HR: 10:35h
AN: OS52A-02    [Abstracts]
TI: Assimilation of High-Frequency Radar Currents in a Nested Model of the West Florida Shelf
AU: * Barth, A
AF: University of South Florida, 140 Seventh Avenue South, St. Petersburg, FL 33701, United States
AU: Alvera-Azcarate, A
AF: University of South Florida, 140 Seventh Avenue South, St. Petersburg, FL 33701, United States
AU: Weisberg, R H
AF: University of South Florida, 140 Seventh Avenue South, St. Petersburg, FL 33701, United States
AB: High-Frequency Radar Currents are assimilated in a West Florida Shelf (WFS) model based on the Regional Ocean Model System (ROMS) which is nested in the Atlantic Hybrid Coordinate Ocean Model (HYCOM) to include both local and deep-ocean forcing, particularly the Gulf of Mexico Loop Current (LC). An ensemble simulation of the WFS ROMS model is carried out under different wind forcings in order to estimate the error covariance of the model state vector and the covariance between ocean currents and winds. Radial currents measured by HF-Radar antennas near St. Petersburg and Venice, FL, are assimilated using this ensemble-based error covariance. Different assimilation techniques using a time-average ensemble, a filter to reduce surface-gravity waves and an extended state vector including wind stress were tested. Results of WFS ROMS model assimilating surface currents show an improvement of the model currents not only at the surface but also at depth.
DE: 4200 OCEANOGRAPHY: GENERAL
DE: 4219 Continental shelf and slope processes (3002)
DE: 4255 Numerical modeling (0545, 0560)
DE: 4260 Ocean data assimilation and reanalysis (3225)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting