The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite.

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Presentation transcript:

The Fate of the East Madagascar Current

Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite

Retroflection ?? Series of 6-day composites 12 days apart “Retro-fiction” Quartly, G.D., J.J.H. Buck, M.A. Srokosz and A.C. Coward, 2006, Eddies around Madagascar — the retroflection re-considered, J. Mar. Sys. 63 (3-4) OCCAM Sea Surf. Ht Zero of Wind Stress Curl lies further south No eastward current for it to feed

SIOCC Siedler, G., et al.(2006), Structure and origin of the subtropical South Indian Ocean Countercurrent, Geophys. Res. Lett., 33, L24609 Siedler, G. et al. (2009), Modes of the southern extension of the East Madagascar Current, J. Geophys. Res., 114, C01005

Mean Dynamic Topography Rio, M.H. et al.(2011), New CNES ‐ CLS09 global mean dynamic topography computed from the combination of GRACE data, altimetry, and in situ measurements, J. Geophys. Res., 116, C07018 Schematic of counter-rotating eddies

Surface drifters

Model representation of "SIOCC"

ADCP section

Ship-mounted ADCP moorings

+ Sat imagery CC SST

Comparison with altimetry Velocity (m/s) Jason-1 altimeter

Modes of variation

Summary South Indian Ocean Counter Current In SIO there is a mean eastward flow at ~25˚S Connection to EMC: Some waters from EMC turn back to go east … but does the mean current really exist? … but is that really a “retroflection”?