Decomposition of surface drifter observations in the Atlantic Ocean

Details Decomposition of surface drifter observations in the Atlantic Ocean Decomposition of surface drifter observations in the Atlantic Ocean

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30noce6l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 14, pp. OCE 6-1, CiteID 1753, DOI 10.1029/2003GL017519

Physics

11

Oceanography: Physical: General Circulation, Oceanography: General: Diurnal, Seasonal, And Annual Cycles, Oceanography: Physical: Instruments And Techniques

Scientific paper

Surface drifter observations are decomposed into mean, seasonal (annual and semiannual) and eddy components via Gauss-Markov estimation. This approach helps separate seasonal fluctuations and mean values in the observationally-sparse tropical and South Atlantic, where monthly mean values cannot be calculated at the spatial scale of the major currents. In some regions, large differences are found between these means and those obtained by simple binned averaging. The differences are attributed to inhomogeneous sampling of seasonal variability, and to the inherent bias of Lagrangian observations towards periods of low velocity. The analysis reveals strong seasonal variations of some surface currents, including a significant late spring reversal of the western North Equatorial Counter-Current.

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