Location of Repository

Eddies in the southern Mozambique Channel

By G.D. Quartly and M.A. Srokosz

Abstract

The Agulhas Current system contains one of the world's strongest western boundary currents, and plays an important part in the warm water path of the global thermohaline circulation. However, there have been few surveys of the source regions of the Agulhas Current, and thus little in situ measurement of their variability. Utilizing the more than 5-year record of SeaWiFS data, we examine the eddy activity present in the southern portion of the Mozambique Channel. The two sources of Agulhas input from the central Indian Ocean (southward flow through the Mozambique Channel and westward flow around the southern limit of Madagascar) both show great temporal variability, with no clear seasonal signal. A number of large (-200 km diameter) anticyclonic rings intermittently propagate poleward along the western edge of the channel, sweeping coastal waters into mid channel. Their passage past Maputo appears to affect the circulation of the lee eddy in the Delagoa Bight. The eastern side of the channel is mainly characterized by cyclonic eddies. These are made manifest in the lee of the southern tip of Madagascar, although it is not clear whether many form there or just develop a visible presence due to entrainment of high chlorophyll coastal waters. Several of these cyclonic eddies then appear to move in west-southwesterly direction. The chlorophyll data do reveal the East Madagascar retroflection on occasions, but do not show clear examples of the pinching off of anticyclonic eddies. However surface waters from the East Madagascar Current may reach the African mainland on occasions when no retroflection is present

Topics: GC
Year: 2004
OAI identifier: oai:eprints.soton.ac.uk:810
Provided by: e-Prints Soton

Suggested articles

Preview

Citations

  1. 1988b Remote sensing corroboration of retroflection of the East Madagascar Current. doi
  2. (1985). An intense cyclonic eddy east of the Mozambique Ridge. doi
  3. (2000). An upwelling cell inshore of the East Madagascar Current. doi
  4. (1988). Boundary currents east and north of Madagascar. 2. Direct measurements and model comparisons. doi
  5. (1981). Characteristics of the currents east and south of Madagascar. doi
  6. (1991). Circulation and water properties of the southwest Indian Ocean, spring 1987. Progress in doi
  7. (1987). Cyclogenesis in the Mozambique Ridge Current. doi
  8. (1977). Drift observations from Nimbus VI satellite-tracked buoys in the southwestern Indian Ocean. doi
  9. (2003). Eddies and dipoles around South Madagascar: formation, pathways and large-scale impact. doi
  10. (1997). Eddy activity in the south Indian Ocean from ERS- I altimetry.
  11. (1998). Influence of mesoscale eddies on new production in the Sargasso Sea. doi
  12. (1984). Large vortices in the northern Agulhas Current. doi
  13. (1988). On the role of the East Madagascar Current as a source of the Agulhas Current. doi
  14. (2000). On the surface drift of the East Madagascar and Mozambique Currents.
  15. (1994). Regional oceanography: An introduction. doi
  16. (2003). Rossby waves: Synergy in action. doi
  17. (1988). Satellite altimetry: Observing ocean variability from space. doi
  18. (1993). Seasonal variations in the region of the Agulhas Retroflection: Studies with Geosat and FRAM. doi
  19. (1988). The boundary currents east and north of Madagascar 1. Geostrophic currents and transports. doi
  20. (2000). The calibration and validation of SeaWiFS data. doi
  21. (1984). The circulation of the Mozambique Channel. doi
  22. (1988). The Delagoa Bight eddy. doi
  23. (1997). The flow field of the subtropical gyre of the South Indian Ocean. doi
  24. (1995). The lognormal distribution as a model for bio-optical variability in the sea. doi
  25. (1999). The role of mesoscale eddies in the source regions of the Agulhas Current. doi
  26. (1989). The usefulness of Nimbus CZCS imagery in the south-western Indian Ocean. doi
  27. (2002). TMI observations of the Agulhas and Madagascar retroflections. doi
  28. (1979). Topographically induced changes in the structure of an inertial jet: application to the Agulhas Current, doi
  29. (1995). Tracking eddies in the southeast Atlantic and southwest Indian oceans with TOPEX/POSEIDON. doi
  30. (2000). Upwelling at the inshore edge of the Agulhas Current. doi
  31. (2002). Volume transport and property distributions of the Mozambique Channel. Deep-Sea Research II, doi
  32. (1998). World Ocean Atlas

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.