An evaluation of Antarctic sea-ice thickness from the Global Ice-Ocean Modeling and Assimilation System based on in situ and satellite observations

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