Preprints
https://doi.org/10.5194/gmd-2022-170
https://doi.org/10.5194/gmd-2022-170
Submitted as: model evaluation paper
05 Jul 2022
Submitted as: model evaluation paper | 05 Jul 2022
Status: this preprint is currently under review for the journal GMD.

Sensitivity of NEMO4.0-SI3 model parameters on sea ice budgets in the Southern Ocean

Yafei Nie1,2,6, Chengkun Li3, Martin Vancoppenolle4, Bin Cheng5, Fabio Boeira Dias2, Xianqing Lv6, and Petteri Uotila2 Yafei Nie et al.
  • 1Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao, China
  • 2Institute for Atmospheric and Earth System Research (INAR), Faculty of Science, University of Helsinki, Helsinki, Finland
  • 3Department of Computer Science, University of Helsinki, Helsinki, Finland
  • 4Laboratoire d’Océanographie et du Climat, CNRS/IRD/MNHN, Sorbonne Université, 75252, Paris, France
  • 5Finnish Meteorological Institute, Helsinki, Finland
  • 6Qingdao National Laboratory for Marine Science and Technology, Qingdao, China

Abstract. The seasonally-dependent Antarctic sea ice concentration (SIC) budget is well-observed and synthesizes many important air-sea-ice interaction processes. However, it is rarely well simulated in Earth System Models and means to tune the former are not well understood. In this study, we investigate the sensitivity of 18 key NEMO4.0-SI3 (Nucleus for European Modelling of the Ocean coupled with the Sea Ice modelling Integrated Initiative) model parameters on modelled SIC and sea ice volume (SIV) budgets in the Southern Ocean based on a total of 449 model runs and two global sensitivity analysis methods. We found the simulated SIC/SIV budgets are sensitivity to ice strength, the thermal conductivity of snow, the number of ice categories, two parameters related to lateral melting, ice-ocean drag coefficient and air-ice drag coefficient. A better quality of ice-ocean drag coefficient and air-ice drag coefficient can reduce the root-mean-square error between simulated and observed SIC budget by about 10 %. We recommend ten combinations of NEMO4.0-SI3 model parameters that could yield better sea ice extent, SIV seasonal cycles and SIC budgets than using the standard values.

Yafei Nie et al.

Status: open (until 12 Sep 2022)

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Yafei Nie et al.

Yafei Nie et al.

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Short summary
State-of-the-art Earth System Models simulate the observed sea ice extent relatively well, but this is often due to errors in the dynamic and the other processes in the simulated sea ice changes cancelling each other out. We assessed the sensitivity of these processes simulated by the coupled ocean-sea ice model NEMO4.0-SI3 to 18 parameters. The performance of the model in simulating sea ice change processes was ultimately improved by adjusting the three identified key parameters.