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Showing 12501 to 12550 of 22070 works
Towards determining the spatio-temporal variability of upper-ocean ecosystem stoichiometry from satellite remote sensing
The elemental stoichiometry of particulate organic carbon (C), nitrogen (N), and phosphorus (P) connects the C fluxes of biological production to the availability of the limiting …
COVID-19 national lockdown in Morocco: impacts on air quality and public health
On the 20th April 2020, the end of the first strict lockdown in Morocco, 2403410 cases of the corona Virus were confirmed globally. The number of Morocco confirmed cases attended …
CMIP6 without the interpolation: Grid-native analysis with Pangeo in the cloud
The Pangeo project recently introduced large parts of the CMIP6 data archive into the cloud. This enables, for the first time, centralized, reproducible science of state-of-the-ar…
Solving the Space Weather Problem: A 15+ Year Roadmap to Revolutionize Space Weather Research, Protect NASA Space Asset…
We propose a ‘system-of-systems’—an integrated web of SpWx stations and state-of-the-art modeling facilities to enable a transformative advance in Space Weather nowcasting and for…
Sigmoid generalized complementary equation for evaporation over wet surfaces: A nonlinear modification of the Priestley…
The deviations of the Priestley–Taylor (PT) coefficient from a fixed value around 1.26 indicate a nonlinear dependence of wet surface evaporation (E) on the equilibrium evaporatio…
Sensitivity of air-sea heat exchange in cold-air outbreaks to model resolution and sea-ice distribution
Modeling air-sea interactions during cold air outbreaks poses a major challenge because of the vast range of scales and physical processes involved. Using the Polar WRF model, we …
Ice-Nucleating Particle Concentrations and Sources in Rainwater over the Third Pole, Tibetan Plateau
The ice-nucleating particles (INPs) modulate the microphysics and radiative properties of clouds. However, less is known concerning their abundance and sources in the most pristin…
Dating the northwest shelf of Australia since the Pliocene
Accurate dating of marine sediments is essential to reconstruct past changes in oceanography and climate. Benthic foraminiferal oxygen isotope series from such sediments record lo…
Search for shallow subsurface structures in Chryse and Acidalia Planitiae on Mars
We surveyed the subsurface structure of Chryse and Acidalia Planitiae using data from the Mars SHAllow RADar sounder (SHARAD) onboard the Mars Reconnaissance Orbiter (MRO). Severa…
Regional differences of light absorption properties of fine particulate matter over the Tibetan Plateau: insights from …
Tibetan Plateau (TP) has aroused widely scientific concerns in recent decades owning to its important effects on regional climatic and cryospheric changes, hydrological cycle, and…
New Statistical Measures of Atmospheric Disequilibria and Implications for Detecting Life and Technology
Exoplanets exhibit properties suggestive of a diversity of worlds far exceeding that observed within our own solar system. This diversity, combined with limited data, poses challe…
Self-potential investigation of a deep-sea polymetallic sulfide deposit at the Southwest Indian Ridge (Indian Ocean)
Deep-sea polymetallic sulfides formed by hydrothermal activity are considered a potential resource for economically valuable base and precious metals. The Southwest Indian Ridge (…
Measured Constraints on Cloud-Top Entrainment to Reduce Uncertainty of Non-Precipitating Stratocumulus Shortwave Radiat…
Stratocumulus cloud-top entrainment has a significant effect on cloud properties, but there are few observations quantifying its impact. Using explicit 0D parcel model simulations…
Crustal Structures in the Coromandel Volcanic Zone and Hauraki Goldfield: Insight From Qualitative and Quantitative Pot…
The Hauraki Goldfield of the Coromandel Volcanic Zone (CVZ) is New Zealand’s premier region, hosting approximately 50 adularia-sericite epithermal Au-Ag deposits with northeast tr…
Impacts of Spatial Resolution on Remote Sensing Land Cover Classification and NDVI Estimates for Southern Baffin Island…
Accurate land cover classification of tundra is critical to modelling of future climate impacts in the Arctic. Existing classification systems (CAVM, NALCMS, GLC2000) are based on…
The Braiding Index 2.0: eBI
We present a new metric for braiding intensity to characterize multi-thread systems (e.g., braided and anastomosing rivers) called the Entropic Braiding Index, eBI. This metric is…
Van Allen Belt Punctures and their Correlation with Solar Wind, Geomagnetic Activity and ULF Waves
We investigate the rare events of sudden appearances of relativistic electrons (>700 keV), which are normally confined to the Van Allen belts, in the slot region. The frequency of…
A New Lake Sediment Record from North Yolla Bolly Lake (40° N) Reveals Multi-Scale Holocene Hydrologic Variability in N…
This study seeks to create a reconstruction of Holocene hydrologic variability of the Northern Coast Range of California using sediment cores collected from North Yolla Bolly Lake…
Glacial dust surpasses both volcanic ash and desert dust in its iron fertilization potential
The subarctic Pacific Ocean and Bering Sea comprise the second-largest high nitrate, low chlorophyll region in the world, where primary production is limited by the availability o…
Lidar observations and numerical simulations of an atmospheric hydraulic jump and mountain waves
An atmospheric hydraulic jump was observed over the Alaiz mountain range and Elorz valley near Pamplona, Spain from radial velocity retrievals performed with two scanning lidars d…
Study on the vorticity field within the tail reconnection jet by the MMS spacecraft
Based on direct measurement by the MMS spacecraft in the years of 2017 and 2018, we perform studies on the vorticity field () within the reconnection jet in the plasma sheet. A ty…
MANAGEMENT OF WATER SCARCITY IN ARID AREAS. Study case: Ziz watershed the way forward
The 2030 Agenda for Sustainable Development aims to reach 17 Sustainable Development Goals (SDGs). The 6th goal (SDGs (6) deals with water security, which refers mainly to water u…
Interhemispheric Comparisons of Structure and Variability of the Quasi-2-Day Wave at Middle and High Latitudes
Structure of the quasi-2-day wave (Q2DW) in the mesosphere and lower thermosphere (MLT) was compared between the northern and southern hemispheres, employing temperature and geopo…
Research on Amplitude and Polarization Characteristics of Array Ground Penetrating Radar in Three-dimensional Space
A conventional single dipole antenna will make the antenna power gain effect poor,and the energy of the effective excitation signal and scattering signal reflected from undergroun…
Relating the Start to the Terminator of Solar Cycle 25 and a Significant X-Flare Event
After analyzing the lowest adjusted 10.7cm solar flux values, we find that the adjusted flux for October 2019 is low enough to locate the start of Solar Cycle 25 between August 20…
Constraining the Densities of the Three Kepler-289 Planets with Transit Timing Variations
Kepler-289 is a three-planet system exhibiting Transit Timing Variations (TTVs). Kepler-289 contains two sub-Neptunes and one gas giant planet orbiting a young, Sun-like star whos…
Effects of saltwater infiltration on nested groundwater flow systems
Both shallow and deep groundwater flow mediates a variety of geologic processes. In the discharge zones of the nested groundwater flow systems, saltwater often emerges due to high…
Spatial and seasonal variations of stable isotope ratios of particulate organic carbon and nitrogen in the surface wate…
Stable isotope ratios of carbon and nitrogen (δ 13 C and δ 15 N) in the particulate organic matter (POM) of the euphotic layer were seasonally investigated in the vicinity of the …
Methane Measurements Using Portable Fourier Transform Spectrometers in the Greater Toronto Area
The Greater Toronto Area (GTA, pop. 6.4 million) is the populous city in Canada, thus accurately quantifying GHG emissions from the GTA is an important step towards meeting Canada…
Insights and Policy Implications from a Harmonized Earth Observation Approach to Urban Air Quality
Earth observation (EO) offers a promising and necessary approach to addressing environmental issues and sustainable development from the city to the global scale. The full potenti…
Bootstrap aggregation and cross-validation methods to reduce overfitting in reservoir policy search
Policy search methods provide a heuristic mapping between observations and decisions and have been widely used in reservoir control studies. However, recent studies have observed …
Automation of Ecological River Design: Opportunities and Challenges
Sustainable concepts of ecologically functional rivers challenge engineers, researchers, and planners. Advanced numerical modeling techniques produce nowadays high-precision terra…
A Revisit of Temporal and Spatial Variability and Resolution of Rainfall Measurements Relevant for Urban Hydrology
Localized and severe storms can cause citywide flooding, leading drainage systems to surcharge and overflow to nearby water courses. Urban catchments feature high degrees of imper…
Detection Sensitivity for the Gemini Planet Imager (GPI) to Potential Europa Plumes
There has been possible evidence from ground based telescopes for plumes of water emanating from Europa’s ice shell. Because of their potential connection to the subsurface ocean …
High-frequency global seismic wave modelling with realistic ocean layers and bathymetry
Oceans are known to have complex and nuanced effects on seismic wave propagation; changing the behaviour of phases which propagate in the solid Earth, supporting the propagation o…
A Revisit of Temporal and Spatial Variability and Resolution of Rainfall Measurements Relevant for Urban Hydrology
Localized and severe storms can cause citywide flooding, leading drainage systems to surcharge and overflow to nearby water courses. Urban catchments feature high degrees of imper…
Phase-field modeling of elastic-plastic fracture propagation in punch through shear test
Fracture initiation and propagation from a wellbore within a rock formation exhibit nonlinear and inelastic behaviors. When the rock material undergoes plastic deformation prior t…
Reappraisal of the climate impacts of ozone-depleting substances
We assess the effective radiative forcing due to ozone-depleting substances using models participating in the Aerosols and Chemistry Model Intercomparison Project (AerChemMIP). A …
Revealing the Dynamical Transition of Anisotropy behind the HOST by Koopman Analysis
The hockey-stick transition (HOST), which is depicted by the ‘local and global shear’ assumption, about the turbulence kinetic energy with the averaged flow intensity is noticed w…
Assessing Local Emission for Air Pollution via Data Experiments
Although air pollution is largely due to anthropogenic emission, the observed pollution levels in a city are confounded by meteorological conditions and regional transportation of…
Poroelasticity contributes to hydraulic-stimulation induced pressure changes
High-pressure fluid injections cause transient pore pressure changes over large distances, which may induce seismicity. The zone of influence for such an injection was studied at …
Uncertainties in the atmospheric loading to ice-sheet deposition for volcanic aerosols and implications for forcing rec…
Volcanic radiative forcing reconstruction is an important part of paleoclimate simulation and attribution efforts, and the conversion factor used to transfer ice core-based sulfat…
CT image‒based estimation of permeability evolution of wellbore cement under geologic carbon sequestration conditions
The combination of X-ray imaging and CT image‒based computational fluid dynamics (CFD) simulation allows study of flow in fractured porous media. In this study, X-ray imaging was …
Evaluation of High Mountain Asia -Land Data Assimilation System Part I: A hyper-resolution terrestrial modeling system
This first paper of the two-part series focuses on demonstrating the predictability of a hyper-resolution, offline terrestrial modeling system used for the High Mountain Asia (HMA…
The Southern Annular Mode in 6th Coupled Model Intercomparison Project models
We analyze trends in the Southern Annular Mode in CMIP6 simulations. For the period 1957-2014, simulated linear trends are generally consistent with two observational references b…
Intermodel CMIP5 relationships in the baseline Southern Ocean climate system and with future projections
Climate models exhibit a broad range in the simulated properties of the global climate. In the early historical period, the absolute global mean surface air temperature of models …
Mapping of Active Frazil in the Southern Ocean, with Improved Estimation of Sea-Ice Production
The predominance of active-frazil area and the high sea-ice production associated with it in Antarctic coastal polynyas have been increasingly recognized in recent in situ and hig…
Arctic Ocean Freshening Linked to Anthropogenic Climate Change: All Hands on Deck
Arctic Ocean freshwater storage increased since the mid 1990s, but the cause was unknown. Now a recent paper by Jahn & Laiho [2020, 2020GL088854] uses ensemble runs of a coupled c…
Random-walk Modeling of Reactive Transport in Porous Media With a Reduced-order Chemical Basis of Conservative Componen…
In this work we employ a reduced-order basis of conservative chemical components to model reactive transport using a Lagrangian (particle tracking) method. While this practice is …
Local Outreach with the UCLA Planetarium
The UCLA Planetarium hosts star shows and lectures on various astronomy topics, educating UCLA and the broader Los Angeles community about science and the wonders of the night sky…
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