/* DATA DESCRIPTION:
Citation:	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.970253
Abstract:	Sea ice surface roughness data were obtained during the ARK-XXVII/3 campaign in Sep, 2012 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 (RV-Polarstern Helicopter). 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 dataset includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 5.8 cm .
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:	Boetius, Antje (2013): The Expedition of the Research Vessel Polarstern to the Arctic in 2012 (ARK-XXVII/3). Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 663, 166 pp, https://doi.org/10.2312/BzPM_0663_2013
Related code / software:	Electromagnetic induction sounding of sea-ice thickness / SBLA_Processing · GitLab (URI: https://gitlab.awi.de/sitem/sbla_processing.git)
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: 85.251407 * MEDIAN LONGITUDE: 52.220781 * SOUTH-BOUND LATITUDE: 84.299452 * WEST-BOUND LONGITUDE: 47.510891 * NORTH-BOUND LATITUDE: 86.320068 * EAST-BOUND LONGITUDE: 59.703566
	DATE/TIME START: 2012-09-26T11:35:42 * DATE/TIME END: 2012-09-27T11:39:43
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Size:	10 datasets
*/
/* TABULAR SUMMARY OF DATASETS LISTED IN THIS COLLECTION: */
Filename	Citation of child dataset
ARK-XXVII-3_SBLA_20120926T1126_86.11_52.16_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120926T1126_86.11_52.16_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970252
ARK-XXVII-3_SBLA_20120926T1154_85.67_51.81_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120926T1154_85.67_51.81_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970246
ARK-XXVII-3_SBLA_20120926T1210_85.74_51.78_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120926T1210_85.74_51.78_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970247
ARK-XXVII-3_SBLA_20120926T1234_86.12_51.96_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120926T1234_86.12_51.96_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970244
ARK-XXVII-3_SBLA_20120927T0722_84.97_53.70_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120927T0722_84.97_53.70_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970249
ARK-XXVII-3_SBLA_20120927T0817_84.73_57.13_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120927T0817_84.73_57.13_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970250
ARK-XXVII-3_SBLA_20120927T0840_84.80_52.92_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120927T0840_84.80_52.92_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970243
ARK-XXVII-3_SBLA_20120927T0943_84.53_52.23_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120927T0943_84.53_52.23_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970251
ARK-XXVII-3_SBLA_20120927T1102_84.91_49.61_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120927T1102_84.91_49.61_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970248
ARK-XXVII-3_SBLA_20120927T1125_84.92_48.87_thr06_data_Vers5.tab	Krumpen, Thomas; Haas, Christian; Hendricks, Stefan (2024): Laser altimeter data obtained over sea-ice during the ARK-XXVII/3 campaign in Sep, 2012; profile ARK-XXVII-3_SBLA_20120927T1125_84.92_48.87_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970245
