Accession Number : ADA328543

Title :   Method for Extracting Tidal and Inertial Motion from ARGOS Ice Buoys Applied to the Barents Sea during CEAREX.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION SEATTLE WA PACIFIC MARINE ENV IRONMENTAL LABS

Personal Author(s) : Turet, P. ; Pease, C. H. ; Pritchard, R. S. ; Overland, J. E.

PDF Url : ADA328543

Report Date : APR 1993

Pagination or Media Count : 68

Abstract : A harmonic analysis of tidal and inertial action was applied to observations of position of ARGOS buoys deployed on drifting multiyear sea ice in the Eastern Arctic-Barents Sea during CEAREX (1988-89). An ARGOS positioning-data screening protocol was developed and constructed using a constrained least squares algorithm for separate estimation of tidal and inertial currents. The analysis provided estimates of individual tidal components at 15-day intervals along the sea ice buoy drift tracks. The technique shows a reasonable qualitative distinction in current components at nearby semi-diurnal frequencies. Estimates of errors due to sampling and collinearity are derived directly from model statistics. Estimates of velocity produced from the unequally time-based data are then used for interpolation to a regular time grid for spectral analysis. Computed velocities (up to 70 ca s-I for M2 tidal notion over Spitsbergen Bank southeast of Svalbard) are in close agreement with the regional tidal model of Gjevik, et al. (1990, 1993).

Descriptors :   *TIDAL CURRENTS, VELOCITY, ALGORITHMS, DEPLOYMENT, GRIDS, STATISTICS, MOTION, ESTIMATES, DRIFT, ICE, ERRORS, INTERPOLATION, LEAST SQUARES METHOD, ARTIFICIAL SATELLITES, SAMPLING, EXTRACTION, INERTIAL SYSTEMS, BARENTS SEA, SPECTRUM ANALYSIS, CURRENTS, SEA ICE, BUOYS, HARMONIC ANALYSIS.

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE