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Nudging the Arctic Ocean to Quantify Sea Ice Feedbacks
Stockholms universitet, Naturvetenskapliga fakulteten, Meteorologiska institutionen (MISU).
Antal upphovsmän: 32019 (Engelska)Ingår i: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442, Vol. 32, nr 8, s. 2381-2395Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

With Arctic summer sea ice potentially disappearing halfway through this century, the surface albedo and insulating effects of Arctic sea ice will decrease considerably. The ongoing Arctic sea ice retreat also affects the strength of the Planck, lapse rate, cloud, and surface albedo feedbacks together with changes in the heat exchange between the ocean and the atmosphere, but their combined effect on climate sensitivity has not been quantified. This study presents an estimate of all Arctic sea ice related climate feedbacks combined. We use a new method to keep Arctic sea ice at its present-day (PD) distribution under a changing climate in a 50-yr CO2 doubling simulation, using a fully coupled global climate model (EC-Earth, version 2.3). We nudge the Arctic Ocean to the (monthly dependent) year 2000 mean temperature and minimum salinity fields on a mask representing PD sea ice cover. We are able to preserve about 95% of the PD mean March and 77% of the September PD Arctic sea ice extent by applying this method. Using simulations with and without nudging, we estimate the climate response associated with Arctic sea ice changes. The Arctic sea ice feedback globally equals 0.28 +/- 0.15 W m(-2) K-1. The total sea ice feedback thus amplifies the climate response for a doubling of CO2, in line with earlier findings. Our estimate of the Arctic sea ice feedback agrees reasonably well with earlier CMIP5 global climate feedback estimates and shows that the Arctic sea ice exerts a considerable effect on the Arctic and global climate sensitivity.

Ort, förlag, år, upplaga, sidor
2019. Vol. 32, nr 8, s. 2381-2395
Nyckelord [en]
Arctic, Sea ice, Feedback, Climate sensitivity, Feedback, Climate models
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-168645DOI: 10.1175/JCLI-D-18-0321.1ISI: 000463886900001OAI: oai:DiVA.org:su-168645DiVA, id: diva2:1313751
Tillgänglig från: 2019-05-06 Skapad: 2019-05-06 Senast uppdaterad: 2019-05-06Bibliografiskt granskad

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Totalt: 10 träffar
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