A5050482527- Cryospheric studies and observations
- Polar Research and Ecology
- Winter Sports Injuries and Performance
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Hydrology and Watershed Management Studies
- Methane Hydrates and Related Phenomena
- Remote Sensing and LiDAR Applications
- Microbial Community Ecology and Physiology
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Water Resources and Management
- Aeolian processes and effects
- Outdoor and Experiential Education
- Water Quality and Resources Studies
- Urban Heat Island Mitigation
- Tree Root and Stability Studies
- Tree-ring climate responses
- Plant Ecology and Soil Science
- Plant Physiology and Cultivation Studies
- Remote Sensing in Agriculture
Rutgers, The State University of New Jersey
2017-2023
University of California, Davis
2015-2017
Abstract Refreezing of meltwater in firn is a major component Greenland ice-sheet's mass budget, but situ observations are rare. Here, we compare the density and total ice layer thickness upper 15 m 19 new 27 previously published cores drilled at locations southwest (1850–2360 a.s.l.) between 1989 2019. At all sites, covaries with over time space. two sites earliest (1989 1998), bulk increased by 15–18%, top 28 21 years, respectively. However, following extreme melt 2012, elevation-detrended...
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. 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...
Microbial mat growth can produce diagnostic delicate structures in low-energy environments, but morphology, and thus preservation of as morphological biosignatures, is affected by mud accumulation. In Lake Joyce, Antarctica, varying rates siliciclastic deposition the morphology partially calcified microbial mats. These mats were characterized along a shore-parallel transect from higher- to lower-sedimentation regions lake. Mats with high accumulation predominantly flat sparse pinnacles. At...
Abstract Melting on the Greenland Ice Sheet leads to extensive supraglacial stream networks. These streams accumulate low‐albedo sediments disproportionately contribute melting. Studies analyzing sediment distribution and hydrodynamic properties are rare. Here, we examine a 130‐m reach in southwest using drone imagery, bathymetry, hydrology measurements from 2017. Sediment covered 24% of channel had mass‐median diameter 0.027 mm. We applied calculations critical Shields stress determine...
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...
Every year, numerous field teams travel to remote locations on the Greenland ice sheet carry out polar research, geologic exploration, and other commercial, military, strategic, recreational activities. In this region, extreme weather can lead decreased productivity, equipment failure, increased stress, unexpected logistical challenges, and, in worst cases, a risk of physical injury loss life. Here we describe methods for calculating probability "scienceable" day defined as when wind,...
The increasing mass loss from the Greenland ice sheet is becoming growingly important to present-day global sea level rise. Meltwater export ocean may be amplified by near-surface layers in firn (i.e., snow that has survived at least one melt season) which prevent infiltration. Such have been documented various sites southwest Greenland, but little known about local-scale (less than 1 km) variability and properties. Here we investigate local density content (ice layer thickness fraction)...
Abstract. Light transmission into bare glacial ice affects surface energy balance, bio-photochemical cycling, and light detection ranging (LiDAR) laser elevation measurements but has not previously been reported for the Greenland Ice Sheet. We present in-ice solar irradiance measured over spectral range 350–900 nm 12–77 cm depth collected at a site in western ablation zone. The acquired are used to calculate flux attenuation coefficients using an exponential decay Bouguer law model compared...
Abstract. Greenland’s ice sheet mass loss rate has tripled since the mid-1950s in concert with sharply lowered albedo leading to increased absorption of solar radiation and enhanced surface melt. Snow melt driven by is presence light absorbing particles (LAPs), such as black carbon (BC) dust. Yet, LAP impact on poorly constrained, partly due scarce availability in-situ measurements. Here, we present a survey snow properties LAPs deposited winter layers at five sites southwest Greenland...
On the surface of Greenland Ice Sheet, presence low-albedo features greatly contributes to ablation zone meltwater production. Some lowest albedo on Sheet are water-filled supraglacial stream channels, especially those with abundant deposits consolidated cryoconite sediment. Because these sediments enhance melting by disproportionately lowering albedo, studying their spatial extent can provide a better understanding Greenland’s contribution global sea level rise. However, little is known...