Citation:

PANGAEA.984362

Name: Roughness anisotropy calculated at flightline intersections of the 2018 and 2022 NEGIS surveys, Northeast Greenland Ice Stream, downstream of the EastGRIP ice core site
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: 75.635057 * Median Longitude: -35.987942 * South-bound Latitude: 75.633000 * West-bound Longitude: -35.992000 * North-bound Latitude: 75.635306 * East-bound Longitude: -35.986977

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)

Comment:

Parameters for both points analysed are included.

Parameter(s):

#	Name	Short Name	Unit	Comment
1	Point ID	Point ID		No. 1
2	Line ID	Line ID		No. 1
3	LONGITUDE	Longitude		Geocode – No. 1
4	LATITUDE	Latitude		Geocode – No. 1
5	Bed elevation	Bed elev	m	No. 1
6	Root mean square height	RMSh		No. 1
7	Point ID	Point ID		No. 2
8	Line ID	Line ID		No. 2
9	LONGITUDE	Longitude		Geocode – No. 2
10	LATITUDE	Latitude		Geocode – No. 2
11	Bed elevation	Bed elev	m	No. 2
12	Root mean square height	RMSh		No. 2
13	Roughness anisotropy	Roughness aniso

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

8943 data points

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