A5032132566- Cryospheric studies and observations
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Polar Research and Ecology
- Landslides and related hazards
- Geological Studies and Exploration
- Planetary Science and Exploration
- Hydrology and Watershed Management Studies
- Isotope Analysis in Ecology
- Geographic Information Systems Studies
- Geological formations and processes
- Indigenous Studies and Ecology
- Global Energy and Sustainability Research
- Atmospheric and Environmental Gas Dynamics
- Geological Modeling and Analysis
- Geological Formations and Processes Exploration
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Spacecraft and Cryogenic Technologies
- Global Energy Security and Policy
- Coal and Coke Industries Research
- Marine and environmental studies
Geological Survey of Denmark and Greenland
1991-2023
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
1989
Continental (Canada)
1987
University of Copenhagen
1984
ABSTRACT Glacier surface mass-balance measurements on Greenland started more than a century ago, but no compilation exists of the observations from ablation area ice sheet and local glaciers. Such data could be used in evaluation modelled mass balance, or to document changes glacier melt independently model output. Here, we present comprehensive database The spans 123 1892 2015, contains total ~3000 46 sites, is openly accessible through PROMICE web portal ( http://www.promice.dk ). For each...
Abstract The interaction between sea ice and glaciers has been studied for the floating tongue of Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). Information from glacial geological studies, expedition reports, aerial photographs satellite imagery is used to document glacier front position fast-ice conditions on millennial decadal time-scales. studies indicate that stability margin dependent presence a protecting cover in glacier. In periods with permanent cover, no...
Calving of icebergs is the dominant ablation mechanism for large outlet glaciers from Greenland ice sheet except in northernmost where bottom melting floating dominates. This difference controlled by present climate conditions. Glacial geological evidence indicates that transition between associated types fjord‐glaciations moved north‐south response to past change. In cold periods, local melt‐out debris an increasing number reduces potential iceberg transport IRD. Thus, marine IRD signal...
A concentration process occurring in the melt zone of Greenland ice cap has produced richest known deposit cosmic dust on surface earth. Extraterrestrial particles collected from this region are well preserved and collectable large quantities. The generally identical to spheres found ocean floor, but a pure glass type was discovered that not been seen deep-sea samples. Iron-rich conspicuously rare material.
Abstract Investigations have been made of the geomorphology, internal structure, and till fabric small drumlins in a drumlin field exposed front retreating northern part Mýrdalsjökull, Iceland. The either comprise irregular complexes or they show clearly shape typical with their highest points at up-glacier ends streamlined hills. core each consists undisturbed glacio-fluvial deposits glacio-dynamically deformed drift. distribution first type often has characteristic en échelon arrangement,...
Abstract. Here, we present a compilation of 95 ice temperature profiles from 85 boreholes the Greenland sheet and peripheral caps, as well local caps in Canadian Arctic. Profiles only 31 (36 %) were previously available open-access data repositories. The remaining 54 borehole (64 are being made digitally here for first time. These newly profiles, which associated with pre-2010 boreholes, have been submitted by community members or digitized published graphics and/or tables. All now both...
Abstract Old ice for palaeoenvironmental studies retrieved by deep core drilling in the central regions of large sheets can also be from ice-sheet margins. δ 18 O content surface was studied at 15 different Greenland ice-margin locations. At some locations, two or more records were obtained along closely spaced parallel sampling profiles, showing good reproducibility records. We present reaching back to Pleistocene. Many characteristic variations known cores recognized, allowing an...
Abstract Nioghalvfjerdsfjorden glacier is a >60 km long and 20 wide floating outlet located at 79°30’ N, 22° W, draining large area of the northeast Greenland ice sheet. Climate, mass-balance dynamics studies were carried out on in three field seasons 1996, 1997 1998. As part this work, tidal-movement observations by simultaneous differential global positioning system (GPS) measurements several locations distributed surface. The GPS performed continuously over tidal cycles. At same time,...
Hot water drilling and mass-balance measurements were made on the Inland Ice at Pakitsoq north-east of Jakobshavn. Two arrays moderate shallow-depth thermistor strings have been installed in ice to map englacial temperature from margin equilibrium line. Water fluctuations observed a drill hole connecting bed. The indicate high subglacial pressure dose overburden pressure.
Glaciological research was initiated in 1996 on the floating glacier tongue filling Nioghalvfjerdsfjorden NorthEast Greenland (Fig. 1), with aim of acquiring a better understanding response ice sheet (Inland Ice) to changing climate, and implications for future sea level. The is part three year project (1996–98) advance into basic processes that contribute changes ocean volume climate. Five nations are participants project, which supported by European Community (EC) Environment Climate...
The Greenland ice sheet, the Inland Ice, covers about 1.7 million km2 whichi is 79% of Greenlands total area. Ice plays an important hydrological role, global as well local. About 7% world's fresh water stored here and largest rivers in originale from sheet.
Abstract Annual ice ablation has been measured at three locations the margin of Greenland sheet: Nordbogletscher (for 6 years: 1977–78 to 1982– 83), Qamanârssûp sermia (8 1979–80 1986–87) and Paakitsup Akuliarusersua (7 1982–83 present). As data sets cover different periods, it is difficult compare directly between sites. However, series each site can be extended over last 30 years (1961–90) by simulations using climatic data, compared. The pattern calculated variations remarkably similar...
Glaciological investigations have been carried out in areas proposed for local hydro-power stations Greenland, A mapping programme was set up, to provide data mass balance and simulation of run-off, as well glacier dynamics. Two types map produced, covering the margin Inland Ice: detailed photogrammetric maps, based on plotting from vertical aerial photographs a new type surface feature map, digitally-processed Landsat data. The plotted scale 1:25 000, include topography features, such...
The glaciology group at the Geological Survey of Denmark and Greenland (GEUS) has a tradition applied consulting for hydropower projects in (Weidick & Thomsen 1982; Braithwaite Olesen 1988; Ahlstrøm et al. 2008). This includes assessments plants now operating Ilulissat Nuuk (Braithwaite 1989; 1993), as well outburst potential ice-dammed lakes such Qorlortorsuup Tasia (Mayer Schuler 2005). Several factors, including long-term increases global resource demand, increasing air temperatures...
The main goals of the project were to investigate present and past climate glacier dynamics North Greenland by means ice-core records, ice margin studies, mass balance studies glacial geological on around Hans Tausen Iskappe.
Glaciological investigations were carried out on the Greenland ice sheet to help develop plans for a hydro-electric power station supply energy Ilulissat/Jakobshavn. The required research supraglacial and subglacial melt-water drainage in order delineate water-drainage basins. This involved repeated detailed photogrammetric mapping, radio echo-sounding, hot-water drilling, mathematical modelling of drainage. Repeated mappings combine show an overall stability pattern, while model...
Abstract Investigations have been made of the geomorphology, internal structure, and till fabric small drumlins in a drumlin field exposed front retreating northern part Mýrdalsjökull, Iceland. The either comprise irregular complexes or they show clearly shape typical with their highest points at up-glacier ends streamlined hills. core each consists undisturbed glacio-fluvial deposits glacio-dynamically deformed drift. distribution first type often has characteristic en échelon arrangement,...
Glaciological field investigations were made on the Inland Ice north-east of Jakobshavn. The work is part hydropower at Pâkitsoq in a drainage basin proposed for local project. Brief reports have been given by Thomsen (1983, 1984, 1985, 1986).
A mass balance model based on a positive degree-day approach is used to the balance-elevation relationship for Hans Tausen Iskappe (82.5°N, 37.5°W). Model parameters are estimated by means of field data from glacier basin in north-east corner ice cap. The run total using additional information snow fall distribution accumulation three local cores. indicates that, period 1975-1995, was negative (–0.14 m/y equivalent averaged over icecap, corresponding –104% annual average period). During same...
Simulations of run-off from the Greenland ice sheet were made as part a feasibility study for provision hydroelectric power Ilulissat/Jakobshavn, West Greenland. The aims to see if available short series measurements are typical those under present climatic conditions, and assess possible changes in likely be caused by gross drainage pattern on sheet. Specific was calculated climatological data, whilst volumes integrating specific over area There have been substantial year-to-year variations...
The report “North and northeast Greenland ice discharge from satellite radar interferometry” by E. J. Rignot et al . ([9 May, p. 934][1]) concludes that north glaciers are now discharging an excess of 8 cubic kilometers per year glacial into the ocean, causing regional sheet thinning a positive contribution to sea-level rise. This conclusion is based on comparison total across grounding line (49 year) measured with (ERS) interferometry balance grounding-line (41 calculated compilation...