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 journalArticlepeer-review

57 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 2007

ASJC Scopus subject areas

  • Ocean Engineering
  • Atmospheric Science

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