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| Titel |
Albedo parametrization and reversibility of sea ice decay |
| VerfasserIn |
M. Müller-Stoffels, R. Wackerbauer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 19, no. 1 ; Nr. 19, no. 1 (2012-02-09), S.81-94 |
| Datensatznummer |
250014166
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| Publikation (Nr.) |
 copernicus.org/npg-19-81-2012.pdf |
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| Zusammenfassung |
| The Arctic's sea ice cover has been receding rapidly in recent years, and
global climate models typically predict a further decline over the next
century. It is an open question whether a possible loss of Arctic sea ice is
reversible. We study the stability of Arctic model sea ice in a conceptual,
two-dimensional energy-based regular network model of the ice-ocean layer
that considers ARM's longwave radiative budget data and SHEBA albedo
measurements. Seasonal ice cover, perennial ice and perennial open water are
asymptotic states accessible by the model. We show that the shape of albedo
parameterization near the melting temperature differentiates between
reversible continuous sea ice decrease under atmospheric forcing and
hysteresis behavior. Fixed points induced solely by the surface energy budget
are essential for understanding the interaction of surface energy with the
radiative forcing and the underlying body of ice/water, particularly close to
a bifurcation point. Future studies will explore ice edge stability and
reversibility in this lattice model, generalized to a latitudinal transect
with spatiotemporal lateral atmospheric heat transfer and high spatial
resolution. |
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