Mapping_Lewington_et_al_2020.zip (961.68 kB)

Mapping of meltwater pathways around the Keewatin sector of the Laurentide ice sheet from ArcticDEM data

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posted on 13.08.2020 by Emma Lewington, Stephen Livingstone, Christopher Clark, Andrew Sole, Robert Storrar

This dataset contains meltwater pathways i.e. the manual digitisation of all visible traces of subglacial meltwater flow (e.g. meltwater channels, meltwater tracks and eskers).


Mapping was undertaken in ArcGIS 10.4 using hill shaded Digital Surface Models (DSMs) following standard practices. Meltwater pathway centrelines were mapped as polylines.


We used 10 m ArcticDEM data (freely available at: https://www.pgc.umn.edu/data/arcticdem/). Data is projected to National Snow and Ice Data Centre (NSIDIC) Sea Ice Polar Stereographic North and referenced to WGS84 horizontal datum (EPSG:3413). Mapping was undertaken using the same projection.


The meltwater pathways mapped have been updated since the publication of this paper. Updated mapping is included here so as to present the most up to date and complete efforts.


However, updated pathways only account for ~ 2 % of total, many of which are smaller, fine-scale features. Most of the updated pathways occur outside of the sample areas used in the paper and thus overall are unlikely to alter any conclusions made within the paper (Lewington et al., 2020).



For more details please see the associated paper:


Lewington, E.L.M. Livingstone, S.J. Clark, C.D. Sole, A.J. Storrar, R.D. A model for interaction between conduits and surrounding hydraulically connected distributed drainage based on geomorphological evidence from Keewatin, Canada. The Cryosphere. doi: https://doi.org/10.5194/tc-2020-10. 2020


Funding

Emma Lewington was funded through a NERC doctoral training partnership ACCE DTP (NE/L002450/1)

PALGLAC (PI Chris Clark) - funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 787263)

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