Sensitivity of the Southern Ocean sea-ice budget to sea-ice model parameters ...

• Main Authors: Uotila, Petteri, Nie, Yafei, Li, Chengkun, Vancoppenolle, Martin, Cheng, Bin, Boeira Dias, Fabio, Lv, Xianqing
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Southern Ocean; Sea ice
• Online Access: https://dx.doi.org/10.57757/iugg23-0186; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016304

<!--!introduction!--> The Southern Ocean sea-ice budget, which consists of dynamic and thermodynamic processes, synthesizes many important aspects of air-sea-ice interaction. However, many Earth System Models struggle to reproduce realistic sea-ice budget partly because of inadequate understanding of required model parameter adjustments. In this study, we investigate the sensitivity of sea-ice concentration and volume budgets to 18 sea-ice model parameters in the Southern Ocean. The analysis is based on a total of 449 model runs and two sensitivity methods. We found that the simulated sea-ice budgets are sensitive to sea-ice strength, snow thermal conductivity, the number of sea-ice thickness categories, lateral melting, and air-ice drag and ice-ocean drag. Optimized ice-ocean and air-ice drag coefficients reduce the model error in terms of sea-ice concentration budget about 10%. Ten combinations of sea-ice model parameter values yielding to improved sea-ice extent, and sea-ice volume and concentration ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...