English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/89913
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Physical and biogeochemical forcing of oxygen and nitrate changes during El Niño/El Viejo and La Niña/La Vieja upper-ocean phases in the tropical eastern South Pacific along 86º W

AutorLlanillo, P. J. ; Karstensen, J.; Pelegrí, Josep Lluís ; Stramma, L.
Fecha de publicaciónoct-2013
EditorEuropean Geosciences Union
CitaciónBiogeosciences 10: 6339-6355 (2013)
ResumenTemporal changes in the water mass distribution and biogeochemical signals in the tropical eastern South Pacific are investigated with the help of an extended optimum multi-parameter (OMP) analysis, a technique for inverse modeling of mixing and biogeochemical processes through a multidimensional least-square fit. Two ship occupations of a meridional section along 85 50' W from 14 S to 1 N are analysed during relatively warm (El Niño/El Viejo, March 1993) and cold (La Niña/La Vieja, February 2009) upper-ocean phases. The largest El Niño-Southern Oscillation (ENSO) impact was found in the water properties and water mass distribution in the upper 200 m north of 10 S. ENSO promotes the vertical motion of the oxygen minimum zone (OMZ) associated with the hypoxic equatorial subsurface water (ESSW). During a cold phase the core of the ESSW is found at shallower layers, replacing shallow (top 200 m) subtropical surface water (STW). The heave of isopycnals due to ENSO partially explains the intrusion of oxygen-rich and nutrient-poor antarctic intermediate water (AAIW) into the depth range of 150-500 m. The other cause of the AAIW increase at shallower depths is that this water mass flowed along shallower isopycnals in 2009. The shift in the vertical location of AAIW reaching the OMZ induces changes in the amount of oxygen advected and respired inside the OMZ: the larger the oxygen supply, the greater the respiration and the lower the nitrate loss through denitrification. Variations in the intensity of the zonal currents in the equatorial current system, which ventilates the OMZ from the west, are used to explain the patchy latitudinal changes of seawater properties observed along the repeated section. Significant changes reach down to 800 m, suggesting that decadal variability (Pacific decadal oscillation) is also a potential driver in the observed variability. © 2013 Author(s)
Descripción17 pages, 10 figures, 1 table, supplementary material related to this article is available online at http://www.biogeosciences.net/10/6339/2013/bg-10-6339-2013-supplement.pdf
Versión del editorhttp://dx.doi.org/10.5194/bg-10-6339-2013
URIhttp://hdl.handle.net/10261/89913
DOI10.5194/bg-10-6339-2013
Identificadoresdoi: 10.5194/bg-10-6339-2013
issn: 1726-4170
e-issn: 1726-4189
Aparece en las colecciones: (ICM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Llanillo_et_al_2013.pdf10,45 MBAdobe PDFVista previa
Visualizar/Abrir
Llanillo_et_al_2013_supplement.pdf311,29 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.