An evaluation of Antarctic sea-ice thickness from the Global Ice-Ocean Modeling and Assimilation System based on in situ and satellite observations
<p>Antarctic sea ice is an important component of the Earth system. However, its role in the Earth system is still unclear 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 A...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-05-01
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| Series: | The Cryosphere |
| Online Access: | https://tc.copernicus.org/articles/16/1807/2022/tc-16-1807-2022.pdf |
| Summary: | <p>Antarctic sea ice is an important component of the Earth
system. However, its role in the Earth system is still unclear 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 being 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 in 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 in Antarctic sea ice.
However, due to deficiencies in the 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 the
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.</p> |
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| ISSN: | 1994-0416 1994-0424 |