The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea

The Weddell Sea is known to be a CO2 sink due to active biological and physical pumps. Here we study the relationships of phytoplankton biomass and composition and microbial community metabolism, estimated from simulated in situ incubations and from nutrient's difference between surface and sub...

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Detalles Bibliográficos
Autores principales: Di Fiori, Eugenia, Schloss, Irene R., Paparazzo, Flavio Emiliano
Publicado: 2013
Materias:
CO2 dynamics
Community metabolism
Phytoplankton composition
Weddell Sea
Chlorophyll-a concentration
Gross primary production
Microbial communities
Net community productions
Phytoplankton biomass
Primary production
Biomass
Dynamics
Experiments
Metabolism
Microorganisms
Nutrients
Physiology
Phytoplankton
Carbon dioxide
air-sea interaction
biological pump
biomass
carbon dioxide
chlorophyll a
diatom
flagellate
metabolism
microbial community
net primary production
nutrient limitation
phytoplankton
upwelling
warm water
Southern Ocean
Bacillariophyta
Phytomastigophorea
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v82_n_p44_Moreau
http://hdl.handle.net/20.500.12110/paper_09670637_v82_n_p44_Moreau
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09670637_v82_n_p44_Moreau
record_format dspace
spelling paper:paper_09670637_v82_n_p44_Moreau2023-06-08T15:58:43Z The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea Di Fiori, Eugenia Schloss, Irene R. Paparazzo, Flavio Emiliano CO2 dynamics Community metabolism Phytoplankton composition Weddell Sea Chlorophyll-a concentration Gross primary production Microbial communities Net community productions Phytoplankton biomass Phytoplankton composition Primary production Weddell Sea Biomass Dynamics Experiments Metabolism Microorganisms Nutrients Physiology Phytoplankton Carbon dioxide air-sea interaction biological pump biomass carbon dioxide chlorophyll a diatom flagellate metabolism microbial community net primary production nutrient limitation phytoplankton upwelling warm water Southern Ocean Weddell Sea Bacillariophyta Phytomastigophorea The Weddell Sea is known to be a CO2 sink due to active biological and physical pumps. Here we study the relationships of phytoplankton biomass and composition and microbial community metabolism, estimated from simulated in situ incubations and from nutrient's difference between surface and subsurface waters, with δpCO2 in the Weddell Sea, during four austral summers (2002-2005). The δpCO2 was significantly negative throughout the Weddell Sea in 2002 (-17.2±28.1μatm), 2003 (-64.1±31.3μatm), 2004 (-54.9±61.8μatm) and 2005 (-63.8±60μatm), indicating that the Weddell Sea acted as an atmospheric CO2 sink during those summers. The δpCO2 was significantly lower in the south than in the center or north of the Weddell Sea. This was consistent with the significantly higher Chlorophyll-a concentrations (Chl-a) observed in the south (2.3±1.9μgl-1) than in the center (1.3±1.2μgl-1) or north (1.4±1.7μgl-1). In contrast, waters were mainly undersaturated in O2, due to the upwelling of oxygen poor Warm Deep Water (WDW). The negative relationship between the δpCO2 and the %O2 saturation suggested that planktonic metabolic activities played a role in these gases dynamics, along with the upwelling of WDW. However, these relationships could not be observed from the results of the incubation experiments, probably because of different temporal scales between gas exchanges in incubation experiments and in situ CO2 and O2 dynamics. The dynamics of CO2 and O2 were solely related to the net community production (NCP) and to the gross primary production (GPP) when only stations with Chl-a>1μgl-1 were considered. A significant relationship was, however, found between δpCO2 and the primary production until the time of sampling for all stations when estimated from nutrients depletion between surface and subsurface waters. Finally, the distribution of CO2 and O2 were related to the biomass of diatoms and, contrarily to other seas, to the biomass of phytoflagellates. © 2013 Elsevier Ltd. Fil:di Fiori, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Schloss, I.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Paparazzo, F.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v82_n_p44_Moreau http://hdl.handle.net/20.500.12110/paper_09670637_v82_n_p44_Moreau
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic CO2 dynamics
Community metabolism
Phytoplankton composition
Weddell Sea
Chlorophyll-a concentration
Gross primary production
Microbial communities
Net community productions
Phytoplankton biomass
Phytoplankton composition
Primary production
Weddell Sea
Biomass
Dynamics
Experiments
Metabolism
Microorganisms
Nutrients
Physiology
Phytoplankton
Carbon dioxide
air-sea interaction
biological pump
biomass
carbon dioxide
chlorophyll a
diatom
flagellate
metabolism
microbial community
net primary production
nutrient limitation
phytoplankton
upwelling
warm water
Southern Ocean
Weddell Sea
Bacillariophyta
Phytomastigophorea
spellingShingle CO2 dynamics
Community metabolism
Phytoplankton composition
Weddell Sea
Chlorophyll-a concentration
Gross primary production
Microbial communities
Net community productions
Phytoplankton biomass
Phytoplankton composition
Primary production
Weddell Sea
Biomass
Dynamics
Experiments
Metabolism
Microorganisms
Nutrients
Physiology
Phytoplankton
Carbon dioxide
air-sea interaction
biological pump
biomass
carbon dioxide
chlorophyll a
diatom
flagellate
metabolism
microbial community
net primary production
nutrient limitation
phytoplankton
upwelling
warm water
Southern Ocean
Weddell Sea
Bacillariophyta
Phytomastigophorea
Di Fiori, Eugenia
Schloss, Irene R.
Paparazzo, Flavio Emiliano
The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea
topic_facet CO2 dynamics
Community metabolism
Phytoplankton composition
Weddell Sea
Chlorophyll-a concentration
Gross primary production
Microbial communities
Net community productions
Phytoplankton biomass
Phytoplankton composition
Primary production
Weddell Sea
Biomass
Dynamics
Experiments
Metabolism
Microorganisms
Nutrients
Physiology
Phytoplankton
Carbon dioxide
air-sea interaction
biological pump
biomass
carbon dioxide
chlorophyll a
diatom
flagellate
metabolism
microbial community
net primary production
nutrient limitation
phytoplankton
upwelling
warm water
Southern Ocean
Weddell Sea
Bacillariophyta
Phytomastigophorea
description The Weddell Sea is known to be a CO2 sink due to active biological and physical pumps. Here we study the relationships of phytoplankton biomass and composition and microbial community metabolism, estimated from simulated in situ incubations and from nutrient's difference between surface and subsurface waters, with δpCO2 in the Weddell Sea, during four austral summers (2002-2005). The δpCO2 was significantly negative throughout the Weddell Sea in 2002 (-17.2±28.1μatm), 2003 (-64.1±31.3μatm), 2004 (-54.9±61.8μatm) and 2005 (-63.8±60μatm), indicating that the Weddell Sea acted as an atmospheric CO2 sink during those summers. The δpCO2 was significantly lower in the south than in the center or north of the Weddell Sea. This was consistent with the significantly higher Chlorophyll-a concentrations (Chl-a) observed in the south (2.3±1.9μgl-1) than in the center (1.3±1.2μgl-1) or north (1.4±1.7μgl-1). In contrast, waters were mainly undersaturated in O2, due to the upwelling of oxygen poor Warm Deep Water (WDW). The negative relationship between the δpCO2 and the %O2 saturation suggested that planktonic metabolic activities played a role in these gases dynamics, along with the upwelling of WDW. However, these relationships could not be observed from the results of the incubation experiments, probably because of different temporal scales between gas exchanges in incubation experiments and in situ CO2 and O2 dynamics. The dynamics of CO2 and O2 were solely related to the net community production (NCP) and to the gross primary production (GPP) when only stations with Chl-a>1μgl-1 were considered. A significant relationship was, however, found between δpCO2 and the primary production until the time of sampling for all stations when estimated from nutrients depletion between surface and subsurface waters. Finally, the distribution of CO2 and O2 were related to the biomass of diatoms and, contrarily to other seas, to the biomass of phytoflagellates. © 2013 Elsevier Ltd.
author Di Fiori, Eugenia
Schloss, Irene R.
Paparazzo, Flavio Emiliano
author_facet Di Fiori, Eugenia
Schloss, Irene R.
Paparazzo, Flavio Emiliano
author_sort Di Fiori, Eugenia
title The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea
title_short The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea
title_full The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea
title_fullStr The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea
title_full_unstemmed The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea
title_sort role of phytoplankton composition and microbial community metabolism in sea-air δpco2 variation in the weddell sea
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670637_v82_n_p44_Moreau
http://hdl.handle.net/20.500.12110/paper_09670637_v82_n_p44_Moreau
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