The Average Shape of Sea Ice Ridge Keels
Through analysis of over 64,000 ridge profiles identified from moored upward-looking sonars, we identify a well-defined average shape of pressure ridge keels that is concave or cusped, not triangular as widely assumed in other literature. On the basis of this average shape, we put forward a new, dim...
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ftosti:oai:osti.gov:1865017 2023-07-30T04:06:46+02:00 The Average Shape of Sea Ice Ridge Keels Metzger, Andrew T. Mahoney, Andrew R. Roberts, Andrew F. 2022-12-05 application/pdf http://www.osti.gov/servlets/purl/1865017 https://www.osti.gov/biblio/1865017 https://doi.org/10.1029/2021gl095100 unknown http://www.osti.gov/servlets/purl/1865017 https://www.osti.gov/biblio/1865017 https://doi.org/10.1029/2021gl095100 doi:10.1029/2021gl095100 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1029/2021gl095100 2023-07-11T10:12:02Z Through analysis of over 64,000 ridge profiles identified from moored upward-looking sonars, we identify a well-defined average shape of pressure ridge keels that is concave or cusped, not triangular as widely assumed in other literature. On the basis of this average shape, we put forward a new, dimensional-definition, of a pressure ridge cross-section that follows a negative exponential form and allows an average pressure ridge cross section to be constructed with knowledge or choice of a single parameter. The horizonal asymptote of the profile represents the draft of the “background” ice in which the ridge is embedded. The draft of this background ice scales with keel depth and is typically greater than can be accounted through thermodynamic growth, indicating that ridges tend to be embedded in fields of mechanically thickened rubble. Using a variational ridge model we simulated keel shapes for a range of ridge building conditions. Here, the model results agree well with the observations and indicate the cusped shape of an average ridge profile arises from the varying angle of horizontal shear in the ice cover when ridges form. The modeling results also explain the elongated tail of the area draft distribution of the pack. Other/Unknown Material Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Geophysical Research Letters 48 24 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Metzger, Andrew T. Mahoney, Andrew R. Roberts, Andrew F. The Average Shape of Sea Ice Ridge Keels |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Through analysis of over 64,000 ridge profiles identified from moored upward-looking sonars, we identify a well-defined average shape of pressure ridge keels that is concave or cusped, not triangular as widely assumed in other literature. On the basis of this average shape, we put forward a new, dimensional-definition, of a pressure ridge cross-section that follows a negative exponential form and allows an average pressure ridge cross section to be constructed with knowledge or choice of a single parameter. The horizonal asymptote of the profile represents the draft of the “background” ice in which the ridge is embedded. The draft of this background ice scales with keel depth and is typically greater than can be accounted through thermodynamic growth, indicating that ridges tend to be embedded in fields of mechanically thickened rubble. Using a variational ridge model we simulated keel shapes for a range of ridge building conditions. Here, the model results agree well with the observations and indicate the cusped shape of an average ridge profile arises from the varying angle of horizontal shear in the ice cover when ridges form. The modeling results also explain the elongated tail of the area draft distribution of the pack. |
author |
Metzger, Andrew T. Mahoney, Andrew R. Roberts, Andrew F. |
author_facet |
Metzger, Andrew T. Mahoney, Andrew R. Roberts, Andrew F. |
author_sort |
Metzger, Andrew T. |
title |
The Average Shape of Sea Ice Ridge Keels |
title_short |
The Average Shape of Sea Ice Ridge Keels |
title_full |
The Average Shape of Sea Ice Ridge Keels |
title_fullStr |
The Average Shape of Sea Ice Ridge Keels |
title_full_unstemmed |
The Average Shape of Sea Ice Ridge Keels |
title_sort |
average shape of sea ice ridge keels |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1865017 https://www.osti.gov/biblio/1865017 https://doi.org/10.1029/2021gl095100 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
http://www.osti.gov/servlets/purl/1865017 https://www.osti.gov/biblio/1865017 https://doi.org/10.1029/2021gl095100 doi:10.1029/2021gl095100 |
op_doi |
https://doi.org/10.1029/2021gl095100 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
24 |
_version_ |
1772819664146006016 |