Article (Scientific journals)
Efects of ocean mesoscale eddies on atmosphere–sea ice–ocean interactions of Adélie Land, East Antarctica
Huot, P.-V.; Kittel, Christoph; Fichefet, T. et al.
2022In Climate Dynamics, 59 (1-2), p. 41 - 60
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Keywords :
Atmosphere–sea ice–ocean interactions; Mesoscale; Regional Coupled Model; Sea ice; Southern Ocean; Atmospheric Science
Abstract :
Heat and momentum exchanges at the Southern Ocean surface are crucial for the Earth’s Climate, but the importance of the small-scale spatial variability of these surface fluxes is poorly understood. Here, we explore how small-scale heterogeneities of the surface conditions due in particular to ocean eddies affect the atmosphere–sea ice–ocean interactions off Adélie Land, in East Antarctica. To this end, we use a high-resolution regional atmosphere–sea ice–ocean coupled model based on the NEMO-LIM and MAR models. We explore how the atmosphere responds to small-scale heterogeneity of the ocean or sea ice surface conditions, how eddies affect the sea ice and atmosphere, and how the eddy-driven surface fluxes impact the heat, freshwater, and momentum budget of the ocean. The atmosphere is found to be more sensitive to small-scale surface temperature gradients above the ice-covered than above the ice-free ocean. Sea ice concentration is found to be weaker above anticyclonic than cyclonic eddies due to increased sea ice melting or freezing (0.8 cm/day) partly compensated by sea ice convergence or divergence. The imprint of ice-free eddies on the atmosphere is weak, but in the presence of sea ice, air warming (+ 0.3 ∘C) and wind intensification (+ 0.1 m/s) are found above anticyclonic eddies, while cyclonic eddies have the opposite effects. Removing the interactions of eddies with the sea ice or atmosphere does not affect the total sea ice volume, but increases the ocean kinetic energy by 8% and weakens northward advection of sea ice, leading to a 15% decrease in freshwater flux north of 62.5 ∘S and weaker ocean restratification.
Research Center/Unit :
SPHERES - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Huot, P.-V. ;  Earth and Life Institute, George Lemaitre Centre for Earth and Climate Research, UCLouvain, Louvain-la-Neuve, Belgium ; Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
Kittel, Christoph  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Fichefet, T.;  Earth and Life Institute, George Lemaitre Centre for Earth and Climate Research, UCLouvain, Louvain-la-Neuve, Belgium
Jourdain, N.C.;  Universitée Grenoble Alpes, CNRS/IRD/G-INP, IGE, Grenoble, France
Fettweis, Xavier  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Language :
English
Title :
Efects of ocean mesoscale eddies on atmosphere–sea ice–ocean interactions of Adélie Land, East Antarctica
Publication date :
January 2022
Journal title :
Climate Dynamics
ISSN :
0930-7575
eISSN :
1432-0894
Publisher :
Springer, Germany
Volume :
59
Issue :
1-2
Pages :
41 - 60
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
European Projects :
H2020 - 101003826 - CRiceS - Climate relevant interactions and feedbacks: the key role of sea ice and snow in the polar and global climate system
Name of the research project :
Air–Ice–Ocean Interactions in Antarctica ; PARAMOUR; CRiceS
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
EU - European Union
Funding text :
This research was conducted within the F.R.S.-FNRS PDR T.0002.16 “Air–Ice–Ocean Interactions in Antarctica” and the PARAMOUR project, funded by the FWO and F.R.S.-FNRS under the Excellence of Science (EOS) program (Grant EOS O0100718F). N. Jourdain’s contribution was supported by the CRiceS project, which received funding from the European Union’s Horizon H2020 research and innovation program under grant agreement No 101003826.
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since 03 February 2022

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