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Dependence of the Arctic Ocean ice thickness distribution on the poleward energy flux in the atmosphere
Responsible organisation
2002 (English)In: J. Geophys. Res., Vol. 107, no C10, 1-17 p.Article in journal (Refereed) Published
Abstract [en]

The sensitivity of the Arctic Ocean ice cover on the atmospheric poleward energy flux, D, is studied using a coupled column model of the ocean, ice, and atmosphere. In the model, the ice cover is described by a thickness distribution and the atmosphere is a simple two-stream gray body in radiative equilibrium. It is shown that the thickness distribution, in combination with the albedo function, gives a strong nonlinear response to positive perturbations of D. The response on D is sensitive to the albedo parameterization and the shape of the thickness distribution, controlled by ridging and divergence. An increase of about 9 W m-2 from a standard value of D = 103 W m-2 has a dramatic effect, reducing the ice thickness by more than 2 m, and generates a large open-water fraction during summer. The reduction of ice thickness is characterized by a clear transition between two regimes, going from a regime where first-year ice survives the next summer melt period to a seasonal ice regime where the first-year ice melts completely. It is shown that the existence of seasonal ice regime is dependent on the surface mixed layer thickness. The model enters a completely ice-free state if the thickness of the mixed layer is increased above a threshold value. The adjustment timescale for the ice cover is 6 years for small positive and negative perturbations in D. For larger positive perturbations of about 10 W m-2, the adjustment timescale is up to 20 years.

Place, publisher, year, edition, pages
2002. Vol. 107, no C10, 1-17 p.
Keyword [en]
Arctic, Arctic Ocean, Climate dynamics, Ocean/atmosphere interactions, General: Arctic and Antarctic oceanography, Air/sea interactions, Ice mechanics and air/sea/ice exchange processes
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-214DOI: 10.1029/2000JC000723OAI: oai:DiVA.org:polar-214DiVA: diva2:568345
Note

Source: Polardok by Swedish Polar Research Secretariat

Available from: 2012-11-15 Created: 2012-11-15 Last updated: 2016-12-07

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CiteExportLink to record
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Citation style
  • apa
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  • 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
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Output format
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  • asciidoc
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