A5081250078- Cryospheric studies and observations
- Climate change and permafrost
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Aerospace Engineering and Energy Systems
- Landslides and related hazards
Aberystwyth University
2012-2017
Abstract Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics, and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic water (AW) that rapidly melts undercuts marine‐terminating glaciers. Here we present new compilation Greenland assimilates seafloor thickness data through mass conservation approach. A 150 m horizontal resolution topography/bathymetric map constructed with seamless transitions at...
Bathymetry (seafloor depth), is a critical parameter providing the geospatial context for multitude of marine scientific studies. Since 1997, International Bathymetric Chart Arctic Ocean (IBCAO) has been authoritative source bathymetry Ocean. IBCAO merged its efforts with Nippon Foundation-GEBCO-Seabed 2030 Project, goal mapping all oceans by 2030. Here we present latest version (IBCAO Ver. 4.0), more than twice resolution (200 × 200 m versus 500 m) and individual depth soundings...
Abstract. Warm, subtropical-originating Atlantic water (AW) has been identified as a primary driver of mass loss across the marine sectors Greenland Ice Sheet (GrIS), yet specific processes by which this interacts with and erodes calving front tidewater glaciers is frequently modelled much speculated upon but remains largely unobserved. We present suite fjord salinity, temperature, turbidity versus depth casts along glacial runoff estimation from Rink Store glaciers, two major outlets...
Abstract Iceberg calving accounts for around half of all mass loss from both the Greenland and Antarctic ice sheets. The diverse nature its complex links to internal dynamics climate make it challenging incorporate into models glaciers Here we present results a new open‐source 3‐D full‐Stokes model developed in Elmer/Ice. implements crevasse depth criterion, which states that occurs when surface basal crevasses penetrate full thickness glacier. also rediscretization approach time‐evolution...
Abstract. We investigate the subglacial hydrology of Store Glacier in West Greenland, using open-source, full-Stokes model Elmer/Ice a novel 3D application that includes distributed water sheet, as well discrete channelised drainage, and 1D to simulate submarine plumes at calving front. At first, we produce baseline winter scenario with no surface meltwater. then hydrological system during summer, focussing specifically on 2012 2017, which provide examples high low surface-meltwater inputs,...
Humboldt Gletscher is a 100-km wide, slow-moving glacier in north Greenland which holds 19-cm global sea level equivalent. has been the fourth largest contributor to rise since 1972 but cause of its mass loss not elucidated. Multi-beam echo sounding data collected 2019 indicate seabed 200 m deeper than previously known. Conductivity temperature depth reveal presence warm water Atlantic origin at 0°C front and warming ocean waters by 0.9 ± 0.1°C 1962. Using an model, we reconstruct grounded...
Abstract The melting of glaciers by ocean waters along the ice sheet periphery is a major physical process driving glacier evolution in changing climate. Using fiber‐optic‐tethered Grounding line Remote Operated Vehicle, we explore shelf cavity Petermann Glacier, Northwestern Greenland, with an interferometric multibeam sonar operating 360 viewing capability. We detect uniform seafloor at 820 m depth, 200 deeper than anticipated. base reflects spatial variations melt no apparent signature...
Abstract Southeast Greenland has been a major participant in the ice sheet mass loss over last several decades. Interpreting evolution of glacier fronts requires information about their depth below sea level and ocean thermal forcing, which are incompletely known region. Here, we combine airborne gravity multibeam echo sounding data from National Aeronautics Space Administration's Oceans Melting (OMG) mission with probe fishing boat to reconstruct bathymetry extending margins edges...
Abstract. We investigate the subglacial hydrology of Store Glacier in West Greenland, using open-source, full-Stokes model Elmer/Ice a novel 3D application that includes distributed water sheet, as well discrete channelised drainage, and 1D to simulate submarine plumes at calving front. At first, we produce baseline winter scenario with no surface meltwater. then hydrological system during summer, focussing specifically on 2012 2017, which provide examples high low surface-meltwater inputs,...
Abstract The design of a prototype remote‐controlled glacier‐surveying robot, capable taking accurate above‐ and below‐water measurements calving glacier fronts, using swath bathymetry laser scanning hardware is presented. Data captured the remote control system during field trials on Lille Gletscher in western Greenland are informally compared with data same sensors from much larger manned vessel time period. potential use such device extended repeat survey missions discussed implications...
Abstract. Warm sub-polar mode water (SPMW) has been identified as a primary driver of mass loss marine terminating glaciers draining the Greenland Ice Sheet (GrIS) yet, specific mechanisms by which SPMW interacts with these tidewater termini remain uncertain. We present oceanographic data from Rink Glacier (RG) and Store (SG) fjords, two major outlets western sector GrIS into Baffin Bay over contrasting melt-seasons 2009 2010. Submarine melting occurs wherever ice is in direct contact warmer...
Storstrømmen and L. Bistrup Bræ are 20- 10-km wide, surge type glaciers in North Greenland quiescent phase that terminate the southernmost floating ice tongue East Greenland. Novel multi-beam echo sounding data collected August 2020 indicate a seabed at 350-400 m depth along relatively uniform shelf front, 100 deeper than expected, but surrounded by shallower terrain (<100 m) over 30-km wide region blocks access of warm, salty, subsurface Atlantic Intermediate Water (AIW) +1.6°C....
Abstract After three years of cold conditions, warm water has returned to Ilulissat Icefjord, home Jakobshavn Isbrae—Greenland’s largest outlet glacier. slowed and thickened since 2016, when waters near the glacier cooled from 3 °C 1.5 °C. Fjord temperatures remained through at least end 2019, but in March 2020, fjord warmed 2.8 As a result warming, we forecast that Isbrae will accelerate resume thinning during 2020 melt season. The fjord’s profound influence on behavior, connectivity...
&lt;p&gt;Tidewater glaciers are complex systems, which present numerous modelling challenges with regards to integrating a multitude of environmental processes spanning different timescales. At the same time, an accurate representation these systems in models is critical being able effectively predict evolution Greenland Ice Sheet and resulting sea-level rise. In this study, we results from numerical simulations Store Glacier West that couple ice flow modelled by Elmer/Ice subglacial...