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Open AccessArticle

Evaluation of the Sea-Ice Simulation in the Upgraded Version of the Coupled Regional Atmosphere-Ocean- Sea Ice Model HIRHAM–NAOSIM 2.0

1
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Telegrafenberg A45, 14473 Potsdam, Germany
2
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Klußmannstraße 3d, 27570 Bremerhaven, Germany
3
Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(8), 431; https://doi.org/10.3390/atmos10080431
Received: 5 June 2019 / Revised: 20 July 2019 / Accepted: 23 July 2019 / Published: 26 July 2019
(This article belongs to the Special Issue Regional Climate Modeling: Ocean–Atmosphere Coupling)
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Abstract

The sea-ice climatology and sea-ice trends and variability are evaluated in simulations with the new version of the coupled Arctic atmosphere-ocean-sea ice model HIRHAM–NAOSIM 2.0. This version utilizes upgraded model components for the coupled subsystems, which include physical and numerical improvements and higher horizontal and vertical resolution, and a revised coupling procedure with the aid of the coupling software YAC (Yet Another Coupler). The model performance is evaluated against observationally based data sets and compared with the previous version. Ensemble simulations for the period 1979–2016 reveal that Arctic sea ice is thicker in all seasons and closer to observations than in the previous version. Wintertime biases in sea-ice extent, upper ocean temperatures, and near-surface air temperatures are reduced, while summertime biases are of similar magnitude as in the previous version. Problematic issues of the current model configuration and potential corrective measures and further developments are discussed. View Full-Text
Keywords: Arctic sea ice; coupled atmosphere-ocean-sea ice model; regional modeling Arctic sea ice; coupled atmosphere-ocean-sea ice model; regional modeling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Dorn, W.; Rinke, A.; Köberle, C.; Dethloff, K.; Gerdes, R. Evaluation of the Sea-Ice Simulation in the Upgraded Version of the Coupled Regional Atmosphere-Ocean- Sea Ice Model HIRHAM–NAOSIM 2.0. Atmosphere 2019, 10, 431.

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