interest is in downscaling, localizing, and/or resolving sub-grid scale energy, water, an…
Improving and testing in-stream phosphorus cycling in SWAT+
Hydrologic and water quality models are often used to understand and simulate non-point source nutrient inputs to receiving waterbodies afflicted by eutrophication. The most widel…
Sub-city scale hourly air quality forecasting by combining models, satellite observations, and ground measurements
While multiple information sources exist concerning surface-level air pollution, no individual source simultaneously provides large-scale spatial coverage, fine spatial and tempor…
Phase-resolved wave boundary layer dynamics in a shallow estuary
We present in situ observations of near‐bed velocity profiles with high temporal and spatial resolution from a Nortek Vectrino Profiler deployed in South San Francisco Bay. Using …
Hydrothermal cooling as a requirement for short storage of silicic magmas
Large (150 km 3 ) magma bodies that contribute to caldera-forming eruptions in the Taupo Volcanic Zone, New Zealand have shown evidence for crystallization and storage on the orde…
ENTICE Satellite Orbital Simulator to Study Ice Clouds
Clouds play a significant role in the Earth’s energy balance and hydrological cycle through their effects on radiation and precipitation, and therefore are crucial for life on Ear…
Improved determination of Europa's long-wavelength topography using stellar occultations
Europa Clipper will arrive at Jupiter at the end of this decade and will explore Europa through a series of flybys. One of its many goals is to characterize Europa’s topography an…
Mycorrhizal distributions impact global patterns of carbon and nutrient cycling
Most tree species predominantly associate with a single type of mycorrhizal fungi, which can differentially affect plant nutrient acquisition and biogeochemical cycling. Here, we …
The conductive cooling of planetesimals with temperature-dependent properties
Modelling the planetary heat transport of small bodies in the early Solar System allows us to understand the geological context of meteorite samples. Conductive cooling in planete…
Assessment of ICESat-2 ATL08 Canopy Height Estimates for Tropical Forests in the Americas
A secondary mission objective of NASA’s Ice, Cloud and Land Elevation Satellite-2 (ICESat-2) is to derive vegetation heights that can be used to refine estimates of above-ground b…
Meta-analysis of Cryogenian through modern quartz microtextures reveals sediment transport histories
Quantitative scanning electron microscopy (SEM) quartz microtextural analysis can reveal the transport histories of modern and ancient sediments. However, because workers identify…
On optimum solar wind - magnetosphere coupling functions for transpolar voltage and planetary geomagnetic activity
Using 65,133 hourly averages of transpolar voltage Φ(PC) from observations made over 25 years by the SuperDARN radars, with simultaneous SML and interpolated am geomagnetic indice…
Shallow slow slip events can nucleate on velocity-strengthening thrust faults
Recent observations of faults in the shallow regions of subduction zones have revealed slow slip events that nucleate up-dip of the locked zone. Clay-rich sediments are prevalent …
A Lagrangian perspective on stable water isotopes during the West African Monsoon
We present a Lagrangian framework for identifying mechanisms that control the isotopic composition of mid-tropospheric water vapor in the Sahel region during the West African Mons…
Capacity building in EO and GIT - bridging the gender and capacity gap in the HKH region
Earth observation (EO) and geographic information technology (GIT) offer a wide range of data and tools to aid in data management, research, decision-making, and tracking, as well…
First results from the retrieved column O/N2 ratio from the Ionospheric Connection Explorer (ICON): Longitudinal struct…
In near-Earth space, variations in thermospheric composition have important implications for thermosphere-ionosphere coupling. The ratio of O to N 2 is often measured using far-UV…
The Ability of CMIP6 Models to Simulate 34-years of precipitation over the Brazilian Amazon
The Brazilian Amazon provides important hydrological cycle functions, including precipitation regimes that bring water tothe people and environment and are critical to moisture re…
Influence of dust on precipitation during landfalling atmospheric rivers in an idealized framework
Atmospheric rivers can provide as much as 50% of the total annual rainfall to the U.S. West Coast via orographic precipitation. Dust is thought to enhance orographic precipitation…
Using a Novel One Health Multi-Dimensional Matrix Tool to Examine Complex GeoHealth Challenges Relating to Food Safety …
The One Health concept provides a framework to examine the linkages between human, animal, plant, environmental, and ecosystem health. This framework can be represented as a multi…
Modeling Habitat Quality in the Choctawhatchee River and Bay Watershed
Human activity increases as population increases. The environment must be altered in response to the pressures increasing population creates. Altering the environment may pose a r…
Volcanic SO2 height retrieval from UV satellite measurements
Determining the height of a volcanic SO2 cloud after a volcanic eruption is a challenging task in UV satellite retrievals. The height is nevertheless the most important yet uncert…
Updated aerosol optical properties for the Goddard Earth Observing System (GEOS) Earth system model
The Goddard Earth Observing System (GEOS) global atmospheric model tracks and transports several individual aerosol species. A key contribution by these aerosols is to interact wi…
Nitrate transport and retention in Western European catchments are shaped by hydroclimate and subsurface properties
Excess nitrogen (N) from anthropogenic sources deteriorates freshwater resources. Actions taken to reduce N inputs to the biosphere often show no or only delayed effects in receiv…
Seismic structure of the St. Paul Fracture Zone and Late Cretaceous to Mid Eocene oceanic crust in the equatorial Atlan…
Plate tectonics characterize transform faults as conservative plate boundaries where the lithosphere is neither created nor destroyed. In the Atlantic, both transform faults and t…
Regional-scale, sector-specific evaluation of global CO2 inversion models using aircraft data from the ACT-America proj…
We use 148 airborne vertical profiles of CO2 for frontal cases from the summer 2016 Atmospheric Carbon and Transport-America (ACT-America) campaign to evaluate the skill of ten gl…
Constraining Southern Ocean CO2 Flux Uncertainty Using Uncrewed Surface Vehicle Observations
Remote, harsh conditions of the Southern Ocean challenge our ability to observe the region’s influence on the climate system. Southern Ocean air-sea CO2 flux estimates have signif…
Localized anisotropy in the mantle transition zone due to flow through slab gaps
Measurement of anisotropy advances our understanding of mantle dynamics by linking remote seismic observations to local deformation state through constraints from mineral physics.…
From slab to surface: Earthquake evidence for fluid migration at Uturuncu volcano
Uturuncu volcano is situated in the Bolivian Andes, directly above the world’s largest crustal body of silicic partial melt, the Altiplano-Puna Magma Body (APMB). Uturuncu last er…
Counteracting global warming by using a locally optimized solar radiation management
Solar Radiation Management (SRM) is regarded as a tool to potentially counteract global warming by increasing planetary albedo. Even though it has shown effective results in offse…
Unsupervised Deep Clustering of Seismic Data: Monitoring the Ross Ice Shelf, Antarctica
Advances in machine learning (ML) techniques and computational capacity have yielded state-of-the-art methodologies for processing, sorting, and analyzing large seismic data sets.…
Crustal deformation using GPS and InSAR analysis at Taupo volcano, New Zealand
Taupo Volcano, located in the central part of the TVZ (Taupo volcanic Zone), North Island of New Zealand, is one of the most productive Rhyolitic centres in the world. Although it…
A pointwise conservative method for thermochemical convection under the compressible anelastic liquid approximation
In prior work we found that precise approximation of the continuity constraint is crucial for accurate propagation of tracer data when advected through a background incompressible…
“Computational Correlational Studies of Tropical Cyclone Energetic with Dynamical Fluid Motions and Physical features o…
The efforts are to test, evaluate, and improve predictions of Tropical Cyclone’s track, intensity, speed, and inner core Structure, beyond 5 days, through the study of Tropical Cy…
Electromagnetic (EM) Implications of Australasian Tektite Morphology
Fragment-form Indochinite Australasian tektites show clear indications of electromagnetic involvement in their formative process. High-voltage, high-current arcing can cause effec…
Characteristics of the Effective Scale Height in the Topside Ionosphere Extracted from Swarm A and Digisonde Observatio…
The ionospheric scale height is a key parameter that defines the shape of the electron density profile. Its main characteristic, including the diurnal variation and its altitudina…
Native H2 exploration in the western Pyrenean foothills
Native hydrogen (H2) may represent a new carbon free energy resource, but to date there is no specific exploration guide to target H2-fertile geological settings. Here, we present…
COVID-19 Induced Fingerprints of a New Normal Urban Air Quality in the United States
Most countries around the world including the United States took actions to control COVID-19 spread that lead to an abrupt shift in human activity. On-road NOx emissions from ligh…
Variability of Jupiter's main auroral emission and satellite footprints observed with HST during the Galileo era
Hubble Space Telescope images of Jupiter’s UV aurora show that the main emission occasionally contracts or expands, shifting toward or away from the magnetic pole by several degre…
Three-dimensional Overturning Circulation Generated by Topography in the Southern Ocean and Its Implications
The Southern Ocean plays a major role in the global air-sea carbon fluxes, with some estimates suggesting it takes up 40% of the total anthropogenic carbon dioxide. Understanding …
Monsoon-driven biogeochemical dynamics in an equatorial shelf sea: time-series observations in the Singapore Strait
Coastal tropical waters are experiencing rapid increases in anthropogenic pressures, yet coastal biogeochemical dynamics in the tropics are poorly studied. We present a multi-year…
Reframing the Australasian Tektite Source Mystery
NASA hall of fame researcher Dean R. Chapman successfully calibrated the Apollo lunar mission heat shield design using Australasian tektite testing, then failed to apply the requi…
Foreshock Activity Promoted by Locally Elevated Loading Rate on a 4-meter-long Laboratory Fault
We report laboratory experimental results to reveal the factors that control the occurrence and magnitude of foreshocks. We conducted rock friction experiments using an apparatus …
Detecting and Characterizing Sea Ice Pressure Ridges with ICESat-2
Since its launch, in September 2018, ICESat-2’s Advanced Topographic Laser Altimeter System (ATLAS) has collected high-resolution measurements of Arctic sea ice by sampling the su…
Formation and exhumation of ultra-high pressure rocks through delamination and mantle upwelling: Evidence from seismic …
The Qinling-Dabie Orogenic Belt (QDOB) in Central China was built through prolonged subduction-accretion collision events and incorporates many exposures of exhumed ultrahigh-pres…
Unsupervised learning tracks spatiotemporal evolution of hydraulic fractures
Enhanced geothermal systems can provide a substantial share of the global energy demand if certain hurdles are overcome. One such hurdle is the accurate imaging of the fracture ne…
Effects of the COVID-19 Pandemic on Authors and Reviewers of American Geophysical Union Journals
The COVID-19 pandemic affected the scientific workforce in many ways. Many worried that stay-at-home orders would disproportionately harm the productivity and well-being of women …
Deep learning to evaluate US NOx emissions using surface ozone predictions
Emissions of nitrogen oxides (NOx = NO + NO2) in the United States have declined significantly during the past three decades. However, satellite observations since 2009 indicate t…
Thermal regime of Blake Ridge using seismic and borehole data
Constraining the subsurface thermal regime is of importance not just to the offshore hydrocarbon exploration industry but also for understanding the geothermal regime in context o…
Effect of lateral and temporal viscosity variations on GIA induced uplift rates in the Amundsen Sea Embayment
Accurate GIA models are required for correcting measurements of mass change in Antarctica and for improving our knowledge of the sub-surface, especially in areas of large current …
Large Scale Volcanism and the heat-death of terrestrial worlds
Large scale volcanism has played a critical role in the long-term habitability of Earth. Contrary to widely held belief, volcanism rather than impactors have had the greatest infl…
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