Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling

Solgaard, Anne; Messerli, Alexandra; Schellenberger, Thomas; Hvidberg, Christine S.; Grinsted, Aslak; Jackson, Miriam; Zwinger, Thomas; Karlsson, Nanna B.; Dahl-Jensen, Dorthe

doi:10.1017/jog.2018.45

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…The background image is from Sentinel 2 (Copernicus Sentinel data, processed by European Space Agency -ESA) from 27th March 2023. The location of the map is indicated on the overview map in red also showing surface topography contours [17,18] and surface velocities in blue [19].…”

Section: Mainmentioning

confidence: 99%

Unique In-situ Measurements from Greenland Fjord Show Winter Freshening by Subglacial Melt

Hansen,

Karlsson,

How

et al. 2024

Preprint

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The interaction between glacier fronts and ocean waters is one of the key uncertainties for projecting future ice mass loss. Direct observations at glacier fronts are sparse but studies indicate that the magnitude and timing of freshwater fluxes are crucial in determining fjord circulation, ice frontal melt and ecosystem habitability. Particularly wintertime dynamics are severely understudied due to inaccessible conditions leading to a bias towards summer observations. In this study, we present novel in-situ observations of temperature and salinity acquired at the front of a marine-terminating glacier and in surrounding fjords in late winter in Greenland. The observations indicate the existence of an anomalously fresh pool of water by the glacier front. To our knowledge, our study is the first to document the existence of subglacially discharged freshwater outside the summer season, suggesting that meltwater generated at the bed of the glacier discharges into the fjord during winter. Our results have implications for the heat exchange between glacier fronts and ocean waters, glacier frontal melt rates, ocean mixing and currents, and biological production.

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Section: Mainmentioning

confidence: 99%

Unique In-situ Measurements from Greenland Fjord Show Winter Freshening by Subglacial Melt

Hansen,

Karlsson,

How

et al. 2024

Preprint

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“…This toolbox addresses and combines georectification and feature-tracking processes. Although ImGRAFT was primarily focused on terrestrial oblique images, several authors have used it with satellite imagery, with good results (e.g., [59,60]). There are also other methods which do not use automatic calculations, such as theodolite techniques, differential GPS and TLS (terrestrial laser scanner).…”

Section: Solutions Based Entirely On Feature Tracking Softwarementioning

confidence: 99%

Mapping Mountain Landforms and Its Dynamics: Study Cases in Tropical Environments

2022

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High mountain areas are critical for water security and natural hazard dynamics, as well as glacier and ecosystem conservation in a warming world. We present a brief account of the methodological steps for geomorphological mapping in mountain areas, including the required scale, the legends, technology, and software. We analyze the best imagery sources and their combination with fieldwork and geographical information systems (GIS), in performing accurate cartography. In addition, we present two case studies in which we apply several methods described previously. Firstly, we carried out a classical and digital geomorphological mapping of Cerro Chirripó (Talamanca Range). Secondly, we studied the Reserva Biológica Alberto Manuel Brenes (Central Volcanic Range), where we used UAVs to map high-resolution fluvial geomorphology. This methodological framework is suitable for future geomorphological surveys in mountain areas worldwide. Moreover, the case studies can give ideas on the application of these approaches to different mountainous environments.

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Próba identyfikacji zasięgu oddziaływania lodowca górskiego na temperaturę powietrza - na przykładzie lodowca Engabreen (Norwegia)

Dyszy,

Grajek

2023

10.14746/bgf

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This study aims to identify the extent of mountain glacier influence on air temperature in the vertical profile, using the Engabreen glacier (Norway) as an example. An important aspect of the work is also an analysis of the variation in surface temperature and wind conditions in the valley of the Engabreen glacier. The analysis was carried out based on measurement data of vertical air temperature taken over the glacier cavity with sensors mounted to an unmanned aerial vehicle. The field survey was carried out on 25 July 2022 in the afternoon. The results of the measurements may indicate that the presence of the glacier reduces the air temperature gradient with altitude compared to the surrounding areas. Above the glacier, the air temperature in the vertical profile increases with height. Based on the profiles taken above the glacier, it was concluded that the surface of the glacier influences the air temperature above it up to an altitude of 37–53 m above ground level.

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Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling

Cited by 3 publications

References 49 publications

Unique In-situ Measurements from Greenland Fjord Show Winter Freshening by Subglacial Melt

Unique In-situ Measurements from Greenland Fjord Show Winter Freshening by Subglacial Melt

Mapping Mountain Landforms and Its Dynamics: Study Cases in Tropical Environments

Próba identyfikacji zasięgu oddziaływania lodowca górskiego na temperaturę powietrza - na przykładzie lodowca Engabreen (Norwegia)

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