Results 181 to 190 of about 35,654 (218)
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Pack-ice studies in the Arctic Ocean
Journal of Geophysical Research, 1959The annual stratification of pack ice has been examined. Summer layers are formed either by arrested growth or by thin layers of fresh-water ice. The crystal structure and the salt content of the ice reflect the seasonal cycle. During the growth of ice a pronounced orientation of crystalline structure develops; it is determined by vertical as well as ...
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Low‐frequency vibrational motion of Arctic pack ice
Journal of Geophysical Research: Oceans, 1992The mechanisms responsible for vibrational motions of Arctic ice at frequencies below about 100 Hz are know to be a combination of wave types, namely, gravity waves, flexural waves, and a variety of acoustic and/or elastic waves. Surface motion measurements using geophones and accelerometers on multiyear pack ice are used to establish the energy level ...
R. L. DiMarco, J. P. Dugan, W. W. Martin
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Airborne laser profiling of the arctic pack ice
Remote Sensing of Environment, 1971Abstract Since 1964, airborne experiments over the Arctic pack ice have been conducted, on an opportunity basis, to test and evaluate the usefulness of various remote sensing systems for mapping and measuring sea ice conditions and features. This paper describes the results of an analysis of laser terrain profile data obtained with coincident ...
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Sea-ice algae in Arctic pack ice during late winter
Polar Biology, 2007Pack ice around Svalbard was sampled during the expedition ARK XIX/1 of RV “Polarstern” (March–April 2003) in order to determine environmental conditions, species composition and abundances of sea-ice algae and heterotrophic protists during late winter. As compared to other seasons, species diversity of algae (total 40 taxa) was not low, but abundances
Johanna Ikävalko +2 more
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Underwater Backscattering Strengths of Arctic Pack Ice
The Journal of the Acoustical Society of America, 1964The backscattering strengths under Arctic sea ice for octave bands between 12 cps and 4 kc/sec were measured, using explosive sound sources. The measurements were made from a camp established in April 1962 on broken and pressure-packed one-year ice over the Canada Deep.
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Studies of the Solar and Terrestrial Radiation Fluxes over Arctic Pack Ice [PDF]
, 1970 Abstract : The report describes some measurements carried out during 1972 AIDJEX that have not been accounted for in earlier reports under this contract. Determinations of the turbidity coefficient gave a mean value of 0-078, indicating that the dust scattering is considerable in the Arctic atmosphere.
Gunter Weller, Bjorn Holmgren
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Near-Field Ice Management Tactics for Floating Drilling in Arctic Pack Ice
All Days, 2016Abstract In order to be economically viable, Arctic floating drilling in high concentration pack ice requires very high confidence that ice interaction does not lead to costly, unanticipated emergency disconnections of the rig from the well.
Curtis Holub +6 more
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The Influence of the Arctic Pack Ice on Climate
1968An assessment is made of each component of the heat budgets of the surface and of the earth-atmosphere system in the central Arctic, both for an ice-covered ocean and for an ice-free ocean. The annual patterns of atmospheric heat loss for both conditions are obtained as residuals; the relation of these patterns to general atmospheric circulation and ...
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Observations of internal gravity waves under the Arctic pack ice
Journal of Geophysical Research: Oceans, 1987Internal gravity waves measured under the Arctic pack ice were strikingly different from measurements at lower latitudes. The total wave energy, integrated over the internal wave frequency band, was lower by a factor of 0.03–0.07, and the spectral slope at high frequency was nearly −1 in contrast to the − 2 observed at lower latitudes.
Murray D. Levine +2 more
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The Effect of Tensile Strength in the Arctic Ice Pack
2001The ice pack covering northern seas is composed of an aggregate of thick ridged and rafted ice, undeformed ice, and open water. Existing ice-ocean models of the Arctic ice pack are large-scale continuum models that use a plastic yield surface to characterize the constitutive behavior of the pack. An alternative approach, which captures far more detail,
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