PANGAEA_970674 Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Aug, 2021; profile P6_226_ICEBIRD_2021_SBLA_20210821T1246_83.46_-2.85_thr06_data_Vers5 Bünger, Hans Jakob; Haas, Christian; Hendricks, Stefan; Krumpen, Thomas Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Aug, 2021; profile P6_226_ICEBIRD_2021_SBLA_20210821T1246_83.46_-2.85_thr06_data_Vers5 2024-07-12 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.970674 Investigator Hans Jakob Bünger buenger@driftnoise.com Earth Science DATE/TIME Time in seconds LATITUDE LONGITUDE POINT DISTANCE from start HEIGHT above ground Surface elevation Ridge height, maximum Ridge boundary, left Ridge boundary, right Ridge width Ridge spacing, typical Lead event (true/false) geoscientificInformation Laser Altimeter P6_226_ICEBIRD_2021_SBLA_20210821T124802 P6-226_ICEBIRD_2021 Ridge Height Ridge Spacing Ridge Width Sea Ice Surface Roughness Single beam laser altimeter Single beam laser altimeter Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py POLAR 6 2021-08-21 2021-08-21 Complete 83.169337 83.749664 -2.9060321000000044 -2.76233400000001 unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 253470 data points text/tab-separated-values 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 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 Electromagnetic induction sounding of sea-ice thickness / SBLA_Processing · GitLab (URI: https://gitlab.awi.de/sitem/sbla_processing.git) 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

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 20210821T1246. 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] ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.970674"!

http://en.wikipedia.org/wiki/Height HEIGHT above ground http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME http://en.wikipedia.org/wiki/Time Time in seconds https://doi.org/10.1038/s41558-024-02199-5 Smoother sea ice with fewer pressure ridges in a more dynamic Arctic https://doi.org/10.17815/jlsrf-2-153 POLAR 6 https://gitlab.awi.de/sitem/sbla_processing.git Electromagnetic induction sounding of sea-ice thickness / SBLA_Processing · GitLab https://gitlab.awi.de/sitem/sbla_processing.git Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py https://hdl.handle.net/10013/epic.30c63deb-b1f5-4c1e-927b-3d8a8d495b82 Sea Ice Surface Roughness from Single Beam Laser Altimeter Measurements - Method Development and Comparison with Airborne Laser Scanner Profiles https://hdl.handle.net/10013/epic.712cd3ea-168f-422c-a182-1b68b884b7d7 IceBird Summer 2021 Campaign: Sea ice surveys with Polar 6 from Station Nord PANGAEA_970697 DIF 9.4 2024-07-12 2026-03-12