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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ftunibueairesbd:todo:paper_09670637_v82_n_p44_Moreau 2023-10-29T02:40:29+01:00 The role of phytoplankton composition and microbial community metabolism in sea-air δpCO2 variation in the Weddell Sea Moreau, S. di Fiori, E. Schloss, I.R. Almandoz, G.O. Esteves, J.L. Paparazzo, F.E. Ferreyra, G.A. https://hdl.handle.net/20.500.12110/paper_09670637_v82_n_p44_Moreau unknown http://hdl.handle.net/20.500.12110/paper_09670637_v82_n_p44_Moreau info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 chlorophyll a diatom flagellate microbial community net primary production nutrient limitation upwelling warm water Southern Ocean Bacillariophyta Phytomastigophorea JOUR ftunibueairesbd https://doi.org/20.500.12110/paper_09670637_v82_n_p44_Moreau 2023-10-05T01:18:26Z 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. ... Journal/Newspaper Southern Ocean Weddell Sea Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
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 chlorophyll a diatom flagellate microbial community net primary production nutrient limitation upwelling warm water Southern Ocean Bacillariophyta Phytomastigophorea |
spellingShingle |
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 chlorophyll a diatom flagellate microbial community net primary production nutrient limitation upwelling warm water Southern Ocean Bacillariophyta Phytomastigophorea Moreau, S. di Fiori, E. Schloss, I.R. Almandoz, G.O. Esteves, J.L. Paparazzo, F.E. Ferreyra, G.A. 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 Primary production Biomass Dynamics Experiments Metabolism Microorganisms Nutrients Physiology Phytoplankton Carbon dioxide air-sea interaction biological pump chlorophyll a diatom flagellate microbial community net primary production nutrient limitation upwelling warm water Southern Ocean 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. Fil:di Fiori, E. Universidad de Buenos Aires. ... |
format |
Journal/Newspaper |
author |
Moreau, S. di Fiori, E. Schloss, I.R. Almandoz, G.O. Esteves, J.L. Paparazzo, F.E. Ferreyra, G.A. |
author_facet |
Moreau, S. di Fiori, E. Schloss, I.R. Almandoz, G.O. Esteves, J.L. Paparazzo, F.E. Ferreyra, G.A. |
author_sort |
Moreau, S. |
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 |
url |
https://hdl.handle.net/20.500.12110/paper_09670637_v82_n_p44_Moreau |
genre |
Southern Ocean Weddell Sea |
genre_facet |
Southern Ocean Weddell Sea |
op_relation |
http://hdl.handle.net/20.500.12110/paper_09670637_v82_n_p44_Moreau |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar |
op_doi |
https://doi.org/20.500.12110/paper_09670637_v82_n_p44_Moreau |
_version_ |
1781068676476174336 |