Citation:

PANGAEA.984362

Name: Spatial topographic roughness (RMSh) for all along-flow flightlines of the bed topography of the Northeast Greenland Ice Stream, downstream of the EastGRIP ice core site (2018 and 2022 NEGIS surveys)
Published: 2025-09-30
License: https://creativecommons.org/licenses/by/4.0/
Keywords: AWI UWB; Northeast Greenland Ice Stream (NEGIS); radio echo sounding; Roughness

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Published: 2025-09-30 • DOI registered: 2025-10-29

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Abstract:

The Northeast Greenland Ice Stream (NEGIS) is an elongated feature extending ~600 km into the interior of the Greenland Ice Sheet. Here, we investigate detailed subglacial topography along the length of the NEGIS to ascertain the characteristics of the ice stream bed. Spatial topographic roughness describes the standard deviation of vertical change in bed elevation over a given horizontal distance (Root Mean Square height, or RMSh). RMSh values were derived from ice thickness data from AWI's P5-233_NEGIS_2022 and P6-211_EGRIP_NOR_2018 flight campaigns, where the majority of profiles were oriented parallel or perpendicular to ice flow direction. A moving window size of 960 m (64 data points) was used to calculate RMSh, and values are omitted where gaps in the ice thickness data were present. Roughness anisotropy was also calculated at the intersection of two flightlines, as the ratio between along- and across-flow roughness.

Keyword(s):

AWI UWB; Northeast Greenland Ice Stream (NEGIS); radio echo sounding; Roughness

Related to:

Carter, Charlotte; Franke, Steven; Paxman, Guy J G; Jamieson, Stewart S R; Bentley, Michael J; Jansen, Daniela; Paden, John D; Eisen, Olaf (2025): Topographic and geologic controls on the Northeast Greenland Ice Stream. Annals of Glaciology, 66, e29, https://doi.org/10.1017/aog.2025.10028

Carter, Charlotte; Jansen, Daniela; Franke, Steven; Helm, Veit; Steinhage, Daniel; Paden, John D; Eisen, Olaf (2023): Ice Thickness from downstream of the EastGRIP ice core site, North East Greenland Ice Stream, recorded with the airborne AWI UWB radar system [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.963555

Franke, Steven; Jansen, Daniela; Binder, Tobias; Dörr, Nils; Helm, Veit; Paden, John D; Steinhage, Daniel; Eisen, Olaf (2019): Bedrock topography and ice thickness in the onset region of the Northeast Greenland Ice Stream recorded with the airborne AWI Ultra-Wideband radar (UWB) in 2018 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.907918

Project(s):

East Greenland Ice-core Project (EGRIP)

Coverage:

Median Latitude: 75.782734 * Median Longitude: -35.301868 * South-bound Latitude: 74.029701 * West-bound Longitude: -40.432236 * North-bound Latitude: 78.330766 * East-bound Longitude: -26.527519

Date/Time Start: 2018-05-08T00:00:00 * Date/Time End: 2022-06-16T20:11:23

Event(s):

EGRIP-NOR-18 * Latitude: 75.633000 * Longitude: -35.992000 * Date/Time Start: 2018-05-08T00:00:00 * Date/Time End: 2018-05-17T00:00:00 * Campaign: (EGRIP-NOR) * Basis: POLAR 6 * Method/Device: Multiple investigations (MULT)

P5_233_NEGIS_2022_2206030202 * Latitude Start: 75.635029 * Longitude Start: -35.988516 * Latitude End: 75.635261 * Longitude End: -35.987156 * Date/Time Start: 2022-06-03T13:14:05 * Date/Time End: 2022-06-03T16:18:03 * Location: Arctic * Campaign: (NEGIS-FLOW, NEGIS-ANISO, NEGIS Folds) * Basis: POLAR 5 * Method/Device: Aircraft (AC)

P5_233_NEGIS_2022_2206070301 * Latitude Start: 75.635047 * Longitude Start: -35.988611 * Latitude End: 75.635306 * Longitude End: -35.986977 * Date/Time Start: 2022-06-07T12:08:21 * Date/Time End: 2022-06-07T16:47:21 * Location: Arctic * Campaign: (NEGIS-FLOW, NEGIS-ANISO, NEGIS Folds) * Basis: POLAR 5 * Method/Device: Aircraft (AC)

Parameter(s):

#	Name	Short Name	Principal Investigator	Comment
1	Point ID	Point ID	Carter, Charlotte
2	LONGITUDE	Longitude	Carter, Charlotte	Geocode
3	LATITUDE	Latitude	Carter, Charlotte	Geocode
4	Root mean square height	RMSh	Carter, Charlotte	for all along-flow flightlines, value for a moving window size of 960 m

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

778490 data points

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