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Current Retroflection from a Slanted Coastline
Anglais
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Recent proxies suggest that, at the end of the last§glacial, there was a significant increase in the§injection of Agulhas rings into the South Atlantic.§This event brought about a dramatic increase in the§salt influx helping to re-start the Atlantic§meridional overturning circulation. Until now the§mechanism through which such large variation in ring§production occurs has not been clear. In this book,§two semi-analytical non-linear models of current§retroflection from non-zonal coastline on the -plane§are developed to explain this phenomenon. The§critical value of the coastline slant is defined,§which implies restricted possibilities for ring§detachment from the retroflection area in the supercritical range of . In the case of Agulhas§region, rings can be injected only if the§retroflection occurs beyond specific latitude where§the angle is critical. This analysis should help in§understanding the regimes of ring shedding by§retroflected currents and should be useful for anyone§studying the dynamics of currents, meridional§overturning cell in the Atlantic and climate dynamics.
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