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Volumn 53, Issue 3-4, 2005, Pages 129-146

A NUMERICAL STUDY OF THE PLATA RIVER PLUME ALONG THE SOUTHEASTERN SOUTH AMERICAN CONTINENTAL SHELF

Author keywords

Buoyancy Plume; Eastern South America Continental Shelf; Princeton Ocean Model; Rio de la Plata; South Brazil Bight; South Brazilian Shelf

Indexed keywords


EID: 46149099426     PISSN: 16798759     EISSN: 1982436X     Source Type: Journal    
DOI: 10.1590/S1679-87592005000200004     Document Type: Article
Times cited : (48)

References (64)
  • 1
    • 0037252723 scopus 로고    scopus 로고
    • Surface circulation and kinetic energy in the SW Atlantic obtained by drifters
    • Assireu, A. T.; Stevenson, M. R. & Stech, J. L. 2003. Surface circulation and kinetic energy in the SW Atlantic obtained by drifters. Continent. Shelf Res., 23:145–157.
    • (2003) Continent. Shelf Res , vol.23 , pp. 145-157
    • Assireu, A. T.1    Stevenson, M. R.2    Stech, J. L.3
  • 3
    • 0000157495 scopus 로고
    • A description of a three–dimensional coastal ocean circulation model
    • Heaps, N. S. (Ed), Wasnhington, DC., American Geophysical Union
    • Blumberg, A. F. & Mellor, G. L. 1987. A description of a three–dimensional coastal ocean circulation model. In: Heaps, N. S. (Ed.), Three–dimensional coastal ocean models. Wasnhington, DC., American Geophysical Union. 208p.
    • (1987) Three–dimensional coastal ocean models , pp. 208
    • Blumberg, A. F.1    Mellor, G. L.2
  • 4
    • 0029510731 scopus 로고
    • Water mass characteristics and geostrophic circulation in the South Brazil Bight – Summer of 1991
    • 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., 100 (C9):18537–18550.
    • (1995) J. Geophys. Res , vol.100 , Issue.C9 , pp. 18537-18550
    • Campos, E. J. D.1    Gonçalves, J. E.2    Ikeda, Y.3
  • 7
    • 0032720758 scopus 로고    scopus 로고
    • Interannual variability of the sea surface temperature in the South Brazil Bight
    • Campos, E. J. D.; Lentini, C. A. D.; Miller, J. L. & Piola, A. R. 1999. Interannual variability of the sea surface temperature in the South Brazil Bight. Geophys. Res. Letters, 26(14):2061–2064.
    • (1999) Geophys. Res. Letters , vol.26 , Issue.14 , pp. 2061-2064
    • Campos, E. J. D.1    Lentini, C. A. D.2    Miller, J. L.3    Piola, A. R.4
  • 8
    • 0029535517 scopus 로고
    • Wind–forced sea level variability on the southeast Brazilian shelf
    • Castro, B. M. & Lee, T. N. 1995. Wind–forced sea level variability on the southeast Brazilian shelf. J. Geophys. Res., 100 (C8):16045-16056.
    • (1995) J. Geophys. Res , vol.100 , Issue.C8 , pp. 16045-16056
    • Castro, B. M.1    Lee, T. N.2
  • 9
    • 0001730289 scopus 로고
    • Wind–driven motion near inner shelf fronts
    • Chao, S.-Y. 1987. Wind–driven motion near inner shelf fronts. J. Geophys. Res., 92 (C4):3849–3860.
    • (1987) J. Geophys. Res , vol.92 , Issue.C4 , pp. 3849-3860
    • Chao, S.-Y.1
  • 10
    • 0023767848 scopus 로고
    • River–forced estuarine plumes
    • Chao, S.-Y. 1988a. River–forced estuarine plumes. J. Phys. Oceanogr., 18:72–88.
    • (1988) J. Phys. Oceanogr , vol.18 , pp. 72-88
    • Chao, S.-Y.1
  • 11
    • 0023777337 scopus 로고
    • Wind-driven motion of estuarine plumes
    • Chao, S.-Y. 1988b. Wind-driven motion of estuarine plumes. J. Phys. Oceanogr., 18:1144–1166.
    • (1988) J. Phys. Oceanogr , vol.18 , pp. 1144-1166
    • Chao, S.-Y.1
  • 13
    • 0028982387 scopus 로고
    • Freshwater outflow and Subtropical Convergence influence on phytoplankton biomass on the southern Brazilian continental shelf
    • Ciotti, A. M.; Odebrecht, C.; Fillmann, G. & Möller, O. O. 1995. Freshwater outflow and Subtropical Convergence influence on phytoplankton biomass on the southern Brazilian continental shelf. Continent. Shelf Res., 15(14):1737–1756.
    • (1995) Continent. Shelf Res , vol.15 , Issue.14 , pp. 1737-1756
    • Ciotti, A. M.1    Odebrecht, C.2    Fillmann, G.3    Möller, O. O.4
  • 14
    • 0021166624 scopus 로고
    • Circulation induced by river inflow in well mixed water over a sloping continental shelf
    • Csanady, G. T. 1984. Circulation induced by river inflow in well mixed water over a sloping continental shelf. J. Phys. Oceanogr., 14:1703–1711.
    • (1984) J. Phys. Oceanogr , vol.14 , pp. 1703-1711
    • Csanady, G. T.1
  • 15
    • 0029870141 scopus 로고    scopus 로고
    • ENSO–Controlled flooding in the Paraná River (1904– 1991)
    • Depetris, P. J.; Kempe, S.; Latif, M. & Mook, W. G. 1996. ENSO–Controlled flooding in the Paraná River (1904– 1991). Naturwissenschaften, 83:127–129.
    • (1996) Naturwissenschaften , vol.83 , pp. 127-129
    • Depetris, P. J.1    Kempe, S.2    Latif, M.3    Mook, W. G.4
  • 16
    • 0035056912 scopus 로고    scopus 로고
    • Response of a river plume during an upwelling favorable wind event
    • Fong, D. A. & Geyer, W. R. 2001. Response of a river plume during an upwelling favorable wind event. J. Geophys. Res, 106 (C1):1067–1084.
    • (2001) J. Geophys. Res , vol.106 , Issue.C1 , pp. 1067-1084
    • Fong, D. A.1    Geyer, W. R.2
  • 17
    • 0036506332 scopus 로고    scopus 로고
    • The alongshore transport of freshwater in a surface-trapped river plume
    • Fong, D. A. & Geyer, W. R. 2002. The alongshore transport of freshwater in a surface-trapped river plume. J. Phys. Oceanogr., 32:957–972.
    • (2002) J. Phys. Oceanogr , vol.32 , pp. 957-972
    • Fong, D. A.1    Geyer, W. R.2
  • 18
    • 0030153485 scopus 로고    scopus 로고
    • Study of the Rio de la Plata turbidity front, Part I: spatial and temporal distribution
    • Framiñan, M. B. & Brown, O. B. 1996. Study of the Rio de la Plata turbidity front, Part I: spatial and temporal distribution. Continent. Shelf Res., 16 (10):1259–1282.
    • (1996) Continent. Shelf Res , vol.16 , Issue.10 , pp. 1259-1282
    • Framiñan, M. B.1    Brown, O. B.2
  • 19
    • 0026311454 scopus 로고
    • Surface cyclogenesis over South America
    • Gan, M. A. & Rao, V. B. 1991. Surface cyclogenesis over South America. Mon. Weath. Rev., 119:1293–1302.
    • (1991) Mon. Weath. Rev , vol.119 , pp. 1293-1302
    • Gan, M. A.1    Rao, V. B.2
  • 20
    • 0023157914 scopus 로고
    • Estuary, plumes and fronts in shelf waters: A layer model
    • Garvine, R. W. 1987. Estuary, plumes and fronts in shelf waters: A layer model. J. Phys. Oceanogr., 17:1877– 1896.
    • (1987) J. Phys. Oceanogr , vol.17 , pp. 1877-1896
    • Garvine, R. W.1
  • 21
    • 0033370409 scopus 로고    scopus 로고
    • Penetration of buoyant coastal discharge onto the continental shelf: A numerical model experiment
    • Garvine, R. W. 1999. Penetration of buoyant coastal discharge onto the continental shelf: A numerical model experiment. J. Phys. Oceanogr., 29:1892–1909.
    • (1999) J. Phys. Oceanogr , vol.29 , pp. 1892-1909
    • Garvine, R. W.1
  • 22
    • 0034992017 scopus 로고    scopus 로고
    • The impact of model configuration in studies of buoyant coastal discharge
    • Garvine, R. W. 2001. The impact of model configuration in studies of buoyant coastal discharge. J Mar. Res., 59:193–225.
    • (2001) J Mar. Res , vol.59 , pp. 193-225
    • Garvine, R. W.1
  • 24
    • 0141906405 scopus 로고    scopus 로고
    • The effects of the alongshore wind stress on the top-to-bottom front along the Southern Brazilian coast: a two-dimensional modelling approach
    • Ghisolfi, R. D. & McKee, W. D. 2003. The effects of the alongshore wind stress on the top-to-bottom front along the Southern Brazilian coast: a two-dimensional modelling approach. Continent. Shelf Res., 23:1401– 1424.
    • (2003) Continent. Shelf Res , vol.23 , pp. 1401-1424
    • Ghisolfi, R. D.1    McKee, W. D.2
  • 25
    • 0032216278 scopus 로고    scopus 로고
    • Precipitation anomalies in Southern Brazil associated with El Niño and La Niña events
    • T
    • Grimm, A. M.; Ferraz, S. E. & T., Gomes, J. 1998. Precipitation anomalies in Southern Brazil associated with El Niño and La Niña events. J. Climate, 11:2863– 2880.
    • (1998) J. Climate , vol.11 , pp. 2863-2880
    • Grimm, A. M.1    Ferraz, S. E.2    Gomes, J.3
  • 26
  • 28
    • 0032523653 scopus 로고    scopus 로고
    • The Columbia River plume study: Subtidal variability in the velocity and salinity fields
    • Hickey, B. M.; Pietrafesa, L. J.; Jay, D. A. & Boicourt, W. C. 1998. The Columbia River plume study: Subtidal variability in the velocity and salinity fields. J. Geophys. Res., 103(C5):10339–10368.
    • (1998) J. Geophys. Res , vol.103 , Issue.C5 , pp. 10339-10368
    • Hickey, B. M.1    Pietrafesa, L. J.2    Jay, D. A.3    Boicourt, W. C.4
  • 29
  • 30
    • 0029656635 scopus 로고    scopus 로고
    • The fate of river discharge on the continental shelf. 2. Transport of coastal low-salinity waters under realistic wind and tidal forcing
    • Kourafalou, V. H.; Lee, T. N.; Oey, L.-Y. & Wang, J. D. 1996a. The fate of river discharge on the continental shelf. 2. Transport of coastal low-salinity waters under realistic wind and tidal forcing. J. Geophys. Res., 101 (C2):3435–3455.
    • (1996) J. Geophys. Res , vol.101 , Issue.C2 , pp. 3435-3455
    • Kourafalou, V. H.1    Lee, T. N.2    Oey, L.-Y.3    Wang, J. D.4
  • 31
    • 0029656647 scopus 로고    scopus 로고
    • The fate of river discharge on the continental shelf. 1. Modeling the river plume and the inner shelf coastal current
    • Kourafalou, V. H.; Oey, L.-Y.; Wang, J. D. & Lee, T. N., 1996b. The fate of river discharge on the continental shelf. 1. Modeling the river plume and the inner shelf coastal current. J. Geophys. Res., 101(C2):3415–3434.
    • (1996) J. Geophys. Res , vol.101 , Issue.C2 , pp. 3415-3434
    • Kourafalou, V. H.1    Oey, L.-Y.2    Wang, J. D.3    Lee, T. N.4
  • 32
    • 0035187868 scopus 로고    scopus 로고
    • Sea surface temperature anomalies on the Western South Atlantic from 1982 to 1994
    • Lentini, C. A. D., Podestá, G. G., Campos, E. J. D. & Olson, D. B., 2001. Sea surface temperature anomalies on the Western South Atlantic from 1982 to 1994. Continent. Shelf Res., 21(1):89–112.
    • (2001) Continent. Shelf Res , vol.21 , Issue.1 , pp. 89-112
    • Lentini, C. A. D.1    Podestá, G. G.2    Campos, E. J. D.3    Olson, D. B.4
  • 33
    • 0028976390 scopus 로고
    • The Amazon river plume during AMASSEDS: Subtidal current variability and the importance of wind forcing
    • Lentz, S. J. 1995. The Amazon river plume during AMASSEDS: Subtidal current variability and the importance of wind forcing. J. Geophys. Res., 100(C2):2377–2390.
    • (1995) J. Geophys. Res , vol.100 , Issue.C2 , pp. 2377-2390
    • Lentz, S. J.1
  • 34
    • 0028976399 scopus 로고
    • Lagrangian flow observations of the Amazon River discharge into the North Atlantic
    • Limeburner, R.; Beardsley, R. C.; Soares, I. D.; Lentz, S. J. & Candela, J. 1995. Lagrangian flow observations of the Amazon River discharge into the North Atlantic. J. Geophys. Res. 100(C2):2401–2416.
    • (1995) J. Geophys. Res , vol.100 , Issue.C2 , pp. 2401-2416
    • Limeburner, R.1    Beardsley, R. C.2    Soares, I. D.3    Lentz, S. J.4    Candela, J.5
  • 35
    • 0030421072 scopus 로고    scopus 로고
    • Probable causes of recruitment failure of the Brazilian Sardine population in the 1974/75 spawning season
    • Matsuura, Y. 1996. Probable causes of recruitment failure of the Brazilian Sardine population in the 1974/75 spawning season. South African J. Mar. Sci., 17:29–35.
    • (1996) South African J. Mar. Sci , vol.17 , pp. 29-35
    • Matsuura, Y.1
  • 36
    • 0000402951 scopus 로고
    • Streamflow in Southeastern South America and the Southern Oscillation
    • Mechoso, C. R. & Iribarren, G. P. 1992. Streamflow in Southeastern South America and the Southern Oscillation. J. Climate, 5:1535–1539.
    • (1992) J. Climate , vol.5 , pp. 1535-1539
    • Mechoso, C. R.1    Iribarren, G. P.2
  • 38
    • 0020330926 scopus 로고
    • Development of a tubulence closure model for geophysical fluid problems
    • Mellor, G. L. & Yamada, T. 1982. Development of a tubulence closure model for geophysical fluid problems. Rev. Geophys Space Phys., 20(4):851–875.
    • (1982) Rev. Geophys Space Phys , vol.20 , Issue.4 , pp. 851-875
    • Mellor, G. L.1    Yamada, T.2
  • 41
    • 0038387889 scopus 로고
    • Dynamical properties of buoyancy–driven coastal current
    • Münchow, A. & Garvine, R. W. 1993. Dynamical properties of buoyancy–driven coastal current. J. Geophys. Res., 98 (C11):20063–20077.
    • (1993) J. Geophys. Res , vol.98 , Issue.C11 , pp. 20063-20077
    • Münchow, A.1    Garvine, R. W.2
  • 42
    • 0026268986 scopus 로고
    • A numerical model for tides and storm surges in the Rio de la Plata estuary
    • O’Connor, W. P. 1991. A numerical model for tides and storm surges in the Rio de la Plata estuary. Cont. Shelf Res., 11 (12):1491–1508.
    • (1991) Cont. Shelf Res , vol.11 , Issue.12 , pp. 1491-1508
    • O’Connor, W. P.1
  • 43
    • 0027837393 scopus 로고
    • Subtidal variability of estuarine outflow, plume and coastal current: a model study
    • Oey, L.-Y. & Mellor, G. L. 1993. Subtidal variability of estuarine outflow, plume and coastal current: a model study. J. Phys. Oceanogr., 23:164–171.
    • (1993) J. Phys. Oceanogr , vol.23 , pp. 164-171
    • Oey, L.-Y.1    Mellor, G. L.2
  • 44
    • 0016870918 scopus 로고
    • A simple boundary condition for unbounded hyperbolic flows
    • Orlanski, I. 1976. A simple boundary condition for unbounded hyperbolic flows. J. Comput.Phys., 21:251– 269.
    • (1976) J. Comput.Phys , vol.21 , pp. 251-269
    • Orlanski, I.1
  • 45
    • 0033669856 scopus 로고    scopus 로고
    • On the implementation of open boundary conditions for a general circulation model: The three–dimensional case
    • Palma, E. D. & Matano, R. P. 2000. On the implementation of open boundary conditions for a general circulation model: The three–dimensional case. J. Geophys. Res., 105 (C4):8605–8627.
    • (2000) J. Geophys. Res , vol.105 , Issue.C4 , pp. 8605-8627
    • Palma, E. D.1    Matano, R. P.2
  • 47
    • 76949100030 scopus 로고    scopus 로고
    • Assessment of Santa Catarina shelf currents through the analysis of indirect measurements
    • Pimenta, F. M.; Melo, E.; Franco, D. & Zavialov, P. O. 2004. Assessment of Santa Catarina shelf currents through the analysis of indirect measurements. J. Coastal Res. SI, 39:651-655.
    • (2004) J. Coastal Res. SI , vol.39 , pp. 651-655
    • Pimenta, F. M.1    Melo, E.2    Franco, D.3    Zavialov, P. O.4
  • 48
    • 33847709216 scopus 로고    scopus 로고
    • El impacto del Plata sobre la plataforma continental
    • Schnak, E. J. (Ed), Assoc. Bonaerense de Científicos, Fac. de Cs. Naturales y Museo de la Plata, La Plata, Argentina
    • Piola, A. R. 2002. El impacto del Plata sobre la plataforma continental. In: Schnak, E. J. (Ed.), El Niño: sus impactos en el Plata y en la región pampeana. Vol. 1. Assoc. Bonaerense de Científicos, Fac. de Cs. Naturales y Museo de la Plata, La Plata, Argentina.
    • (2002) El Niño: sus impactos en el Plata y en la región pampeana , vol.1
    • Piola, A. R.1
  • 52
    • 0033402960 scopus 로고    scopus 로고
    • Observations of a pulsed buoyancy current downstream of Chesapeake Bay
    • Rennie, S. E.; Largier, J. L. & Lentz, S. J. 1999. Observations of a pulsed buoyancy current downstream of Chesapeake Bay. J. Geophys. Res., 104 (C8):18227–18240.
    • (1999) J. Geophys. Res , vol.104 , Issue.C8 , pp. 18227-18240
    • Rennie, S. E.1    Largier, J. L.2    Lentz, S. J.3
  • 53
    • 0000335197 scopus 로고
    • Global and regional scale precipitation patterns associated with the El Niño/Southern Oscillation
    • Ropelewski, C. F. & Halpert, M. S. 1987. Global and regional scale precipitation patterns associated with the El Niño/Southern Oscillation. Monthly Weather Review, 115:1607–1626.
    • (1987) Monthly Weather Review , vol.115 , pp. 1607-1626
    • Ropelewski, C. F.1    Halpert, M. S.2
  • 54
    • 0035211107 scopus 로고    scopus 로고
    • Fresh water delivery to the continental shelf and subsequent mixing: An observational study
    • Sanders, T. M. & Garvine, R. W. 2001. Fresh water delivery to the continental shelf and subsequent mixing: An observational study. J. Geophys. Res., 106 (C11):27087– 27101.
    • (2001) J. Geophys. Res , vol.106 , Issue.C11 , pp. 27087-27101
    • Sanders, T. M.1    Garvine, R. W.2
  • 55
    • 84981604811 scopus 로고
    • Cyclonic vortices over South America
    • Satyamurty, P.; Ferreira, C. C. & Gan, M. A. 1990. Cyclonic vortices over South America. Tellus, 42 (A):194–201.
    • (1990) Tellus , vol.42 , Issue.A , pp. 194-201
    • Satyamurty, P.1    Ferreira, C. C.2    Gan, M. A.3
  • 56
    • 4544259622 scopus 로고    scopus 로고
    • A numerical study of the barotropical circulation of the Rio de la Plata estuary: sensitivity to bathymetry, the Earth’s rotation and low frequency wind variability
    • Simionato, C. G.; Dragani, W.; Meccia, V. & Nuñez, M. 2004. A numerical study of the barotropical circulation of the Rio de la Plata estuary: sensitivity to bathymetry, the Earth’s rotation and low frequency wind variability. Estuar. coast. Shelf Sci., 61:261–273.
    • (2004) Estuar. coast. Shelf Sci , vol.61 , pp. 261-273
    • Simionato, C. G.1    Dragani, W.2    Meccia, V.3    Nuñez, M.4
  • 57
    • 0035392323 scopus 로고    scopus 로고
    • The salinity front of the Río de la Plata – a numerical case study for winter and summer conditions
    • Simionato, C. G.; Nuñez, M. N. & Engel, M. 2001. The salinity front of the Río de la Plata – a numerical case study for winter and summer conditions. Geophys. Res. Letters, 28:2641–2644.
    • (2001) Geophys. Res. Letters , vol.28 , pp. 2641-2644
    • Simionato, C. G.1    Nuñez, M. N.2    Engel, M.3
  • 58
    • 0028870922 scopus 로고
    • Semidiurnal switching of stratification in the region of freshwater influence of the Rhine
    • Simpson, J. H. & Souza, A. J. 1995. Semidiurnal switching of stratification in the region of freshwater influence of the Rhine. J. Geophys. Res., 100(C4):7037–7044.
    • (1995) J. Geophys. Res , vol.100 , Issue.C4 , pp. 7037-7044
    • Simpson, J. H.1    Souza, A. J.2
  • 59
    • 0035198508 scopus 로고    scopus 로고
    • Low–frequency currents and water mass spatial distribution on the southern Brazilian shelf
    • Soares, I. & Möller, O. O. 2001. Low–frequency currents and water mass spatial distribution on the southern Brazilian shelf. Continent. Shelf Res.; 21:1785–1814.
    • (2001) Continent. Shelf Res , vol.21 , pp. 1785-1814
    • Soares, I.1    Möller, O. O.2
  • 60
    • 0026445986 scopus 로고
    • The response of the South Brazil Bight to the passage of wintertime cold fronts
    • Stech, J. L. & Lorenzzetti, J. A. 1992. The response of the South Brazil Bight to the passage of wintertime cold fronts. J. Geophys. Res., 97 (C6):9507–9520.
    • (1992) J. Geophys. Res , vol.97 , Issue.C6 , pp. 9507-9520
    • Stech, J. L.1    Lorenzzetti, J. A.2
  • 61
    • 0032213922 scopus 로고    scopus 로고
    • How do cold water biota arrive in a tropical bay near Rio de Janeiro, Brazil?
    • Stevenson, M. R.; Dias-Brito, D.; Stech, J. L. & Kampel, M. 1998. How do cold water biota arrive in a tropical bay near Rio de Janeiro, Brazil? Continent. Shelf Res., 18:1595–1612.
    • (1998) Continent. Shelf Res , vol.18 , pp. 1595-1612
    • Stevenson, M. R.1    Dias-Brito, D.2    Stech, J. L.3    Kampel, M.4
  • 62
    • 0031715208 scopus 로고    scopus 로고
    • Effects of seasonal variations in meteorology and oceanography on the Brazilian sardine fishery
    • Sunye, P. S. & Servain, J. 1998. Effects of seasonal variations in meteorology and oceanography on the Brazilian sardine fishery. Fish. Oceanogr., 7 (2):89–100.
    • (1998) Fish. Oceanogr , vol.7 , Issue.2 , pp. 89-100
    • Sunye, P. S.1    Servain, J.2
  • 63
    • 0036746313 scopus 로고    scopus 로고
    • First direct measurements of currents on the continental shelf of Southern Brazil
    • Zavialov, P.; Möller, O. & Campos, E. 2002. First direct measurements of currents on the continental shelf of Southern Brazil. Continent. Shelf Res., 22:1975– 1986.
    • (2002) Continent. Shelf Res , vol.22 , pp. 1975-1986
    • Zavialov, P.1    Möller, O.2    Campos, E.3
  • 64
    • 0031821874 scopus 로고    scopus 로고
    • An inverse model for seasonal circulation over the Southern Brazilian Shelf: Near–surface velocity from the heat budget
    • Zavialov, P. O.; Ghisolfi, R. D. & Garcia, C. A. E. 1998. An inverse model for seasonal circulation over the Southern Brazilian Shelf: Near–surface velocity from the heat budget. J. Phys. Oceanogr., 28:545–562.
    • (1998) J. Phys. Oceanogr , vol.28 , pp. 545-562
    • Zavialov, P. O.1    Ghisolfi, R. D.2    Garcia, C. A. E.3


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