Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3413609i&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 13, CiteID L13609
Physics
Oceanography: General: Marginal And Semi-Enclosed Seas, Oceanography: Physical: Currents, Oceanography: Physical: Hydrography And Tracers
Scientific paper
Lagrangian drifter observations of the Black Sea circulation between 2002 and 2003 show six transitions between two meta-stable states representing single gyre structures centered in either the western or eastern sub-basin of the Black Sea, respectively. The major mechanisms driving such an oscillator dynamics are Ekman pumping for the eastern sub-basin, and most likely a resonance excitation for the western sub-basin. The sea strongly amplifies the wind responses of 120-day periodicity. Data analysis demonstrates that two-gyre structure (``Knipovich spectacles'') was a transient between the states. Residence time for the sea to occupy either state is mainly determined by the instability of the gyres, wind variability and, probably, variations in the pycnocline. This behavior is a manifestation of a bimodal dynamical regime which affects the long-term (climatic), large-scale transport and mixing of bio-geochemical substances.
Collins Curtis A.
Eremeev Valery N.
Ivanov Leonid M.
Melnichenko Oleg V.
Motyzhev Sergey V.
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