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| Titel |
On the existence of stable seasonally varying Arctic sea ice in simple models |
| VerfasserIn |
Woosok Moon, John Wettlaufer |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091261
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| Publikation (Nr.) |
 EGU/EGU2014-5544.pdf |
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| Zusammenfassung |
| Within the framework of lower order thermodynamic theories for the climatic evolution of
Arctic sea ice we isolate the conditions required for the existence of stable seasonally-varying
solutions, in which ice forms each winter and melts away each summer. This is done by
constructing a two-season model from the continuously evolving theory of Eisenman and
Wettlaufer EW09 and showing that seasonally-varying states are unstable under constant
annual average short-wave radiative forcing. However, dividing the summer season into two
intervals (ice covered and ice free) provides sufficient freedom to stabilize seasonal ice.
Simple perturbation theory shows that the condition for stability is determined by
when the ice vanishes in summer and hence the relative magnitudes of the summer
heat flux over the ocean versus over the ice. This scenario is examined within the
context of greenhouse gas warming, as a function of which stability conditions are
discerned.
Eisenman, I., and J.-S. Wettlaufer, “Nonlinear threshold behavior during the loss of Arctic
sea ice,” Proc. Natl. Acad. Sci. USA, 106, 28–32, 2009. |
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