Modeling of anisotropic electromagnetic reflection from sea ice, Rep
The contribution of brine layers to observed reflective anisotropy of sea ice at 100 MHz is quan-titatively assessed, and a theoretical explanation for observed reflective anisotropy is proposed in terms of anisotropic electric flux penetration into the brine layers. The sea ice is assumed to be a s...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1980
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.3777 http://www.math.utah.edu/~golden/mypapers/Golden_Ackley_JGR_1981.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.488.3777 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.488.3777 2023-05-15T15:09:40+02:00 Modeling of anisotropic electromagnetic reflection from sea ice, Rep K. M. Golden S. F. Ackley The Pennsylvania State University CiteSeerX Archives 1980 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.3777 http://www.math.utah.edu/~golden/mypapers/Golden_Ackley_JGR_1981.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.3777 http://www.math.utah.edu/~golden/mypapers/Golden_Ackley_JGR_1981.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.math.utah.edu/~golden/mypapers/Golden_Ackley_JGR_1981.pdf Recent studies of arctic fast ice [Cherepanov 1971 Weeks text 1980 ftciteseerx 2016-01-08T08:19:25Z The contribution of brine layers to observed reflective anisotropy of sea ice at 100 MHz is quan-titatively assessed, and a theoretical explanation for observed reflective anisotropy is proposed in terms of anisotropic electric flux penetration into the brine layers. The sea ice is assumed to be a stratified dielec-tric consisting of pure ice containing ellipsoidal conducting inclusions (brine layers) uniformly aligned with their long axes perpendicular to the preferred crystallographic axis direction. The asymmetrical geometry of the brine layers is shown to produce an anisotropy in the complex dielectric constant of sea ice. The contribution of these layers to the reflective anisotropy is examined with a numerical method of approximating the reflected power of a radar pulse incident on a slab of sea ice. Mixture dielectric per-mittivities are calculated for both the electric fields parallel and perpendicular to the c axis direction. These permittivities are then used to calculate power reflection coefficients at each interface in the air/sea ice/sea water system. Significant bottom reflection (R = 0.09) occurs when the polarization is parallel to the c axis. However, when the polarization is perpendicular to the c axis, the return is almost completely extinguished (R < 0.003). This extinction is due primarily to absorptive loss associated with the con-ducting inclusions and secondarily to an impedance match at the ice/water interface that results in trans-mission rather than reflection of the wave. Text Arctic Sea ice Unknown Arctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Recent studies of arctic fast ice [Cherepanov 1971 Weeks |
spellingShingle |
Recent studies of arctic fast ice [Cherepanov 1971 Weeks K. M. Golden S. F. Ackley Modeling of anisotropic electromagnetic reflection from sea ice, Rep |
topic_facet |
Recent studies of arctic fast ice [Cherepanov 1971 Weeks |
description |
The contribution of brine layers to observed reflective anisotropy of sea ice at 100 MHz is quan-titatively assessed, and a theoretical explanation for observed reflective anisotropy is proposed in terms of anisotropic electric flux penetration into the brine layers. The sea ice is assumed to be a stratified dielec-tric consisting of pure ice containing ellipsoidal conducting inclusions (brine layers) uniformly aligned with their long axes perpendicular to the preferred crystallographic axis direction. The asymmetrical geometry of the brine layers is shown to produce an anisotropy in the complex dielectric constant of sea ice. The contribution of these layers to the reflective anisotropy is examined with a numerical method of approximating the reflected power of a radar pulse incident on a slab of sea ice. Mixture dielectric per-mittivities are calculated for both the electric fields parallel and perpendicular to the c axis direction. These permittivities are then used to calculate power reflection coefficients at each interface in the air/sea ice/sea water system. Significant bottom reflection (R = 0.09) occurs when the polarization is parallel to the c axis. However, when the polarization is perpendicular to the c axis, the return is almost completely extinguished (R < 0.003). This extinction is due primarily to absorptive loss associated with the con-ducting inclusions and secondarily to an impedance match at the ice/water interface that results in trans-mission rather than reflection of the wave. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
K. M. Golden S. F. Ackley |
author_facet |
K. M. Golden S. F. Ackley |
author_sort |
K. M. Golden |
title |
Modeling of anisotropic electromagnetic reflection from sea ice, Rep |
title_short |
Modeling of anisotropic electromagnetic reflection from sea ice, Rep |
title_full |
Modeling of anisotropic electromagnetic reflection from sea ice, Rep |
title_fullStr |
Modeling of anisotropic electromagnetic reflection from sea ice, Rep |
title_full_unstemmed |
Modeling of anisotropic electromagnetic reflection from sea ice, Rep |
title_sort |
modeling of anisotropic electromagnetic reflection from sea ice, rep |
publishDate |
1980 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.3777 http://www.math.utah.edu/~golden/mypapers/Golden_Ackley_JGR_1981.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
http://www.math.utah.edu/~golden/mypapers/Golden_Ackley_JGR_1981.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.488.3777 http://www.math.utah.edu/~golden/mypapers/Golden_Ackley_JGR_1981.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766340814193033216 |