Formation of sea ice bridges in narrow straits in response to wind and water stresses

Rallabandi, Bhargav; Zheng, Zhong; Winton, Michael; Stone, Howard A.

doi:10.1002/2017jc012822

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i

Formation of sea ice bridges in narrow straits in response to wind and water stresses

2017
By Rallabandi, Bhargav ; Zheng, Zhong ; Winton, Michael ; ...
Source: Journal of Geophysical Research: Oceans, 122(7), 5588-5610

[PDF-3.08 MB]

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Details:

Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Rallabandi, Bhargav ; Zheng, Zhong ; Winton, Michael ; Stone, Howard A.

Rallabandi, Bhargav ; Zheng, Zhong ; Winton, Michael ; Stone, Howard A. Less -
NOAA Program & Office:

GFDL (Geophysical Fluid Dynamics Laboratory) ; OAR (Oceanic and Atmospheric Research)

GFDL (Geophysical Fluid Dynamics Laboratory) ; OAR (Oceanic and Atmospheric Research) Less -
Description:

Ice bridges are rigid structures composed of sea ice that form seasonally in the many straits and channels of the Canadian Arctic Archipelago. Driven primarily by atmospheric stresses, these ice bridges are formed when sufficiently thick ice “jams” during the course of its flow between land masses, resulting in a region of stationary compacted ice that is separated from a region of flowing open water (a polynya) by a static arch. Using a continuum description of sea ice that is widely used in climate modeling, we present an asymptotic theory of the process of formation of such bridges in slender channels when the motion of the ice is driven by external wind and water stresses. We show that for an arbitrary channel shape, ice bridges can only form within a range of ice properties that is determined by the channel geometry and the external stress. We then compare the results of our theory with direct numerical simulations and observational evidence. Finally, we provide simple analytical expressions for the mean velocity of the ice flow as a function of the channel shape, the properties of the ice, and the wind and water stresses along the channel.
Keywords:

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Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Oceanography Space And Planetary Science
Source:

Journal of Geophysical Research: Oceans, 122(7), 5588-5610
DOI:

https://doi.org/10.1002/2017jc012822
ISSN:

2169-9275;2169-9291;
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PDF
Publisher:

American Geophysical Union (AGU)
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Journal Article
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urn:sha-512:5bca47cd920d4e38bc5597d8e675f5d4ed9a9f46a9647a4a09623ecb9e2ca0b7ad7fe058988f39748f1a537bca516752ad5fad72f9f820eec68d106443ec4719
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https://repository.library.noaa.gov/view/noaa/63778/noaa_63778_DS1.pdf
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