Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil

Araujo, M.; Limongi, C.; Servain, J.; Silva, M.; Leite, F. S.; Veleda, D.; Lentini, C. A. D.

doi:https://doi.org/10.5194/os-7-63-2011

Articles | Volume 7, issue 1

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Articles | Volume 7, issue 1

https://doi.org/10.5194/os-7-63-2011

Articles | Volume 7, issue 1

Article
Peer review
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Related articles

20 Jan 2011

| 20 Jan 2011

Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil

M. Araujo, C. Limongi, J. Servain, M. Silva, F. S. Leite, D. Veleda, and C. A. D. Lentini

M. Araujo

GOAT – Grupo de Oceanografia Tropical – http://www.goat.fis.ufba.br

Departamento de Oceanografia, Universidade Federal de Pernambuco, Recife-PE, Brazil

C. Limongi

GOAT – Grupo de Oceanografia Tropical – http://www.goat.fis.ufba.br

Departamento de Oceanografia, Universidade Federal de Pernambuco, Recife-PE, Brazil

J. Servain

Institut de Recherche pour le Développement (IRD), UMR-182, Paris, France

Visiting Scientist at Fundação Cearense de Meteorologia e Recursos Hídricos (FUNCEME), Fortaleza, CE, Brazil

GOAT – Grupo de Oceanografia Tropical – http://www.goat.fis.ufba.br

M. Silva

GOAT – Grupo de Oceanografia Tropical – http://www.goat.fis.ufba.br

Departamento de Oceanografia, Universidade Federal de Pernambuco, Recife-PE, Brazil

F. S. Leite

Departamento de Oceanografia, Universidade Federal de Pernambuco, Recife-PE, Brazil

D. Veleda

Departamento de Oceanografia, Universidade Federal de Pernambuco, Recife-PE, Brazil

C. A. D. Lentini

Departamento de Física da Terra e do Meio Ambiente, Universidade Federal da Bahia, Salvador-BA, Brazil

GOAT – Grupo de Oceanografia Tropical – http://www.goat.fis.ufba.br

Related subject area

Approach: In situ Observations | Depth range: Thermocline | Geographical range: Deep Seas: South Atlantic | Phenomena: Temperature, Salinity and Density Fields

Freshening of Antarctic Intermediate Water in the South Atlantic Ocean in 2005–2014

Wenjun Yao, Jiuxin Shi, and Xiaolong Zhao

Ocean Sci., 13, 521–530, https://doi.org/10.5194/os-13-521-2017,https://doi.org/10.5194/os-13-521-2017, 2017

Short summary

Antarctic Intermediate Water (AAIW) in the South Atlantic Ocean has experienced basin-scaled freshening from 2005 to 2014, reflected by the Argo gridded products. Two zonal sections of WOCE observation also revealed a similar quasi-decadal signal. Our analysis revealed that such freshening was induced by the increase of freshwater input in the AAIW ventilation region and the decrease of Agulhas Leakage transport.

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Cited articles

Ando, K. and McPhaden, M. J.: Variability of surface layer hydrography in the tropical Pacific Ocean, J. Geophys. Res., 102, 23063–23078, 1997.

Blanck, H. F.: Using TOPEX Satellite El-Niño altimetry data to introduce thermal expansion and heat capacity concepts in chemistry courses, J. Chem. Educ., 76, 1635–1646, 1999.

Bourlès, B., Gouriou, Y., and Chuchla, R.: On the circulation in the upper layer of the western equatorial Atlantic, J. Geophys. Res., 104, 21151–21170, 1999.

Brainerd, K. E. and Gregg, M. C.: Surface mixed and mixing layer depths, Deep-Sea Res. Pt. I, 42, 1521–1543, 1995.

Cronin, M. F. and McPhaden, M. J.: Barrier layer formation during westerly wind bursts, J. Geophys. Res., 107(C12), 2101–2112, 2002.

De Boyer Montégut, C., Madec, G., Fischer, A. S., Lazar, A., and Iudicone, D.: Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology, J. Geophys. Res., 109, C12003, https://doi.org/10.1029/2004JC002378, 2004.

De Boyer Montégut, C. B., Mignot, J., Lazar, A., and Cravatte, S.: Control of salinity on the mixed layer depth in the world ocean: 1. General description, J. Geophys. Res., 112, C06011, https://doi.org/10.1029/2006JC003953, 2007.

Defant, A.: Schichtung und Zirkulation des Atlantischen Ozeans, Die Troposphäre, Wiss. Ergebn. Dt. Atlant. Exped. "Meteor" 1925–1927, 6, 289–411, 1936.

Defant, A.: Physical oceanography, vol. I, Pergamon Press, New York, 729 pp., 1961.

Delcroix, T. and McPhaden, M.: Interannual sea surface salinity and temperature changes in the western Pacific warm pool during 1992–2000, J. Geophys. Res., 107(C12), 8002, https://doi.org/10.1029/2001JC000862, 2002.

Dengler, M., Schott, F. A., Eden, C., Brandt, P., Fischer, J., and Zantopp, R. J.: Break-up of the Atlantic deep western boundary current into eddies at 8° S, Nature, 432, 1018–1020, 2004.

Foltz, G. R. and McPhaden, M. J.: Impact of barrier layer thickness on SST in the central tropical North Atlantic, J. Climate, 22, 285–299, 2009.

Goes, M., Molinari, R., da Silveira, I., and Wainer, I.: Retroflection of the North Brazil Current during February 2002, Deep-Sea Res., 52, 647–667, 2005.

Kara, A. B., Rochford, P. A., and Hurlburt, H. E.: Mixed layer depth variability and barrier layer formation over the north Pacific ocean, J. Geophys. Res., 105, 16783–16801, 2000.

Lambert, R. B. and Sturges, W.: A thermohaline staircase and vertical mixing in the thermocline, Deep-Sea Res., 24, 211–222, 1977.

Levitus, S.: Climatological atlas of the World Ocean, NOAA Prof. Paper 13, U.S. Govt. Printing Office, 173 pp., 1982.

Lukas, R. and Lindström, E.: The mixed layer of the western equatorial Pacific ocean, J. Geophys. Res., 96, 3343–3357 (Suppl.), 1991.

Lumpkin, R. and Garzoli, S. L.: Near-surface circulation in the tropical Atlantic ocean, Deep-Sea Res., 52, 495–518, 2005.

Medeiros, C., Araujo, M., Freitas, I., and Rollnic, M.: Massa d'água da região oeste do Atlântico tropical, in: Programa REVIZEE – SCORE NE, vol. 1, edited by: Hazin, F., 56–69, 2009a.

Medeiros, C., Araujo, M., Rollnic, M., and Freitas, I.: Estrutura termohalina da região oeste do Atlântico tropical, in: Programa REVIZEE – SCORE NE, vol. 1, edited by: Hazin, F., 40–55, 2009b.

Mignot, J., de Boyer Montégut, C. B., Lazar, A., and Cravatte, S.: Control of salinity on the mixed layer depth in the world ocean: 2. Tropical areas, J. Geophys. Res., 112, C06011, https://doi.org/10.1029/2006JC003954, 2007.

Monterrey, G. and Levitus, S.: Seasonal variability of mixed layer depth for the world ocean, NOAA Atlas NESDIS 14, U.S. Department of Commerce, Washington, D.C., 96 pp., 1997.

Ohlmann, J. C., Siegel, D. A., and Gautier, C.: Ocean mixed layer depth heating and solar penetration: A global analysis, J. Climate, 9, 2265–2280, 1996.

Pailler, K., Bourlès, B., and Gouriou, Y.: The barrier layer in the western Atlantic ocean, Geophys. Res. Lett., 26, 2069–2072, 1999.

Rodrigues, R. R., Rothstein, L. M., and Wimbush, M.: Seasonal variability of the South Equatorial Current bifurcation in the Atlantic ocean: A numerical study, J. Phys. Oceanogr., 37, 16–30, 2007.

Sato, K., Suga, T., and Hanawa, K.: Barrier layers in the subtropical gyres of the world's oceans, Geophys. Res. Lett., 33, L08603, https://doi.org/10.1029/2005GL025631, 2006.

Schott, F. A., Dengler, M., Zantropp, R., Stramma, L., Fischer, J., and Brandt, P.: The shallow and deep western boundary circulation of the South Atlantic at 5°–11° S, J. Phys. Oceanogr., 35, 2031–2053, 2005.

Silva, A. C., Araujo, M., Medeiros, C., Silva, M., and Bourlès, B.: Seasonal changes in the mixed and barrier layers in the western equatorial Atlantic, Braz. J. Oceanogr., 53(3/4), 83–98, 2005.

Silva, M. A., Araujo, M., Servain, J., Peven, P., and Lentini, C. A. D.: High-Resolution Regional Ocean Dynamics Simulation in the Southwestern Tropical Atlantic, Ocean Model., 30, 256–269, 2009.

Spall, M. A.: A diagnostic study of wind- and buoyancy-driven north Atlantic circulation, J. Geophys. Res., 96, 18509–18518, 1991.

Sprintall, J. and Tomczak, M.: Evidences of the barrier layer in the surface layer of the tropics, J. Geophys. Res., 97, 7305–7316, 1992.

Stramma, L. and Schott, F.: The mean flow field of the tropical Atlantic ocean, Deep-Sea Res., 46B, 279–303, 1999.

Stramma, L., Fischer, J., and Reppin, J.: The North Brazil Undercurrent, Deep-Sea Res. Pt. I, 42, 773–795, 1995.

Stramma, L., Rhein, M., Brandt, P., Dengler, M., Boning, C., and Walter, M.: Upper ocean circulation in the western tropical Atlantic in boreal fall 2000, Deep-Sea Res. Pt. I, 52, 221–240, 2005.

Swenson, M. S. and Hansen, D. V.: Tropical Pacific Ocean mixed layer heat budget: The Pacific cold tongue, J. Phys. Oceanogr., 29, 69–81, 1999.

Tanguy, Y., Arnault, S., and Lattes, P.: Isothemal, mixed, and barrier layers in the subtropical and tropical Atlantic Ocean during the ARAMIS experiment, Deep-Sea Res. Pt. I, 57, 501–517, 2010.

Vialard, J. and Delecluse, P.: An OGCM study for TOGA decade. Part II: Barrier layer formation and variability, J. Phys. Oceanogr., 28, 1089–1106, 1998.

Wilson, W. D., Johns, E., and Molinari, R. L.: Upper layer circulation in the western tropical North Atlantic Ocean during August 1989, J. Geophys. Res., 99, 22513–22523, 1994.

Zeng, L., Du, Y., Xie, S.-P., and Wang, D.: Barrier Layer in the South China Sea during summer 2000, Dynam. Atmos. Oceans, 47, 38–54, 2009.