A5083113919- Cryospheric studies and observations
- Climate change and permafrost
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Soil Moisture and Remote Sensing
- Seismic Waves and Analysis
- Interprofessional Education and Collaboration
- Mobile Crowdsensing and Crowdsourcing
- Material Properties and Applications
- Methane Hydrates and Related Phenomena
- Families in Therapy and Culture
- Material Science and Thermodynamics
- Spam and Phishing Detection
- Privacy, Security, and Data Protection
University of Calgary
2014-2022
Islamic Azad University Kerman
2014
Abstract. Perennial snow, or firn, covers 80 % of the Greenland ice sheet and has capacity to retain surface meltwater, influencing mass balance contribution sea-level rise. Multilayer firn models are traditionally used simulate processes estimate meltwater retention. We present, intercompare evaluate outputs from nine at four sites that represent sheet's dry percolation, slab aquifer areas. The forced by energy fluxes derived automatic weather stations compared density, temperature...
Surface meltwater can be retained in an ice sheet if it infiltrates the firn and refreezes. This is important mass balance process for Greenland Ice Sheet, reducing runoff associated sea-level rise. The processes of infiltration refreezing are not fully understood, however, remain difficult to monitor remotely. We deployed vertical arrays thermistors time-domain reflectometry (TDR) probes 4-m depth continuously at DYE-2, Greenland. observations provide a detailed picture coupled thermal...
Abstract Meltwater retention in the firn layer of Greenland Ice Sheet has potential to buffer sea level rise due ice sheet melt. The capacity store meltwater is unclear, however, because refrozen layers can act as impermeable barriers percolation, promoting runoff rather than retention. We present time domain reflectometry and thermistor data, which demonstrate that successfully penetrates up 12 cm thick near‐surface at DYE‐2, Greenland. Our observations indicate within polar be permeable...
Abstract For understanding englacial hydrology and its impact on ice sheet mass balance, observations of the liquid water content (LWC) within sheets are needed. We combined 1.4–10.7 GHz passive microwave measurements with traditional 18.7–36.5 to detect subsurface LWC. In situ from DYE‐2 experiment site in Greenland a modeled LWC at this were used calibrate validate method. Our analysis showed sensitivity lower frequencies surface layers down least 2 m, enabling detection seasonal...
Meltwater refreezing and storage in the supraglacial snowpack can reduce delay meltwater runoff from glaciers. These are well-established processes polar environments, but importance of efficiency drainage uncertain on temperate alpine To examine these quantify their a mid-latitude mountain glacier, we measured temperature content upper 50 cm Haig Glacier Canadian Rocky Mountains. Thermistors TDR probes were installed at 10-cm intervals two sites glacier accumulation area May to September,...
Workers in online crowd sourcing systems have different levels of expertise, trustworthiness, incentives and motivations. Therefore, recruiting sufficient number well-suited workers is always a challenge. Existing methods usually recruit through open calls, friendships relations, matching their profiles with task requirements or teams workers. But there are still challenges that need more investigations, mainly all existing recruitment highly vulnerable to collaborating misbehaviour, i.e.,...
Abstract. Perennial snow, or firn, covers 80 % of the Greenland ice sheet and has capacity to retain part surface meltwater, buffering sheet’s contribution sea level. Multi-layer firn models are traditionally used simulate processes estimate meltwater retention. We present output from nine models, forced by weather-station-derived mass energy fluxes at four sites representative dry percolation, slab aquifer areas. compare model outputs evaluate them against in situ observations. Models that...
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)...
<p>Mass loss from the Greenland Ice Sheet has increased in recent decades due to significant increases surface melt and runoff. The fraction of summer retains as a liquid water or refreezes it percolates into underlying cold firn, acting buffer summer runoff. There are challenges quantifying both infiltration refreezing meltwater this complex heterogeneous firn understand spatial variability these processes. In study we present continuous situ measurements...
Meltwater retention in the firn layer of Greenland Ice Sheet is has potential to buffer sea level rise due ice sheet melt. The capacity store meltwater unclear, however, because refrozen layers can act as impermeable barriers percolation, promoting runoff rather than retention. We present time-domain reflectometry and thermistor data which demonstrates that successfully penetrates up 12 cm thick near-surface at Dye2, Greenland. Our observations indicate within polar become permeable when...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at AGU Advances. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing an older version [v1]Go new versionMeltwater Penetration Through Temperate Ice Layers in the Percolation Zone of Greenland SheetAuthors Shawn J. Marshall iD Samira Samimi Michael MacFerrin iDSee all authors...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Surface. 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]Time-Domain Reflectometry Measurements Modelling Firn Meltwater Infiltration DYE-2, GreenlandAuthorsSamiraSamimiShawn...