Results 141 to 150 of about 1,284 (168)

Sea ice: Multiyear cycles and white ice

Journal of Geophysical Research: Atmospheres, 1985
An interesting feature of previous sea ice modeling studies [Semtner, 1976; Washington et al., 1976] was the multiyear cycles in sea ice thickness despite repeating year to year forcing. It is shown here that a number of factors combine to produce these cycles.
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Feasibility of a Conical Piled Monopod in Multiyear Ice

SNAME 10th International Conference and Exhibition on Performance of Ships and Structures in Ice, 2012
This paper describes the results of a ConocoPhillips sponsored study examining the feasibility of a Conical Piled Monopod (CPM), Figure 1, in about 30m water depth in a multi year ice environment. The CPM concept considered is a standalone pile supported drilling and production structure.
Ravi P. Aurora, Alan Williams, Ricardo Argiolas   +2 more
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The loss of multiyear sea ice in the Arctic

Stephen E L Howell, David G. Babb
exaly   +2 more sources

Seasonal evolution of the albedo of multiyear Arctic sea ice

Journal of Geophysical Research: Oceans, 2002
As part of ice albedo feedback studies during the Surface Heat Budget of the Arctic Ocean (SHEBA) field experiment, we measured spectral and wavelength‐integrated albedo on multiyear sea ice. Measurements were made every 2.5 m along a 200‐m survey line from April through October.
D. K. Perovich, T. C. Grenfell, B. Light, P. V. Hobbs   +3 more
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Theoretical Developments for the Estimation of Multiyear Ice Floe Impacts

Proceedings OCEANS '83, 1983
Many controlling structural and geotechnical design conditions associated with the construction and operation of offshore petroleum production facilities in the Beaufort Sea are highly dependent on the expected impact speeds of multiyear ice floes during the summer months.An idealization of a multiyear ice floe impact is described.
R. Chapman, D. Resio, R. Potter, J. Walden   +3 more
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Multiyear sea ice in the Arctic: Model‐ and satellite‐derived

Journal of Geophysical Research: Oceans, 1990
The behavior of sea ice is a strong function of ice strength which, in the central Arctic, depends on the relative fractions of multiyear and first‐year ice coverage. A dynamic‐thermodynamic sea ice model has been configured to include both multiyear and first‐year ice.
John E. Walsh, H. Jay Zwally
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Optical properties of multiyear and first year sea ice

Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium, 2005
During LEADEX, beam spreading and beam transmission measurements were made on complete ice sheets, and on slabs of ice removed from the ice column with depth below the ice surface using a laser source beneath the ice sheet. The beam spread measurements are reported along with estimates of ice layer extinction and scattering optical properties.
F.J. Tanis, R.G. Onstott
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Time-dependence of sea-ice concentration and multiyear ice fraction in the Arctic Basin

Boundary-Layer Meteorology, 1978
Microwave images of sea ice obtained by Nimbus-5 and the NASA CV-990 airborne laboratory are used to determine the time variation of the sea-ice concentration and multiyear ice fraction within the pack ice in the Arctic Basin. The images, constructed from data acquired from the electrically scanned microwave radiometer, are analyzed for four seasons ...
P. Gloersen, H. J. Zwally, A. T. C. Chang, D. K. Hall, W. J. Campbell, R. O. Ramseier   +5 more
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Controls on Arctic Sea Ice from First-Year and Multiyear Ice Survivability

Journal of Climate, 2011
Abstract Recent observations of Arctic sea ice show that the decrease in summer ice cover over the last few decades has occurred in conjunction with a significant loss of multiyear ice. The transition to an Arctic that is populated by thinner, first-year sea ice has important implications for future trends in area and volume.
Kyle C. Armour, Cecilia M. Bitz, LuAnne Thompson, Elizabeth C. Hunke   +3 more
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Influence of melt ponds on the formation of the multiyear sea ice cover

Oceanology, 2011
The features of the sea ice growing and melting under the modern climatic conditions are considered with the use of the thermodynamic model of sea ice taking into account the seasonal melting and recrystallization of its upper layers. The evolution of the snowy and icy cover for the North Pole geographic point is estimated quantitatively on the basis ...
P. V. Bogorodskii, A. V. Pnyushkov
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