Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Generation of Subsurface Anticyclones at Arctic Surface Fronts due to a Surface Stress
Stockholm University, Faculty of Science, Department of Meteorology .ORCID iD: 0000-0003-3033-1639
Stockholm University, Faculty of Science, Department of Meteorology .
Show others and affiliations
2017 (English)In: Journal of Physical Oceanography, ISSN 0022-3670, E-ISSN 1520-0485, Vol. 47, no 11, p. 2653-2671Article in journal (Refereed) Published
Abstract [en]

Isolated anticyclones are frequently observed below the mixed layer in the Arctic Ocean. Some of these subsurface anticyclones are thought to originate at surface fronts. However, previous idealized simulations with no surface stress show that only cyclone–anticyclone dipoles can propagate away from baroclinically unstable surface fronts. Numerical simulations of fronts subject to a surface stress presented here show that a surface stress in the same direction as the geostrophic flow inhibits dipole propagation away from the front. On the other hand, a surface stress in the opposite direction to the geostrophic flow helps dipoles to propagate away from the front. Regardless of the surface stress at the point of dipole formation, these dipoles can be broken up on a time scale of days when a surface stress is applied in the right direction. The dipole breakup leads to the deeper anticyclonic component becoming an isolated subsurface eddy. The breakup of the dipole occurs because the cyclonic component of the dipole in the mixed layer is subject to an additional advection because of the Ekman flow. When the Ekman transport has a component oriented from the anticyclonic part of the dipole toward the cyclonic part then the cyclone is advected away from the anticyclone and the dipole is broken up. When the Ekman transport is in other directions relative to the dipole axis, it also leads to deviations in the trajectory of the dipole. A scaling is presented for the rate at which the surface cyclone is advected that holds across a range of mixed layer depths and surface stress magnitudes in these simulations. The results may be relevant to other regions of the ocean with similar near-surface stratification profiles.

Place, publisher, year, edition, pages
2017. Vol. 47, no 11, p. 2653-2671
Keyword [en]
Arctic, Ageostrophic circulations, Mesoscale processes, Anticyclones, Mixed layer, Numerical analysis/modeling
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:su:diva-150455DOI: 10.1175/JPO-D-17-0022.1ISI: 000417674100001OAI: oai:DiVA.org:su-150455DiVA, id: diva2:1167992
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-01-13Bibliographically approved

Open Access in DiVA

fulltext(2980 kB)13 downloads
File information
File name FULLTEXT01.pdfFile size 2980 kBChecksum SHA-512
4bb9ee1b71fd02eba0dc91320b75ca5fa2f8672771d5848069f24ba469cf6ea0c9b6544ea04e2b6053b58b82b89290697b612cda490269f17f9138d266b68225
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Brannigan, LiamNycander, JonasNilsson, Johan
By organisation
Department of Meteorology
In the same journal
Journal of Physical Oceanography
Oceanography, Hydrology and Water Resources

Search outside of DiVA

GoogleGoogle Scholar
Total: 13 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 40 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf