Preprints
https://doi.org/10.5194/tc-2021-228
https://doi.org/10.5194/tc-2021-228

  20 Sep 2021

20 Sep 2021

Review status: this preprint is currently under review for the journal TC.

An Evaluation of Antarctic Sea Ice Thickness from the Global Ice-Ocean Modeling and Assimilation System based on In-situ and Satellite Observations

Sutao Liao1, Hao Luo1, Jinfei Wang1, Qian Shi1, Jinlun Zhang2, and Qinghua Yang1 Sutao Liao et al.
  • 1School of Atmospheric Sciences, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China
  • 2Polar Science Center, Applied Physics Lab, University of Washington, Seattle, WA 98105, USA

Abstract. Antarctic sea ice is an important component of the Earth system. However, its role in the Earth system is still not very clear due to limited Antarctic sea ice thickness (SIT) data. A reliable sea ice reanalysis can be useful to study Antarctic SIT and its role in the Earth system. Among various Antarctic sea ice reanalysis products, the Global Ice-Ocean Modeling and Assimilation System (GIOMAS) output is widely used in the research of Antarctic sea ice. As more Antarctic SIT observations with quality control are released, a further evaluation of Antarctic SIT from GIOMAS is conducted in this study based on in-situ and satellite observations. Generally, though only sea ice concentration is assimilated, GIOMAS can basically reproduce the observed variability of sea ice volume and its changes in the trend before and after 2013, indicating that GIOMAS is a good option to study the long-term variation of Antarctic sea ice. However, due to deficiencies in model and asymmetric changes in SIT caused by assimilation, GIOMAS underestimates Antarctic SIT especially in deformed ice regions, which has an impact on not only the mean state of SIT but also the variability. Thus, besides the further development of model, assimilating additional sea ice observations (e.g., SIT and sea ice drift) with advanced assimilation methods may be conducive to a more accurate estimation of Antarctic SIT.

Sutao Liao et al.

Status: open (until 15 Nov 2021)

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Sutao Liao et al.

Sutao Liao et al.

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Short summary
1. GIOMAS can basically reproduce the observed variability of Antarctic sea ice volume and its changes in the trend before and after 2013. 2. GIOMAS underestimates Antarctic sea ice thickness (SIT) especially in deformed ice zones. 3. Assimilating additional sea ice observations with advanced assimilation methods may result in a more accurate estimation of Antarctic SIT.