the fate of the east madagascar current. schematic — avhrr (june 1984) (from lutjeharms, deep sea...
DESCRIPTION
Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl compositeTRANSCRIPT
![Page 1: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/1.jpg)
The Fate of the East Madagascar Current
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![Page 3: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/3.jpg)
Schematic — AVHRR (June 1984)
(from Lutjeharms, Deep Sea Res., 1988)
SeaWiFS 6-day Chl composite
![Page 4: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/4.jpg)
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) 115-129.
OCCAMSea Surf. Ht
Zero of Wind Stress Curl lies further south
No eastward current for it to feed
![Page 5: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/5.jpg)
SIOCC
Siedler, G., et al.(2006), Structure and origin of the subtropical South Indian Ocean Countercurrent, Geophys. Res. Lett., 33, L24609Siedler, G. et al. (2009), Modes of the southern extension of the East Madagascar Current, J. Geophys. Res., 114, C01005
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Mean Dynamic Topography
Rio, M.H. et al.(2011), New CNES‐CLS09 global mean dynamic topography computedfrom the combination of GRACE data, altimetry, and in situ measurements, J. Geophys. Res., 116, C07018
Schematic of counter-rotating eddies
![Page 7: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/7.jpg)
Surface drifters
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Model representation of "SIOCC"
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![Page 10: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/10.jpg)
![Page 11: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/11.jpg)
ADCP section
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Ship-mounted ADCP
moorings
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+ Sat imagery
CC
SST
![Page 14: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/14.jpg)
Comparison with altimetryVe
locit
y (m
/s)
Jason-1 altimeter
![Page 15: The Fate of the East Madagascar Current. Schematic — AVHRR (June 1984) (from Lutjeharms, Deep Sea Res., 1988) SeaWiFS 6-day Chl composite](https://reader036.vdocument.in/reader036/viewer/2022081605/5a4d1ae47f8b9ab05997890b/html5/thumbnails/15.jpg)
Modes of variation
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Summary
South Indian Ocean Counter CurrentIn 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”?