A5053475875- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Statistical and numerical algorithms
- Geological Studies and Exploration
- Tree-ring climate responses
- Geological Modeling and Analysis
- Plant Water Relations and Carbon Dynamics
- Hydrology and Drought Analysis
- Landslides and related hazards
- Marine and Coastal Research
- Traffic Prediction and Management Techniques
- Advanced Computational Techniques and Applications
- Wind and Air Flow Studies
- Historical Geography and Cartography
- Earthquake Detection and Analysis
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Flood Risk Assessment and Management
- Remote Sensing and Land Use
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Computational Physics and Python Applications
- Atmospheric and Environmental Gas Dynamics
NOAA National Geodetic Survey
2020-2024
National Oceanic and Atmospheric Administration
2020-2024
University of Nevada, Reno
2024
University of Arizona
2015-2020
Abstract The Santa Catalina‐Tortolita‐Rincon Mountains of Southeast Arizona are a classic metamorphic core complex (MCC) and represent footwall exposures crustal rocks exhumed by detachment system. This study presents new evidence for the formation majority ductile deformation during Eocene (~46 Ma), synchronous with emplacement regionally significant Wilderness Sills Suite (57–45 Ma). is provided U‐Pb ages syn‐ to late kinematic dikes emplaced in principal mylonitic fabric Catalina...
Abstract The geoid-quasigeoid separation (GQS) traditionally uses the Bouguer anomalies to approximate difference between mean gravity and normal along plumb line. This approximation is adequate in flat low elevation areas, but not high rugged mountains. To increase accuracy, higher order terms of corrections (potential gradient) were computed Colorado where 1 cm geoid computation experiment was conducted. Over an area 730 km by 560 ranges 932 4,385 m, potential correction (Pot. Corr.)...
Abstract Bathymetry data over lake areas are not included in the current and previous NGS (National Geodetic Survey) geoid models. Lake surfaces simply treated as land during modeling regardless of apparent density difference between water rock, resulting artificial masses that distort model from actual gravity field corresponding surface. In this study, compiled high-resolution bathymetry provided by National Centers for Environmental Information used to identify real volume bodies. Under...
Numerical methods like the Finite Element Methods (FEM) or (FVM) are widely used in many engineering applications to solve boundary value problems that hard find rigorous analytical solutions. These numerical have been also applied geodesy previous studies regardless of its huge computation demands. They arisen due fact upper condition was usually set up at satellite orbit level, hundreds kilometers above Earth. The relatively large distances between bottom Earth' s surface, and even...
With more continuous Global Navigation Satellite System (cGNSS) network stations becoming available around the world and with improved data processing techniques, it is possible to observe model subtle motions in Earth’s crust that were previously undetectable. Critical studying these understanding contributions of various signals mixed into cGNSS time-series, for example non-tidal atmospheric ocean loading (NTAOL) hydrologic loading. We investigate effect surface mass has on...
<div> <p>The U.S. National Geodetic Survey (NGS), an office of the Oceanic and Atmospheric Administration (NOAA), is preparing for release a new vertical datum, North American-Pacific Geopotential Datum 2022 (NAPGD2022). This datum will be based on high degree spherical harmonic model Earth’s gravitational potential, yield geoid undulation (GEOID2022) to calculate orthometric heights from GNSS-derived ellipsoid heights.</p>...
<p>Bathymetric data over lake areas are not included in previous NGS (National Geodetic Survey) geoid model computations. Mean surfaces used as the bare rock surface during modeling. This approximation treats water body rocks with same size, and causes errors that can be avoided. study uses bathymetric to rigorously compute volume of bodies instead treating them rocks, To make fair comparisons show effects clearly, three sets models generated theory currently at NGS,...
The U.S. National Geodetic Survey (NGS), an office of the Oceanic and Atmospheric Administration (NOAA), is preparing for release a new vertical datum, North American-Pacific Geopotential Datum 2022 (NAPGD2022). This datum will be based on high degree spherical harmonic model Earth’s gravitational potential, yield geoid undulation (GEOID2022) to calculate orthometric heights from GNSS-derived ellipsoid heights.A critical component this terrain that used computation. Currently,...
Abstract The Mediterranean region is projected to experience severe drying trends and more extreme hydroclimate events as a consequence of anthropogenic climate change over the next century. In some places this signal may have already emerged from natural variability. Here we provide context for recent future changes with new high-resolution (0.5$^o$) spatial reconstruction Palmer Drought Severity Index (PDSI) using tree-ring network that spans much last millennium. This provides information...
<p>The U.S. National Geodetic Survey (NGS), an office of the Oceanic and Atmospheric Administration (NOAA), will release a new vertical datum in 2022, North American-Pacific Geopotential Datum 2022 (NAPGD2022). This be based on high degree spherical harmonic model Earth’s gravitational potential, yield geoid undulation (GEOID2022) to calculate orthometric heights from GNSS-derived ellipsoid heights.</p><p>In preparation for datum, NGS...
<p>For the upcoming North American-Pacific Geopotential Datum of 2022, National Geodetic Survey (NGS), Canadian (CGS) and the National Institute Statistics Geography Mexico (INEGI) computed first joint experimental gravimetric geoid model (xGEOID) on 1’x1’ grids that covers a region bordered by latitude 0 to 85 degree, longitude 180 350 degree east. xGEOID20 models are using terrestrial gravity data, latest satellite...