Tides regulate the flow and density of Antarctic Bottom Water from the western Ross Sea.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
08 Mar 2023
08 Mar 2023
Historique:
received:
13
11
2022
accepted:
06
03
2023
entrez:
8
3
2023
pubmed:
9
3
2023
medline:
9
3
2023
Statut:
epublish
Résumé
Antarctic Bottom Water (AABW) stores heat and gases over decades to centuries after contact with the atmosphere during formation on the Antarctic shelf and subsequent flow into the global deep ocean. Dense water from the western Ross Sea, a primary source of AABW, shows changes in water properties and volume over the last few decades. Here we show, using multiple years of moored observations, that the density and speed of the outflow are consistent with a release from the Drygalski Trough controlled by the density in Terra Nova Bay (the "accelerator") and the tidal mixing (the "brake"). We suggest tides create two peaks in density and flow each year at the equinoxes and could cause changes of ~ 30% in the flow and density over the 18.6-year lunar nodal tide. Based on our dynamic model, we find tides can explain much of the decadal variability in the outflow with longer-term changes likely driven by the density in Terra Nova Bay.
Identifiants
pubmed: 36890202
doi: 10.1038/s41598-023-31008-w
pii: 10.1038/s41598-023-31008-w
pmc: PMC9995308
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
3873Subventions
Organisme : New Zealand Strategic Investment Fund: Antarctic Science Platform
ID : Contract ANTA1801
Organisme : New Zealand Strategic Investment Fund: Antarctic Science Platform
ID : Contract ANTA1801
Organisme : Italian National Program for Antarctic Research
ID : MORSea project
Organisme : Italian National Program for Antarctic Research
ID : MORSea project
Organisme : Italian National Program for Antarctic Research
ID : MORSea project
Commentaires et corrections
Type : ErratumIn
Informations de copyright
© 2023. The Author(s).
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