Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile

Abstract: The inter-annual variability of oceanographic conditions and phytoplankton abundance and biomass was studied using 10 years (1986-1996) of in situ observations at a fixed station in Valparaíso Bay (~33ºS). The time series analysis revealed that strong S-SW winds drive a quasi-permanent upw...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Aparicio-Rizzo,Pilar, Masotti,Italo
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2019
Materias:	Phytoplankton upwelling Aconcagua River Valparaíso Bay ENSO
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572019000100070
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0718-19572019000100070
record_format	dspace
spelling	oai:scielo:S0718-195720190001000702019-07-31Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central ChileAparicio-Rizzo,PilarMasotti,Italo Phytoplankton upwelling Aconcagua River Valparaíso Bay ENSO Abstract: The inter-annual variability of oceanographic conditions and phytoplankton abundance and biomass was studied using 10 years (1986-1996) of in situ observations at a fixed station in Valparaíso Bay (~33ºS). The time series analysis revealed that strong S-SW winds drive a quasi-permanent upwelling activity that maintain the nutrients availability in the water column to fuel the phytoplankton in the bay. The most important changes in bio-oceanographic conditions were observed during 1987 El Niño event, which was characterized by higher temperatures but lower values for salinity, nitrate, and phosphate concentrations, together with a decrease of phytoplankton biomass compared to 1988 La Niña event when colder, saltier, and nutrient-rich upwelled water were observed. High Aconcagua River discharges were observed during the El Niño conditions (1987-1988 and 1993), which led to a decrease in surface salinity and a high abundance of dinoflagellates. Two periods with differences in bio-oceanographic conditions were observed; 1988-1992 showed lower temperatures but higher nutrients (nitrate), phytoplankton biomass and abundance of diatoms than 1993-1996 period. Throughout the study period, positive trends in upwelling activity was registered accompanied by a fall in phytoplankton biomass and dinoflagellate abundance. This paper provides new evidences concerning the influence of El Niño Southern Oscillation (ENSO) in phytoplankton and oceanographic conditions in the coastal upwelling off central Chile.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.54 n.1 20192019-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572019000100070en10.22370/rbmo.2019.54.1.1495
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Phytoplankton upwelling Aconcagua River Valparaíso Bay ENSO
spellingShingle	Phytoplankton upwelling Aconcagua River Valparaíso Bay ENSO Aparicio-Rizzo,Pilar Masotti,Italo Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile
description	Abstract: The inter-annual variability of oceanographic conditions and phytoplankton abundance and biomass was studied using 10 years (1986-1996) of in situ observations at a fixed station in Valparaíso Bay (~33ºS). The time series analysis revealed that strong S-SW winds drive a quasi-permanent upwelling activity that maintain the nutrients availability in the water column to fuel the phytoplankton in the bay. The most important changes in bio-oceanographic conditions were observed during 1987 El Niño event, which was characterized by higher temperatures but lower values for salinity, nitrate, and phosphate concentrations, together with a decrease of phytoplankton biomass compared to 1988 La Niña event when colder, saltier, and nutrient-rich upwelled water were observed. High Aconcagua River discharges were observed during the El Niño conditions (1987-1988 and 1993), which led to a decrease in surface salinity and a high abundance of dinoflagellates. Two periods with differences in bio-oceanographic conditions were observed; 1988-1992 showed lower temperatures but higher nutrients (nitrate), phytoplankton biomass and abundance of diatoms than 1993-1996 period. Throughout the study period, positive trends in upwelling activity was registered accompanied by a fall in phytoplankton biomass and dinoflagellate abundance. This paper provides new evidences concerning the influence of El Niño Southern Oscillation (ENSO) in phytoplankton and oceanographic conditions in the coastal upwelling off central Chile.
author	Aparicio-Rizzo,Pilar Masotti,Italo
author_facet	Aparicio-Rizzo,Pilar Masotti,Italo
author_sort	Aparicio-Rizzo,Pilar
title	Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile
title_short	Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile
title_full	Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile
title_fullStr	Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile
title_full_unstemmed	Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile
title_sort	inter-annual variability of oceanographic conditions and phytoplankton in valparaíso bay (~33°s), central chile
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572019000100070
work_keys_str_mv	AT apariciorizzopilar interannualvariabilityofoceanographicconditionsandphytoplanktoninvalparaisobay33scentralchile AT masottiitalo interannualvariabilityofoceanographicconditionsandphytoplanktoninvalparaisobay33scentralchile
_version_	1714202384655187968

Inter-annual variability of oceanographic conditions and phytoplankton in Valparaíso Bay (~33°S), central Chile

Ejemplares similares