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Bünger, Hans Jakob; Haas, Christian; Hendricks, Stefan; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Aug, 2021; profile P6_226_ICEBIRD_2021_SBLA_20210818T1313_83.52_22.04_thr06_data_Vers5 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.970692, In: Bünger, Hans Jakob; Haas, Christian; Hendricks, Stefan; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Aug, 2021 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.970697

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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 IceBird Summer campaign in Aug, 2021 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by an Airplane (Basler BT-67, Polar-6). 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 (ASTECH - LDM) are provided at a sampling rate of 100 Hz. Sensor accuracy is 2 cm with a beam diameter at surface of 6.3 cm. This specific dataset was obtained on 20210818T1313. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 6.3 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:
Bünger, Hans Jakob (2024): IceBird Summer 2021 Campaign: Sea ice surveys with Polar 6 from Station Nord. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, hdl:10013/epic.712cd3ea-168f-422c-a182-1b68b884b7d7
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: 83.520911 * Median Longitude: 22.036123 * South-bound Latitude: 83.420006 * West-bound Longitude: 20.983507 * North-bound Latitude: 83.759006 * East-bound Longitude: 24.380155
Date/Time Start: 2021-08-18T13:15:30 * Date/Time End: 2021-08-18T13:39:54
Event(s):
P6_226_ICEBIRD_2021_SBLA_20210818T131530 * Latitude Start: 83.432411 * Longitude Start: 24.380155 * Latitude End: 83.759006 * Longitude End: 20.983507 * Date/Time Start: 2021-08-18T13:15:30 * Date/Time End: 2021-08-18T13:39:54 * O2A Registry URI: registry.o2a-data.de * Campaign: P6-226_ICEBIRD_2021 (IceBird) * Basis: POLAR 6 * Method/Device: Single beam laser altimeter (SBLA)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeBünger, Hans JakobGeocode
2Time in secondsTimesBünger, Hans Jakob
3LATITUDELatitudeBünger, Hans JakobGeocode
4LONGITUDELongitudeBünger, Hans JakobGeocode
5POINT DISTANCE from startDistmBünger, Hans JakobGeocode
6HEIGHT above groundHeightmBünger, Hans JakobSingle beam laser altimeter (SBLA)Geocode
7Surface elevationSurf elevmBünger, Hans JakobSingle beam laser altimeter (SBLA)Height of the sea ice surface relative to the level ice
8Ridge height, maximumRidge height maxmBünger, Hans JakobSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyHigest point of a pressure ridge sail
9Ridge boundary, leftRidge bound leftmBünger, Hans JakobSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyLeft boundary of identified pressure ridge sail
10Ridge boundary, rightRidge bound rightmBünger, Hans JakobSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyRight boundary of identified pressure ridge sail
11Ridge widthRidge widthmBünger, Hans JakobSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyWidth of pressure ridge sail
12Ridge spacing, typicalRidge spacingmBünger, Hans JakobSingle beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.pyDistance to preceding ridge sail
13Lead event (true/false)Lead eventBünger, Hans JakobSingle 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:
258394 data points

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