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Haas, Christian; Hendricks, Stefan; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the ARK-XI/1 campaign in Jul-Sep, 1995; profile ARK-XI-1_SBLA_19950725T1107_78.90_147.00_thr06_data_Vers5 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.969659, In: Haas, Christian; Hendricks, Stefan; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the ARK-XI/1 campaign in Jul-Sep, 1995 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.969675

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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 ARK-XI/1 campaign in Jul-Sep, 1995 with a Single Beam Laser Altimeter (SBLA) mounted on an/a Helicopter (Mil MI-8) . 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 (IBEO - PS100E) are provided at a sampling rate of 200 Hz. Sensor accuracy is 3 cm with a beam diameter at surface of 11.4 cm. This specific dataset was obtained on 19950725T1107. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 11.4 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:
Rachor, Eike (1997): Scientific Cruise Report of the Arctic Expedition ARK-XI/1 of the RV Polarstern in 1995 (German-Russian Project LADI: Laptev Sea - Arctic Deep Basin Interrelations) (Wissenschaftlicher Fahrtbericht über die Arktis-Expedition ARK-XI/1 von 1995 mit FS Polarstern). Berichte zur Polarforschung = Reports on Polar Research, 226, 330 pp, https://doi.org/10.2312/BzP_0226_1997
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: 78.896156 * Median Longitude: 146.996897 * South-bound Latitude: 78.795310 * West-bound Longitude: 146.550800 * North-bound Latitude: 78.997002 * East-bound Longitude: 147.442990
Date/Time Start: 1995-07-25T11:07:00 * Date/Time End: 1995-07-25T11:17:11
Event(s):
ARK-XI-1_SBLA_19950725T110700 * Latitude Start: 78.997002 * Longitude Start: 147.442990 * Latitude End: 78.795310 * Longitude End: 146.550800 * Date/Time Start: 1995-07-25T11:07:00 * Date/Time End: 1995-07-25T11:17:11 * O2A Registry URI: registry.o2a-data.de * Campaign: ARK-XI/1 (PS36) * Basis: Polarstern * Method/Device: Single beam laser altimeter (SBLA)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeHaas, ChristianGeocode
2Time in secondsTimesHaas, Christian
3LATITUDELatitudeHaas, ChristianGeocode
4LONGITUDELongitudeHaas, ChristianGeocode
5POINT DISTANCE from startDistmHaas, ChristianGeocode
6HEIGHT above groundHeightmHaas, ChristianSingle beam laser altimeter (SBLA)Geocode
7Surface elevationSurf elevmHaas, ChristianSingle beam laser altimeter (SBLA)Height of the sea ice surface relative to the level ice
8Ridge height, maximumRidge height maxmHaas, ChristianSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyHigest point of a pressure ridge sail
9Ridge boundary, leftRidge bound leftmHaas, ChristianSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyLeft boundary of identified pressure ridge sail
10Ridge boundary, rightRidge bound rightmHaas, ChristianSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyRight boundary of identified pressure ridge sail
11Ridge widthRidge widthmHaas, ChristianSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyWidth of pressure ridge sail
12Ridge spacing, typicalRidge spacingmHaas, ChristianSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyDistance to preceding ridge sail
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
246061 data points

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