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| Titel |
How reversible is sea ice loss? |
| VerfasserIn |
J. K. Ridley, J. A. Lowe, H. T. Hewitt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 6, no. 1 ; Nr. 6, no. 1 (2012-02-13), S.193-198 |
| Datensatznummer |
250003384
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| Publikation (Nr.) |
 copernicus.org/tc-6-193-2012.pdf |
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| Zusammenfassung |
| It is well accepted that increasing atmospheric CO2 results in global
warming, leading to a decline in polar sea ice area. Here, the specific
question of whether there is a tipping point in the sea ice cover is
investigated. The global climate model HadCM3 is used to map the trajectory
of sea ice area under idealised scenarios. The atmospheric CO2 is first
ramped up to four times pre-industrial levels (4 × CO2), then ramped
down to pre-industrial levels. We also examine the impact of
stabilising climate at 4 × CO2 prior to ramping CO2 down to
pre-industrial levels. Against global mean temperature, Arctic sea ice area
is reversible, while the Antarctic sea ice shows some asymmetric behaviour –
its rate of change slower, with falling temperatures, than its rate of
change with rising temperatures. However, we show that the asymmetric behaviour
is driven by hemispherical differences in temperature change
between transient and stabilisation periods. We find no irreversible
behaviour in the sea ice cover. |
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