An assessment of the Arctic Ocean in a suite of interannual CORE-II simulations. Part I: Sea ice and solid freshwater.

Wang, Q., Ilicak, M., Gerdes, R., Drange, H., Aksenov, Y., Bailey, D., Bentsen, M., Biastoch, Arne , Bozec, A., Böning, Claus W. , Cassou, C., Chassignet, E., Coward, A. C., Curry, B., Danabasoglu, G., Danilov, S., Fernandez, E., Fogli, P. G., Fujii, Y., Griffies, S. M., Iovino, D., Jahn, A., Jung, T., Large, W. G., Lee, C., Lique, C., Lu, J., Masina, S., Nurser, A. J. G., Rabe, B., Roth, Christina, Salas y Melia, D., Samuels, B. L., Spence, P., Tsujino, H., Valcke, S., Voldoire, A., Wang, X. and Yeager, S. G. (2016) An assessment of the Arctic Ocean in a suite of interannual CORE-II simulations. Part I: Sea ice and solid freshwater. Ocean Modelling, 99 . pp. 110-132. DOI 10.1016/j.ocemod.2015.12.008.

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Supplementary data:

Abstract

Highlights:
• Arctic sea ice extent and solid freshwater in 14 CORE-II models are inter-compared.
• The models better represent the variability than the mean state.
• The September ice extent trend is reasonably represented by the model ensemble mean.
• The descending trend of ice thickness is underestimated compared to observations.
• The models underestimate the reduction in solid freshwater content in recent years.

Abstract:
The Arctic Ocean simulated in fourteen global ocean-sea ice models in the framework of the Coordinated Ocean-ice Reference Experiments, phase II (CORE II) is analyzed. The focus is on the Arctic sea ice extent, the solid freshwater (FW) sources and solid freshwater content (FWC). Available observations are used for model evaluation. The variability of sea ice extent and solid FW budget is more consistently reproduced than their mean state in the models. The descending trend of September sea ice extent is well simulated in terms of the model ensemble mean. Models overestimating sea ice thickness tend to underestimate the descending trend of September sea ice extent. The models underestimate the observed sea ice thinning trend by a factor of two. When averaged on decadal time scales, the variation of Arctic solid FWC is contributed by those of both sea ice production and sea ice transport, which are out of phase in time. The solid FWC decreased in the recent decades, caused mainly by the reduction in sea ice thickness. The models did not simulate the acceleration of sea ice thickness decline, leading to an underestimation of solid FWC trend after 2000. The common model behavior, including the tendency to underestimate the trend of sea ice thickness and March sea ice extent, remains to be improved.

Document Type: Article
Additional Information: WOS:000371792800008
Keywords: Arctic Ocean; Sea ice; Freshwater; CORE II atmospheric forcing
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
AWI
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.ocemod.2015.12.008
ISSN: 1463-5003
Related URLs:
Projects: CLIVAR, REKLIM, RACE, EarthClim, NOTUR/NorStore, GEMINA, TEA-COSI
Expeditions/Models/Experiments:
Date Deposited: 18 Dec 2015 11:48
Last Modified: 25 Feb 2019 13:19
URI: http://oceanrep.geomar.de/id/eprint/30678

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