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One-dimensional evolution of the upper water column in the Atlantic sector of the Arctic Ocean in winter

Citation

Fer, I and Peterson, AK and Randelhoff, A and Meyer, A, One-dimensional evolution of the upper water column in the Atlantic sector of the Arctic Ocean in winter, Journal of Geophysical Research: Oceans, 122, (3) pp. 1665-1682. ISSN 2169-9275 (2017) [Refereed Article]


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DOI: doi:10.1002/2016JC012431

Abstract

A one‐dimensional model is employed to reproduce the observed time evolution of hydrographic properties in the upper water column during winter, between 26 January and 11 March 2015, in a region north of Svalbard in the Nansen Basin of the Arctic Ocean. From an observed initial state, vertical diffusion equations for temperature and salinity give the hydrographic conditions at a later stage. Observations of microstructure are used to synthesize profiles of vertical diffusivity, K, representative of varying wind forcing conditions. The ice‐ocean heat and salt fluxes at the ice‐ocean interface are implemented as external source terms, estimated from the salt and enthalpy budgets, using friction velocity from the Rossby similarity drag relation, and the ice core temperature profiles. We are able to reproduce the temporal evolution of hydrography satisfactorily for two pairs of measured profiles, suggesting that the vertical processes dominated the observed changes. Sensitivity tests reveal a significant dependence on K. Variation in other variables, such as the temperature gradient of the sea ice, the fraction of heat going to ice melt, and the turbulent exchange coefficient for heat, are relatively less important. The increase in salinity as a result of freezing and brine release is approximately 10%, significantly less than that due to entrainment (90%) from beneath the mixed layer. Entrainment was elevated during episodic storm events, leading to melting. The results highlight the contribution of storms to mixing in the upper Arctic Ocean and its impact on ice melt and mixed‐layer salt and nutrient budgets.

Item Details

Item Type:Refereed Article
Keywords:Arctic Ocean, winter, heat flux, hydrography, Nansen Basin mixing, mixed layer, sea-ice, brine, storms, nutrient
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
Author:Meyer, A (Dr Amelie Meyer)
ID Code:125336
Year Published:2017
Deposited By:Oceans and Cryosphere
Deposited On:2018-04-13
Last Modified:2018-04-16
Downloads:0

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