Download or read book Measurements of Ice Motion in Lake Erie Using Satellite tracked Drifter Buoys written by Joan E. Campbell and published by . This book was released on 1987 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four Argos tracked drifting buoys were used to measure ice movement on lake Erie during the winter of 1984. The observed ice drift speeds averages 8 cm s−1. Speeds as high as 46 cm −1 were measured and 6.5% of all speeds were greater than 20 cm s−1. A comprehensive data set including ice reconnaissance, aerial photographs, and ice thickness measurements was obtained.

Download or read book Measurements of Ice Motion in Lake Erie Using Satellite tracked Drifter Buoys written by Joan E. Campbell and published by . This book was released on 1987 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four Argos tracked drifting buoys were used to measure ice movement on lake Erie during the winter of 1984. The observed ice drift speeds averages 8 cm s−1. Speeds as high as 46 cm −1 were measured and 6.5% of all speeds were greater than 20 cm s−1. A comprehensive data set including ice reconnaissance, aerial photographs, and ice thickness measurements was obtained.

Download or read book A Comparison of Ice Drift Motion from Modeled and Buoy Data written by and published by . This book was released on 1990 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: U.S. Naval operations in the Arctic require an effective way to predict the movement and behavior of sea ice. This is currently provided by the Navy's PIPS model which is based on Hibler's (1979) sea ice model which combines the thermodynamic ice heat budget with a dynamic ice model sensitive to the effects of ice thickness and ice strength. The PIPS model simultaneously solves a system of four equations of ice momentum balance, ice rheology, ice thickness, and ice strength. In order to test the performance of Hibler's formulation, another version of it, developed by Lemke et al., (1990), was adapted to the Arctic Ocean. The model was initialized and run using 1986 forcing data and its performance evaluated using Arctic buoy drift data. Results indicate that the model ice drift is principally driven by wind forcing, that its response to changes in weather is rapid and essentially correct, and that it performs better at high wind speeds than at low wind speeds. Limitations to its accuracy were chiefly the result of limits to the precision and resolution of the input data provided to run the model, especially near the ice margins. Overall, the model performs well in depicting the ice flow pattern in all conditions in the Arctic.

Download or read book NOAA Data Report ERL GLERL written by and published by . This book was released on 1979 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Drift of Sea Ice written by Matti Leppäranta and published by Springer Science & Business Media. This book was released on 2011-03-22 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second Edition of The Drift of Sea Ice presents the fundamental laws of sea ice drift which come from the material properties of sea ice and the basic laws of mechanics. The resulting system of equations is analysed for the general properties of sea ice drift, the free drift model and analytical models for ice drift in the presence of internal friction, and the construction of numerical ice drift models is detailed. This second edition of a much lauded work, unique on this topic in the English language, has been revised, updated and expanded with much new information and outlines recent results, in particular in relation to the climate problem, mathematical modelling and ice engineering applications. The current book presents the theory, observations, mathematical modelling techniques, and applications of sea ice drift science. The theory is presented from the beginning on a graduate student level, so that students and researchers coming from other fields such as physical oceanography, meteorology, physics, engineering, environmental sciences or geography can use the book as a source book or self-study material. First the drift ice material is presented ending with the concept of ‘ice state’ – the relevant properties in sea ice dynamics. Ice kinematics observations are widely presented with the mathematical analysis methods, and thereafter come drift ice rheology – to close the triangle material – kinematics – stress. The momentum equation of sea ice is derived in detail and its general properties are carefully analysed. Then follow two chapters on analytical models: free drift and drift in the presence of internal friction: These are very important tools in understanding the dynamical behaviour of sea ice. The last topical chapter is numerical models, which are the modern tool to solve ice dynamics problem in short term and long term problems. The closing chapter summarises sea ice dynamics applications and the need of sea ice dynamic knowledge and gives some final remarks on the future of this branch of science.

Download or read book The Drift of Sea Ice written by Matti Leppäranta and published by Springer Science & Business Media. This book was released on 2005 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author presents in The Drift of Sea Ice the fundamental laws of sea ice drift which come from the material properties of sea ice and the basic laws of mechanics. The resulting system of equations is analysed for the general properties of sea ice drift, the free drift model and analytical models for ice drift in the presence of internal friction, and the construction of numerical ice drift models is detailed. The science of sea ice drift through its 100-year history to the present day is explained. The text includes the geophysical theory, observations from field programs, and mathematical models. Topics covered include the science of sea ice drift, forecasting drift velocity based on volume, size and shape, sea ice ridging and remote sensing, modelling of the ice conditions, and finally the role of sea ice drift in research fields in ice-covered seas, oceanography, marine ecology and engineering.

Download or read book An Ice Drift Measurement in Western Parry Channel written by Canada. Defence Research Board and published by Reprinted from ARCTIC, Journal of the Arctic Institute of North America, Volume 27, Number 1, March 1974.. This book was released on 1974 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description is given of the drift of ice in Western Parry Channel during the spring and summer of 1970. Ice-buoys, planted in the fast ice of this region in April 1970, were located at approximately two-week intervals by Canadian Forces aircraft overflights. The ice in M'Clure Strait drifted to the west, whereas in Viscount Melville Sound the ice drift seemed to have no definite trend. The drift after the middle of July when the ice was broken was compared to the ice motion calculated using Zubov's rule. The comparison yields a respectable agreement. Also, information pertaining to the longevity of ice-buoys in both polar and winter ice is given. (Author).

Download or read book Measurements of Sea Ice Motion Determined from OCS Data Buoys October 1975 to December 1976 written by Alan S. Thorndike and published by . This book was released on 1977 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: "During 1975 and 1976 measurements of sea ice motion were made as part of AIDJEX, and the Outer Continental Shelf project. The raw data from the 20 platforms deployed in the continental shelf region have been edited and interpolated for presentation in this report"--Leaf 1.

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 1240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Winter Ice Motion in the Southern Beaufort Sea from RAMS Buoy Data Analysis 1975 1978 written by David McGonigal and published by . This book was released on 1980 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Significant oil and gas discoveries in the Southern Canadian Beaufort Sea have given new impetus to development schemes for the area. ... The most recent discoveries have been in the 30-100 metre water depth range, which lies beneath the zone of moving pack ice. Since 1975, winter ice movement in this zone has been monitored by several agencies using satellite-reporting RAMS ice tracking buoys. Data from 20 buoys which have drifted across the area have been compiled. ... In this paper, samples of drift tracks and daily ice movement statistics are presented, the data from the three winters is summarized, and the application of this data to oil industry requirements are discussed particularly with reference to engineering design and the fate of an oil spill in moving ice"--Page 1.

Download or read book Sea Ice Motions in the Central Arctic Pack Ice as Inferred from Avhrr Imagery written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synoptic observations of ice motion in the Arctic Basin are currently limited to those acquired by drifting buoys and, more recently, radar data from ERS-1. Buoys are not uniformly distributed throughout the Arctic, and SAR coverage is currently limited regionally and temporally due to the data volume, swath width, processing requirements, and power needs of the SAR. Additional ice-motion observations that can map ice responses simultaneously over large portions of the Arctic on daily to weekly time intervals are thus needed to augment the SAR and buoys data and to provide an intermediate-scale measure of ice drift suitable for climatological analyses and ice modeling. Principal objectives of this project were to: (1) demonstrate whether sufficient ice features and ice motion existed within the consolidated ice pack to permit motion tracking using AVHRR imagery; (2) determine the limits imposed on AVHRR mapping by cloud cover; and (3) test the applicability of AVHRR-derived motions in studies of ice-atmosphere interactions. Each of these main objectives was addressed. We conclude that AVHRR data, particularly when blended with other available observations, provide a valuable data set for studying sea ice processes. In a follow-on project, we are now extending this work to cover larger areas and to address science questions in more detail. Emery, William and Maslanik, James and Fowler, Charles Unspecified Center NAGW-2948...

Download or read book Host Bibliographic Record for Boundwith Item Barcode 30112050443578 and Others written by and published by . This book was released on 2013 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oceans 89 Navigation remote sensing underwater vehicles written by and published by . This book was released on 1989 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by and published by . This book was released on 1989 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oceans 89 Fisheries global ocean studies marine policy education oceanographic studies written by and published by . This book was released on 1989 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sea Ice Velocity Fields Off Labrador and Eastern Newfoundland Derived from Satellite Imagery 1984 87 written by and published by . This book was released on 1990 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1985, a 5-year program was initiated to monitor ice drift off Labrador and eastern Newfoundland using satellite-tracked ice beacons, in order to study the variability of ice drift, and to obtain data for the development and testing of predictive models of ice motion and distribution. While ice beacons provide continuous time series of ice velocity for individual ice floes, spatial and temporal resolution is limited by the low number of beacons deployed. A second method of obtaining ice drift data is by tracking ice features in sequential satellite images using NOAA/AVHRR imagery. Digital NOAA/AVHRR data for the Canadian east coast region have been archived since January 1984, for about one pass per day, at 1800 Z. This report presents ice velocity fields derived from satellite images one day apart for the winters of 1984-87. Ice velocities from the imagery are compared with those obtained from the ice beacons during the last 3 winters (1985-87). Finally, a short analysis of the effect of geostrophic wind on ice velocities obtained using each method is presented.

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1989 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: