Current patterns on the West Florida shelf from joint self-organizing map analyses of HF radar and ADCP data

Yonggang Liu, Robert H. Weisberg, Lynn K. Shay

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

To assess the spatial structures and temporal evolutions of distinct physical processes on the West Florida Shelf, patterns of ocean current variability are extracted from a joint HF radar and ADCP dataset acquired from August to September 2003 using Self-Organizing Map (SOM) analyses. Three separate ocean-atmosphere frequency bands are considered: semidiurnal, diurnal, and subtidal. The currents in the semidiurnal band are relatively homogeneous in space, barotropic, clockwise polarized, and have a neap-spring modulation consistent with semidiurnal tides. The currents in the diurnal band are less homogeneous, more baroclinic, and clockwise polarized, consistent with a combination of diurnal tides and near-inertial oscillations. The currents in the subtidal frequency band are stronger and with more complex patterns consistent with wind and buoyancy forcing. The SOM is shown to be a useful technique for extracting ocean current patterns with dynamically distinctive spatial and temporal structures sampled by HF radar and supporting in situ measurements.

Original languageEnglish (US)
Pages (from-to)702-712
Number of pages11
JournalJournal of Atmospheric and Oceanic Technology
Volume24
Issue number4
DOIs
StatePublished - Apr 1 2007

ASJC Scopus subject areas

  • Ocean Engineering
  • Atmospheric Science

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