Impact of internal wave drag on Arctic sea ice

Flocco, Daniela; Feltham, Daniel; Schroeder, David; Aksenov, Yevgeny ORCID: https://orcid.org/0000-0001-6132-3434; Siahaan, Antony; Tsamados, Michel. 2024 Impact of internal wave drag on Arctic sea ice. Annals of Glaciology. 1-16. 10.1017/aog.2024.37

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Abstract/Summary

A parameterization of the impact of internal waves on momentum transfer at the sea-ice–ocean interface based on previous work by McPhee has been implemented in a sea-ice model for the first time. The ice–ocean drag from internal waves is relevant for shallow mixed layer depth and the presence of a density jump at the pycnocline and is also a function of the strength of the stratification beneath the ocean mixed layer and geometry of the ice interface. We present results from a coupled sea-ice–ocean model where the parameterization of internal wave drag has been implemented. We conducted simulations spanning the years from 2000 to 2017. We find a deceleration of ice drift by 5–8% in both winter and summer, but with significant spatial and temporal variation reaching seasonal average values of ∼10%. The spatial variation of ice transport leads to local impacts on deformed ice of magnitude ∼0.05 m (2–5%), and reductions in ocean-to-ice heat fluxes of ∼1Wm−2, and a decrease in bottom melt of ∼0.02–0.04 cm d−1. There is an increase of up to 15% in thickness and ice concentration in the Canadian Arctic and a 10% overall impact on the total sea-ice volume.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1017/aog.2024.37
ISSN:	0260-3055
Additional Keywords:	ice thickness, internal wave drag, sea-ice modelling
Date made live:	12 Nov 2024 20:47 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/538373

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