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Vertical transport in the ocean due to sub-mesoscale structures: Impacts in the Kerguelen region

Rosso, Isabella; Hogg, Andrew; Strutton, Peter G; Kiss, A E; Matear, R.J.; Klocker, Andreas; van Sebille, Erik

Description

The summertime phytoplankton bloom near the Kerguelen Plateau is in marked contrast to the low-chlorophyll conditions typical of the Southern Ocean and is thought to arise from natural iron fertilisation. The mechanisms of iron supply to the euphotic zone in this region are poorly understood, and numerical studies of iron transport have until now omitted fine-scale (sub-mesoscale) dynamics which have been shown to significantly increase vertical transport in other parts of the ocean. We present...[Show more]

dc.contributor.authorRosso, Isabella
dc.contributor.authorHogg, Andrew
dc.contributor.authorStrutton, Peter G
dc.contributor.authorKiss, A E
dc.contributor.authorMatear, R.J.
dc.contributor.authorKlocker, Andreas
dc.contributor.authorvan Sebille, Erik
dc.date.accessioned2015-12-13T22:27:10Z
dc.identifier.issn1463-5003
dc.identifier.urihttp://hdl.handle.net/1885/73821
dc.description.abstractThe summertime phytoplankton bloom near the Kerguelen Plateau is in marked contrast to the low-chlorophyll conditions typical of the Southern Ocean and is thought to arise from natural iron fertilisation. The mechanisms of iron supply to the euphotic zone in this region are poorly understood, and numerical studies of iron transport have until now omitted fine-scale (sub-mesoscale) dynamics which have been shown to significantly increase vertical transport in other parts of the ocean. We present the first sub-mesoscale-resolving study of the flow and vertical transport in this region. The modelled transport and flow structure agree well with observations. We find that an increase in horizontal resolution from mesoscale-resolving (1/20°) to 1/80° resolves sub-mesoscale filamentary frontal structures in which vertical velocities are dramatically higher and are consistent with available observations. Lagrangian tracking shows that water is advected to the surface from much greater depth in the sub-mesoscale-resolving experiment, and that vertical exchange is far more rapid and frequent. This study of sub-mesoscale vertical velocities sets the foundation for subsequent investigation of iron transport in this environment.
dc.publisherElsevier
dc.sourceOcean Modelling
dc.subjectKeywords: Iron; Horizontal resolution; Lagrangian particles; Lagrangian tracking; Meso scale; Natural iron fertilisation; Southern ocean; Vertical transports; Vertical velocity; Oceanography; chlorophyll; flow structure; flow velocity; iron; mesoscale motion; phyto Lagrangian particle; Mesoscales; Southern Ocean; Vertical velocity
dc.titleVertical transport in the ocean due to sub-mesoscale structures: Impacts in the Kerguelen region
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume80
dc.date.issued2014
local.identifier.absfor040503 - Physical Oceanography
local.identifier.ariespublicationU3488905xPUB3845
local.type.statusPublished Version
local.contributor.affiliationRosso, Isabella, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationHogg, Andrew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationStrutton, Peter G, University of Tasmania
local.contributor.affiliationKiss, A E, University of New South Wales
local.contributor.affiliationMatear, R.J., CSIRO Division of Marine Research
local.contributor.affiliationKlocker, Andreas, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationvan Sebille, Erik, University of New South Wales
local.description.embargo2037-12-31
local.bibliographicCitation.startpage10
local.bibliographicCitation.lastpage23
local.identifier.doi10.1016/j.ocemod.2014.05.001
local.identifier.absseo961104 - Physical and Chemical Conditions of Water in Marine Environments
dc.date.updated2019-03-12T07:25:48Z
local.identifier.scopusID2-s2.0-84902984895
local.identifier.thomsonID000340310300002
CollectionsANU Research Publications

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