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Climate Dynamics

, Volume 33, Issue 7–8, pp 985–998 | Cite as

Interannual variability of the Guinea Dome and its possible link with the Atlantic Meridional Mode

  • Takeshi Doi
  • Tomoki Tozuka
  • Toshio Yamagata
Article

Abstract

Using a high-resolution ocean general circulation model forced by NCEP/NCAR reanalysis data, the interannual variability of the Guinea Dome is studied from a new viewpoint of its possible link with the Atlantic Meridional Mode (AMM), which is related to the meridional migration of the Intertropical Convergence Zone (ITCZ). The dome develops off Dakar seasonally from late spring to late fall owing to the wind-induced Ekman upwelling; its seasonal evolution is associated with the northward migration of the ITCZ. When the ITCZ is located anomalously northward (southward) from late spring to early summer, as a result of the wind-evaporation-sea surface temperature (SST) positive feedback with positive (negative) SST anomaly over the Northern Hemisphere, the dome becomes unusually strong (weak) in fall as a result of stronger (weaker) Ekman upwelling. This may contribute to the decay of the AMM. Thus, the coupled nature between the AMM and the Guinea Dome could be important in understanding, modeling, and predicting the tropical Atlantic variability.

Keywords

Atlantic Meridional Mode Guinea Dome Intertropical Convergence Zone Interannual variability 

Notes

Acknowledgments

We thank H. Sasaki and Y. Masumoto for the OFES data, which was run on the Earth Simulator Center of Japan Agency for Marine-Earth Science and Technology. The present research is supported by the Japan Society for Promotion of Science (JSPS) through Grant-in-Aid for Scientific Research B (20340125). Also, the first author is supported by the Research Fellowship of the JSPS for Young Scientists (208479). Wavelet software was provided by C. Torrence and G. Compo, and is available at http://atoc.colorado.edu/research/wavelets/.

References

  1. Barreiro M, Giannini A, Chang P, Saravanan R (2004) On the role of the South Atlantic atmospheric circulation in tropical Atlantic variability. In Earth’s climate: the ocean-atmosphere interaction. Geophys Monogr Ser 147:143–156Google Scholar
  2. Barreiro M, Chang P, Ji L, Saravanan R, Giannini A (2005) Dynamic elements of predicting boreal spring tropical Atlantic sea-surface temperatures. Dyn Atmos Oceans 39:61–85. doi: 10.1016/j.dynatmoce.2004.10.013 CrossRefGoogle Scholar
  3. Breugem WP, Hazeleger W, Haarsma RJ (2006) Multi-model study of tropical Atlantic variability and change. Geophys Res Lett. doi: 10.1029/2006GL027831
  4. Breugem WP, Hazeleger W, Haarsma RJ (2007) Mechanisms of northern tropical Atlantic variability and response to CO2 doubling. J Clim 20:2691–2705. doi: 10.1175/JCLI4137.1 CrossRefGoogle Scholar
  5. Busalacchi AJ, Picaut J (1983) Seasonal variability from a model of the tropical Atlantic ocean. J Phys Oceanogr 13:1564–1588. doi: 10.1175/1520-0485(1983)013<1564:SVFAMO>2.0.CO;2 CrossRefGoogle Scholar
  6. Chang P, Ji L, Li H (1997) A decadal climate variation in the tropical Atlantic ocean from thermodynamic air-sea interactions. Nature 385:516–518. doi: 10.1038/385516a0 CrossRefGoogle Scholar
  7. Chiang JCH, Vimont DJ (2004) Analogous Pacific and Atlantic meridional modes of tropical atmosphere-ocean variability. J Clim 17:4143–4158. doi: 10.1175/JCLI4953.1 CrossRefGoogle Scholar
  8. Conkright ME et al (1998) World ocean database 1998 documentation and quality control. Available via DIALOG. http://www.nodc.noaa.gov/OC5/WOA98F/woaf_cd/doc/readme.html of subordinate document. Accessed 23 May 2008
  9. Dewitte DG, Schneider EK (2006) Diagnosing the annual cycle modes in the tropical Atlantic ocean using a directly coupled atmosphere-ocean GCM. J Clim 19:5319–5342. doi: 10.1175/JCLI3888.1 CrossRefGoogle Scholar
  10. Doi T, Tozuka T, Sasaki H, Masumoto Y, Yamagata T (2007) Seasonal and interannual variations of oceanic conditions in the Angola Dome. J Phys Oceanogr 37:2698–2713. doi: 10.1175/2007JPO3552.1 CrossRefGoogle Scholar
  11. Dommenget D, Latif M (2000) Interannual to decadal variability in the tropical Atlantic. J Clim 13:777–792. doi: 10.1175/1520-0442(2000)013<0777:ITDVIT>2.0.CO;2 CrossRefGoogle Scholar
  12. Enfield DB, Mestas-Nunez DA, Mayer MA, Serrano CL (1999) How ubiquitous is the dipole relationship in tropical Atlantic sea surface temperatures. J Geophys Res 104:7841–7848. doi: 10.1029/1998JC900109 CrossRefGoogle Scholar
  13. Huang B, Shukla J (2005) Ocean-atmosphere interactions in the tropical and subtropical Atlantic ocean. J Clim 18:1652–1672. doi: 10.1175/JCLI3368.1 CrossRefGoogle Scholar
  14. Kalnay E et al (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteorol Soc 77:437–471. doi: 10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2 CrossRefGoogle Scholar
  15. Kushnir Y, Robinson WA, Chang P, Robertson AW (2006) The physical basis for predicting Atlantic sector seasonal to interannual climate variability. J Clim 19:5949–5970. doi: 10.1175/JCLI3943.1 CrossRefGoogle Scholar
  16. Large WG, McWilliams JC, Doney SC (1994) Oceanic vertical mixing: a review and a model with a nonlocal boundary layer parameterization. Rev Geophys 32:363–403. doi: 10.1029/94RG01872 CrossRefGoogle Scholar
  17. Lazaro C, Fernandes MJ, Santos AMP, Oliverira P (2005) Seasonal and interannual variability of surface circulation in the Cape Verde region from 8 years of merged T/P and ERS-2 altimeter data. Remote Sens Environ 98:45–62. doi: 10.1016/j.rse.2005.06.005 CrossRefGoogle Scholar
  18. Masina S, Pietro PD, Navarra A (2004) Interannual-to-decadal variability of the North Atlantic from an ocean data assimilation system. Clim Dyn 23:531–546. doi: 10.1007/s00382-004-0453-6 CrossRefGoogle Scholar
  19. Masumoto Y, Sasaki H, Kagimoto T, Komori N, Ishida A, Sasai Y, Miyama T, Motoi T, Mitsudera H, Takahashi K, Sakuma H, Yamagata T (2004) A fifty-year eddy-resolving simulation of the world ocean–preliminary outcomes of OFES (OGCM for the earth simulator). J Earth Simul 1:35–56Google Scholar
  20. Mazeika PA (1967) Thermal domes in the eastern tropical Atlantic Ocean. Limnol Oceanogr 12:537–539CrossRefGoogle Scholar
  21. Moron V, Robertson AW, Ward MN (2006) Seasonal predictability and spatial coherence of rainfall characteristics in the tropical setting of Senegal. Mon Weather Rev 134:3248–3262. doi: 10.1175/MWR3252.1 CrossRefGoogle Scholar
  22. Okumura Y, Xie SP (2006) Some overlooked features of tropical Atlantic climate leading to a new Niño-like phenomenon. J Clim 19:5859–5874. doi: 10.1175/JCLI3928.1 CrossRefGoogle Scholar
  23. Pacanowski RC, Griffies SM (2000) MOM 3.0 manual. Available via DIALOG. http://www.gfdl.gov/~smg/MOM/web/guide_parent/guide_parent.html of subordinate document. Accessed 23 May 2008
  24. Pelegri JL, Marrero-Diaz A, Ratsimandresy AW (2006) Nutrient irrigation of the North Atlantic. Prog Oceanogr 70:366–406. doi: 10.1016/j.pocean.2006.03.018 CrossRefGoogle Scholar
  25. Pradhan Y, Lavender SJ, Hardman-Mountford NJ, Aiken J (2006) Seasonal and inter-annual variability of chlorophyll-a concentration in the Mauritanian upwelling: observation of an anomalous event during 1998–1999. Deep Sea Res Part II Top Stud Oceanogr 53:1548–1559. doi: 10.1016/j.dsr2.2006.05.016 CrossRefGoogle Scholar
  26. Rosati A, Miyakoda K (1988) A general circulation model for upper ocean circulation. J Phys Oceanogr 18:1601–1626. doi: 10.1175/1520-0485(1988)018<1601:AGCMFU>2.0.CO;2 CrossRefGoogle Scholar
  27. Rossignol M, Meyrueis AM (1964) Campagnes oceanographiques du Gerad-Treca, Cent. Oceanogr. Dakar-Thiaroye, ORSTOM, Dakar, Senegal, p 53Google Scholar
  28. Ruiz-Barradas A, Carton JA, Nigam S (2000) Structure of interannual-to-decadal climate variability in the tropical Atlantic sector. J Clim 13:3285–3297. doi: 10.1175/1520-0442(2000)013<3285:SOITDC>2.0.CO;2 CrossRefGoogle Scholar
  29. Schouten MW, Matano RP, Strub TP (2005) A description of the seasonal cycle of the equatorial Atlantic from altimeter data. Deep Sea Res Part I Oceanogr Res Pap 52:477–493. doi: 10.1016/j.dsr.2004.10.007 CrossRefGoogle Scholar
  30. Servain J (1991) Simple climatic indices for the tropical Atlantic-ocean and some applications. J Geophys Res 96:15137–15146. doi: 10.1029/91JC01046 CrossRefGoogle Scholar
  31. Servain J, Wainer I, McCreary JP, Dessier A (1999) Relationship between the equatorial and meridional modes of climate variability in the tropical Atlantic. Geophys Res Lett 26:485–488. doi: 10.1029/1999GL900014 CrossRefGoogle Scholar
  32. Siedler G, Zangenberg N, Onken R (1992) Seasonal changes in the tropical Atlantic circulation: observation and simulation of the Guinea Dome. J Geophys Res 97:703–715. doi: 10.1029/91JC02501 CrossRefGoogle Scholar
  33. Signorini SR, Murtugudde RG, McClain CR, Christian JR, Picaut J, Busalacchi AJ (1999) Biological and physical signatures in the tropical and subtropical Atlantic. J Geophys Res 104:18367–18382. doi: 10.1029/1999JC900134 CrossRefGoogle Scholar
  34. Smith TM, Reynolds RW (2004) Improved extended reconstruction of SST (1854–1997). J Clim 17:2466–2477. doi: 10.1175/1520-0442(2004)017<2466:IEROS>2.0.CO;2 CrossRefGoogle Scholar
  35. Smith RD, Maltrud ME, Bryan FO, Hecht MW (2000) Numerical simulation of the North Atlantic Ocean at 1/10. J Phys Oceanogr 30:1532–1561. doi: 10.1175/1520-0485(2000)030<1532:NSOTNA>2.0.CO;2 CrossRefGoogle Scholar
  36. Stramma L, Huttl S, Schafstall J (2005) Water masses and currents in the upper tropical northeast Atlantic off northwest Africa. J Geophys Res. doi: 10.1029/2005JC002939
  37. Torrence C, Compo GP (1998) A practical guide to wavelet analysis. Bull Am Meteorol Soc 79:61–78. doi: 10.1175/1520-0477(1998)079<0061:APGTWA>2.0.CO;2 CrossRefGoogle Scholar
  38. Xie SP (1999) A dynamic ocean-atmosphere model of the tropical Atlantic decadal variability. J Clim 12:64–70Google Scholar
  39. Xie SP, Carton JA (2004) Tropical Atlantic variability: patterns, mechanisms, and impacts. In Earth’s climate: the ocean-atmosphere interaction. Geophys Monogr Ser 147:121–142Google Scholar
  40. Yamagata T, Iizuka S (1995) Simulation of the tropical thermal domes in the Atlantic: a seasonal cycle. J Phys Oceanogr 25:2129–2140. doi: 10.1175/1520-0485(1995)025<2129:SOTTTD>2.0.CO;2 CrossRefGoogle Scholar
  41. Yu L, Jin X, Weller RA (2006) Role of net surface heat flux in seasonal variations of sea surface temperature in the tropical Atlantic Ocean. J Clim 19:6153–6169. doi: 10.1175/JCLI3970.1 CrossRefGoogle Scholar
  42. Zebiak SE (1993) Air-sea interaction in the equatorial Atlantic region. J Clim 6:1567–1586. doi: 10.1175/1520-0442(1993)006<1567:AIITEA>2.0.CO;2 CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Department of Earth and Planetary Science, Graduate School of ScienceThe University of TokyoTokyoJapan

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