Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking
The porosity of sea ice is a fundamental physical parameter that governs the mechanical strength of sea ice and the mobility of gases and nutrients for biological processes and biogeochemical cycles in the sea ice layer. However, little is known about the spatial distribution of the sea ice porosity...
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Society of Exploration Geophysicists
2016
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Online Access: | https://epic.awi.de/id/eprint/39097/ https://epic.awi.de/id/eprint/39097/1/Hunkeler_Geophysics_2016.pdf https://hdl.handle.net/10013/epic.46334 https://hdl.handle.net/10013/epic.46334.d001 |
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ftawi:oai:epic.awi.de:39097 2024-09-15T18:34:05+00:00 Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking Hunkeler, Priska Hendricks, Stefan Hoppmann, Mario Farquharson, Colin Kalscheuer, Thomas Grab, Melchior Kaufmann, Manuela S. Rabenstein, Lasse Gerdes, Rüdiger 2016-01 application/pdf https://epic.awi.de/id/eprint/39097/ https://epic.awi.de/id/eprint/39097/1/Hunkeler_Geophysics_2016.pdf https://hdl.handle.net/10013/epic.46334 https://hdl.handle.net/10013/epic.46334.d001 unknown Society of Exploration Geophysicists https://epic.awi.de/id/eprint/39097/1/Hunkeler_Geophysics_2016.pdf https://hdl.handle.net/10013/epic.46334.d001 Hunkeler, P. , Hendricks, S. orcid:0000-0002-1412-3146 , Hoppmann, M. orcid:0000-0003-1294-9531 , Farquharson, C. , Kalscheuer, T. , Grab, M. , Kaufmann, M. S. , Rabenstein, L. and Gerdes, R. (2016) Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking , GEOPHYSICS, 81 (1), WA45-WA58 . doi:10.1190/GEO2015-0130.1 <https://doi.org/10.1190/GEO2015-0130.1> , hdl:10013/epic.46334 EPIC3GEOPHYSICS, Society of Exploration Geophysicists, 81(1), pp. WA45-WA58 Article isiRev 2016 ftawi https://doi.org/10.1190/GEO2015-0130.1 2024-06-24T04:13:16Z The porosity of sea ice is a fundamental physical parameter that governs the mechanical strength of sea ice and the mobility of gases and nutrients for biological processes and biogeochemical cycles in the sea ice layer. However, little is known about the spatial distribution of the sea ice porosity and its variability between different sea ice types; an efficient and nondestructive method to measure this property is currently missing. Sea ice porosity is linked to the bulk electrical conductivity of sea ice, a parameter routinely used to discriminate between sea ice and seawater by electromagnetic (EM) induction sensors. Here, we have evaluated the prospect of porosity retrieval of sea ice by means of bulk conductivity estimates using 1D multifrequency EM inversion schemes. We have focused on two inversion algorithms, a smoothness-constrained inversion and a Marquardt-Levenberg inversion, which we modified for the nonlinear signal bias caused by a passive bucking coil operated in such a highly conductive environment. Using synthetic modeling studies, 1D inversion algorithms and multiple frequencies, we found that we can resolve the sea ice conductivity within +-0.01 S∕m. Using standard assumptions for the conductivity- porosity relation of sea ice, we were able to estimate porosity with an uncertainty of +-1.2%, which enables efficient and nondestructive surveys of the internal state of the sea ice cover. Article in Journal/Newspaper Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) GEOPHYSICS 81 1 WA45 WA58 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The porosity of sea ice is a fundamental physical parameter that governs the mechanical strength of sea ice and the mobility of gases and nutrients for biological processes and biogeochemical cycles in the sea ice layer. However, little is known about the spatial distribution of the sea ice porosity and its variability between different sea ice types; an efficient and nondestructive method to measure this property is currently missing. Sea ice porosity is linked to the bulk electrical conductivity of sea ice, a parameter routinely used to discriminate between sea ice and seawater by electromagnetic (EM) induction sensors. Here, we have evaluated the prospect of porosity retrieval of sea ice by means of bulk conductivity estimates using 1D multifrequency EM inversion schemes. We have focused on two inversion algorithms, a smoothness-constrained inversion and a Marquardt-Levenberg inversion, which we modified for the nonlinear signal bias caused by a passive bucking coil operated in such a highly conductive environment. Using synthetic modeling studies, 1D inversion algorithms and multiple frequencies, we found that we can resolve the sea ice conductivity within +-0.01 S∕m. Using standard assumptions for the conductivity- porosity relation of sea ice, we were able to estimate porosity with an uncertainty of +-1.2%, which enables efficient and nondestructive surveys of the internal state of the sea ice cover. |
format |
Article in Journal/Newspaper |
author |
Hunkeler, Priska Hendricks, Stefan Hoppmann, Mario Farquharson, Colin Kalscheuer, Thomas Grab, Melchior Kaufmann, Manuela S. Rabenstein, Lasse Gerdes, Rüdiger |
spellingShingle |
Hunkeler, Priska Hendricks, Stefan Hoppmann, Mario Farquharson, Colin Kalscheuer, Thomas Grab, Melchior Kaufmann, Manuela S. Rabenstein, Lasse Gerdes, Rüdiger Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking |
author_facet |
Hunkeler, Priska Hendricks, Stefan Hoppmann, Mario Farquharson, Colin Kalscheuer, Thomas Grab, Melchior Kaufmann, Manuela S. Rabenstein, Lasse Gerdes, Rüdiger |
author_sort |
Hunkeler, Priska |
title |
Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking |
title_short |
Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking |
title_full |
Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking |
title_fullStr |
Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking |
title_full_unstemmed |
Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking |
title_sort |
improved 1d inversions for sea ice thickness and conductivity from electromagnetic induction data: inclusion of nonlinearities caused by passive bucking |
publisher |
Society of Exploration Geophysicists |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/39097/ https://epic.awi.de/id/eprint/39097/1/Hunkeler_Geophysics_2016.pdf https://hdl.handle.net/10013/epic.46334 https://hdl.handle.net/10013/epic.46334.d001 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
EPIC3GEOPHYSICS, Society of Exploration Geophysicists, 81(1), pp. WA45-WA58 |
op_relation |
https://epic.awi.de/id/eprint/39097/1/Hunkeler_Geophysics_2016.pdf https://hdl.handle.net/10013/epic.46334.d001 Hunkeler, P. , Hendricks, S. orcid:0000-0002-1412-3146 , Hoppmann, M. orcid:0000-0003-1294-9531 , Farquharson, C. , Kalscheuer, T. , Grab, M. , Kaufmann, M. S. , Rabenstein, L. and Gerdes, R. (2016) Improved 1D inversions for sea ice thickness and conductivity from electromagnetic induction data: Inclusion of nonlinearities caused by passive bucking , GEOPHYSICS, 81 (1), WA45-WA58 . doi:10.1190/GEO2015-0130.1 <https://doi.org/10.1190/GEO2015-0130.1> , hdl:10013/epic.46334 |
op_doi |
https://doi.org/10.1190/GEO2015-0130.1 |
container_title |
GEOPHYSICS |
container_volume |
81 |
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1 |
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WA45 |
op_container_end_page |
WA58 |
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1810475809065926656 |