The quantitative capabilities of HEM inversion for the sea ice case
Semi-empirical methods are routinely used for Helicopter Electromagnetic (HEM) sea ice thickness mapping. Although these methods yield sufficiently accurate thickness data, it is of interest to determine whether formal one-dimensional (1D) geophysical inversion could yield improved results. If both...
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ftawi:oai:epic.awi.de:13668 2023-09-05T13:20:17+02:00 The quantitative capabilities of HEM inversion for the sea ice case Pfaffling, A. Reid, J. E. 2005 application/pdf https://epic.awi.de/id/eprint/13668/ https://epic.awi.de/id/eprint/13668/1/Pfa2005a.pdf https://hdl.handle.net/10013/epic.24045 https://hdl.handle.net/10013/epic.24045.d001 unknown https://epic.awi.de/id/eprint/13668/1/Pfa2005a.pdf https://hdl.handle.net/10013/epic.24045.d001 Pfaffling, A. and Reid, J. E. (2005) The quantitative capabilities of HEM inversion for the sea ice case , Extended abstracts, 11th European Meeting of Environmental and Engineering Geophysics (EAGEs Near Surface 2005), A022, Palermo, Italy. . hdl:10013/epic.24045 EPIC3Extended abstracts, 11th European Meeting of Environmental and Engineering Geophysics (EAGEs Near Surface 2005), A022, Palermo, Italy. Conference notRev 2005 ftawi 2023-08-22T19:50:42Z Semi-empirical methods are routinely used for Helicopter Electromagnetic (HEM) sea ice thickness mapping. Although these methods yield sufficiently accurate thickness data, it is of interest to determine whether formal one-dimensional (1D) geophysical inversion could yield improved results. If both the thickness and the ice conductivity could be mapped, the results could be used to estimate glaciological parameters such as the age of the sea ice. Sea ice conductivity data could also be potentially used to estimate the strength of the ice sheet, which would be valuable information for planning of icebreaking operations. By investigating synthetic and field data we show that, in the case of level sea ice of thickness up to 2 m, the accuracy of our HEM system is not high enough to sense the small conductivity variations arising from the age of the ice. Sea ice conductivity has a stronger influence on the measured HEM responses in areas of thick, deformed sea ice (pressure ridges), where bulk conductivity is higher as a result of the large seawater-filled porosity. Synthetic three-dimensional HEM data generated for pressure ridge models has shown that the 1D interpretation methods conventionally used for interpretation of sea ice thickness overestimate the true bulk conductivity at 3D features. Conference Object Ice Sheet Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
Semi-empirical methods are routinely used for Helicopter Electromagnetic (HEM) sea ice thickness mapping. Although these methods yield sufficiently accurate thickness data, it is of interest to determine whether formal one-dimensional (1D) geophysical inversion could yield improved results. If both the thickness and the ice conductivity could be mapped, the results could be used to estimate glaciological parameters such as the age of the sea ice. Sea ice conductivity data could also be potentially used to estimate the strength of the ice sheet, which would be valuable information for planning of icebreaking operations. By investigating synthetic and field data we show that, in the case of level sea ice of thickness up to 2 m, the accuracy of our HEM system is not high enough to sense the small conductivity variations arising from the age of the ice. Sea ice conductivity has a stronger influence on the measured HEM responses in areas of thick, deformed sea ice (pressure ridges), where bulk conductivity is higher as a result of the large seawater-filled porosity. Synthetic three-dimensional HEM data generated for pressure ridge models has shown that the 1D interpretation methods conventionally used for interpretation of sea ice thickness overestimate the true bulk conductivity at 3D features. |
format |
Conference Object |
author |
Pfaffling, A. Reid, J. E. |
spellingShingle |
Pfaffling, A. Reid, J. E. The quantitative capabilities of HEM inversion for the sea ice case |
author_facet |
Pfaffling, A. Reid, J. E. |
author_sort |
Pfaffling, A. |
title |
The quantitative capabilities of HEM inversion for the sea ice case |
title_short |
The quantitative capabilities of HEM inversion for the sea ice case |
title_full |
The quantitative capabilities of HEM inversion for the sea ice case |
title_fullStr |
The quantitative capabilities of HEM inversion for the sea ice case |
title_full_unstemmed |
The quantitative capabilities of HEM inversion for the sea ice case |
title_sort |
quantitative capabilities of hem inversion for the sea ice case |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/13668/ https://epic.awi.de/id/eprint/13668/1/Pfa2005a.pdf https://hdl.handle.net/10013/epic.24045 https://hdl.handle.net/10013/epic.24045.d001 |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
EPIC3Extended abstracts, 11th European Meeting of Environmental and Engineering Geophysics (EAGEs Near Surface 2005), A022, Palermo, Italy. |
op_relation |
https://epic.awi.de/id/eprint/13668/1/Pfa2005a.pdf https://hdl.handle.net/10013/epic.24045.d001 Pfaffling, A. and Reid, J. E. (2005) The quantitative capabilities of HEM inversion for the sea ice case , Extended abstracts, 11th European Meeting of Environmental and Engineering Geophysics (EAGEs Near Surface 2005), A022, Palermo, Italy. . hdl:10013/epic.24045 |
_version_ |
1776200993451540480 |