A5009395539- Cryospheric studies and observations
- Climate change and permafrost
- Winter Sports Injuries and Performance
- Hydrology and Watershed Management Studies
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Flood Risk Assessment and Management
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Atmospheric aerosols and clouds
- Polar Research and Ecology
- Species Distribution and Climate Change
- Remote Sensing and LiDAR Applications
- Meteorological Phenomena and Simulations
- Reservoir Engineering and Simulation Methods
- Smart Materials for Construction
- Computational Physics and Python Applications
- Geological Studies and Exploration
- 3D Modeling in Geospatial Applications
- Distributed and Parallel Computing Systems
- Water-Energy-Food Nexus Studies
- Geographic Information Systems Studies
Pacific Northwest National Laboratory
2016-2025
University of California, Los Angeles
2016-2022
Oregon State University
2014-2016
Greenland’s snowline exhibits large fluctuations and is a primary amplifier of ice sheet surface melt runoff.
Significance Meltwater runoff is an important hydrological process operating on the Greenland ice sheet surface that rarely studied directly. By combining satellite and drone remote sensing with continuous field measurements of discharge in a large supraglacial river, we obtained 72 h observations suitable for comparison climate model predictions. The quantify how large, fluvial catchment attenuates magnitude timing delivered to its terminal moulin hence bed. data are used calibrate...
Record low snowpack conditions were observed at Snow Telemetry stations in the Cascades Mountains, USA during winters of 2014 and 2015. We tested hypothesis that these are analogs for temperature sensitivity snowpacks. In Oregon Cascades, 2015 winter air anomalies approximately +2 °C +4 above climatological mean. used a spatially distributed energy balance model to simulate multiple metrics warming compared our modeled sensitivities values found each +1 warming, basin-mean peak snow water...
Abstract Summer streamflow is an important water resource during the dry summers in western United States, but sensitivity of summer minimum (low flow) to antecedent winter precipitation as compared with evaporative demand has not been quantified for region. We estimate climatic elasticity low flow (percent change divided by percent forcing variable) respect annual maximum snow equivalent ( E SWE ), PPT and potential evapotranspiration PET ) 110 unmanaged headwater catchments maritime U.S....
Abstract. We document the density and hydrologic properties of bare, ablating ice in a mid-elevation (1215 m a.s.l.) supraglacial internally drained catchment Kangerlussuaq sector western Greenland sheet. find low-density (0.43–0.91 g cm−3, μ = 0.69 cm−3) to at least 1.1 depth below sheet surface. This near-surface, consists alternating layers water-saturated, porous clear solid lenses, overlain by thin (< 0.5 m), even lower (0.33–0.56 0.45 unsaturated weathering crust. Ice data from 10...
Abstract Permafrost underlies about one fifth of the global land area and affects ground stability, freshwater runoff, soil chemistry, surface‐atmosphere gas exchange. The depth thawed overlying permafrost (active layer thickness) has broadly increased across Arctic in recent decades, coincident with a period streamflow, especially lowest flows (baseflow). Mechanistic links between active thickness baseflow have recently been explored using linear reservoir theory, but most watersheds behave...
Measurements of albedo are a prerequisite for modelling surface melt across the Earth's cryosphere, yet available satellite products limited in spatial and/or temporal resolution. Here, we present practical methodology to obtain centimetre resolution with accuracies 5% using consumer-grade digital camera and unmanned aerial vehicle (UAV) technologies. Our method comprises workflow processing, correcting calibrating raw images white reference target, upward downward shortwave radiation...
Abstract Supraglacial lakes and rivers dominate the storage transport of meltwater on southwest Greenland Ice Sheet (GrIS) surface. Despite functioning as interconnected hydrologic networks, supraglacial are commonly studied independent features, resulting in an incomplete understanding their collective impact routing. We use Landsat 8 satellite imagery to assess seasonal evolution GrIS during 2015 melt season. Remotely sensed areas volumes compared with surface runoff simulations from three...
Abstract Surface melting impacts ice sheet sliding by supplying water to the bed, but subglacial processes driving accelerations are complex. We examine linkages between surface runoff, transient storage, and short‐term motion from 168 consecutive hourly measurements of meltwater discharge (moulin input) GPS‐derived for Rio Behar, a ∼60 km 2 moulin‐terminating supraglacial river catchment on southwest Greenland Ice Sheet. Short‐term in speed correlate strongly with lag‐corrected measures ( r...
Abstract River networks are important features in surface hydrology. However, accurately representing river spatially distributed hydrologic and Earth system models is often sensitive to the model's spatial resolution. Specifically, misrepresented because of mismatch between resolution network details, resulting significant uncertainty projected flow direction. In this study, we developed a topological relationship‐based representation method for models. This novel uses (a) graph theory...
The airborne AirSWOT instrument suite, consisting of an interferometric Ka-band synthetic aperture radar and color-infrared (CIR) camera, was deployed to northern North America in July August 2017 as part the NASA Arctic-Boreal Vulnerability Experiment (ABoVE). We present validated, open (i.e., vegetation-free) surface water masks produced from high-resolution (1 m), co-registered CIR imagery using a semi-automated, object-based classification. resulting are available open-access datasets...
Abstract. Light transmission into bare glacial ice affects surface energy balance, biophotochemistry, and light detection ranging (lidar) laser elevation measurements but has not previously been reported for the Greenland Ice Sheet. We present of spectral transmittance at 350–900 nm in collected a field site western ablation zone (67.15∘ N, 50.02∘ W). Empirical irradiance attenuation coefficients 350–750 are ∼ 0.9–8.0 m−1 12–124 cm depth. The absorption minimum is 390–397 nm, agreement with...
Abstract The production of meltwater from glacier ice, which is exposed at the margins land ice during summer, responsible for a large proportion mass loss. rate especially sensitive to its physical structure and chemical composition combine determine albedo ice. However, optical properties near-surface are not well known since most prior work has focused on laboratory-grown or deep cores. Here, we demonstrate measurement technique based diffuse propagation nanosecond-duration laser pulses...
Abstract River floods threaten life and economic stability, with risks increasing globally, especially in densely populated coastal areas. In mountainous watersheds like the Delaware Basin, rising temperature is projected to reduce snowpack, reshaping upstream–downstream flood dynamics. However, impact on synchronization between upland tributaries estuarine mainstems remains poorly understood. Using multidecadal streamflow simulations from a high-resolution hydrological model, we find...
Abstract. Discrete global grid systems (DGGS) are emerging spatial data structures widely used to organize geospatial datasets across scales. While DGGS have found applications in various scientific disciplines, including atmospheric science and ecology, their integration into physically based hydrological models Earth system (ESMs) has been hindered by the lack of flow routing on DGGS. In response this gap, study pioneers development new using icosahedral Snyder equal-area (ISEA) a novel...
Abstract Flow routing is a fundamental process of Earth System Models' (ESMs) river component. Traditional flow models rely on Cartesian rectangular meshes, which exhibit limitations, particularly when coupled with unstructured mesh‐based ocean components. They also lack the support for regionally refined models. While previous studies have highlighted potential benefits meshes routing, their widespread application and comprehensive evaluation within ESMs remain limited. This study extends...
Abstract. Large volumes of surface meltwater are routed through supraglacial internally drained catchments (IDCs) on the Greenland Ice Sheet each summer. Because routing impacts timing and discharge entering ice sheet moulins, accurately modeling moulin hydrographs is crucial for correctly coupling energy mass balance models with subglacial hydrology dynamics. Yet sheets remains a poorly understood physical process. We use high-resolution (0.5 m) satellite imagery derivative (3.0 digital...
Abstract. Greenland ice sheet surface runoff is drained through supraglacial stream networks. This evacuation influences mass balance as well dynamics. However, in situ observations of meltwater discharge these networks are rare. In this study, we present 46 discrete measurements and continuous water level for 62 d spanning the majority melt season (13 June to 13 August) 2016 a 0.6 km2 catchment southwest Greenland. The result an unprecedentedly long record that captures both diurnal...
Abstract AirSWOT is an experimental airborne Ka-band radar interferometer developed by NASA-JPL as a validation instrument for the forthcoming NASA Surface Water and Ocean Topography (SWOT) satellite mission. In 2017, was deployed part of Arctic Boreal Vulnerability Experiment (ABoVE) to map surface water elevations across Alaska western Canada. The result most extensive known collection near-nadir interferometric synthetic aperture (InSAR) data derivative high-resolution (3.6 m pixel)...
Abstract Flow direction modeling consists of (a) an accurate representation the river network and (b) digital elevation model (DEM) processing to preserve characteristics with hydrological significance. In part 1 our study, we presented a mesh‐independent approach representing networks on different types meshes. This follow‐up 2 study presents novel DEM for flow modeling. topological relationship‐based hybrid breaching‐filling method conduct stream burning modified depression removal rivers...
Abstract. Recent work has identified complex perennial supraglacial stream and river networks in areas of the Greenland Ice Sheet (GrIS) ablation zone. Current surface mass balance (SMB) models appear to overestimate meltwater runoff these compared in-channel measurements discharge. Here, we constrain SMB using hillslope routing model (HRR), a spatially explicit flow used terrestrial hydrology, 63 km2 catchment southwest Greenland. HRR conserves water momentum explicitly accounts for (i.e.,...
The presence of shadows in remotely sensed images can reduce the accuracy land surface classifications. Commonly used methods for removing often use multi-spectral image analysis techniques that perform poorly dark objects, complex geometric models, or shaded relief do not account cast on adjacent terrain. Here we present a new method topographic using readily available GIS software. corrects shadows, reduces amount over-correction, and be performed imagery any spectral resolution. We...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Water Resources Research. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Detecting permafrost active layer thickness change from nonlinear baseflow recessionAuthorsMatthew GCooperiDTianZhouiDKatrina E.BennettiDRobertBoltonEthanCoonSean WFlemingJoel...