Modeling ocean processes below Fimbulisen, Antarctica

Lars H. Smedsrud, Adrian Jenkins, David M. Holland, Ole A. Nøst

Research output: Contribution to journalArticle

Abstract

Model simulations of circulation and melting beneath Fimbulisen, Antarctica, obtained using an isopycnic coordinate ocean model, are presented. Model results compare well with available observations of currents and hydrography in the open ocean to the north of Fimbulisen and suggest that Warm Deep Water exists above the level of a sub-ice-shelf bedrock sill, the principal pathway for warm waters to enter the sub-ice-shelf cavity. The model shows a southward inflow of Warm Deep Water over this sill and into the cavity, producing a mean cavity temperature close to -1.0°C. This leads to high levels of basal melting (>10 m/a) at the grounding line of Jutulstraumen and an average melting over the ice shelf base close to 1.9 m/a. The southward inflow is a compensating flow caused by the northward outflow of fresh, cold water produced by the basal melting. Results on inflow and melting are difficult to validate since no in situ measurements yet exist in the cavity. If such high melt rates are realistic, the mass balance of Fimbulisen must be significantly negative, and the ice shelves along Dronning Maud Land must contribute about 4.4 mSv of melt water to the Weddell Sea, about 15% of the total Antarctic meltwater input to the Southern Ocean.

Original languageEnglish (US)
Article numberC01007
JournalJournal of Geophysical Research: Space Physics
Volume111
Issue number1
DOIs
StatePublished - Jan 8 2006

Fingerprint

land ice
ice shelf
Antarctic regions
Ice
oceans
cavity
Melting
warm water
melting
basal melting
inflow
Water
ocean
meltwater
cavities
sill
modeling
deep water
grounding line
hydrography

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Modeling ocean processes below Fimbulisen, Antarctica. / Smedsrud, Lars H.; Jenkins, Adrian; Holland, David M.; Nøst, Ole A.

In: Journal of Geophysical Research: Space Physics, Vol. 111, No. 1, C01007, 08.01.2006.

Research output: Contribution to journalArticle

Smedsrud, Lars H. ; Jenkins, Adrian ; Holland, David M. ; Nøst, Ole A. / Modeling ocean processes below Fimbulisen, Antarctica. In: Journal of Geophysical Research: Space Physics. 2006 ; Vol. 111, No. 1.
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