The sensitivity of landfast sea ice to atmospheric forcing in single-column model simulations: a case study at Zhongshan Station, Antarctica
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Published:2022-05-17
Issue:5
Volume:16
Page:1873-1887
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Gu Fengguan, Yang QinghuaORCID, Kauker FrankORCID, Liu Changwei, Hao Guanghua, Yang Chao-YuanORCID, Liu Jiping, Heil PetraORCID, Li XueweiORCID, Han Bo
Abstract
Abstract. Single-column sea ice models are used to focus on the thermodynamic
evolution of the ice. Generally, these models are forced by atmospheric
reanalysis in the absence of atmospheric in situ observations. Here we assess the
sea ice thickness simulated by a single-column model (ICEPACK) with
in situ observations obtained off Zhongshan Station for the austral winter of 2016.
In the reanalysis, the surface air temperature is about 1 ∘C lower,
the total precipitation is about 2 mm d−1 greater, and the surface
wind speed is about 2 m s−1 higher compared to the in situ observations. We designed sensitivity experiments to evaluate the simulation
bias in sea ice thickness due to the uncertainty in the individual
atmospheric forcing variables. Our results show that the unrealistic
precipitation in the reanalysis leads to a bias of 14.5 cm in sea ice
thickness and 17.3 cm in snow depth. In addition, our data show that
increasing snow depth works to gradually inhibit the growth of sea ice
associated with thermal blanketing by the snow due to changing the vertical
heat flux. Conversely, given suitable conditions, the sea ice thickness may
grow suddenly when the snow load gives rise to flooding and leads to
snow-ice formation. However, there are still uncertainties related to the
model results because superimposed ice and snowdrift are not implemented in
the version of the ice model used and because snow-ice formation might be
overestimated at locations with landfast sea ice.
Funder
National Natural Science Foundation of China Basic and Applied Basic Research Foundation of Guangdong Province Southern Marine Science and Engineering Guangdong Laboratory
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference74 articles.
1. Barthélemy, A., Goosse, H., Fichefet, T., and Lecomte, O.: On the
sensitivity of Antarctic sea ice model biases to atmospheric forcing
uncertainties, Clim. Dynam., 51, 1585–1603,
https://doi.org/10.1007/s00382-017-3972-7, 2018. 2. Bitz, C. M., Holland, M. M., Weaver, A. J., and Eby, M.: Simulating the
ice-thickness distribution in a coupled climate model, J. Geophys. Res.-Oceans, 106, 2441–2463, https://doi.org/10.1029/1999JC000113, 2001. 3. Bracegirdle, T. J. and Marshall, G. J.: The reliability of Antarctic
tropospheric pressure and temperature in the latest global reanalyses, J.
Climate, 25, 7138–7146, https://doi.org/10.1175/JCLI-D-11-00685.1, 2012. 4. Briegleb, B. P. and Light, B.: A Delta-Eddington multiple scattering
parameterization for solar radiation in the sea ice component of the
Community Climate System Model, NCAR Tech. Note NCAR/TN-472+ STR, 1-108,
https://github.com/CICE-Consortium/CICE/blob/master/doc/PDF/BL_NCAR2007.pdf (last access: 14 May 2022), 2007. 5. Bromwich, D. H., Fogt, R. L., Hodges, K. I., and Walsh, J. E.: A
tropospheric assessment of the ERA-40, NCEP, and JRA-25 global reanalyses in
the polar regions, J. Geophys. Res.-Atmos., 112, D10111,
https://doi.org/10.1029/2006JD007859, 2007.
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