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Arctic rapid sea ice loss events in regional coupled climate scenario experiments
SMHI, Research Department, Climate research - Rossby Centre.
SMHI, Research Department, Climate research - Rossby Centre.ORCID iD: 0000-0003-2051-743X
2013 (English)In: Ocean Science, ISSN 1812-0784, E-ISSN 1812-0792, Vol. 9, no 2, 217-248 p.Article in journal (Refereed) Published
Abstract [en]

Rapid sea ice loss events (RILEs) in a mini-ensemble of regional Arctic coupled climate model scenario experiments are analyzed. Mechanisms of sudden ice loss are strongly related to atmospheric circulation conditions and preconditioning by sea ice thinning during the seasons and years before the event. Clustering of events in time suggests a strong control by large-scale atmospheric circulation. Anomalous atmospheric circulation is providing warm air anomalies of up to 5 K and is forcing ice flow, affecting winter ice growth. Even without a seasonal preconditioning during winter, ice drop events can be initiated by anomalous inflow of warm air during summer. It is shown that RILEs can be generated based on atmospheric circulation changes as a major driving force without major competing mechanisms, other than occasional longwave effects during spring and summer. Other anomalous seasonal radiative forcing or short-lived forcers (e.g., soot) play minor roles or no role at all in our model. RILEs initiated by ocean forcing do not occur in the model, although cannot be ruled out due to model limitations. Mechanisms found are qualitatively in line with observations of the 2007 RILE.

Place, publisher, year, edition, pages
2013. Vol. 9, no 2, 217-248 p.
National Category
Climate Research
Research subject
Climate
Identifiers
URN: urn:nbn:se:smhi:diva-409DOI: 10.5194/os-9-217-2013ISI: 000320348700002OAI: oai:DiVA.org:smhi-409DiVA: diva2:799999
Available from: 2015-04-01 Created: 2015-03-31 Last updated: 2016-05-23Bibliographically approved

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Doescher, RalfKoenigk, Torben
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