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  • 1
    Online Resource
    Online Resource
    Role of Ice Dynamics in the Sea Ice Mass Balance
    American Geophysical Union (AGU) ; 2008
    In:  Eos, Transactions American Geophysical Union Vol. 89, No. 50 ( 2008-12-09), p. 515-516
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 89, No. 50 ( 2008-12-09), p. 515-516
    Abstract: Over the past decade, the Arctic Ocean and Beaufort Sea ice pack has been less extensive and thinner than has been observed during the previous 35 years [e.g., Wadhams and Davis , 2000; Tucker et al. , 2001; Rothrock et al. , 1999; Parkinson and Cavalieri , 2002; Comiso , 2002]. During the summers of 2007 and 2008, the ice extents for both the Beaufort Sea and the Northern Hemisphere were the lowest on record. Mechanisms causing recent sea ice change in the Pacific Arctic and the Beaufort Sea are under investigation on many fronts [e.g., Drobot and Maslanik , 2003; Shimada et al. , 2006]; the mechanisms include increased ocean surface warming due to Pacific Ocean water inflow to the region and variability in meteorological and surface conditions. However, in most studies addressing these events, the impact of sea ice dynamics, specifically deformation, has not been measured in detail.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2008EO500003
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
    detail.hit.zdb_id: 24845-9
    detail.hit.zdb_id: 2118760-5
    detail.hit.zdb_id: 240154-X
    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    W.F. Weeks, 2010. On sea ice (with chapter 16 contribution by W.D. Hibler, III). Fairbanks, AK, University of Alaska Press. 664pp. ISBN-10: 1-602230-79-X, ISBN-13: 978-1-602-23079-8, hardback. US$85.
    International Glaciological Society ; 2011
    In:  Journal of Glaciology Vol. 57, No. 201 ( 2011), p. 193-194
    Details
    In: Journal of Glaciology, International Glaciological Society, Vol. 57, No. 201 ( 2011), p. 193-194
    Type of Medium: Online Resource
    ISSN: 0022-1430 , 1727-5652
    URL: Article
    DOI: 10.3189/2011JoG10J155
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2011
    detail.hit.zdb_id: 2140541-4
    SSG: 14
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  • 3
    Online Resource
    Online Resource
    On the uncertainty of sea-ice isostasy
    International Glaciological Society ; 2015
    In:  Annals of Glaciology Vol. 56, No. 69 ( 2015), p. 341-352
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 56, No. 69 ( 2015), p. 341-352
    Abstract: During late winter 2007, coincident measurements of sea ice were collected using various sensors at an ice camp in the Beaufort Sea, Canadian Arctic. Analysis of the archived data provides new insight into sea-ice isostasy and its related R -factor through case studies at three scales using different combinations of snow and ice thickness components. At the smallest scale ( 〈 1 m; point scale), isostasy is not expected, so we calculate a residual and define this as Ж (‘zjey’) to describe vertical displacement due to deformation. From 1 to 10 m length scales, we explore traditional isostasy and identify a specific sequence of thickness calculations which minimize freeboard and elevation uncertainty. An effective solution exists when the R -factor is allowed to vary: ranging from 2 to 12, with mean of 5.17, mode of 5.88 and skewed distribution. At regional scales, underwater, airborne and spaceborne platforms are always missing thickness variables from either above or below sea level. For such situations, realistic agreement is found by applying small-scale skewed ranges for the R -factor. These findings encourage a broader isostasy solution as a function of potential energy and length scale. Overall, results add insight to data collection strategies and metadata characteristics of different thickness products.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/2015AoG69A633
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2015
    detail.hit.zdb_id: 2122400-6
    SSG: 14
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  • 4
    Online Resource
    Online Resource
    Impact of spatial aliasing on sea-ice thickness measurements
    International Glaciological Society ; 2015
    In:  Annals of Glaciology Vol. 56, No. 69 ( 2015), p. 353-362
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 56, No. 69 ( 2015), p. 353-362
    Abstract: We explore spatial aliasing of non-Gaussian distributions of sea-ice thickness. Using a heuristic model and 〉 1000 measurements, we show how different instrument footprint sizes and shapes can cluster thickness distributions into artificial modes, thereby distorting frequency distribution, making it difficult to compare and communicate information across spatial scales. This problem has not been dealt with systematically in sea ice until now, largely because it appears to incur no significant change in integrated thickness which often serves as a volume proxy. Concomitantly, demands are increasing for thickness distribution as a resource for modeling, monitoring and forecasting air–sea fluxes and growing human infrastructure needs in a changing polar environment. New demands include the characterization of uncertainties both regionally and seasonally for spaceborne, airborne, in situ and underwater measurements. To serve these growing needs, we quantify the impact of spatial aliasing by computing resolution error ( E r ) over a range of horizontal scales ( x ) from 5 to 500 m. Results are summarized through a power law ( E r = bx m ) with distinct exponents ( m ) from 0.3 to 0.5 using example mathematical functions including Gaussian, inverse linear and running mean filters. Recommendations and visualizations are provided to encourage discussion, new data acquisitions, analysis methods and metadata formats.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/2015AoG69A644
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2015
    detail.hit.zdb_id: 2122400-6
    SSG: 14
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