Modeling the variability of the greater Agulhas Current system

Journal of Climate

Volumn 20, Issue 13, 2007, Pages 3131-3146

  Hermes, J C ^a   Reason, C J C ^a   Lutjeharms, J R E ^a  

^a UNIVERSITY OF CAPE TOWN   (South Africa)

Author keywords

[No Author keywords available]

Indexed keywords

COMPUTER SIMULATION; FLOW OF WATER; HYDRODYNAMICS; TEMPERATURE DISTRIBUTION; WIND EFFECTS;

OCEAN MODEL; OCEAN RECIRCULATION; RETROFLECTION INDEX;

OCEAN CURRENTS;

ANNUAL CYCLE; CIRCULATION MODELING; EDDY; EQUATORIAL DYNAMICS; GYRE; VOLUME TRANSPORT; WIND FORCING; WIND-DRIVEN CIRCULATION; WIND-DRIVEN CURRENT; ZONAL WIND;

AGULHAS CURRENT; INDIAN OCEAN; INDIAN OCEAN (SOUTHWEST); MOZAMBIQUE CHANNEL;

EID: 34547125786     PISSN: 08948755     EISSN: None     Source Type: Journal    
DOI: 10.1175/JCLI4154.1     Document Type: Conference Paper

References (58)

1. Barnier, B., L. Siefridt, and P. Marcheseillo, 1995: Thermal forcing for a global ocean circulation model using a three-year climatology of ECMWF analyses. J. Mar. Syst., 6, 363-380.
2. Biastoch, A., 1998: Zirkulation und Dynamik in der Agulhas-region anhand eines numerischen modells (Circulation and dynamics in the Agulhas regio with the aid of a numerical model). Ph.D. thesis, Institut für Meereskunde an der Christian-Albrechts Univeristät, Kiel, Germany, 118 pp.
3. Biastoch, A., and W. Krauß, 1999: The role of mesoscale eddies in the source regions of the Agulhas Current. J. Phys. Oceanogr., 29, 2303-2317.
4. Biastoch, A., C. J. C. Reason, J. R. E. Lutjeharms, and O. Boebel, 1999: The importance of the Mozambique Channel for the seasonality of the Agulhas Current. Geophys. Res. Lett., 26, 3321-3324.
5. Boebel, O., J. R. E. Lutjeharms, C. Schmid, W. Zenk, H. T. Rossby, and C. Barron, 2003: The Cape cauldron: A regime of turbulent inter-ocean exchange. Deep-Sea Res. II, 50, 57-86.
6. Bryden, H. L., L. M. Beal, and L. M. Duncan, 2005: Structure and transport of the Agulhas current and its temporal variability. J. Oceanogr., 61, 479-492.
7. Crimp, S. J., J. R. E. Lutjeharms, and S. J. Mason, 1998: Sensitivity of a tropical-temperate trough to sea-surface temperature anomalies in the Agulhas retroflection region. Water South Afr., 24, 93-100.
8. Daubechies, I., 1992: Ten Lectures on Wavelets. CBMS-NSF Regional Conference Series in Applied Mathematics, Vol. 16, Society for Industrial and Applied Mathematics Press, 357 pp.
9. de Ruijter, W. P. M., A. Biastoch, S. S. Drijfhout, J. R. E. Lutjeharms, R. P. Matano, T. Pichevin, P. J. van Leeuwen, and W. Weijer, 1999: Indian-Atlantic inter-ocean exchange: Dynamics, estimation and impact. J. Geophys. Res., 104, 20 885-20 911.
10. de Ruijter, W. P. M., H. Ridderinkhof, J. R. E. Lutjeharms, M. W. Schouten, and C. Veth, 2002: Observations of the flow in the Mozambique Channel. Geophys. Res. Lett., 29, 1502, doi:10.1029/ 2001GL013714.
11. de Ruijter, W. P. M., H. M. van Aken, E. J. Beier, J. R. E. Lutjeharms, R. P. Matano, and M. W. Schouten, 2004: Eddies and dipoles around South Madagascar: Formation, pathways and large-scale impact. Deep-Sea Res. I, 51, 383-400.
12. Dijkstra, H. A., and W. P. M. de Ruijter, 2001: On the physics of the Agulhas Current: Steady state regimes. J. Phys. Oceanogr., 31, 2971-2985.
13. DiMarco, S. F., P. Chapman, and W. D. Nowlin Jr., 2000: Satellite observations of upwelling on the continental shelf south of Madagascar. Geophys. Res. Lett., 27, 3965-3968.
14. Donohue, K. A., and J. M. Toole, 2003: A near-synoptic survey of the southwest Indian Ocean. Deep-Sea Res. II, 20, 1893-1931.
15. Godfrey, J. S., 1989: A Sverdrup model of the depth-integrated flow for the World Ocean allowing for island circulations. Geophys. Astrophys. Fluid Dyn., 45, 89-112.
16. Gordon, A. L., J. R. E. Lutjeharms, and M. Gründlingh, 1987: Stratification and circulation at the Agulhas retroflection. Deep Sea Res., 34A, 565-599.
17. Gründlingh, M. L., 1995: Tracking eddies in the southeast Atlantic and southwest Indian Oceans with TOPEX/POSEIDON. J. Geophys. Res., 100, 24 977-24 986.
18. Hermes, J. C., 2005: Ocean model diagnosis of variability in the South Indian Ocean. Ph.D. thesis, University of Cape Town, Rondebosch, South Africa, 196 pp.
19. Hermes, J. C., and C. J. C. Reason, 2005: Ocean model diagnosis of interannual coevolving SST variability in the south Indian and Atlantic Oceans. J. Climate, 18, 2864-2882.
20. Heywood, K. J., and Y. K. Somayajulu, 1997: Eddy activity in the South Indian Ocean from ERS-1 altimetry. Proc. Third ERS Symp. on Space in the Service of Our Environment, ESA SP-414, Florence, Italy, European Space Agency, 1479-1483.
21. Jochum, M., and R. Murtugudde, 2005: Internal variability of Indian Ocean SST. J. Climate, 18, 3726-3738.
22. Levitus, S., and T. Boyer, 1994: Temperature. Vol. 4, World Ocean Atlas 1994, NOAA Atlas NESDIS 4, 117 pp.
23. Levitus, S., R. Burgett, and T. P. Boyer, 1994: Salinity. Vol. 3, World Ocean Atlas 1994, NOAA Atlas NESDIS 3, 99 pp.
24. Lutjeharms, J. R. E., 1988a: Remote sensing corroboration of retroflection of the East Madagascar Current. Deep-Sea Res., 35, 2045-2050.
25. Lutjeharms, J. R. E., 1988b: On the role of the East Madagascar Current as a source of the Agulhas Current. South Afr. J. Sci., 84, 236-238.
26. Lutjeharms, J. R. E., 1996: The exchange of water between the south Indian and the South Atlantic. The South Atlantic: Present and Past Circulation, G. Wefer et al., Eds., Springer-Verlag, 125-162.
27. Lutjeharms, J. R. E., and H. R. Roberts, 1988: The Natal pulse; an extreme transient on the Agulhas Current. J. Geophys. Res., 93, 631-635.
28. Lutjeharms, J. R. E., and R. C. van Ballegooyen, 1988: Anomalous upstream retroflection in the Agulhas Current. Science, 240, 1770-1772.
29. Lutjeharms, J. R. E., and E. Machu, 2000: An upwelling cell inshore of the East Madagascar Current. Deep-Sea Res. I, 47, 2405-2411.
30. Lutjeharms, J. R. E., and I. J. Ansorge, 2001: The Agulhas return current. J. Mar. Syst., 30, 115-138.
31. Lutjeharms, J. R. E., N. D. Bang, and C. P. Duncan, 1981: Characteristics of the currents east and south of Madagascar. Deep-Sea Res., 28, 879-899.
32. Lutjeharms, J. R. E., P. M. Wedepohl, and J. M. Meeuwis, 2000: On the surface drift of the East Madagascar and Mozambique Currents. South Afr. J. Sci., 96, 141-147.
33. Matano, R. P., and E. J. Beier, 2003: A kinematic analysis of the Indian/ Atlantic interocean exchange. Deep-Sea Res. II, 50, 229-249.
34. Matano, R. P., C. G. Simionato, W. P. de Ruijter, P. J. van Leeuwen, P. T. Strub, D. B. Chelton, and M. G. Schlax, 1998: Seasonal variability in the Agulhas retroflection region. Geophys. Res. Lett., 25, 4361-4364.
35. Matano, R. P., C. G. Simionato, and P. T. Strub, 1999: Modeling the wind-driven variability of the South Indian Ocean. J. Phys. Oceanogr., 29, 217-230.
36. Matano, R. P., E. J. Beier, P. T. Strub, and R. Tokmakian, 2002: Large-scale forcing of the Agulhas variability: The seasonal cycle. J. Phys. Oceanogr., 32, 1228-1241.
37. Meyers, S. D., B. G. Kelly, and J. J. O'Brien, 1993: An introduction to wavelet analysis in oceanography and meteorology: With application to the dispersion of Yanai waves. Mon. Wea. Rev., 121, 2858-2866.
38. Molinari, R. L., R. Lusic, S. L. Garzoli, M. O. Baringer, and G. Goni, 2002: Benchmarks for Atlantic Ocean circulation. CLIVAR Exchanges, No. 25, International CLIVAR Project Office, Southampton, United Kingdom, 6-9. [Available online at http://eprints.soton.ac.uk/19304/01/ ex25.pdf.]
39. Morlet, J., 1983: Sampling theory and wave propagation. Acoustic Signal/Image Processing and Recognition, C. H. Chen, Ed., NATO ASI Series, Vol. F1, Springer, 233-261.
40. Pacanowski, R. C., 1996: MOM2 version 2: Documentation, user's guide and reference manual. GFDL Tech. Note 3.2, 329 pp.
41. Preston-Whyte, R. A., and P. D. Tyson, 1988: The Atmosphere and Weather of Southern Africa. Oxford University Press, 374 pp.
42. Quartly, G. D., and M. A. Srokosz, 1993: Seasonal variations in the region of the Agulbas retroflection: Studies with Geosat and FRAM. J. Phys. Oceanogr., 23, 2107-2124.
43. Reason, C. J. C., 1998: Warm and cold events in the southeast Atlantic/ sout,hwest Indian Ocean region and potential impacts on circulation and rainfall over southern Africa. Meteor. Atmos. Phys., 69, 49-65.
44. Reason, C. J. C., and J. R. E. Lutjeharms, 1998: Variability of the South Indian Ocean and implications for southern African rainfall. South Afr. J. Sci., 94, 115-123.
45. Reason, C. J. C., and H. Mulenga, 1999: Relationships between South African rainfall and SST anomalies in the southwest Indian Ocean. Int. J. Climatol., 19, 1651-1673.
46. Reason, C. J. C., J. R. E. Lutjeharms, J. Hermes, A. Biastoch, and R. E. Roman, 2003: Inter-ocean fluxes south of Africa in an eddy-permitting model. Deep-Sea Res. II, 50, 281-298.
47. Ridderinkhof, H., and W. P. H. de Ruijter, 2003: Moored current observations in the Mozambique Channel. Deep-Sea Res. II, 50, 1933-1955.
48. Risien, C. M., C. J. C. Reason, F. A. Shillington, and D. B. Chelton, 2004: Variability in satellite winds over the Benguela upwelling system during 1999-2000. J. Geophys. Res., 109, C03010, doi:10.1029/2003JC001880.
49. Sætre, R., and A. Jorge da Silva, 1984: The circulation of the Mozambique Channel. Deep Sea Res., 31A, 485-508.
50. Schouten, M. W., W. P. M. de Ruijter, and P. J. van Leeuwen, 2002a: Upstream control of the Agulhas ring shedding. J. Geophys. Res., 107, 3109, doi:10.1029/2001JC000804.
51. Schouten, M. W., W. P. M. de Ruijter, P. J. van Leeuwen, and H. A. Dijkstra, 2002b: An oceanic teleconnection between the equatorial and southern Indian Ocean. Geophys. Res. Lett., 29, 1812, doi:10.1029/2001GL014542.
52. Schouten, M. W., W. P. M. de Ruijter, P. J. van Leeuwen, and H. Ridderinkhof, 2003: Eddies and variability in the Mozambique Channel. Deep-Sea Res. II, 50, 1987-2003.
53. Semtner, A. J., Jr., and R. M. Chervin, 1992: Ocean general circulation from a global eddy-resolving model. J. Geophys. Res., 97, 5493-5550.
54. Stammer, D., R. Tokmakian, A. Semtner, and C. Wunsch, 1996: How well does a 1/4° global circulation model simulate large-scale oceanic observations? J. Geophys. Res., 101, 25 779-25 811.
55. Stevens, D. P., 1991: The open boundary conditions in the United Kingdom Fine-Resolution Antarctic Model. J. Phys. Oceanogr., 21, 1494-1499.
56. Stramma, L., and J. R. E. Lutjeharms, 1997: The flow field of the subtropical gyre of the South Indian Ocean. J. Geophys. Res., 102, 5513-5530.
57. van Leeuwen, P. J., W. P. M. de Ruijter, and J. R. E. Lutjeharms, 2000: Natal pulses and the formation of Agulhas rings. J. Geophys. Res., 105, 6425-6436.
58. Walker, N. D., and R. D. Mey, 1988: Ocean/atmosphere heat fluxes within the Agulhas Retroflection region. J. Geophys. Res., 93, 15 473-15 483.