Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice
In this article we explore simulated responses of electromagnetic (EM) signals relative to in situ field surveys and quantify the effects that different values of conductivity in sea ice have on the EM fields. We compute EM responses of ice types with a three-dimensional (3-D) finite-volume discreti...
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ftosti:oai:osti.gov:1235365 2023-07-30T04:06:44+02:00 Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice Samluk, Jesse P. Geiger, Cathleen A. Weiss, Chester J. Kolodzey, James 2016-10-03 application/pdf http://www.osti.gov/servlets/purl/1235365 https://www.osti.gov/biblio/1235365 https://doi.org/10.3189/2015AoG69A737 unknown http://www.osti.gov/servlets/purl/1235365 https://www.osti.gov/biblio/1235365 https://doi.org/10.3189/2015AoG69A737 doi:10.3189/2015AoG69A737 58 GEOSCIENCES 2016 ftosti https://doi.org/10.3189/2015AoG69A737 2023-07-11T09:04:36Z In this article we explore simulated responses of electromagnetic (EM) signals relative to in situ field surveys and quantify the effects that different values of conductivity in sea ice have on the EM fields. We compute EM responses of ice types with a three-dimensional (3-D) finite-volume discretization of Maxwell's equations and present 2-D sliced visualizations of their associated EM fields at discrete frequencies. Several interesting observations result: First, since the simulator computes the fields everywhere, each gridcell acts as a receiver within the model volume, and captures the complete, coupled interactions between air, snow, sea ice and sea water as a function of their conductivity; second, visualizations demonstrate how 1-D approximations near deformed ice features are violated. But the most important new finding is that changes in conductivity affect EM field response by modifying the magnitude and spatial patterns (i.e. footprint size and shape) of current density and magnetic fields. These effects are demonstrated through a visual feature we define as 'null lines'. Null line shape is affected by changes in conductivity near material boundaries as well as transmitter location. Our results encourage the use of null lines as a planning tool for better ground-truth field measurements near deformed ice types. Other/Unknown Material Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Annals of Glaciology 56 69 405 414 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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58 GEOSCIENCES |
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58 GEOSCIENCES Samluk, Jesse P. Geiger, Cathleen A. Weiss, Chester J. Kolodzey, James Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice |
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58 GEOSCIENCES |
description |
In this article we explore simulated responses of electromagnetic (EM) signals relative to in situ field surveys and quantify the effects that different values of conductivity in sea ice have on the EM fields. We compute EM responses of ice types with a three-dimensional (3-D) finite-volume discretization of Maxwell's equations and present 2-D sliced visualizations of their associated EM fields at discrete frequencies. Several interesting observations result: First, since the simulator computes the fields everywhere, each gridcell acts as a receiver within the model volume, and captures the complete, coupled interactions between air, snow, sea ice and sea water as a function of their conductivity; second, visualizations demonstrate how 1-D approximations near deformed ice features are violated. But the most important new finding is that changes in conductivity affect EM field response by modifying the magnitude and spatial patterns (i.e. footprint size and shape) of current density and magnetic fields. These effects are demonstrated through a visual feature we define as 'null lines'. Null line shape is affected by changes in conductivity near material boundaries as well as transmitter location. Our results encourage the use of null lines as a planning tool for better ground-truth field measurements near deformed ice types. |
author |
Samluk, Jesse P. Geiger, Cathleen A. Weiss, Chester J. Kolodzey, James |
author_facet |
Samluk, Jesse P. Geiger, Cathleen A. Weiss, Chester J. Kolodzey, James |
author_sort |
Samluk, Jesse P. |
title |
Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice |
title_short |
Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice |
title_full |
Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice |
title_fullStr |
Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice |
title_full_unstemmed |
Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice |
title_sort |
full-physics 3d heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice |
publishDate |
2016 |
url |
http://www.osti.gov/servlets/purl/1235365 https://www.osti.gov/biblio/1235365 https://doi.org/10.3189/2015AoG69A737 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
http://www.osti.gov/servlets/purl/1235365 https://www.osti.gov/biblio/1235365 https://doi.org/10.3189/2015AoG69A737 doi:10.3189/2015AoG69A737 |
op_doi |
https://doi.org/10.3189/2015AoG69A737 |
container_title |
Annals of Glaciology |
container_volume |
56 |
container_issue |
69 |
container_start_page |
405 |
op_container_end_page |
414 |
_version_ |
1772819622944309248 |