Accession Number : ADA547692


Title :   A Combined EOF/Variational Approach for Mapping Radar-Derived Sea Surface Currents


Descriptive Note : Journal article


Corporate Author : NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV


Personal Author(s) : Yaremchuk, Max ; Sentchev, Alexei


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a547692.pdf


Report Date : Jan 2011


Pagination or Media Count : 12


Abstract : A technique for reconstruction of the 2d surface velocity field from radar observations is proposed. The method consecutively employs two processing techniques: At the first stage raw radial velocity data are subject to EOF analysis, which enables to fill gaps in observations and provides estimates of the noise level and integral parameters characterizing small-scale variability of the sea surface circulation. These parameters are utilized at the second stage, when the cost function for variational interpolation is constructed, and the updated radial velocities are interpolated on the regular grid. Experiments with simulated and real data are used to assess the method's skill and compare it with the conventional 2d variational (2dVar) approach. It is shown that the proposed technique consistently improves performance of the 2dVar algorithm and becomes particularly effective when a radar stops operating for 1-2 days and/or a persistent gap emerges in spatial coverage of a basin by the HFR network.


Descriptors :   *OCEAN SURFACE , *RADAR , INTERPOLATION , NOISE , OCEAN CURRENTS , RADIAL VELOCITY , REPRINTS , VARIATIONS


Subject Categories : Physical and Dynamic Oceanography
      Active & Passive Radar Detection & Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE