Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake
Sub-Antarctic Mode Waters (SAMW), forming in the deep winter mixed layers in the Sub-Antarctic Zone (SAZ) to the north of the Antarctic Circumpolar Current (ACC), connect the ocean thermocline with the atmosphere, contributing to ocean carbon and heat uptake and transporting high-latitude nutrients...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5019698 2023-07-16T03:54:14+02:00 Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake Fernández Castro, B. Mazloff, M. Williams, R. Naveira Garabato, A. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019698 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3300 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019698 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-3300 2023-06-25T23:39:55Z Sub-Antarctic Mode Waters (SAMW), forming in the deep winter mixed layers in the Sub-Antarctic Zone (SAZ) to the north of the Antarctic Circumpolar Current (ACC), connect the ocean thermocline with the atmosphere, contributing to ocean carbon and heat uptake and transporting high-latitude nutrients northward, to fuel primary production at low latitudes. The important climatic role of SAMW is controlled by the rate of fluid subduction from the deep winter mixed layers and the concentration of heat, carbon and nutrients at the end of winter. These concentrations depend on a range of processes, both physical (air-sea exchange, transport of Antarctic waters across the ACC, along ACC advection, eddy fluxes, diapycnal mixing, etc.) and biogeochemical (biological uptake, export and remineralisation), whose relative contributions are very poorly understood. With a Lagrangian particle-tracking experiment in a data-assimilative coupled physico-biogeochemical model of the Southern Ocean (B-SOSE), we assess the origin of the water masses reaching SAMW formation regions and the physico- and biogeochemical transformations occurring along their transport pathways. Our results underline the importance of the advection of subtropical waters along the ACC for the sequestration of heat and anthropogenic carbon and in modulating the fertilization of the low-latitude thermocline. Conference Object Antarc* Antarctic Southern Ocean GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Sub-Antarctic Mode Waters (SAMW), forming in the deep winter mixed layers in the Sub-Antarctic Zone (SAZ) to the north of the Antarctic Circumpolar Current (ACC), connect the ocean thermocline with the atmosphere, contributing to ocean carbon and heat uptake and transporting high-latitude nutrients northward, to fuel primary production at low latitudes. The important climatic role of SAMW is controlled by the rate of fluid subduction from the deep winter mixed layers and the concentration of heat, carbon and nutrients at the end of winter. These concentrations depend on a range of processes, both physical (air-sea exchange, transport of Antarctic waters across the ACC, along ACC advection, eddy fluxes, diapycnal mixing, etc.) and biogeochemical (biological uptake, export and remineralisation), whose relative contributions are very poorly understood. With a Lagrangian particle-tracking experiment in a data-assimilative coupled physico-biogeochemical model of the Southern Ocean (B-SOSE), we assess the origin of the water masses reaching SAMW formation regions and the physico- and biogeochemical transformations occurring along their transport pathways. Our results underline the importance of the advection of subtropical waters along the ACC for the sequestration of heat and anthropogenic carbon and in modulating the fertilization of the low-latitude thermocline. |
format |
Conference Object |
author |
Fernández Castro, B. Mazloff, M. Williams, R. Naveira Garabato, A. |
spellingShingle |
Fernández Castro, B. Mazloff, M. Williams, R. Naveira Garabato, A. Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake |
author_facet |
Fernández Castro, B. Mazloff, M. Williams, R. Naveira Garabato, A. |
author_sort |
Fernández Castro, B. |
title |
Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake |
title_short |
Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake |
title_full |
Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake |
title_fullStr |
Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake |
title_full_unstemmed |
Lagrangian pathways for sub-Antarctic Mode Water formation and carbon uptake |
title_sort |
lagrangian pathways for sub-antarctic mode water formation and carbon uptake |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019698 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3300 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019698 |
op_doi |
https://doi.org/10.57757/IUGG23-3300 |
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1771551428028923904 |