Results 221 to 230 of about 154,444 (264)
Some of the next articles are maybe not open access.
DRILL FOR DETERMINING THICKNESS OF ICE
Canadian Journal of Research, 1947A device is described for quickly drilling through ice to determine its thickness. It consists of an electric heater mounted at the tip of a rod long enough to penetrate to the desired depth. The unit drills a half inch diameter hole at the rate of about two feet per minute.
openaire +2 more sources
1989
Abstract : Prototype Upward Looking Sonar (ULS) instruments that monitor time series of ice draft from oceanographic moorings have been designed, built, tested and deployed in arctic waters. The measured time series recovered from these instruments reveal many geophysically significant, quantitative aspects of the sea ice draft distribution that have ...
Richard E. Moritz, Norbert Untersteiner
openaire +1 more source
Abstract : Prototype Upward Looking Sonar (ULS) instruments that monitor time series of ice draft from oceanographic moorings have been designed, built, tested and deployed in arctic waters. The measured time series recovered from these instruments reveal many geophysically significant, quantitative aspects of the sea ice draft distribution that have ...
Richard E. Moritz, Norbert Untersteiner
openaire +1 more source
Thickness of ice on perennially frozen lakes
Nature, 1985The dry valleys of southern Victoria Land, constituting the largest ice-free expanse in the Antarctic, contain numerous lakes whose perennial ice cover is the cause of some unique physical and biological properties. Although the depth, temperature and salinity of the liquid water varies considerably from lake to lake, the thickness of the ice cover is
C P, McKay +3 more
openaire +2 more sources
Measuring Ice Thickness with Cygnss Altimetry
IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018Cyclone Global Navigation Satellite System (CYGNSS) is collecting GPS signals reflected from two high altitude lakes with ice cover during Winter 2017–2018. Coherent reflections occur at the ice/water interface and carrier phase altimetry is used to estimate the draft of the ice cover. Simulated data are created using a forward model. Signal processing
David Mayers, Chris Ruf
openaire +1 more source
Estimating the thickness of sea ice
Journal of Geophysical Research: Oceans, 1989Sea ice freeboard, thickness, and snow depth were measured from a series of closely spaced (5 to 10 m) drill hole sites from five free‐floating multiyear ice floes in the Beaufort Sea during the spring of 1986 and 1987. A regression of ice thickness on ice draft was performed on the data from each floe and for the combined data set.
Robert H. Bourke, Robert G. Paquette
openaire +1 more source
Ice Thickness Distribution Test
1998Abstract : Our long term goal is to undertake an experiment that will test the theory of how sea ice thickness distribution is changed by thermodynamics and by large-scale deformation. The minimal experiment envisaged involves two sequential surveys of ice draft in some region by an upward-looking sonar carried on a submarine.
Alan S. Thorndike +2 more
openaire +1 more source
Equilibrium Thickness of Ice Jams
Journal of the Hydraulics Division, 1977By equating the kinetic energy of ice floes carried by a stream to the potential energy they acquire when submerged, a relationship was derived between the mean velocity of the approach flow and the average thickness of the stable ice jam formed only by accumulation and transport of floes.
openaire +1 more source
ARCTIC, 1979
This paper examines how sea ice floes of thickness exceeding 6 m can be formed in the Arctic. Such floes have been observed by a Soviet drifting station, by a submarine at the North Pole, and at three sites in the Canadian Arctic Archipelago. The Maykut and Untersteiner model of sea ice growth predicts an equilibrium thickness of 3 m under normal ...
E.R. Walker, Peter Wadhams
openaire +1 more source
This paper examines how sea ice floes of thickness exceeding 6 m can be formed in the Arctic. Such floes have been observed by a Soviet drifting station, by a submarine at the North Pole, and at three sites in the Canadian Arctic Archipelago. The Maykut and Untersteiner model of sea ice growth predicts an equilibrium thickness of 3 m under normal ...
E.R. Walker, Peter Wadhams
openaire +1 more source
The thickness distribution of sea ice
Journal of Geophysical Research, 1975The polar oceans contain sea ice of many thicknesses ranging from open water to thick pressure ridges. Since many of the physical properties of the ice depend upon its thickness, it is natural to expect its large-scale geophysical properties to depend on the relative abundance of the various ice types.
A. S. Thorndike +3 more
openaire +1 more source