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Showing 8251 to 8300 of 59105 works
Predicting thermal performance of an enhanced geothermal system from tracer tests in a data assimilation framework
Predicting the thermal performance of an enhanced geothermal system (EGS) requires a comprehensive characterization of the underlying fracture flow patterns from practically avail…
How are under ice phytoplankton related to sea ice in the Southern Ocean?
Little is known about Southern Ocean under-ice phytoplankton, despite their suspected potential-ice and stratification conditions permitting-to produce blooms. We use a distributi…
Mars in situ oxygen and propellant production by non-equilibrium plasmas
It has been recently advocated that Mars has excellent conditions for oxygen and fuel production directly from atmospheric CO2 using non-equilibrium plasmas. The Martian condition…
Trends in the Frozen Ground Temperature on the Tibetan Plateau Simulated by RegCM4.7-CLM4.5
The changing characteristics of the frozen ground (FG) are essential indicators of climate change. The soil temperature (ST) on the Tibetan Plateau (TP) during 1987- 2018 was simu…
Modelling economic decision-making under uncertainty: a comparison of 1 approaches
Modelling economic decision-making under uncertainty typically involves approaches that assume perfect foresight, or that future information is knowable and awaiting discovery (wh…
Science for rivers: communicating science behind the movement of rivers
In Peru, a group of scientists are investigating the main Amazonian rivers to understand all those physical variables that define their behavior and ecological importance througho…
Moving Towards L-Band NASA-ISRO SAR Mission (NISAR) Dense Time Series: Multi-Polarization Object-Based Wetland Classifi…
Given the key role, wetlands play in climate regulation and shoreline stabilization, identifying their spatial distribution is essential for the management, restoration, and prote…
Calculating an error correlation length scale from MFLL-OCO-2 column-average CO2 differences and using it to average OC…
To check the accuracy of column-average dry air CO2 mole fractions (“XCO2”) retrieved from Orbiting Carbon Overvatory (OCO-2) data, a similar quantity has been measured from the M…
The chemical continuous time random walk framework for upscaling fluid--solid reactions under advection--diffusion
The spatial distribution of reactants in heterogeneous media plays a central role in chemical reactions, which, as contact processes, depend on mixing. For fast reactions, diffusi…
Microseismicity around Orca submarine volcano, Bransfield Strait, Antarctica, during 2019-2020 from OBS data
Orca seamount is located in the Bransfield Strait, between the South Shetland Islands and the Antarctic Peninsula. The volcano developed on an extensional rift produced by a combi…
Seasonal and interannual variability of the Weddell Gyre from a high-resolution global ocean-sea ice simulation during …
The Weddell Gyre’s variability on seasonal and interannual timescales is investigated using an ocean-sea ice model at three different horizontal resolutions. The model is evaluate…
Stream-Aligned Magnetohydrodynamics for Solar Wind Simulations
We present a reduced magnetohydrodynamic (MHD) mathematical model describing the dynamical behavior of highly conducting plasmas with frozen-in magnetic fields, constrained by the…
Unsupervised Clustering of Argo Temperature and Salinity Profiles in the Mid-latitude Northwest Pacific Ocean and Revea…
In the mid-latitude Northwest Pacific Ocean, subtropical and subarctic waters meet, intermingle, and mix to form multiple ocean domains characterized by a variety of unique oceano…
Mantle structure and flow across the continent-ocean transition of the eastern North American margin: anisotropic S-wav…
Little has been seismically imaged through the lithosphere and mantle at rifted margins across the continent-ocean transition. A 2014-2015 community seismic experiment deployed br…
Classifying precipitation from GEO Satellite Observations: Diagnostic Model
Improvements in remote sensing capability and improvements in artificial intelligence have created significant opportunities to advance understanding of precipitation processes. W…
Structure estimation of 2D listric faults using quadratic Bezier curve for depth varying density distributions
A contemporary and decisive optimization algorithm is developed for inverting gravity anomalies due to listric faults. The cross-section of listric faults are generally concave up…
Data-driven modeling of atomic oxygen airglow over a period of three solar cycles
The Earth’s upper atmosphere is a dynamic environment that is continuously affected by space weather from above and atmospheric processes from below. An effective way to observe t…
Dynamic evolution of flow structures and viscosity during basaltic magma emplacement and crystallization in an upper-cr…
An upper-crustal intrusive network in the 201.5 Ma, rift-related Central Atlantic Magmatic Province is exposed in the western Newark basin (PA, USA). Alpha-MELTS modeling was used…
Nighttime magnetic perturbation events observed in Arctic Canada: 3. Occurrence and amplitude as functions of magnetic …
Rapid changes of magnetic fields associated with nighttime magnetic perturbation events (MPEs) with amplitudes |ΔB| of hundreds of nT and 5-10 min periods can induce geomagnetical…
The role of coupled feedbacks in the decadal variability of the SH eddy-driven jet
Recent work has suggested that tropical Pacific decadal variability and external forcings have had a comparable influence on the observed changes in the Southern Hemisphere (SH) s…
A Repeating Earthquake Catalog from 2003 to 2018 for the Raukumara Peninsula, Northern Hikurangi Subduction Margin, New…
Repeating earthquakes provide a novel way of monitoring how stresses load faults between large earthquakes. To date, however, and despite the availability of long-duration, high-q…
Underestimated MJO variability in CMIP6 models
The Madden-Julian Oscillation (MJO) is the leading mode of intra-seasonal climate variability, having profound impacts on a range of weather and climate phenomena. Here, we use a …
Role of agricultural land practices in the behaviour of nitrates in groundwater
Nitrate contamination is a major issue in aquifers that are being exploited for drinking water. Exceeding regulatory levels of nitrates in drinking water can cause acute and chron…
A model for oceanic melt rates under ice shelves using a balance-flux approach (CHICO)
A two-layer model of thermohaline ocean circulation under Antarctic ice shelves is described that predicts sub-oceanic ice-shelf melt rates given the basin geometries and ocean te…
Systematic Variations in Lava Flow Morphology Along the North and South Rift Zones of Axial Seamount
Meter-scale AUV mapping of 85-km of the summit and rift zones of Axial Seamount shows systematic variation in morphology of the lava flows with depth and distance from the caldera…
Impact of Human vs Natural Processes: Insights from the North Carolina Shelf following Hurricane Florence
Many communities along the East and Gulf coasts of the United States are experiencing moderate to severe erosion. Decadal shoreline erosion rates determined by the North Carolina …
Improved Low-Cost GNSS-R Altimetry by Recursive Temporal Continuity Constraints
Global Navigation Satellite System (GNSS) signals reflected at the water surface are received together with direct GNSS signals by two low-const receivers deployed to an unmanned …
Statistics and Forecasting of Aftershocks during the 2019 Ridgecrest, California, Earthquake Sequence
The 2019 Ridgecrest, California, earthquake sequence represents a complex pattern of seismicity that is characterized by the occurrence of a well defined foreshock sequence follow…
A Strategy to Improve the GOES-R Land Surface Temperature Product with All Weather Information in Near Real Time
LST is routinely retrieved from the GOES-R Advanced Baseline Imager (ABI) long wave spectral channels. Since the product is available only under clear sky conditions, large gaps e…
UVSQ-SAT a New Way to Obtain Spatio-temporal Variations of the Radiation Budget with a Satellite Constellation
Monitoring Earth Energy Imbalance (EEI) is absolutely fundamental to understand and prevent climate change as it corresponds to the Earth’s excess heat. In particular, measuring r…
Graph-partitioning based convolutional neural network for earthquake detection using a seismic array
We present a deep-learning approach for earthquake detection using waveforms from a seismic array consisting of multiple seismographs. Although automated, deep-learning earthquake…
Whistler instability driven by the sunward electron deficit in the solar wind: High-cadence Solar Orbiter observations
Solar wind electrons play an important role in the energy balance of the solar wind acceleration by carrying energy into interplanetary space in the form of electron heat flux. Th…
Analyzing, Visualizing, and Predicting the Impacts of Various Natural Disasters Through Geospatial Applications
Using population grid datasets, satellite imagery, and geospatial data accessed through Google Earth Engine, we identified patterns between natural disasters, their causes, and th…
Application of small area variance estimates of forest parameters using earth observation auxiliary variables and a k-N…
Combining auxiliary variables and ground data of forest parameters using the model-based approach has become a frequently used methodology to produce synthetic estimates for small…
Wide distribution and partial melting of eclogite indicated by the X-discontinuity in the upper mantle
Whether and where recycled oceanic crusts melt in the deep mantle are fundamentally important questions for understanding the evolution and dynamics of the Earth's mantle, and the…
Simultaneous pulsating aurora and microburst observations with ground-based fast auroral imagers and CubeSat FIREBIRD-II
We report on the relationship between pulsating aurora and relativistic electron microburst using simultaneous observations of ground-based fast auroral imagers with the FIREBIRD-…
Use of twenty years CLUSTER/FGM data to study the global behavior of the magnetic field and current density of Earth’s …
The data from the CLUSTER FGM magnetometer, recorded for 20 years at ESA’s Cluster Science Archive, as well as the position of the spacecraft, have been used to form a database al…
A new temporally flow-dependent EDA estimating background errors in the new Copernicus European Regional Re-Analysis (C…
A new augmented Ensemble of Data Assimilations (EDA) technique to estimate background error covariances (B-matrix) has been developed for the Copernicus European Regional Re-Analy…
Errors in Positioning of Borehole Measurements and How They Influence Seismic Inversion
Inversion of seismic data using information from horizontal wells is often is hampered by cumulative well- location errors. These errors can be significant and propagate to the we…
Detecting the presence of Tropical Cyclones using Deep Learning Techniques
Tropical cyclones are severe weather events which have massive human and economic effect, so it is important to be able to understand how their location, frequency and structure m…
Distribution and occurrence frequency of dB/dt spikes during magnetic storms 1980-2019
Geomagnetically induced currents or GICs are signatures of a rapidly time-varying magnetic field (dB/dt) and occur mainly during substorms and storms. When, where and why exactly …
Assessing the Impacts of Extreme Weather on Local-Scale Hazards in Urban Districts
Airflows over complex geometrical surfaces such as complex terrain and densely built urban districts are highly turbulent and sometimes become a threat under disturbed weather con…
Biogeosciences Perspectives on Integrated, Coordinated, Open, Networked (ICON) Science
This article is composed of three independent commentaries about the state of ICON principles (Goldman et al. 2021) in the AGU Biogeosciences section and discussion on the opportu…
Water Budgets and Droughts under Current and Future Conditions in the Congo River Basin
A multi-model hydrological assessment in the Congo Basin is performed to assess water availability conditions for historical and future periods (1913–2099). With models limited by…
Stress transfer in the western boundary of Bayan Har Block in Tibet Plateau from the 2008 to 2020 Yutian Earthquake seq…
Eight M≥7.0 earthquakes have occurred around Bayan Har block since 2000, resulting huge casualties and countless economic loss. Specifically, four M≥6.0 earthquakes occurred near …
Continuous CH₄ and δ¹³CH₄ Measurements in London Demonstrate Under-Reported Natural Gas Leakage
Assessment of bottom-up greenhouse gas emissions estimates through independent methods is needed to demonstrate whether reported values are accurate or if bottom-up methodologies …
Numerical Study of the Impacts of Increased Ductility on Hydraulic Fracturing in Organic-rich Shale
The research on increased ductility of organic-rich shale and its impacts on hydraulic fracturing has received relatively little attention. According to recent experimental studie…
Above or Below the Moho? Depth analysis of continental U.S. earthquakes using Sn/Lg ratio
The occurrence of earthquakes in the continental upper mantle is highly debated, and bears directly on lithospheric rheology (e.g. “jelly-sandwich” vs. “crème-brulée” models). Bec…
Earth and Space Science Collaboration During a Pandemic: An Analysis of AGU Journal Submissions and AGU Fall Meeting Ab…
The American Geophysical Union (AGU) has extensive journal submission and annual meeting abstract data that we can use to study effects within the Earth and space science (E&SS) c…
On the Formation of Phantom Electron Phase Space Density Peaks in Single Spacecraft Radiation Belt Data
This paper examines the rapid losses and acceleration of trapped relativistic and ultrarelativistic electron populations in the Van Allen radiation belt during the September 7-9, …
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