Seasonal variability of QSCAT-derived wind stress over the Southern Ocean

Physics – Geophysics

Scientific paper

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Exploration Geophysics: Remote Sensing, Oceanography: Physical: Air/Sea Interactions (0312), Meteorology And Atmospheric Dynamics: Boundary Layer Processes, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504)

Scientific paper

Seasonal variability of surface wind stress derived from SeaWINDS onboard the NASA's QuikSCAT satellite is mapped over the latitude range 30°-60°S in the Southern Ocean for the period from August 1999 to July 2003. Seasonal variability is pronounced on basin-wide scale which dominates the Atlantic-Indian Ocean sector during austral winter. Harmonic analysis reveals that seasonal harmonic captures larger than 60% of the variance on regional scales. The cyclonic wind stress curl induces divergence around Antarctica and facilitates ACC meandering equatorward in the Atlantic-Indian Ocean sector of the Southern Ocean.

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