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Increased variability of the Arctic summer ice extent in a warmer climate

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Goosse, Hugues [UCL] Arzel, O. [University of New South Wales] Bitz, Cecilia M. [University of Washington] de Montety, Anne [UCL] Vancoppenolle, Martin [UCL]

Simulations performed with general circulation models and a model of intermediate complexity show that the variability of the September sea ice extent in the Arctic of the 21st century increases first when the mean extent decreases from present-day values. A maximum of the variance is found when the mean September ice extent is around 3 million km(2). For lower extents, the variance declines with the mean extent. The behavior is clearly different in Antarctica where the variance always decreases as the mean ice extent decreases, following roughly a square-root law compatible with very simple geometric arguments. Several mechanisms are responsible for the non-linear behavior of the Arctic. However, the strong interhemispheric contrast suggests that the difference in geometrical setting, with an open ocean in the south and a semi-closed basin in the north, plays a significant role. Citation: Goosse, H., O. Arzel, C. M. Bitz, A. de Montety, and M. Vancoppenolle (2009), Increased variability of the Arctic summer ice extent in a warmer climate, Geophys. Res. Lett., 36, L23702, doi: 10.1029/2009GL040546.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2009
Language Anglais
Journal information "Geophysical Research Letters" - Vol. 36, p. L23702 (2009)
Peer reviewed yes
Publisher American Geophysical Union ((United States) Washington)
issn 0094-8276
e-issn 1944-8007
Publication status Publié
Affiliations UCL - SC/PHYS - Département de physique
UCL - SST/ELI/ELIC - Earth & Climate
Links
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Bibliographic reference Goosse, Hugues ; Arzel, O. ; Bitz, Cecilia M. ; de Montety, Anne ; Vancoppenolle, Martin. Increased variability of the Arctic summer ice extent in a warmer climate. In: Geophysical Research Letters, Vol. 36, p. L23702 (2009)
Permanent URL http://hdl.handle.net/2078.1/35121