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Consequences of poor representation of Arctic sea-ice albedo and cloud-radiation interactions in the CMIP5 model ensemble
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Meteorology .
2013 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 40, no 16, 4374-4379 p.Article in journal (Refereed) Published
Abstract [en]

Clouds significantly influence the Arctic surface energy budget and a realistic representation of this impact is a key for proper simulation of the present-day and future climate. Considerable across-model spread in cloud variables remains in the fifth phase of Coupled Model Intercomparison Project ensemble and partly explains the substantial across-model spread in the surface radiative effect of the clouds. In summer, the extensive model differences in sea-ice albedo, which sets the potential of the cloud-albedo effect, are strongly positively correlated to their cloud radiative effect. This indicates that the model's sea-ice albedo not only determines the amount, but also the sign of its cloud radiative effect. The analysis further suggests that the present-day annual amplitude of sea-ice cover depends inversely on the model's sea-ice albedo. Given the present-day across-model spread in sea-ice albedo and coverage, a transition to a summer ice-free Arctic ocean translates to a model-span of increased surface shortwave absorption of about 75 W m(- 2).

Place, publisher, year, edition, pages
2013. Vol. 40, no 16, 4374-4379 p.
Keyword [en]
CMIP5, cloud radiative effect, Arctic, sea-ice albedo
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-96123DOI: 10.1002/grl.50768ISI: 000324529000046OAI: oai:DiVA.org:su-96123DiVA: diva2:663838
Note

AuthorCount:2;

Funding agencies:

European Union 244067 

Available from: 2013-11-13 Created: 2013-11-11 Last updated: 2017-12-06Bibliographically approved

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