A. A. Borsa
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View article: Multiple modes of shoreline change along the Alaskan Beaufort Sea observed using ICESat-2 altimetry and satellite imagery
Multiple modes of shoreline change along the Alaskan Beaufort Sea observed using ICESat-2 altimetry and satellite imagery Open
Arctic shorelines are retreating rapidly due to declining sea ice cover, increasing temperatures, and increasing storm activity. Shoreline morphology may influence local retreat rates, but quantifying this relationship requires repeat esti…
View article: Geodetic Insights into Water Resources and Drought Dynamics in the Western United States
Geodetic Insights into Water Resources and Drought Dynamics in the Western United States Open
Developing a comprehensive understanding of global water resources – and their responses to extreme events and variations in climate – requires integrating diverse modeling and observational approaches across disciplines, with …
View article: The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges
The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges Open
Increasing climatic and human pressures are changing the world's water resources and hydrological processes at unprecedented rates. Understanding these changes requires comprehensive monitoring of water resources. Hydrogeodesy, the science…
View article: The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges
The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges Open
Increasing climatic and human pressures are changing the world's water resources and hydrological processes at unprecedented rates. Understanding these changes requires comprehensive monitoring of water resources. Hydrogeodesy, the science…
View article: Extreme Winter Precipitation Drives Recharge of Deep Mountain Groundwater
Extreme Winter Precipitation Drives Recharge of Deep Mountain Groundwater Open
Persistent declines in groundwater storage observed in mountainous regions of the western US over the past two decades are expected to continue, driven by increasingly variable winter temperatures and snowpack accumulation (Carroll et al.,…
View article: The Big Soak Part 2:California's Big 2023 Storms Replenish Groundwater in California's Central Valley
The Big Soak Part 2:California's Big 2023 Storms Replenish Groundwater in California's Central Valley Open
GPS measurements of solid Earth's displacements are bringing a better understanding of the water cycle in the Pacific Mountain system of the western U.S.in particular on how water processes transfer water between storage reservoirs through…
View article: Multiple modes of shoreline change along the Alaskan Beaufort Sea observed using ICESat-2 altimetry and satellite imagery
Multiple modes of shoreline change along the Alaskan Beaufort Sea observed using ICESat-2 altimetry and satellite imagery Open
Arctic shorelines are retreating rapidly due to declining sea ice cover, increasing temperatures, and increasing storm activity. Shoreline morphology may influence local retreat rates, but quantifying this relationship requires repeat esti…
View article: The NASA ISRO SAR (NISAR) Mission - Validation of Science Measurement Requirements
The NASA ISRO SAR (NISAR) Mission - Validation of Science Measurement Requirements Open
The NASA ISRO Synthetic Aperture Radar (NISAR) is scheduled for launch early in 2024 from the Satish Dhawan Space Centre (SDSC), at Sriharikota, near Chennai, India. This mission is the result of a collaboration between NASA and Indian Spa…
View article: GNSS Geodesy Quantifies Water‐Storage Gains and Drought Improvements in California Spurred by Atmospheric Rivers
GNSS Geodesy Quantifies Water‐Storage Gains and Drought Improvements in California Spurred by Atmospheric Rivers Open
Atmospheric rivers (ARs) deliver significant and essential precipitation to the western United States (US) with consequential interannual variability. The intensity and frequency of ARs strongly influence reservoir levels, mountain snowpac…
View article: Elastic deformation as a tool to investigate watershed storage connectivity
Elastic deformation as a tool to investigate watershed storage connectivity Open
Storage-discharge relationships and dynamic changes in storage connectivity remain key unknowns in understanding and predicting watershed behavior. In this study, we use Global Positioning System measurements of load-induced Earth surface …
View article: The Potential of Hydrogeodesy to Address Water-related Problems and Sustainability Challenges
The Potential of Hydrogeodesy to Address Water-related Problems and Sustainability Challenges Open
Increasing climatic and human pressures are changing the world's water resources and hydrological processes at unprecedented rates.These changes require monitoring water resources from ground and space at different temporal and spatial sca…
View article: High‐Density Integrated GNSS and Hydrologic Monitoring Network for Short‐Scale Hydrogeodesy in High Mountain Watersheds
High‐Density Integrated GNSS and Hydrologic Monitoring Network for Short‐Scale Hydrogeodesy in High Mountain Watersheds Open
We installed a purpose‐built network of co‐located Global Navigation Satellite System (GNSS) stations and meteorological instrumentation to investigate water storage in a high‐mountain watershed along the Idaho‐Montana border. Twelve GNSS …
View article: Empirical GNSS-derived terrestrial water storage-streamflow relationship in the Sierra Nevada ranges, California
Empirical GNSS-derived terrestrial water storage-streamflow relationship in the Sierra Nevada ranges, California Open
One of the most dynamic components of Earth surface mass variability is the constant global redistribution of terrestrial water storage (TWS) across temporal scales of hours to decades. Mass loading and unloading from TWS changes induce in…
View article: Subsurface Water Flux in California's Central Valley and Its Source Watershed From Space Geodesy
Subsurface Water Flux in California's Central Valley and Its Source Watershed From Space Geodesy Open
We integrate Global Positioning System displacements, Gravity Recovery and Climate Experiment gravity data, reservoir water volumes, and snowpack to estimate change in subsurface water in California. We find 29% of precipitation infiltrate…
View article: A Review of GNSS/GPS in Hydrogeodesy: Hydrologic Loading Applications and Their Implications for Water Resource Research
A Review of GNSS/GPS in Hydrogeodesy: Hydrologic Loading Applications and Their Implications for Water Resource Research Open
Hydrogeodesy, a relatively new field within the earth sciences, is the analysis of the distribution and movement of terrestrial water at Earth's surface using measurements of Earth's shape, orientation, and gravitational field. In this pap…
View article: Intensifying hydrologic drought in California
Intensifying hydrologic drought in California Open
<p>Drought has struck the southwest U.S. for the fourth time this millennium, reducing freshwater available to agriculture and urban centers.&#160; We are bringing new insight by quantifying change in water in the ground using GP…
View article: Quantifying Surface‐Height Change Over a Periglacial Environment With ICESat‐2 Laser Altimetry
Quantifying Surface‐Height Change Over a Periglacial Environment With ICESat‐2 Laser Altimetry Open
We use Ice, Cloud, and land Elevation Satellite 2 (ICESat‐2) laser altimetry crossovers and repeat tracks collected over the North Slope of Alaska to estimate ground surface‐height change due to the seasonal freezing and thawing of the act…
View article: Characterization of Groundwater Recharge and Flow in California's San Joaquin Valley From InSAR‐Observed Surface Deformation
Characterization of Groundwater Recharge and Flow in California's San Joaquin Valley From InSAR‐Observed Surface Deformation Open
Surface deformation in California's Central Valley (CV) has long been linked to changes in groundwater storage. Recent advances in remote sensing have enabled the mapping of CV deformation and associated changes in groundwater resources at…
View article: Estimating water change at Earth's surface using GRACE gravity and GPS positioning: Inferring groundwater change in the United States
Estimating water change at Earth's surface using GRACE gravity and GPS positioning: Inferring groundwater change in the United States Open
<p>We estimate change in total water and its components each month from January 2006 to the Present using geodetic observations from space and complementary hydrologic measurements.&#160; Estimates of changes in total water infer…
View article: Tracking the storage and dissipation of atmospheric river storm water in the Russian River watershed using GPS elastic displacements
Tracking the storage and dissipation of atmospheric river storm water in the Russian River watershed using GPS elastic displacements Open
<p>GPS is emerging as an effective technique to estimate changes in total water storage at Earth's surface.&#160; In California's mountains, GPS indicates that more subsurface storage is lost during drought and gained during year…
View article: An Assessment of Global Positioning System Velocity Uncertainty in California
An Assessment of Global Positioning System Velocity Uncertainty in California Open
We analyze data from 580 continuous global positioning system (GPS) stations in California to quantify differences in published velocity estimates from five analysis centers. Horizontal and vertical rates for individual stations can differ…
View article: Empirical GPS velocity uncertainty in California
Empirical GPS velocity uncertainty in California Open
Published velocity values compiled in to a composite velocity data set that contains the station name, longitude, latitude, and north/east/up velocity with empirical uncertainty. The interpolated vertical velocity field with uncertainty in…
View article: Quantifying Permafrost Deformation with ICESat-2
Quantifying Permafrost Deformation with ICESat-2 Open
We use ICESat-2 laser altimetry crossovers and repeat tracks collected over the North Slope of Alaska to estimate elevation changes due to the deformation of seasonally freezing and thawing permafrost. We compare these measurements with a …
View article: CONUS crustal vertical velocities 2007-2017
CONUS crustal vertical velocities 2007-2017 Open
This dataset includes vertical velocity fields derived from Global Positioning System (GPS) daily positions from 2007-2017, in the IGS08 reference frame. Residual velocities after removing glacial isostatic adjustment model (ICE6GD), elast…
View article: CONUS crustal vertical velocities 2007-2017
CONUS crustal vertical velocities 2007-2017 Open
This dataset includes vertical velocity fields derived from Global Positioning System (GPS) daily positions from 2007-2017, in the IGS08 reference frame. Residual velocities after removing glacial isostatic adjustment model (ICE6GD), elast…
View article: Fine-scale spatiotemporal variation in subsidence across California’s San Joaquin Valley explained by groundwater demand
Fine-scale spatiotemporal variation in subsidence across California’s San Joaquin Valley explained by groundwater demand Open
Achieving sustainable agricultural groundwater use remains a significant challenge worldwide in part because data on groundwater withdrawals are limited. A new generation of interferometric synthetic aperture radar (InSAR) data provide hig…
View article: An assessment of GPS velocity uncertainty in California
An assessment of GPS velocity uncertainty in California Open
We analyze 580 continuous GPS stations in California from 5 analysis centers to quantify the uncertainty in published velocities and develop a composite velocity for each station. The horizontal positions are similar but the reported veloc…