Landfast ice controls on turbulence in Antarctic coastal seas

Inall, Mark E.; Brearley, J. Alexander ORCID: https://orcid.org/0000-0003-3700-8017; Henley, Sian F.; Fraser, Alexander D.; Reed, Sarah. 2022 Landfast ice controls on turbulence in Antarctic coastal seas. Journal of Geophysical Research: Oceans, 127 (1), e2021JC017963. 18, pp. https://doi.org/10.1029/2021JC017963

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.102...

Abstract/Summary

Knowledge of the ocean surface layer beneath Antarctic landfast ice is sparse. In this article surface layer turbulent and fine structure are quantified with and without landfast ice in the same West Antarctic Peninsula location. Landfast ice reduced turbulence levels locally to an order of magnitude less than ice-free values, and near-inertial energy and sub-inertial tidal energy levels to less than half their ice-free values. Vertical turbulent heat and nutrient fluxes were, respectively, 6 and 10 times greater than previously estimated. Under-ice tidal energy dissipation over the entire Antarctic continental shelf due to seasonal landfast ice cover is estimated at 788 MW. The total rate of wind-generated turbulence in the surface ocean is greatly reduced by the presence of seasonal landfast ice to an average of 14% of the ice-free value, but with large sectoral variations. Counter-intuitively, however, tides and wind contribute approximately equally to the turbulent kinetic energy budget of the upper ocean between the Antarctic coastline and the maximal landfast ice extent, with large sectoral variations, attributed to geographic variations in the strength of the barotropic tide.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2021JC017963
ISSN:	2169-9275
Additional Keywords:	landfast ice, turbulence, wind, tides, mixing, nutrients
Date made live:	15 Dec 2021 16:45 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/531585

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2021JC017963

ISSN:

2169-9275

Additional Keywords:

landfast ice, turbulence, wind, tides, mixing, nutrients

Date made live:

15 Dec 2021 16:45 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/531585