Artículo

Estamos trabajando para incorporar este artículo al repositorio
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

The Patagonian shelf break marks a transition between relative warm-fresh shelf waters and relative cold-salty Subantarctic Water advected northward by the Malvinas Current. From early spring to late autumn, the outer shelf region is characterized by a band of high chlorophyll concentration that sustains higher trophic levels, including significant fisheries. We analyze time series of current and water mass property observations collected at two moorings deployed at the shelf edge at 41S and 43.8S to investigate what mechanisms lead to temperature variability at the shelf break, and their role on the nutrient supply to the upper layer. The in situ data are combined with satellite-derived observations of sea surface temperature and chlorophyll a to analyze a sharp cooling event at the outer shelf that lasted 10 days and extended 500 km along the outer shelf. The event is consistent with upwelling of cold waters through the base of the mixed layer. The vertical velocity required to explain the observed cooling is 13-29 m d -1 . Satellite-derived sea surface temperature reveals additional cooling events of similar characteristics. Seventy-five percent of these events are concurrent with surface chlorophyll increase over a 5 day period suggesting that cooling events observed at the shelf break are associated with nutrient fluxes that promote the growth of phytoplankton. © 2015. The Authors. Journal of Geophysical Research: Oceans published by Wiley Periodicals, Inc. on behalf of American Geophysical Union.

Registro:

Documento: Artículo
Título:Evidence of upwelling events at the northern Patagonian shelf break
Autor:Valla, D.; Piola, A.R.
Filiación:Departamento Oceanografía, Servicio de Hidrografía Naval, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, UMI/IFAECI, CONICET, Buenos Aires, Argentina
Palabras clave:Malvinas Current; ocean currents; shelf break; South Atlantic; upwelling; advection; chlorophyll a; cooling; mixed layer; mooring system; nutrient cycling; oceanic current; phytoplankton; satellite data; sea surface temperature; shelf break; time series analysis; transition zone; trophic level; upwelling; water exchange; water mass; Atlantic Ocean; Atlantic Ocean (South); Malvinas Current; Patagonia
Año:2015
Volumen:120
Número:11
Página de inicio:7635
Página de fin:7656
DOI: http://dx.doi.org/10.1002/2015JC011002
Título revista:Journal of Geophysical Research: Oceans
Título revista abreviado:J. Geophys. Res. Oceans
ISSN:21699275
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699275_v120_n11_p7635_Valla

Referencias:

  • Acha, E.M., Mianzán, H.W., Guerrero, R.A., Favero, M., Bava, J., Marine fronts at the continental shelves of austral South America, physical and ecological processes (2004) J. Mar. Syst., 44 (12), pp. 83-105
  • Barth, J.A., Bogucki, D., Pierce, S.D., Kosro, P.M., Secondary circulation associated with a shelfbreak front (1998) Geophys. Res. Lett., (15), pp. 2761-2764
  • Barth, J.A., Hebert, D., Dale, A.C., Ullman, D.S., Direct observations of along-isopycnal upwelling and diapycnal velocity at a shelfbreak front (2004) J. Phys. Oceanogr., 34, pp. 543-565
  • Benthuysen, J., Thomas, L., Lentz, S., Rapid generation of upwelling at a shelf break caused by buoyancy shutdown (2015) J. Phys. Oceanogr., 45, pp. 294-312
  • Bianchi, A.A., Bianucci, L., Piola, A.R., Ruiz Pino, D., Schloss, I., Poisson, A., Balestrini, C.F., Vertical stratification and sea-air CO 2 fluxes in the Patagonian shelf (2005) J. Geophys. Res., 110. , C07003
  • Bianchi, A.A., Ruiz-Pino, D., Isbert Perlender, H., Osiroff, A.P., Segura, V., Lutz, V.A., Luz Clara, M., Piola, A.R., Annual balance and seasonal variability of sea-air CO 2 fluxes in the Patagonia Sea: Their relationship with fronts and chlorophyll distribution (2009) J. Geophys. Res., 114, p. C03018
  • Bisbal, G., The Southeast South American shelf large marine ecosystem: Evolution and components (1995) Mar. Policy, 19, pp. 21-38
  • Bogazzi, E., Baldoni, A., Rivas, A., Martos, P., Reta, R., Orensanz, J.M., Lasta, M., Werner, F., Spatial correspondence between areas of concentration of Patagonian scallop (Zygochlamys patagonica) and frontal systems in the southwestern Atlantic (2005) Fish. Oceanogr., 14 (5), pp. 359-376
  • Boyer, T.P., World Ocean Database 2013 (2013) NOAA Atlas NESDIS 72, p. 209. , edited by S. Levitus and A. Mishonov, Silver Spring, Md
  • Carreto, J.I., Lutz, A., V, Carignan, M.O., Cucchi Colleoni, A.D., De Marco, S.G., Hydrography and chlorophyll a in a transect from the coast to the shelf-break in the Argentinian Sea (1995) Cont. Shelf Res., 15, pp. 315-336
  • Chapman, D.C., Lentz, S.J., Trapping of a coastal density front by the bottom boundary layer (1994) J. Phys. Oceanogr., 24 (7), pp. 1464-1479
  • Charo, M., Piola, A.R., Hydrographic data from the GEF Patagonia cruises (2014) Earth Syst. Sci. Data, 6, pp. 265-271
  • Combes, V., Matano, R.P., A two-way nested simulation of the oceanic circulation in the Southwestern Atlantic (2014) J. Geophys. Res. Oceans, 119, pp. 731-756
  • (2009) Atlas Del Mar Patagõnico. Especies y Espacios, , Falabella, V. C. Campagna, and J. Croxall (Eds.), Wildlife Conserv. Soc. and Birdlife Int.; Buenos Aires
  • Franco, B.C., Piola, A.R., Rivas, A.L., Baldoni, A., Pisoni, J.P., Multiple thermal fronts near the Patagonian shelf break (2008) Geophys. Res. Lett., 35, p. L02607
  • Garcia, V.M.T., Garcia, C.A.E., Mata, M.M., Pollery, R., Piola, A.R., Signorini, S., McClain, C.R., Iglesias-Rodríguez, M.D., Environmental factors controlling the phytoplankton blooms at the Patagonia shelfbreak in spring (2008) Deep Sea Res.; Part i, 55, pp. 1150-1166
  • Garreaud, R., Cold air incursions over Subtropical and Tropical South America: A case study (1999) Mon. Weather Rev., 127, pp. 2823-2853
  • Garreaud, R., Cold air incursions over Subtropical and Tropical South America: Mean structure and dynamics (2000) Mon. Weather Rev., 128, pp. 2544-2559
  • Gawarkiewicz, G., Chapman, D.C., The role of stratification in the formation and maintenance of shelf-break fronts (1992) J. Phys. Oceanogr., 22 (7), pp. 753-772
  • Guerrero, R.A., Piola, A.R., Masas de agua en la Plataforma Continental (1997) El Mar Argentino y Sus Recursos Pesqueros, 1, pp. 107-118. , edited by E. Boschi, Inst. Nac. de Invest. y Desarrollo Pesquero, Mar del Plata, Argentina
  • Heileman, S., XVI-55 Patagonian Shelf LME (2009) The UNEP Large Marine Ecosystem Report: A Perspective on Changing Conditions in LMEs of the World's Regional Seas, pp. 735-746. , edited by K. Sherman and G. Hempel, UNEP Reg. Seas Rep. and Stud. 182, U. N. Environ. Programme, Nairobi
  • Houghton, R.W., Lagrangian flow at the foot of a shelfbreak front using a dye tracer injected into the bottom boundary layer (1997) Geophys. Res. Lett., 24, pp. 2035-2038
  • Houghton, R.W., Visbeck, M., Upwelling and convergence in the Middle Atlantic Bight Shelfbreak Front (1998) Geophys. Res. Lett., 25, pp. 2765-2768
  • (2003) IOC, IHO, and BODC, "centenary Edition of the GEBCO Digital Atlas", Published on CD-ROM on Behalf of the Intergovernmental Oceanographic Commission and the International Hydrographic Organization As Part of the General Bathymetric Chart of the Oceans, , British Oceanographic Data Centre, Liverpool
  • Kalnay, E., The NCEP/NCAR 40-year reanalysis project (1996) Bull. Am. Meteorol. Soc., 77, pp. 437-470
  • Longhurst, A., (1998) Ecological Geography of the Sea, , Academic, San Diego, Calif
  • Lutz, V.A., Segura, V., Dogliotti, A.I., Gagliardini, D.A., Bianchi, A.A., Balestrini, C.F., Primary production in the Argentine Sea during spring estimated by field and satellite models (2010) J. Plankton Res., 32, pp. 181-195
  • Matano, R.P., On the separation of the Brazil Current from the coast (1993) J. Phys. Oceanogr., 23 (1), pp. 79-90
  • Matano, R.P., Palma, E.D., On the upwelling of downwelling currents (2008) J. Phys. Oceanogr., 38 (11), pp. 2482-2500
  • Matano, R.P., Palma, E.D., Piola, A.R., The influence of the Brazil and Malvinas Currents on the southwestern Atlantic shelf circulation (2010) Ocean Sci., 6, pp. 983-995
  • Miller, R.N., Matano, R.P., Palma, E.D., Shelfbreak upwelling induced by alongshore currents: Analytical and numerical results (2011) J. Fluid Mech., 686, pp. 239-249
  • Muller-Karger, F.E., Varela, R., Thunell, R., Luerssen, R., Hu, C., Walsh, J.J., The importance of continental margins in the global carbon cycle (2005) Geophys. Res. Lett., 32, p. L01602
  • O'Reilly, J.E., (2000) SeaWiFS Postlaunch Calibration and Validation Analyses, Part 3, SeaWiFS Postlaunch Tech. Rep. Ser, 11. , edited by S. B. Hooker and R. E. Firestone, NASA Tech. Memo. 2000-206892, NASA, Goddard Space Flight Cent.; Greenbelt, Md
  • Palma, E.D., Matano, R.P., A numerical study of the Magellan Plume (2012) J. Geophys. Res., 117, p. C05041
  • Palma, E.D., Matano, R.P., Piola, A.R., A numerical study of the Southwestern Atlantic Shelf circulation: Barotropic response to tidal and wind forcing (2004) J. Geophys. Res., 109, p. C08014
  • Palma, E.D., Matano, R.P., Piola, A.R., A numerical study of the Southwestern Atlantic Shelf circulation: Stratified ocean response to local and offshore forcing (2008) J. Geophys. Res., 113, p. C11010
  • Peterson, R.G., Whitworth, T., The Subantarctic and Polar Fronts in relation to deep water masses through the southwestern Atlantic (1989) J. Geophys. Res., 94, pp. 10817-10838
  • Piola, A.R., Gordon, A.L., Intermediate waters in the southwest South Atlantic (1989) Deep Sea Res.; Part A, 36 (1), pp. 1-16
  • Piola, A.R., Matano, R.P., The South Atlantic Western Boundary Currents Brazil/Falkland (Malvinas) Currents (2001) Encyclopedia of Ocean Sciences, 1, pp. 340-349. , edited by J. M. Steele, S. A. Thorpe, and K. K. Turekian, Academic Press, Boston, Mass
  • Piola, A.R., Martinez Avellaneda, N., Guerrero, R.A., Jardõn, F.P., Palma, E.D., Romero, S.I., Malvinas-slope water intrusions on the northern Patagonia (2010) Ocean Sci., 6, pp. 345-359
  • Piola, A.R., Franco, B.C., Palma, E.D., Saraceno, M., Multiple jets in the Malvinas Current (2013) J. Geophys. Res. Oceans, 118, pp. 2107-2117
  • Podestá, G.P., Utilizaciõn de datos satelitarios en investigaciones oceanográfica y pesqueras en el Océano Atlántico Sudoccidental (1997) El Mar Argentino y Sus Recursos Pesqueros, 1, pp. 195-222. , edited by E. E. Boschi.; Inst. Nac. de Invest. y Desarrollo Pesquero, Mar del Plata, Argentina
  • Reynolds, R.W., Smith, T.M., Liu, C., Chelton, D.B., Casey, K.S., Schlax, M.G., Daily high-resolution-blended analyses for sea surface temperature (2007) J. Clim., 20, pp. 5473-5496
  • Rivas, A.L., Current meter observations in the Argentine Continental Shelf (1997) Cont. Shelf Res., 17, pp. 391-406
  • Rivas, A.L., Piola, A.R., Vertical stratification at the shelf off northern Patagonia (2002) Cont. Shelf Res., 22, pp. 1549-1558
  • Rivas, A.L., Pisoni, J.P., Identification, characteristics and seasonal evolution of surface thermal fronts in the Argentinean Continental Shelf (2010) J. Mar. Syst., 79, pp. 134-143
  • Rodhouse, P.G., Elvidge, C.D., Trathan, P.N., Remote sensing of the global light-fishing fleet: An analysis of interactions with oceanography, other fisheries and predators (2001) Adv. Mar. Biol., 39, pp. 261-303
  • Romero, S.I., Piola, A.R., Charo, M., Garcia, C.A.E., Chlorophyll-A variability off Patagonia based on SeaWiFS data (2006) J. Geophys. Res., 111, p. C05021
  • Saha, S., The NCEP Climate Forecast System Reanalysis (2010) Bull. Am. Meteorol. Soc., 91 (8), pp. 1015-1057
  • Sánchez, R.P., Ciechomski, J.D., Spawning and nursery grounds of pelagic fish species in the sea-shelf off Argentina and adjacent areas (1995) Sci. Mar., 59, pp. 455-478
  • Saraceno, M., Provost, C., Piola, A.R., Bava, J., Gagliardini, A., Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data (2004) J. Geophys. Res., 109, p. C05027
  • Signorini, S.R., Garcia, V.M.T., Piola, A.R., Evangelista, H., McClain, C.R., Garcia, C.A.E., Mata, M.M., Further studies on the physical and biogeochemical causes for large interannual changes in the Patagonian shelf spring-summer phytoplankton bloom biomass (2009) NASA Tech. Memo. NASA/TM-2009-214176, , NASA, Greenbelt, Md
  • Spadone, A., Provost, C., Variations in the Malvinas Current volume transport since October 1992 (2009) J. Geophys. Res., 114, p. C02002
  • Vialard, J., Delecluse, P., An OGCM Study for the TOGA Decade. Part I: Role of Salinity in the Physics of the Western Pacific Fresh Pool (1998) J. Phys. Oceanogr., 28, pp. 1071-1088
  • Vivier, F., Provost, C., Direct velocity measurements in the Malvinas Current (1999) J. Geophys. Res., 104, pp. 21083-21121. , 103
  • Walsh, J.J., Importance of continental margins in the marine biogeochemical cycling of carbon and nitrogen (1991) Nature, 350, pp. 53-55
  • Yu, L., Weller, R.A., Objectively analyzed air-sea heat fluxes for the global ice-free oceans (1981-2005) (2007) Bull. Am. Meteorol. Soc., 88, pp. 527-539
  • Yu, L., Jin, X., Weller, R.A., (2008) Multidecade Global Flux Datasets from the Objectively Analyzed Air-sea Fluxes (OAFlux) Project: Latent and Sensible Heat Fluxes, p. 64. , ocean evaporation, and related surface meteorological variables, OAFlux Proj. Tech. Rep. OA-2008-01, Woods Hole Oceanogr. Inst.; Woods Hole, Mass

Citas:

---------- APA ----------
Valla, D. & Piola, A.R. (2015) . Evidence of upwelling events at the northern Patagonian shelf break. Journal of Geophysical Research: Oceans, 120(11), 7635-7656.
http://dx.doi.org/10.1002/2015JC011002
---------- CHICAGO ----------
Valla, D., Piola, A.R. "Evidence of upwelling events at the northern Patagonian shelf break" . Journal of Geophysical Research: Oceans 120, no. 11 (2015) : 7635-7656.
http://dx.doi.org/10.1002/2015JC011002
---------- MLA ----------
Valla, D., Piola, A.R. "Evidence of upwelling events at the northern Patagonian shelf break" . Journal of Geophysical Research: Oceans, vol. 120, no. 11, 2015, pp. 7635-7656.
http://dx.doi.org/10.1002/2015JC011002
---------- VANCOUVER ----------
Valla, D., Piola, A.R. Evidence of upwelling events at the northern Patagonian shelf break. J. Geophys. Res. Oceans. 2015;120(11):7635-7656.
http://dx.doi.org/10.1002/2015JC011002