Citation:

PANGAEA.970461

Name: Laser altimeter data obtained over sea-ice during the CryoVEx campaign in Mar-Apr, 2014; profile CryoVEx_ARK_2014_SBLA_20140401T0319_83.98_-8.43_thr06_data_Vers5
Published: 2024-07-12
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Laser Altimeter; Ridge Height; Ridge Spacing; Ridge Width; Sea Ice Surface Roughness

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Published: 2024-07-12 • DOI registered: 2024-08-27

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Abstract:

Sea ice surface roughness data were obtained during the CryoVEx campaign in Mar-Apr, 2014 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by a Helicopter (Unknown model). A method developed by Hibler (1972) was used to a) isolate the surface profile from low-frequency variations associated with the aircraft motion and b) to identify pressure ridge sails. The processing steps are described in https://epic.awi.de/id/eprint/56364/. We applied a ridge detection threshold of 0.6 m, which means that only sails higher 0.6 m are detected. Version and name of the processing routine: Laser_Altimeter_Processing_VS5_06_20.py (vers.5, Feb 22, 2024, https://gitlab.awi.de/sitem/sbla_processing.git). SBLA records (RIEGL - LD90) are provided at a sampling rate of 100 Hz. Sensor accuracy is 5 cm with a beam diameter at surface of 5.8 cm. This specific dataset was obtained on 20140401T0319. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 5.8 cm . File name: [DMS/PANGAEA Campaing Identifier] + [DEVICE] + [DATE/TIME] + [LAT/LON] + [Detection Threshold] + [Object] + [Version] + [Format]

Keyword(s):

Laser Altimeter; Ridge Height; Ridge Spacing; Ridge Width; Sea Ice Surface Roughness

Supplement to:

Krumpen, Thomas; von Albedyll, Luisa; Bünger, Hans Jakob; Castellani, Giulia; Hartmann, Jörg; Helm, Veit; Hendricks, Stefan; Hutter, Nils; Landy, Jack; Lisovski, Simeon; Lüpkes, Christof; Rohde, Jan; Suhrhoff, Mira; Haas, Christian (2025): Smoother sea ice with fewer pressure ridges in a more dynamic Arctic. Nature Climate Change, https://doi.org/10.1038/s41558-024-02199-5

Related to:

Hvidegaard, Sine; Nielsen, J E; Sørensen, Louise Sandberg; Simonsen, Sebastian B; Skourup, Henriette; Forsberg, René; Helm, Veit; Bjerg, T (2015): Airborne ASIRAS radar and laser scanner measurements during 2014 CryoVEx campaign in the Arctic. National Space Institute (DTU Space); Technical University of Denmark, https://earth.esa.int/eogateway/documents/20142/37627/ESA-CryoVEx-ASIRAS-2014-report.pdf

Related code / software:

Electromagnetic induction sounding of sea-ice thickness / SBLA_Processing · GitLab

Data processing report:

Suhrhoff, Mira (2021): Sea Ice Surface Roughness from Single Beam Laser Altimeter Measurements - Method Development and Comparison with Airborne Laser Scanner Profiles [thesis]. Universität Trier, hdl:10013/epic.30c63deb-b1f5-4c1e-927b-3d8a8d495b82

Coverage:

Median Latitude: 83.975348 * Median Longitude: -8.428710 * South-bound Latitude: 83.387191 * West-bound Longitude: -10.353499 * North-bound Latitude: 84.555682 * East-bound Longitude: -6.267543

Date/Time Start: 2014-04-01T19:16:47 * Date/Time End: 2014-04-01T19:54:05

Event(s):

CryoVEx_ARK_2014_SBLA_20140401T191647 * Latitude Start: 84.555682 * Longitude Start: -6.267543 * Latitude End: 83.387191 * Longitude End: -10.353499 * Date/Time Start: 2014-04-01T19:16:47 * Date/Time End: 2014-04-01T19:54:05 * O2A Registry URI: registry.o2a-data.de * Campaign: (CryoVEx) * Basis: Helicopter * Method/Device: (SBLA)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DATE/TIME	Date/Time		Haas, Christian		Geocode
2	Time in seconds	Time	s	Haas, Christian
3	LATITUDE	Latitude		Haas, Christian		Geocode
4	LONGITUDE	Longitude		Haas, Christian		Geocode
5	POINT DISTANCE from start	Dist	m	Haas, Christian		Geocode
6	HEIGHT above ground	Height	m	Haas, Christian	Single beam laser altimeter (SBLA)	Geocode
7	Surface elevation	Surf elev	m	Haas, Christian	Single beam laser altimeter (SBLA)	Height of the sea ice surface relative to the level ice
8	Ridge height, maximum	Ridge height max	m	Haas, Christian	Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py	Higest point of a pressure ridge sail
9	Ridge boundary, left	Ridge bound left	m	Haas, Christian	Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py	Left boundary of identified pressure ridge sail
10	Ridge boundary, right	Ridge bound right	m	Haas, Christian	Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py	Right boundary of identified pressure ridge sail
11	Ridge width	Ridge width	m	Haas, Christian	Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py	Width of pressure ridge sail
12	Ridge spacing, typical	Ridge spacing	m	Haas, Christian	Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py	Distance to preceding ridge sail
13	Lead event (true/false)	Lead event		Haas, Christian	Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py	If set to 1, then EM-Bird based sea-ice thickness is below 0.2 m (lead/open water). Note that EM-Bird data is provided at a sampling rate of 10 Hz