Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG
Physical and biogeochemical processes in the Southern Ocean are fundamental for modulating global climate. In this context, a process-based understanding of how Antarctic diatoms control primary production and carbon export, and hence global-ocean carbon sequestration, has been identified as a scien...
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2021
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Online Access: | https://doi.org/10.3389/feart.2021.579198.s004 https://figshare.com/articles/figure/Image4_Sinking_Diatom_Assemblages_as_a_Key_Driver_for_Deep_Carbon_and_Silicon_Export_in_the_Scotia_Sea_Southern_Ocean_JPEG/14795703 |
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ftfrontimediafig:oai:figshare.com:article/14795703 2023-05-15T14:03:39+02:00 Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG D. Zúñiga A. Sanchez-Vidal M. M. Flexas D. Carroll M. M. Rufino G. Spreen A. Calafat F. Abrantes 2021-06-17T04:19:08Z https://doi.org/10.3389/feart.2021.579198.s004 https://figshare.com/articles/figure/Image4_Sinking_Diatom_Assemblages_as_a_Key_Driver_for_Deep_Carbon_and_Silicon_Export_in_the_Scotia_Sea_Southern_Ocean_JPEG/14795703 unknown doi:10.3389/feart.2021.579198.s004 https://figshare.com/articles/figure/Image4_Sinking_Diatom_Assemblages_as_a_Key_Driver_for_Deep_Carbon_and_Silicon_Export_in_the_Scotia_Sea_Southern_Ocean_JPEG/14795703 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change diatoms sea ice marginal ice zone carbon export biogenic silicon scotia sea southern ocean corethron pennatum Image Figure 2021 ftfrontimediafig https://doi.org/10.3389/feart.2021.579198.s004 2021-06-23T23:02:03Z Physical and biogeochemical processes in the Southern Ocean are fundamental for modulating global climate. In this context, a process-based understanding of how Antarctic diatoms control primary production and carbon export, and hence global-ocean carbon sequestration, has been identified as a scientific priority. Here we use novel sediment trap observations in combination with a data-assimilative ocean biogeochemistry model (ECCO-Darwin) to understand how environmental conditions trigger diatom ecology in the iron-fertilized southern Scotia Sea. We unravel the role of diatoms assemblage in controlling the biogeochemistry of sinking material escaping from the euphotic zone, and discuss the link between changes in upper-ocean environmental conditions and the composition of settling material exported from the surface to 1,000 m depth from March 2012 to January 2013. The combined analysis of in situ observations and model simulation suggests that an anomalous sea-ice episode in early summer 2012–2013 favored (via restratification due to sea-ice melt) an early massive bloom of Corethron pennatum that rapidly sank to depth. This event drove high biogenic silicon to organic carbon export ratios, while modulating the carbon and nitrogen isotopic signals of sinking organic matter reaching the deep ocean. Our findings highlight the role of diatom ecology in modulating silicon vs. carbon sequestration efficiency, a critical factor for determining the stoichiometric relationship of limiting nutrients in the Southern Ocean. Still Image Antarc* Antarctic Scotia Sea Sea ice Southern Ocean Frontiers: Figshare Antarctic Scotia Sea Southern Ocean |
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Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change diatoms sea ice marginal ice zone carbon export biogenic silicon scotia sea southern ocean corethron pennatum |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change diatoms sea ice marginal ice zone carbon export biogenic silicon scotia sea southern ocean corethron pennatum D. Zúñiga A. Sanchez-Vidal M. M. Flexas D. Carroll M. M. Rufino G. Spreen A. Calafat F. Abrantes Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change diatoms sea ice marginal ice zone carbon export biogenic silicon scotia sea southern ocean corethron pennatum |
description |
Physical and biogeochemical processes in the Southern Ocean are fundamental for modulating global climate. In this context, a process-based understanding of how Antarctic diatoms control primary production and carbon export, and hence global-ocean carbon sequestration, has been identified as a scientific priority. Here we use novel sediment trap observations in combination with a data-assimilative ocean biogeochemistry model (ECCO-Darwin) to understand how environmental conditions trigger diatom ecology in the iron-fertilized southern Scotia Sea. We unravel the role of diatoms assemblage in controlling the biogeochemistry of sinking material escaping from the euphotic zone, and discuss the link between changes in upper-ocean environmental conditions and the composition of settling material exported from the surface to 1,000 m depth from March 2012 to January 2013. The combined analysis of in situ observations and model simulation suggests that an anomalous sea-ice episode in early summer 2012–2013 favored (via restratification due to sea-ice melt) an early massive bloom of Corethron pennatum that rapidly sank to depth. This event drove high biogenic silicon to organic carbon export ratios, while modulating the carbon and nitrogen isotopic signals of sinking organic matter reaching the deep ocean. Our findings highlight the role of diatom ecology in modulating silicon vs. carbon sequestration efficiency, a critical factor for determining the stoichiometric relationship of limiting nutrients in the Southern Ocean. |
format |
Still Image |
author |
D. Zúñiga A. Sanchez-Vidal M. M. Flexas D. Carroll M. M. Rufino G. Spreen A. Calafat F. Abrantes |
author_facet |
D. Zúñiga A. Sanchez-Vidal M. M. Flexas D. Carroll M. M. Rufino G. Spreen A. Calafat F. Abrantes |
author_sort |
D. Zúñiga |
title |
Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG |
title_short |
Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG |
title_full |
Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG |
title_fullStr |
Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG |
title_full_unstemmed |
Image4_Sinking Diatom Assemblages as a Key Driver for Deep Carbon and Silicon Export in the Scotia Sea (Southern Ocean).JPEG |
title_sort |
image4_sinking diatom assemblages as a key driver for deep carbon and silicon export in the scotia sea (southern ocean).jpeg |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.579198.s004 https://figshare.com/articles/figure/Image4_Sinking_Diatom_Assemblages_as_a_Key_Driver_for_Deep_Carbon_and_Silicon_Export_in_the_Scotia_Sea_Southern_Ocean_JPEG/14795703 |
geographic |
Antarctic Scotia Sea Southern Ocean |
geographic_facet |
Antarctic Scotia Sea Southern Ocean |
genre |
Antarc* Antarctic Scotia Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Scotia Sea Sea ice Southern Ocean |
op_relation |
doi:10.3389/feart.2021.579198.s004 https://figshare.com/articles/figure/Image4_Sinking_Diatom_Assemblages_as_a_Key_Driver_for_Deep_Carbon_and_Silicon_Export_in_the_Scotia_Sea_Southern_Ocean_JPEG/14795703 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.579198.s004 |
_version_ |
1766274427413069824 |