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Evaluation of the Arctic Sea-Ice Simulation on SODA3 Datasets

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Abstract

This study evaluates the Arctic sea-ice simulation of the SODA3 dataset driven by different atmospheric forcing fields and explores the errors of the Arctic sea-ice simulation caused by the forcing field. We find that the SODA3 data driven by different forcing fields represent a significant systematical error in the simulation of Arctic sea-ice concentration, showing a low concentration of thick ice and a high concentration of thin ice. In terms of sea-ice extent, the SODA3 data from different versions well characterize the interannual variability and declining trend in the observed data, but they overestimate the overall Arctic sea-ice extent, which is related to excessive simulation of ice in the sea-ice margin. Compared to observations, all the chosen SODA3 reanalysis versions driven by different atmospheric forcing generally tend to underestimate the Arctic sea-ice thickness, especially for thick ice in the multi-year sea-ice regions. Inaccurate simulations of Arctic sea-ice transport may partly explain the error in SODA3 sea-ice thickness in multi-year sea-ice areas. The results of different SDOA3 versions differ greatly in the Beaufort Sea, the Fram Strait, and the Central Arctic Sea. The difference in sea-ice thickness among different SODA3 versions is primarily due to the thermodynamic contribution, which may come from the diversity of atmospheric forcing fields. Our work provides a reference for using SODA3 data to study Arctic sea ice.

摘要

本文评估了由不同大气强迫场驱动的SODA3数据集对北极海冰的模拟能力,并探究了大气强迫场对北极海冰模拟的误差来源。结果表明,SODA3数据集对北极海冰密集度的模拟存在显著的系统偏差,表现为厚冰区海冰密集度偏低、薄冰区海冰密集度偏高;对海冰范围模拟较好,能再现与观测一致的年际变化和下降趋势,但由于边缘区的高估,导致整个北极海冰范围偏高。与观测结果相比,SODA3再分析数据集均显示对北极海冰厚度的低估,特别是多年海冰厚冰区。SODA3对北极海冰输运模拟的高估在一定程度上解释了这种多年海冰区海冰厚度的偏差。不同大气强迫场驱动的SODA3的海冰厚度模拟在波弗特海、弗拉姆海峡和北冰洋中部存在较大差异,这主要受大气强迫场不确定性带来的海冰热力学过程的影响。本文的工作将为利用SODA3数据进行北极海冰研究提供一定的参考。

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Acknowledgements

The authors are grateful to the providers of the publicly accessible data used in the paper. This study is supported by the Opening Project of Key Laboratory of Marine Science and Numerical Modeling, MNR (2020-ZD-01), the Special Funds for Creative Research (2022C61540), the National Natural Science Foundation (Grant Nos. 41776004, 41876224), the Fundamental Research Funds for the Central Universities (B210203020), and the Opening Project of Key Laboratory of Marine Environmental Information Technology (20195052912).

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Correspondence to Xuezhu Wang.

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Article Highlights

• Inaccurate simulations of Arctic sea-ice extent in SODA3 result from overestimating ice concentration along the sea-ice edge zone.

• The overestimation of sea-ice drift rates in SODA3 is mainly responsible for inaccurate simulations of Arctic sea-ice thickness.

• Model uncertainty in SODA3 primarily results in the overestimation of sea-ice drift rates.

• Inter-version differences of SODA3 in sea-ice thickness may be dominated by thermodynamic processes.

This paper is a contribution to the special issue on Changing Arctic Climate and Low/Mid-latitudes Connections.

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Ge, Z., Wang, X. & Wang, X. Evaluation of the Arctic Sea-Ice Simulation on SODA3 Datasets. Adv. Atmos. Sci. 40, 2302–2317 (2023). https://doi.org/10.1007/s00376-023-2320-6

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  • DOI: https://doi.org/10.1007/s00376-023-2320-6

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