Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice
.The accuracy of electromagnetic-inductive EM sea-ice thickness measurements performed from a moving icebreaker is evaluated. Ice thickness distributions and ridge statistics are derived. In the Bellingshausen Sea the ice was moderately deformed with mean and modal ice thicknesses of 1.3 and 0.9 m,...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.465.5329 2023-05-15T13:23:57+02:00 Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice Christian Haas The Pennsylvania State University CiteSeerX Archives 1998 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.465.5329 http://epic.awi.de/1142/1/Haa1998a.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.465.5329 http://epic.awi.de/1142/1/Haa1998a.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://epic.awi.de/1142/1/Haa1998a.pdf EM sea-ice thickness measurements Drill-hole measurements Summer sea-ice properties Bellingshausen Sea Amundsen Sea text 1998 ftciteseerx 2016-01-08T06:53:29Z .The accuracy of electromagnetic-inductive EM sea-ice thickness measurements performed from a moving icebreaker is evaluated. Ice thickness distributions and ridge statistics are derived. In the Bellingshausen Sea the ice was moderately deformed with mean and modal ice thicknesses of 1.3 and 0.9 m, respectively. In contrast, the heavily deformed ice in the Amundsen Sea had mean thicknesses between 2.3 and 3.1 m, with modes between 1.6 and 2.7 m. By means of the measured apparent electrical conductivity on ice of known thickness, the conductivity of the perennial summer ice was found to be significant and could not be neglected in the calibration of EM measurements. The high conductivity is mainly due to the widespread occurrence of seawater-filled gaps close to the ice surface. The system, consisting of commercially available instruments, yielded reliable mean thickness estimates. This is shown by comparison with drill-hole measurements and visual observations. However, the thickness profiles appear highly low-pass filtered compared to their surface height profile determined with a laser altimeter. Thus the system possesses a limited lateral resolution such that the thickness of single pressure ridges cannot be resolved. This is only in part attributed to the trade-off between increasing instrument height and decreasing lateral resolution of EM measurements. The low resolution is mainly due to the particular EM instrument, as its sensitivity is highly reduced if used far above the water surface, and it has a comparatively long time constant of 1 s. Additionally, the water-filled gap in the ice generally reduces the sensitivity of the measured apparent conductivity to ice Text Amundsen Sea Bellingshausen Sea Icebreaker Sea ice Unknown Amundsen Sea Bellingshausen Sea |
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ftciteseerx |
language |
English |
topic |
EM sea-ice thickness measurements Drill-hole measurements Summer sea-ice properties Bellingshausen Sea Amundsen Sea |
spellingShingle |
EM sea-ice thickness measurements Drill-hole measurements Summer sea-ice properties Bellingshausen Sea Amundsen Sea Christian Haas Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice |
topic_facet |
EM sea-ice thickness measurements Drill-hole measurements Summer sea-ice properties Bellingshausen Sea Amundsen Sea |
description |
.The accuracy of electromagnetic-inductive EM sea-ice thickness measurements performed from a moving icebreaker is evaluated. Ice thickness distributions and ridge statistics are derived. In the Bellingshausen Sea the ice was moderately deformed with mean and modal ice thicknesses of 1.3 and 0.9 m, respectively. In contrast, the heavily deformed ice in the Amundsen Sea had mean thicknesses between 2.3 and 3.1 m, with modes between 1.6 and 2.7 m. By means of the measured apparent electrical conductivity on ice of known thickness, the conductivity of the perennial summer ice was found to be significant and could not be neglected in the calibration of EM measurements. The high conductivity is mainly due to the widespread occurrence of seawater-filled gaps close to the ice surface. The system, consisting of commercially available instruments, yielded reliable mean thickness estimates. This is shown by comparison with drill-hole measurements and visual observations. However, the thickness profiles appear highly low-pass filtered compared to their surface height profile determined with a laser altimeter. Thus the system possesses a limited lateral resolution such that the thickness of single pressure ridges cannot be resolved. This is only in part attributed to the trade-off between increasing instrument height and decreasing lateral resolution of EM measurements. The low resolution is mainly due to the particular EM instrument, as its sensitivity is highly reduced if used far above the water surface, and it has a comparatively long time constant of 1 s. Additionally, the water-filled gap in the ice generally reduces the sensitivity of the measured apparent conductivity to ice |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Christian Haas |
author_facet |
Christian Haas |
author_sort |
Christian Haas |
title |
Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice |
title_short |
Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice |
title_full |
Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice |
title_fullStr |
Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice |
title_full_unstemmed |
Evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice |
title_sort |
evaluation of ship-based electromagnetic-inductive thickness measurements of summer sea-ice |
publishDate |
1998 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.465.5329 http://epic.awi.de/1142/1/Haa1998a.pdf |
geographic |
Amundsen Sea Bellingshausen Sea |
geographic_facet |
Amundsen Sea Bellingshausen Sea |
genre |
Amundsen Sea Bellingshausen Sea Icebreaker Sea ice |
genre_facet |
Amundsen Sea Bellingshausen Sea Icebreaker Sea ice |
op_source |
http://epic.awi.de/1142/1/Haa1998a.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.465.5329 http://epic.awi.de/1142/1/Haa1998a.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766376562338299904 |