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Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T2112_84.63_-79.52_thr06_data_Vers5 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.970464, In: Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.970485

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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 GreenIce campaign in May, 2004 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 20040512T2112. 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:
Haas, Christian; Hendricks, Stefan; Doble, M (2006): Comparison of the sea ice thickness distribution in the Lincoln Sea and adjacent Arctic Ocean in 2004 and 2005. Annals of Glaciology, 44(1), 247-252, https://doi.org/10.3189/172756406781811781
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: 84.630864 * Median Longitude: -79.523771 * South-bound Latitude: 84.561502 * West-bound Longitude: -81.244499 * North-bound Latitude: 84.697322 * East-bound Longitude: -77.780351
Date/Time Start: 2004-05-12T21:14:45 * Date/Time End: 2004-05-12T21:30:08
Event(s):
GreenICE2004_SBLA_20040512T211445 * Latitude Start: 84.697324 * Longitude Start: -77.780314 * Latitude End: 84.561502 * Longitude End: -81.244499 * Date/Time Start: 2004-05-12T21:14:45 * Date/Time End: 2004-05-12T21:30:08 * O2A Registry URI: registry.o2a-data.de * Campaign: GreenICE2004 * Basis: Helicopter * Method/Device: Single beam laser altimeter (SBLA)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeHendricks, StefanGeocode
2Time in secondsTimesHendricks, Stefan
3LATITUDELatitudeHendricks, StefanGeocode
4LONGITUDELongitudeHendricks, StefanGeocode
5POINT DISTANCE from startDistmHendricks, StefanGeocode
6HEIGHT above groundHeightmHendricks, StefanSingle beam laser altimeter (SBLA)Geocode
7Surface elevationSurf elevmHendricks, StefanSingle beam laser altimeter (SBLA)Height of the sea ice surface relative to the level ice
8Ridge height, maximumRidge height maxmHendricks, StefanSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyHigest point of a pressure ridge sail
9Ridge boundary, leftRidge bound leftmHendricks, StefanSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyLeft boundary of identified pressure ridge sail
10Ridge boundary, rightRidge bound rightmHendricks, StefanSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyRight boundary of identified pressure ridge sail
11Ridge widthRidge widthmHendricks, StefanSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyWidth of pressure ridge sail
12Ridge spacing, typicalRidge spacingmHendricks, StefanSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyDistance to preceding ridge sail
13Lead event (true/false)Lead eventHendricks, StefanSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyIf 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
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
187530 data points

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