Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009
Helicopter-borne laser profiling of sea ice surface roughness Laser profiler measurements were performed during the CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 cruise to Nares Strait. Airborne surveys were conducted on August 16, 18 and 19, 2009. A laser was mounted on a helic...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.895115 2023-05-15T15:00:57+02:00 Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 Lange, Benjamin Allen Beckers, Justin Casey, J Alec Haas, Christian MEDIAN LATITUDE: 77.583709 * MEDIAN LONGITUDE: -61.478058 * SOUTH-BOUND LATITUDE: 0.000000 * WEST-BOUND LONGITUDE: -67.060000 * NORTH-BOUND LATITUDE: 81.845357 * EAST-BOUND LONGITUDE: 0.000000 * DATE/TIME START: 2009-08-16T18:32:00 * DATE/TIME END: 2009-08-19T19:22:00 2018-10-09 application/zip, 9 datasets https://doi.pangaea.de/10.1594/PANGAEA.895115 https://doi.org/10.1594/PANGAEA.895115 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.895115 https://doi.org/10.1594/PANGAEA.895115 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Lange, Benjamin Allen; Beckers, Justin; Casey, J Alec; Haas, Christian (2019): Airborne observations of summer thinning of multi‐year sea ice originating from the Lincoln Sea. Journal of Geophysical Research: Oceans, 124(1), 243-266, https://doi.org/10.1029/2018JC014383 Dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.895115 https://doi.org/10.1029/2018JC014383 2023-01-20T07:34:13Z Helicopter-borne laser profiling of sea ice surface roughness Laser profiler measurements were performed during the CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 cruise to Nares Strait. Airborne surveys were conducted on August 16, 18 and 19, 2009. A laser was mounted on a helicopter pointing vertically downwards to measure the altitude above the ice surface which nominally was 30 m. Depending on flight speed, the spatial sampling interval ranged between 0.02 and 0.15 m. Positioning of the profiles was performed by means of a Global Positioning System (GPS). After eye inspection of the data and removal of outliers, the low frequency helicopter motion is eleminated from the data using a multiple filter procedure described by Hibler (1972, doi:10.1029/JC077i036p07190), Dierking (1995, doi:10.1029/94JC01938), and Haas et al. (1998, doi:10.1016/S0165-232X(97)00019-0). It takes advantage of the fact that the helicopter height variations are only at low frequencies, whereas the surface roughness is a superimposed, high frequency signal. The resulting ice morphology is obtained relative to the surface of the surrounding level ice. Absolute freeboard, i.e. the height of the surface above the water level, cannot be obtained unless the helicopter height variations are independently determined by means of differential GPS and Inertial navigation systems. The resulting surface profiles can be used to identify pressure ridges, e.g. by a Rayleigh criterion. By this criterion only local maxima which are twice as high as the surrounding local minima are defined as pressure ridges. Dataset Arctic Nares strait Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Arctic Nares ENVELOPE(158.167,158.167,-81.450,-81.450) ENVELOPE(-67.060000,0.000000,81.845357,0.000000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Helicopter-borne laser profiling of sea ice surface roughness Laser profiler measurements were performed during the CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 cruise to Nares Strait. Airborne surveys were conducted on August 16, 18 and 19, 2009. A laser was mounted on a helicopter pointing vertically downwards to measure the altitude above the ice surface which nominally was 30 m. Depending on flight speed, the spatial sampling interval ranged between 0.02 and 0.15 m. Positioning of the profiles was performed by means of a Global Positioning System (GPS). After eye inspection of the data and removal of outliers, the low frequency helicopter motion is eleminated from the data using a multiple filter procedure described by Hibler (1972, doi:10.1029/JC077i036p07190), Dierking (1995, doi:10.1029/94JC01938), and Haas et al. (1998, doi:10.1016/S0165-232X(97)00019-0). It takes advantage of the fact that the helicopter height variations are only at low frequencies, whereas the surface roughness is a superimposed, high frequency signal. The resulting ice morphology is obtained relative to the surface of the surrounding level ice. Absolute freeboard, i.e. the height of the surface above the water level, cannot be obtained unless the helicopter height variations are independently determined by means of differential GPS and Inertial navigation systems. The resulting surface profiles can be used to identify pressure ridges, e.g. by a Rayleigh criterion. By this criterion only local maxima which are twice as high as the surrounding local minima are defined as pressure ridges. |
format |
Dataset |
author |
Lange, Benjamin Allen Beckers, Justin Casey, J Alec Haas, Christian |
spellingShingle |
Lange, Benjamin Allen Beckers, Justin Casey, J Alec Haas, Christian Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 |
author_facet |
Lange, Benjamin Allen Beckers, Justin Casey, J Alec Haas, Christian |
author_sort |
Lange, Benjamin Allen |
title |
Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 |
title_short |
Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 |
title_full |
Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 |
title_fullStr |
Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 |
title_full_unstemmed |
Airborne surface roughness and sea ice thickness measurements during CCGS Henry Larsen cruise: Canadian Arctic Through flow (CATs) 2009 |
title_sort |
airborne surface roughness and sea ice thickness measurements during ccgs henry larsen cruise: canadian arctic through flow (cats) 2009 |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.895115 https://doi.org/10.1594/PANGAEA.895115 |
op_coverage |
MEDIAN LATITUDE: 77.583709 * MEDIAN LONGITUDE: -61.478058 * SOUTH-BOUND LATITUDE: 0.000000 * WEST-BOUND LONGITUDE: -67.060000 * NORTH-BOUND LATITUDE: 81.845357 * EAST-BOUND LONGITUDE: 0.000000 * DATE/TIME START: 2009-08-16T18:32:00 * DATE/TIME END: 2009-08-19T19:22:00 |
long_lat |
ENVELOPE(158.167,158.167,-81.450,-81.450) ENVELOPE(-67.060000,0.000000,81.845357,0.000000) |
geographic |
Arctic Nares |
geographic_facet |
Arctic Nares |
genre |
Arctic Nares strait Sea ice |
genre_facet |
Arctic Nares strait Sea ice |
op_source |
Supplement to: Lange, Benjamin Allen; Beckers, Justin; Casey, J Alec; Haas, Christian (2019): Airborne observations of summer thinning of multi‐year sea ice originating from the Lincoln Sea. Journal of Geophysical Research: Oceans, 124(1), 243-266, https://doi.org/10.1029/2018JC014383 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.895115 https://doi.org/10.1594/PANGAEA.895115 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.895115 https://doi.org/10.1029/2018JC014383 |
_version_ |
1766333005676150784 |