Direct measurements of turbulent momentum, heat and salt fluxes under landfast ice in the Baltic Sea

Authors: Uusikivi, Jari; Ehn, Jens; Granskog, Mats A.

Source: Annals of Glaciology, Volume 44, Number 1, November 2006 , pp. 42-46(5)

Publisher: International Glaciological Society

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Abstract:

Measurements of under-ice turbulence were performed using an acoustic three-dimensional current meter with an attached fast-repetition temperature-conductivity sensor at two coastal areas in the Baltic Sea during two winters. Observations covered both the ice-growth and spring-melt periods. The objective of these measurements was to obtain knowledge of under-ice turbulence and oceanic heat and salt fluxes to and from the ice in the coastal fast-ice region using eddy correlation techniques. The maximum observed daily average heat flux was 1 W m⁻², and the maximum for 10 min periods was an order of magnitude larger. Under-ice turbulence was much smaller than that recorded in the oceans and in coastal regions with tide. These results provide better knowledge of under-ice turbulence and heat-flux variations and are useful for the future development of a Baltic Sea ice salinity model.

Document Type: Research article

DOI: 10.3189/172756406781811150

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