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Ocean Dynamics

, Volume 64, Issue 10, pp 1431–1446 | Cite as

Methods for estimating the velocities of the Brazil Current in the pre-salt reservoir area off southeast Brazil (23 S–26 S)

  • Tiago Carrilho Biló
  • Ilson Carlos Almeida da Silveira
  • Wellington Ceccopieri Belo
  • Belmiro Mendes de Castro
  • Alberto Ricardo Piola
Article

Abstract

The Brazil Current (BC) is likely the least observed and investigated subtropical western boundary current in the world. This study proposes a simple and systematic methodology to estimate quasi-synoptic cross-sectional speeds of the BC within the Santos Basin (23 S–26 S) based on the dynamic method using several combinations of data: Conductivity, temperature, and depth (CTD), temperature profiles, CTD and vessel-mounted Acoustic Doppler Current Profiler (VMADCP), and temperature profiles and VMADCP. All of the geostrophic estimates agree well with lowered Acoustic Doppler Current Profiler (LADCP) velocity observations and yield volume transports of -5.56 ±1.31 and 2.50 ±1.01 Sv for the BC and the Intermediate Western Boundary Current (IWBC), respectively. The LADCP data revealed that the BC flows southwestward and is ∼100 km wide, 500 m deep, and has a volume transport of approximately -5.75 ±1.53 Sv and a maximum speed of 0.59 m s−1. Underneath the BC, the IWBC flows northeastward and has a vertical extent of approximately 1,300 m, a width of ∼60 km, a maximum velocity of ∼0.22 m s−1, and a volume transport of 4.11 ± 2.01 Sv. Our analysis indicates that in the absence of the observed velocities, the isopycnal (σ 0) of 26.82 kg m−3 (∼500 dbar) is an adequate level of no motion for use in geostrophic calculations. Additionally, a simple linear relationship between the temperature and the specific volume anomaly can be used for a reliable first estimate of the BC-IWBC system in temperature-only transects.

Keywords

Brazil Current Intermediate Western Boundary Current Santos Basin circulation Geostrophic estimates 

Notes

Acknowledgements

We acknowledge the Brazilian National oil company PETROBRAS for the CERES experiment data set and their partnership. We also acknowledge the two anonymous reviewers and MSc. César Barbedo Rocha for thoughtful insights and important suggestions. This research was funded by Séo Paulo Research Foundation (FAPESP, 2012/05221-2 and 2013/10475-6). Ilson Carlos Almeida da Silveira and Belmiro Mendes de Castro acknowledge support from CNPq (307122/2010-7).

References

  1. Boebel O, Davis R E, Ollitrault M, Peterson R G, Richardson P L, Schmid C, Zenk W (1999) The intermediate depth circulation of the western south atlantic. Geophys Res Lett 26 (21):3329–3332CrossRefGoogle Scholar
  2. Campos E J D, Gonçalves J E, Ikeda Y (1995) Water mass characteristics and geostrophic circulation in the South Brazil Bight: Summer of 1991. J Geophys Res 1lo (C9):18, 537–18,550CrossRefGoogle Scholar
  3. Campos E J D, Ikeda Y, Castro B M, Gaeta S A, Lorenzzetti J A, Stevenson M R (1996) Experiment studies circulation in the western south atlantic. EOS, Trans Am Geophys Union 77 (27):253–264CrossRefGoogle Scholar
  4. Carminatti M, Wolff B, Gamboa L A P (2008) New exploratory frontiers in Brazil, In: 19th World Petroleum Congress. Madrid, SpainGoogle Scholar
  5. Cokelet E D, Shcall M L, Dougherty D M (1996) ADCP-Referenced geostrophic circulation in the bering sea basin. J Phys Oceanogr 26 (7):1113–1128CrossRefGoogle Scholar
  6. Cushman-Roisin B, Beckers JM (1994). In: 2nd (ed) Introduction to geophysical fluid dynamics: Physical and numerical aspects, international geophysics series, Vol 101. ElsevierGoogle Scholar
  7. Duarte C S L, Viana A R (2007) Santos drift system: Stratigraphic organization and implications for late Cenozoic paleocirculation in the Santos Basin, SW Atlantic Ocean. Geological Society, London. Special Publications 276:171–198CrossRefGoogle Scholar
  8. Emery W J, Thomson R E (2001) Data analysis methods in physical oceanography. Elsevier, Amsterdam, The NetherlandsGoogle Scholar
  9. Evans D L, Signorini S R (1985) Vertical structure of the Brazill Current. Nature 315:48–50CrossRefGoogle Scholar
  10. Evans D L, Signorini S R, Miranda L B (1983) A note on the transport of the Brazil Current. J Phys Oceanogr 13 (9):1732–1738CrossRefGoogle Scholar
  11. Fischer J, Visbeck M (1993) Deep velocity profiling with self-contained ADCPs. J Atmos Oc Tech 10:764–773CrossRefGoogle Scholar
  12. Garfield N (1990) The Brazil Current at subtropical latitudes, PhD thesis. University of Rhode Island, Rhode IslandGoogle Scholar
  13. Johns E, Watts R D, Rossby T H (1989) A Test of geostrophy in the gulf stream. J Phys Oceanogr 94 (C3):3211–3222Google Scholar
  14. Legeais J F, Ollitrault M, Arhan M (2013) Lagrangian observations in the Intermediate Western Boundary Current of the South Atlantic. Deep-Sea Res II (85):109–126CrossRefGoogle Scholar
  15. Lima J A M (1997) Oceanic circulation on the Brazil Current shelf break and slope at 22S, PhD thesis, publisher=University of New South Wales, address=New South WalesGoogle Scholar
  16. Locarnini RA, Mishonov AV, Antonov JI, Boyer TP, Garcia HE, Baranova OK, Zweng MM, Paver CR, Reagan JR, Johnson DR, Hamilton M, Seidov D (2013) World Ocean Atlas 2013, Volume 1: Temperature. Tech. rep., NOAA Atlas NESDIS 73Google Scholar
  17. Meinen C S, Watts R D, Clarke A R (2000) Absolutely referenced geostrophic velocity and transport on a section across the North Atlantic Current. Deep-Sea Res I: Oceanogr Res Pap 47:309–322CrossRefGoogle Scholar
  18. Meinen C S, Piola A R, Perez R C, Garzoli S L (2012) Deep Western Boundary Current transport variability in the South Antlantic: Preliminary results from a pilot array at 34.5S. Ocean Sci 8:1041–1054CrossRefGoogle Scholar
  19. Meisling K E, Cobbold P R, Mount V S (2001) Segmentation of an obliquely-rifted margin. AAPG Bulletin 85 (11):1903–1924Google Scholar
  20. Mémery L, Arhan M, Alvarez-Salgado X A, Messias M J, Mercier H, Castro C G, Rios A F (2000) The water masses along the western boundary of the south and equatorial Atlantic. Prog Oceanog 47 (1):69–98CrossRefGoogle Scholar
  21. Miranda L B, Filho B M C (1979) Condições do movimento geostrófico das águas adjacentes a Cabo Frio (RJ). BOL DO INST OCEANOGR 28 (2):79–93CrossRefGoogle Scholar
  22. Mohriak W U, Nóbrega M, Odegard ME, Gomes BS, Dickson WG (2010). Petr Geosc 16:231–245CrossRefGoogle Scholar
  23. Müller TJ, Ikeda Y, Zangenberg N, Nonato LV (1998) Direct measurements of western boundary currents off brazil between 20S and 28S. J Geophys Res 103 (C3):5429–5437CrossRefGoogle Scholar
  24. Palma E D, Matano R P, Piola A R (2004) A numerical study of the Southwestern Atlantic Shelf circulation: Barotropic response to tidal and wind forcing. J Geophys Res 109 (C08–104)Google Scholar
  25. Pereira A F, Castro B M, Calado L, Silveira I C A (2007) Numerical simulation of M 2 internal tides in South Brazil Bight and their interaction with the Brazil Current. J Geophys Res 112 (C04009)Google Scholar
  26. Pickart R S, Lindstrom S S (1994) A comparison of techniques for referencing geostrophic velocities. J Atmos Oc Tech 11 (3):814–824CrossRefGoogle Scholar
  27. Preu B, Hernódez-Molina FJ, Violante R, Piola AR, Paterlinif CM, Schwenk T, Voigt I, Krastel S, Spiess V (2013) Morphosedimentary and hydrographic features of the northern Argentine margin: the interplay between erosive, depositional and gravitational processes and its conceptual implications. Deep-Sea Res I: Oceanogr Res Pap 75:157–174CrossRefGoogle Scholar
  28. Rocha C B, da Silveira I C A, Castro B M, Lima J A M (2014) Vertical structure, energetics, and dynamics of the Brazil Current System at 22S-28S. J Geophys Res-Oceans 19 (1):52–69CrossRefGoogle Scholar
  29. Schott F A, Dengler M, Zantopp R, Stramma L, Fischer J, Brandt P (2005) The shallow and deep western boundary circulation of the south atlantic at 5-11S. J Phys Oceanogr 35:2031– 2053CrossRefGoogle Scholar
  30. Signorini S R (1978) On the circulation and the volume transport of the Brazil Current between the Cape of São Tomé and Guanabara Bay. Deep-Sea Res 5 (25):481–490CrossRefGoogle Scholar
  31. Silveira IC, Lima JAM, Schimdt ACK, Ceccopieri W, Satori A, Francisco CPF, Fontes RFC (2008) Is the meander growth in the Brazil Current System off Southeast Brazil due to baroclinic instability?. Dynam Atmos Oceans 45:187–207CrossRefGoogle Scholar
  32. Silveira I C A, Schimidt A C K, Campos E J D (2001) A Corrente do Brasil ao largo da costa leste brasileira. R bras Oceanogr 48 (2):171–183CrossRefGoogle Scholar
  33. Silveira I C A, Calado L, De Castro BM, Cirano M, Lima JAM, Mascarenhas AS (2004) On the Baroclinic structure of the Brazil Current-Intermediate Western Boundary Current at 22-23. S. Geophys Res Lett 31:4308Google Scholar
  34. Stramma L (1989) The Brazil Current transport south of 23S. Deep-Sea Res 36 (4A):639–646CrossRefGoogle Scholar
  35. Stramma L, England M (1999) On the wather masses and mean circulation of the South Atlantic Ocean. J Geophys Res 104 (C9):20, 863–20, 883CrossRefGoogle Scholar
  36. Stramma L, Fischer J, Reppin J (1995) The North Brazil undercurrent. Deep-Sea Res I: Oceanogr Res Pap 42 (5):773–795CrossRefGoogle Scholar
  37. Vianna M L, Menezes V V (2011) Double-celled subtropical gyre in the South Atlantic Ocean: Means, trends and interannual changes. J Geophys Res 116 (C03–s024)Google Scholar
  38. Visbeck M (2002) Deep velocity using acoustic doppler current profilers: botton track and inverse solutions. J Atmos Oc Tech 19:794–807CrossRefGoogle Scholar
  39. Zembruscki S (1979) Geomorfologia da Margem Continental Sul Brasileira e das Bacias Ocenicas Adjacentes. In Projeto REMAC. PETROBRAS. CEMPES. DINTEP (Série REMAC n 7), pp 129–177Google Scholar
  40. Zweng M M, Reagan J R, Antonov J I, Locarnini R A, Mishonov A V, Boyer T P, Garcia H E, Baranova O K, Johnson D R, Seidov D, Biddle M M (2013) World ocean atlas 2013, Volume 2: Salinity. Tech. rep., NOAA Atlas NESDIS 73Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Tiago Carrilho Biló
    • 1
  • Ilson Carlos Almeida da Silveira
    • 1
  • Wellington Ceccopieri Belo
    • 2
  • Belmiro Mendes de Castro
    • 1
  • Alberto Ricardo Piola
    • 3
  1. 1.Instituto Oceanográfico da Universidade de São PauloSão PauloBrasil
  2. 2.Centro de Pesquisas e Desenvolvimento Leopoldo A. Miguez de MelloPetróleo BrasileiroBrasil
  3. 3.Sección Dinámica Oceánica, Servicio de Hidrografia Naval (SHN)Universidad de Buenos Aires, and Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos, CONICETBuenos AiresArgentina

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