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Ocean Dynamics

, Volume 68, Issue 8, pp 967–985 | Cite as

Tidal and low-frequency currents off the Jaguaribe River estuary (4° S, 37° 4′ W), northeastern Brazil

  • Francisco Jose da Silva Dias
  • Belmiro Mendes Castro
  • Luiz Drude Lacerda
Article

Abstract

This article characterizes the spatial and temporal current variations, in the subtidal and tidal ranges, during the rainy and dry seasons, at the continental shelf off the Jaguaribe River, through measurements of continuous current field data from an acoustic Doppler current profiler (ADCP) mooring during 124 days, from June 12 to October 14, 2009. To support this dataset, we collected corresponding data from a meteorological station located at the estuary. The spatial variation showed that highest current speeds occur near the coast, with an offset of a NNW coastal jet, decreasing intensity, monotonically, towards offshore up to 0.1 ms−1. In the rainy season, small inversions of the wind field were observed, lasting 2 to 3 days on average and were accompanied by the direction of surface currents only. In the dry season, the period of reversal of wind fields and currents lasted 14 and 35 h, respectively. The analysis of empirical orthogonal functions in rainy and dry seasons showed that the continental shelf is predominantly barotropic, where the second and third modes explained only 7% of the total variance, during the dry season. The tidal currents are more intense in the direction normal to the coast, showing a semidiurnal tidal regime. Energy distribution between tidal currents and currents of longer periods showed that for the component parallel to bathymetry, subtidal frequency currents are dominant, contributing to more than 70% of the variance. For the normal component to the coastline bathymetry, there is a significant increase of power concerning tidal currents, at all depths, so they contribute with about 55% of the total variance.

Keywords

Currents Shallow waters Continental shelf, equatorial Atlantic Ocean 

Notes

Acknowledgements

We extend our deep thanks to the crew of the N.Oc Prof. Martins Filho, who made this work possible and to the Oceanographic Instrumentation Laboratory at the University of São Paulo (LIO/IO/USP), especially to engineers Francisco Vicentini and Luiz V. Nonato and to technician Wilson Natal.

Funding information

This study is part of the INCT-TMCOcean project (http://www.incttmcocean.eco.br): “Continent-Ocean Materials Transfer” supported by CNPq, Brazil, process no. 573.601/2008-9. The authors also thank the Blue Amazon Program from CAPES for providing grants to FJSD.

References

  1. Allen JS, Kundu PK (1978) On the momentum, vorticity, and mass balance on the Oregon shelf. J Phys Oceanogr 8:13–27CrossRefGoogle Scholar
  2. Amorim FN, Cirano M, Soares ID, Campos EJD, Midleton JF (2012) The influence of large-scale circulation, transient and local processes on the seasonal circulation of the Eastern Brazilian Shelf, 13o S. Cont Shelf Res 32:47–61CrossRefGoogle Scholar
  3. Amorim FN, Cirano M, Marta-Almeida M, Middleton JF, Campos EJD (2013) The seasonal circulation of the Eastern Brazilian shelf between 10 S and 16 S: a modelling approach. Cont Shelf Res 65:121–140CrossRefGoogle Scholar
  4. ANA (2006) Vazões históricas para a bacia de drenagem do rio Jaguaribe (CE). In: Relatório interno. Brasília: Agencia Nacional de Aguas. p. 20Google Scholar
  5. Benoit C-R (1994) “The Ekman layer”. Introduction to geophysical fluid dynamics (1st ed.). Prentice Hall. pp. 76–77. ISBN 0-13-353301-8
  6. Bischof B, Mariano AJ, Ryan EH (2003) The North Brazil current. Ocean Surface Currents. http://oceancurrents.rsmas.miami.edu/atlantic/north-brazil.html
  7. Bourles B, Molinari RL, Johns E, Wilson WD (1999) Upper layer currents in the western tropical North Atlantic (1989-1991). J Geophys Res 104(C1):1361–1375CrossRefGoogle Scholar
  8. Brown WS, Irish JD, Winant CD (1987) A description of sub-tidal pressure field observations on the northern California continental shelf during the Coastal Ocean Dynamics Experiment. J Geophys Res 92:1605–1636CrossRefGoogle Scholar
  9. Brown WS, Pettigrew NR, Irish JD (1985) The Nantucket Shoals Flux Experiment (NSFE79). Part II: The structure and variability of across-shelf pressure gradients. J Phys Oceanogr 15:749–771CrossRefGoogle Scholar
  10. Camelo HN, Carvalho PCM, Leal Junior JBV, Accioly Filho JB (2008) Análise estatística da velocidade do vento do Estado do Ceará. Revista Tecnológica 29(2):211–223Google Scholar
  11. Campos AA (2003) A zona costeira do Ceara: Diagnóstico para a gestão integrada, 1ª. edn. Fortaleza, Aquasis 248 pGoogle Scholar
  12. Castro BM (1996. 200 p) Correntes e massas de água da plataforma continental norte de São Paulo. Tese de Livre Docência, São PauloGoogle Scholar
  13. Chepurin G, Carton JA (1997) The hydrography and circulation of the upper 1200 meters in the tropical North Atlantic during 1982–1991. J Mar Res 55(4):633–670CrossRefGoogle Scholar
  14. Cochrane JD (1963) Equatorial undercurrent and related currents off Brazil in March and April 1963. Science 142:669–671CrossRefGoogle Scholar
  15. Csanady GT (1978) The arrested topographic wave. J Phys Oceanogr 8(1):47–62CrossRefGoogle Scholar
  16. Da Silveira ICA, Miranda LB, Brown WS (1994) On the origins of the North Brazil current. J Geophys Res 99(C11):22,501–22,512CrossRefGoogle Scholar
  17. Defant A (1961) Physical oceanography, vol 2. Pergamon Press, New York 598 pGoogle Scholar
  18. Dias FJS, Castro BM, Lacerda LD (2013) Continental shelf water masses off the Jaguaribe River (4 S), Northastern Brazil. Cont Shelf Res 66:123–135CrossRefGoogle Scholar
  19. Dias FJS, Lacerda LD, Marins RV, Paula FCF (2011) Comparative analysis of rating curve and adp estimates of instantaneous water discharge through estuaries in two contrasting Brazilian rivers. Hydrol Process 25(2):2188–2201.  https://doi.org/10.1002/hyp.7972 CrossRefGoogle Scholar
  20. Dias FJS, Marins RV, Maia LP (2009) Hydrology of a well-mixed estuary at the semi-arid northeastern Brazilian coast. Acta Liminologica Brasiliensia 21(4):377–385Google Scholar
  21. Dias FJS, Castro BM, Lacerda LD, Miranda LB, Marins RV (2016) Physical characteristics and discharges of suspended particulate matter at the continent-ocean interface in an estuary located in a semiarid region in northeastern Brazil. Estuar Coast Shelf Sci (180):258–274 ISSN: 02727714Google Scholar
  22. Dottori M, Castro BM (2009) The response of the Sao Paulo continental shelf, Brazil, o synoptic winds. Ocean Dyn 59(4):603–614CrossRefGoogle Scholar
  23. Ekman VW (1905) On the influence of the Earth’s rotation on ocean-currents. Arkiv Matematik, Astron Fysik 2:1–53Google Scholar
  24. Emery WJ, Thomson RE (2001) Data analysis methods in physical oceanography. Elsevier Science, Amsterdam, pp xi–xii, ISBN 9780444507563.  https://doi.org/10.1016/B978-04445056-3/50000-9 CrossRefGoogle Scholar
  25. Fong DA, Geyer WR (2002) The alongshore transport of freshwater in a surfacetrapped river plume. J Phys Oceanogr 32:957–972CrossRefGoogle Scholar
  26. Fong DA, Geyer WR, Signell RP (1997) The wind-forced response on a buoyant coastal current: observations of the western Gulf of Maine plume. J Mar Syst 12:69–81CrossRefGoogle Scholar
  27. FUNCEME (2010) Precipitacões históricas para o baixo jaguaribe. Eletronic Jounal - (www.funceme.br/monitoramento/graficosdechuvas)
  28. García Berdeal I, Hickey BM, Kawase M (2001) Influence of wind stress and ambient flow on high discharge river plume. J Geophys Res 107(C9):3130CrossRefGoogle Scholar
  29. Garvine RW (1995) A dynamical system for classifying buoyant coastal discharges. Cont Shelf Res 15(13):1585–1596CrossRefGoogle Scholar
  30. Garvine RW (1999) Penetration of buoyant coastal discharge onto the continental shelf: a numerical model experiment. J Phys Oceanogr 29:1892–1909CrossRefGoogle Scholar
  31. Gill AE, Schumann EH (1974) The generation of long shelf waves by the wind. J Phys Oceanogr 4(1):83–90CrossRefGoogle Scholar
  32. Hallock ZR, Marmorino GO (2002) Observations of the response of a buoyant estuarine plume to upwelling favorable winds. J Geophys Res 107(C7):3066CrossRefGoogle Scholar
  33. Henrichs S, Bond N, Garvine R, Kineke G, Lohrenz S (2000) Coastal ocean processes (CoOP): transport and transformation processes over continental shelves with substantial freshwater inflows. Technical Report TS-237-00. University of Maryland Center for Environment Science, October 6–8, 1998, Salt Lake City, UtahGoogle Scholar
  34. Hill AE (1998) Buoyancy effects in coastal and shelf seas. In: Robinson AR, Brink KH (eds) The sea, vol 10. The coastal ocean - Process and Methods. John Wiley and Sons, New York, pp 21–62Google Scholar
  35. Jenkins GM, Watts DG (1968) Spectral analysis and its application. Holden-Day 525:525Google Scholar
  36. Johns WE, Lee TN, Beardsley RC, Candela J, Limeburner R, Castro BM (1998) Annual cycle and variability of the North Brazil current. J Phys Oceanogr 28(1):103–128CrossRefGoogle Scholar
  37. Large WG, Pond S (1981) Open ocean momentum flux measurements in moderate to strong winds. J Phys Oceanogr 11:324–336.  https://doi.org/10.1175/1520-0485(1981)0112.0.CO;2 CrossRefGoogle Scholar
  38. Lee TN, Ho WJ, Kourafalou V, Wang JD (1984) Circulation on the continental shelf of the southeastern United States. Part I: subtidal response to wind and gulf stream forcing during winter. J Phys Oceanogr 14:1001–1012CrossRefGoogle Scholar
  39. Lentz SJ, Raubenheimer B (1999) Field observations of wave setup. J Geophys Res 104:25867–25875CrossRefGoogle Scholar
  40. Lentz SJ, Largier J (2006) The influence of wind forcing on the Chesapeake Bay buoyant coastal current. J Phys Oceanogr 36:1305–1316CrossRefGoogle Scholar
  41. Liu Y, Weisberg RH (2005) Momentum balance diagnoses for the West Florida shelf. Cont Shelf Res 25:2054–2074CrossRefGoogle Scholar
  42. Luedemann EF (1967) Preliminary results of the drift-bottle releases in Western Tropical Atlantic. Boletim do Instituto Oceanográfico, Universidade de São Paulo 16:13–22Google Scholar
  43. Luedemann EF, Pereira SG (1976) Some results of drift bottle releasses in western equatorial waters during GATE, 1974. Boletim do Instituto Oceanográfico, Universidade de São Paulo. 4:22Google Scholar
  44. Vianna ML, Menezes VV (2006) Singular spectrum analysis of nonstationary tidal currents applied to ADCP data from the northeast Brazilian shelf. J Atmos Ocean Technol 23:138–151CrossRefGoogle Scholar
  45. Marin FO (2009) A Subcorrente Norte do Brasil ao Largo da Costa do Nordeste. 140 p. Dissertação (Mestrado) — Universidade de São Paulo, São PauloGoogle Scholar
  46. Miranda LB, Castro Filho BM (1988) Estudos oceanográficos na região sudeste nas três últimas décadas e projeções futuras. BOLETIM IG-USP São Paulo/SP. 6:23–31Google Scholar
  47. Noble M, Butman B (1983) On the longshelf structure and dynamics of subtidal currents on the eastern United States continental shelf. J Phys Oceanogr 13:2125–2146CrossRefGoogle Scholar
  48. Owens WB (1985) A statistical description of the vertical and horizontal structure of eddy variability on the edge of the gulf stream recirculation. J Phys Oceanogr 15(2):195–205CrossRefGoogle Scholar
  49. Owens WB (1990) Observations and EOF analysis of low-frequency variability in the western part of the gulf-stream recirculation. J Phys Oceanogr 20(5):646–656CrossRefGoogle Scholar
  50. Rocha CB, Da Silveira ICA, Castro BM, Lima JAM (2014) Vertical structure, energetics, and dynamics of the Brazil Current System at 22 S-28 S. J Geophys Res Oceans 119:25–69CrossRefGoogle Scholar
  51. Schott FA, Fischer J, Stramma L (1998) Transports and pathways of the upper-layer circulation in the western tropical Atlantic. J Phys Oceanogr 28(10):1904–1928CrossRefGoogle Scholar
  52. Shearman K, Lentz SJ (2003) Dynamics of mean and subtidal flow on the New England shelf. J Geophys Res 108(C8):3281.  https://doi.org/10.1029/2002JC001417 CrossRefGoogle Scholar
  53. Signorini SR, Miranda LB (1983) Tidal and low frequency currents near the shelf break: Northeastern coast of Brazil. J Phys Oceanogr, Washington, DC 13(11):2107–2115CrossRefGoogle Scholar
  54. Silva PKO, Aragao MRS, Magaly MF, Silva AB (2010) Caracterização da variabilidade do vento no aeroporto internacional de Fortaleza, Ceará: Análise de velocidade. In: XVI Congresso Brasileiro de Meteorologia. Universidade Federal do Pará - Belém. p. 1–4Google Scholar
  55. Smith SD (1980) Wind stress and heat flux over the ocean in gale force winds. J Phys Oceanogr 10:709–726CrossRefGoogle Scholar
  56. Smith SD (1988) Coefficients for sea surface wind stress, heat flux, and wind profiles as a function of wind speed and temperature. J Geophys Res 93(C12):15467–15472CrossRefGoogle Scholar
  57. Soutelino RG, Da Silveira ICA, Gangopadhyay A, Miranda JA (2011) Is the Brazil current eddy-dominated to the north of 20 S? Geophys Res Lett 38:L03607CrossRefGoogle Scholar
  58. Soutelino RG, Gangopadhyay A, Da Silveira ICA (2013) The roles of vertical shear and topography on the eddy formation near the site of origin of the Brazil current. Cont Shelf Res 70:46–60, 2013CrossRefGoogle Scholar
  59. Thompson KR, Pugh DT (1986) The subtidal behavior of the Celtic Sea—Part II. Currents. Cont Shelf Res 5:321–346CrossRefGoogle Scholar
  60. Walters RA, Heston C (1982) Removing tidal-period variations from time-series data using low-pass digital filters. J Phys Oceanogr 12(1):112–115CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratório de Hidrodinâmica Costeira Estuarina e de Águas Interiores (LHiCEAI) do Instituto de Ciências do Mar (ICMar)Universidade Federal do Maranhão (UFMA) Campus do BacangaSão LuísBrazil
  2. 2.Laboratório de Hidrodinâmica Costeira (LHiCO) do Instituto Oceanográfico (IO)Universidade de São Paulo (USP)São PauloBrazil
  3. 3.Laboratório de Biogeoquímica Costeira (LBC) do Instituto de Ciências do Mar (LABOMAR)Universidade Federal do Ceará (UFC)FortalezaBrazil

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