Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean

We present annual cycles of chlorophyll a, phytoplankton carbon, nitrate and oxygen for Subtropical (STW), Subantarctic (SAW), and Subantarctic Mode (SAMW) waters near Aotearoa New Zealand from data collected by two Biogeochemical (BGC) Argo floats. We develop two simple models of depth-integrated n...

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Autores: Chiswell, S.M., Gutiérrez-Rodríguez, Andrés, Safi, K., Strzepek, R., Décima, M.R., Nodder, S.N.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2022
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/318700
Acesso em linha:http://hdl.handle.net/10261/318700
https://doi.org/10.1016/j.dsr.2022.103834
Access Level:Acceso aberto
Palavra-chave:Medio Marino
Centro Oceanográfico de Gijón
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spelling Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific OceanChiswell, S.M.Gutiérrez-Rodríguez, AndrésSafi, K.Strzepek, R.Décima, M.R.Nodder, S.N.Medio MarinoCentro Oceanográfico de GijónWe present annual cycles of chlorophyll a, phytoplankton carbon, nitrate and oxygen for Subtropical (STW), Subantarctic (SAW), and Subantarctic Mode (SAMW) waters near Aotearoa New Zealand from data collected by two Biogeochemical (BGC) Argo floats. We develop two simple models of depth-integrated net primary production (NPP), tuned against 14C-uptake measurements, to compare with Vertically-Generalised Production Model (VGPM) satellite-based estimates of NPP. One model is the simplest possible, and assumes production is proportional to light multiplied by chlorophyll a concentration. The second model modifies the light response profile to account for photoacclimation. In STW at 30–35°S, enhanced production is initiated in austral autumn when the mixed layer deepens to entrain nutrients into the photic zone. For about half the year, there is substantial production within a deep chlorophyll maximum that sits below the mixed layer. Consequently, depth-integrated NPP is only loosely related to surface biomass as imaged from satellite remote-sensing, and BGC Argo-based model estimates of depth-integrated NPP are about double VGPM estimates. In SAW at 45–55°S, production is initiated when vertical mixing decreases in austral spring. Production is largely within the mixed layer, and depth-integrated phytoplankton biomass and depth-integrated NPP follow surface phytoplankton biomass. Model estimates of depth-integrated NPP based on BGC Argo float profiles are comparable with VGPM estimates for the southern water masses.SI202320232022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/318700https://doi.org/10.1016/j.dsr.2022.103834reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Gijóninfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3187002026-05-22T06:33:51Z
dc.title.none.fl_str_mv Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
title Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
spellingShingle Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
Chiswell, S.M.
Medio Marino
Centro Oceanográfico de Gijón
title_short Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
title_full Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
title_fullStr Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
title_full_unstemmed Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
title_sort Seasonal Cycles of Phytoplankton and Net Primary Production from Biogeochemical Argo Float Data in the South-West Pacific Ocean
dc.creator.none.fl_str_mv Chiswell, S.M.
Gutiérrez-Rodríguez, Andrés
Safi, K.
Strzepek, R.
Décima, M.R.
Nodder, S.N.
author Chiswell, S.M.
author_facet Chiswell, S.M.
Gutiérrez-Rodríguez, Andrés
Safi, K.
Strzepek, R.
Décima, M.R.
Nodder, S.N.
author_role author
author2 Gutiérrez-Rodríguez, Andrés
Safi, K.
Strzepek, R.
Décima, M.R.
Nodder, S.N.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Medio Marino
Centro Oceanográfico de Gijón
topic Medio Marino
Centro Oceanográfico de Gijón
description We present annual cycles of chlorophyll a, phytoplankton carbon, nitrate and oxygen for Subtropical (STW), Subantarctic (SAW), and Subantarctic Mode (SAMW) waters near Aotearoa New Zealand from data collected by two Biogeochemical (BGC) Argo floats. We develop two simple models of depth-integrated net primary production (NPP), tuned against 14C-uptake measurements, to compare with Vertically-Generalised Production Model (VGPM) satellite-based estimates of NPP. One model is the simplest possible, and assumes production is proportional to light multiplied by chlorophyll a concentration. The second model modifies the light response profile to account for photoacclimation. In STW at 30–35°S, enhanced production is initiated in austral autumn when the mixed layer deepens to entrain nutrients into the photic zone. For about half the year, there is substantial production within a deep chlorophyll maximum that sits below the mixed layer. Consequently, depth-integrated NPP is only loosely related to surface biomass as imaged from satellite remote-sensing, and BGC Argo-based model estimates of depth-integrated NPP are about double VGPM estimates. In SAW at 45–55°S, production is initiated when vertical mixing decreases in austral spring. Production is largely within the mixed layer, and depth-integrated phytoplankton biomass and depth-integrated NPP follow surface phytoplankton biomass. Model estimates of depth-integrated NPP based on BGC Argo float profiles are comparable with VGPM estimates for the southern water masses.
publishDate 2022
dc.date.none.fl_str_mv 2022
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/318700
https://doi.org/10.1016/j.dsr.2022.103834
url http://hdl.handle.net/10261/318700
https://doi.org/10.1016/j.dsr.2022.103834
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de Gijón
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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