Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability

Phytoplankton abundance in the surface mixed layer of the coastal ocean responds to environmental changes at various time scales. Here the "warm", "cold" and "neutral" phases of "three environmental cycles" have been jointly considered to assess chlorophyll-a...

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Autores principales:	MONTECINO,VIVIAN, PAREDES,M. ALEJANDRA, PAOLINI,PEDRO, RUTLLANT,JOSÉ
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2006
Materias:	Coastal trapped waves coastal upwelling phytoplankton biomass
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200007
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spelling	oai:scielo:S0716-078X20060002000072006-07-24Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variabilityMONTECINO,VIVIANPAREDES,M. ALEJANDRAPAOLINI,PEDRORUTLLANT,JOSÉ Coastal trapped waves coastal upwelling phytoplankton biomass Phytoplankton abundance in the surface mixed layer of the coastal ocean responds to environmental changes at various time scales. Here the "warm", "cold" and "neutral" phases of "three environmental cycles" have been jointly considered to assess chlorophyll-a (Chl-a) biomass variability for both the active and relaxed phases of the local, wind-driven coastal upwelling: (i) the interannual ENSO cycle (ii) the annual (seasonal) cycle and (iii) the intraseasonal cycle associated with equatorially-sourced, ocean trapped-waves along the coast in northern Chile. The main goal of this study is to quantitatively assess the variability of the depth- integrated Chl-a biomass in the euphotic zone (¾Chl-a) in terms of an overall "environmental condition" over a 50 km upwelling sensitive coastal strip, revisiting published and unpublished Chl-a ship (Cship = Chl-a + Phaeopigments) data. All possible "environmental conditions" combinations were further ranked into seven "environmental indices" ranging from 0 ("absolutely cold") to 6 ("absolutely warm"). Out of 332 samples of ¾Chl-a, 198/134 were obtained during active/relaxed upwelling conditions from which 24/38 and 30/36 samples were associated with the simultaneous occurrence of at least two "cold"/"warm" phases of the three environmental cycles ("cold"/"warm" environmental conditions), respectively. Lower ¾Chl-a values during "cold" and "warm" environmental conditions relative to the "neutral" ones reached statistical significance for both active and relaxed conditions (144/60 samples respectively). Higher turbulent mixing during "cold" environmental conditions and a deeper nutricline during "warm" ones would explain lower ¾Chl-a-values. Satellite chlorophyll (Csat) data obtained in clear skies (active upwelling only), showed a similar distribution to those of ¾Chl-a when classified into the corresponding "environmental indices". These results suggest that during "neutral" (transitional) "environmental conditions", nutrient supply, mean light exposure and mixing thresholds, including biological interactions, could be more effective in producing a higher phytoplankton biomass, in spite of a larger dispersioninfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.79 n.2 20062006-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200007en10.4067/S0716-078X2006000200007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Coastal trapped waves coastal upwelling phytoplankton biomass
spellingShingle	Coastal trapped waves coastal upwelling phytoplankton biomass MONTECINO,VIVIAN PAREDES,M. ALEJANDRA PAOLINI,PEDRO RUTLLANT,JOSÉ Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability
description	Phytoplankton abundance in the surface mixed layer of the coastal ocean responds to environmental changes at various time scales. Here the "warm", "cold" and "neutral" phases of "three environmental cycles" have been jointly considered to assess chlorophyll-a (Chl-a) biomass variability for both the active and relaxed phases of the local, wind-driven coastal upwelling: (i) the interannual ENSO cycle (ii) the annual (seasonal) cycle and (iii) the intraseasonal cycle associated with equatorially-sourced, ocean trapped-waves along the coast in northern Chile. The main goal of this study is to quantitatively assess the variability of the depth- integrated Chl-a biomass in the euphotic zone (¾Chl-a) in terms of an overall "environmental condition" over a 50 km upwelling sensitive coastal strip, revisiting published and unpublished Chl-a ship (Cship = Chl-a + Phaeopigments) data. All possible "environmental conditions" combinations were further ranked into seven "environmental indices" ranging from 0 ("absolutely cold") to 6 ("absolutely warm"). Out of 332 samples of ¾Chl-a, 198/134 were obtained during active/relaxed upwelling conditions from which 24/38 and 30/36 samples were associated with the simultaneous occurrence of at least two "cold"/"warm" phases of the three environmental cycles ("cold"/"warm" environmental conditions), respectively. Lower ¾Chl-a values during "cold" and "warm" environmental conditions relative to the "neutral" ones reached statistical significance for both active and relaxed conditions (144/60 samples respectively). Higher turbulent mixing during "cold" environmental conditions and a deeper nutricline during "warm" ones would explain lower ¾Chl-a-values. Satellite chlorophyll (Csat) data obtained in clear skies (active upwelling only), showed a similar distribution to those of ¾Chl-a when classified into the corresponding "environmental indices". These results suggest that during "neutral" (transitional) "environmental conditions", nutrient supply, mean light exposure and mixing thresholds, including biological interactions, could be more effective in producing a higher phytoplankton biomass, in spite of a larger dispersion
author	MONTECINO,VIVIAN PAREDES,M. ALEJANDRA PAOLINI,PEDRO RUTLLANT,JOSÉ
author_facet	MONTECINO,VIVIAN PAREDES,M. ALEJANDRA PAOLINI,PEDRO RUTLLANT,JOSÉ
author_sort	MONTECINO,VIVIAN
title	Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability
title_short	Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability
title_full	Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability
title_fullStr	Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability
title_full_unstemmed	Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability
title_sort	revisiting chlorophyll data along the coast in north-central chile, considering multiscale environmental variability
publisher	Sociedad de Biología de Chile
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200007
work_keys_str_mv	AT montecinovivian revisitingchlorophylldataalongthecoastinnorthcentralchileconsideringmultiscaleenvironmentalvariability AT paredesmalejandra revisitingchlorophylldataalongthecoastinnorthcentralchileconsideringmultiscaleenvironmentalvariability AT paolinipedro revisitingchlorophylldataalongthecoastinnorthcentralchileconsideringmultiscaleenvironmentalvariability AT rutllantjose revisitingchlorophylldataalongthecoastinnorthcentralchileconsideringmultiscaleenvironmentalvariability
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Revisiting chlorophyll data along the coast in north-central Chile, considering multiscale environmental variability

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