Multiscale upwelling forcing cycles and biological response off north-central Chile

The physical forcing of the upwelling along the subtropical west coasts of the continents encompasses a broad range of time scales which shape both phytoplankton biomass (Chl-a) and primary productivity (carbon fixation) changes over any given time interval. The narrow continental shelf and the stee...

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Autores principales:	RUTLLANT,JOSÉ, MONTECINO,VIVIAN
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2002
Materias:	Chile coastal upwelling phytoplankton local and remote upwelling forcing cycles coastal-trapped waves ENSO cycle
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100020
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spelling	oai:scielo:S0716-078X20020001000202002-06-14Multiscale upwelling forcing cycles and biological response off north-central ChileRUTLLANT,JOSÉMONTECINO,VIVIAN Chile coastal upwelling phytoplankton local and remote upwelling forcing cycles coastal-trapped waves ENSO cycle The physical forcing of the upwelling along the subtropical west coasts of the continents encompasses a broad range of time scales which shape both phytoplankton biomass (Chl-a) and primary productivity (carbon fixation) changes over any given time interval. The narrow continental shelf and the steep alongshore orography off north-central Chile provide for a unique combination of year-round, upwelling-favorable winds with quasi-weekly upwelling pulses associated with atmospheric coastal-trapped disturbances (coastal lows). This variability is modulated by intraseasonal oscillations in the depth of the thermo/nutricline, produced by coastal-trapped waves in the ocean, upon which annual (seasons) and interannual (ENSO) cycles are superimposed. During coastal field experiments off Cruz Grande bay (29º S), carried on in November 1987 and 1988 (opposite extremes of the ENSO cycle), mean changes of the phytoplankton-integrated Chl-a (B) and carbon fixation rate (PP) from the active to the relaxed phases of the local upwelling forcing cycle (phyto-pattern) were characterized. Those data were contrasted against similar ones reported off Punta Lengua de Vaca (Coquimbo, 30º S) and off Mejillones peninsula (Antofagasta, 23º S), encompassing different seasons and phases of intraseasonal and interannual (ENSO) cycles from 1992 to 1997. A "warm" phyto-pattern was schematically characterized by a significant increase in B and a quasi-steady evolution of PP from the active to the relaxed phases of one complete upwelling event. Conversely, relative small changes in B and a significant increase in PP characterized a "cold" phyto-pattern. It is proposed here that the ENSO "cold/warm" signal may be offset by more than one opposite "thermal" condition (seasonal and/or intraseasonal) in defining a "warm" or "cold" phyto-pattern associated with a particular cycle of the local upwelling forcinginfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.75 n.1 20022002-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100020en10.4067/S0716-078X2002000100020
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chile coastal upwelling phytoplankton local and remote upwelling forcing cycles coastal-trapped waves ENSO cycle
spellingShingle	Chile coastal upwelling phytoplankton local and remote upwelling forcing cycles coastal-trapped waves ENSO cycle RUTLLANT,JOSÉ MONTECINO,VIVIAN Multiscale upwelling forcing cycles and biological response off north-central Chile
description	The physical forcing of the upwelling along the subtropical west coasts of the continents encompasses a broad range of time scales which shape both phytoplankton biomass (Chl-a) and primary productivity (carbon fixation) changes over any given time interval. The narrow continental shelf and the steep alongshore orography off north-central Chile provide for a unique combination of year-round, upwelling-favorable winds with quasi-weekly upwelling pulses associated with atmospheric coastal-trapped disturbances (coastal lows). This variability is modulated by intraseasonal oscillations in the depth of the thermo/nutricline, produced by coastal-trapped waves in the ocean, upon which annual (seasons) and interannual (ENSO) cycles are superimposed. During coastal field experiments off Cruz Grande bay (29º S), carried on in November 1987 and 1988 (opposite extremes of the ENSO cycle), mean changes of the phytoplankton-integrated Chl-a (B) and carbon fixation rate (PP) from the active to the relaxed phases of the local upwelling forcing cycle (phyto-pattern) were characterized. Those data were contrasted against similar ones reported off Punta Lengua de Vaca (Coquimbo, 30º S) and off Mejillones peninsula (Antofagasta, 23º S), encompassing different seasons and phases of intraseasonal and interannual (ENSO) cycles from 1992 to 1997. A "warm" phyto-pattern was schematically characterized by a significant increase in B and a quasi-steady evolution of PP from the active to the relaxed phases of one complete upwelling event. Conversely, relative small changes in B and a significant increase in PP characterized a "cold" phyto-pattern. It is proposed here that the ENSO "cold/warm" signal may be offset by more than one opposite "thermal" condition (seasonal and/or intraseasonal) in defining a "warm" or "cold" phyto-pattern associated with a particular cycle of the local upwelling forcing
author	RUTLLANT,JOSÉ MONTECINO,VIVIAN
author_facet	RUTLLANT,JOSÉ MONTECINO,VIVIAN
author_sort	RUTLLANT,JOSÉ
title	Multiscale upwelling forcing cycles and biological response off north-central Chile
title_short	Multiscale upwelling forcing cycles and biological response off north-central Chile
title_full	Multiscale upwelling forcing cycles and biological response off north-central Chile
title_fullStr	Multiscale upwelling forcing cycles and biological response off north-central Chile
title_full_unstemmed	Multiscale upwelling forcing cycles and biological response off north-central Chile
title_sort	multiscale upwelling forcing cycles and biological response off north-central chile
publisher	Sociedad de Biología de Chile
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100020
work_keys_str_mv	AT rutllantjose multiscaleupwellingforcingcyclesandbiologicalresponseoffnorthcentralchile AT montecinovivian multiscaleupwellingforcingcyclesandbiologicalresponseoffnorthcentralchile
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Multiscale upwelling forcing cycles and biological response off north-central Chile

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