Antarctic Zone Flux Experiment (ANZFLUX) 1994

Penguins and accomplice plotting the takeover of R/V Nathaniel B. Palmer.

[Image of R/V N.B. Palmer and penguins during ANXFLUX]

ANZFLUX was a focused study of the anomalously thin ice and high heat fluxes in the eastern Weddell Sea conducted from two ice camps deployed from the ice breaker N. B. Palmer in July and August 1994. Timeseries of microstructure profiles, velocity and Reynolds stress profiles measured by a 5 beam Broadband Acoustic Doppler Profiler, and in situ measurements have been used to measure heat fluxes and determine the physical processes contributing to the very high vertical momentum and heat fluxes in the region.

Very strong wind-forced ice motions from the frequent storm systems generated turbulent friction velocities exceeding 2cms-1, providing sufficient turbulent kinetic energy to entrain heat fluxes of up to 400 Wm-2 across the deep ocean mixed layer. The typically 120m deep mixed layer depth changed rapidly as the ice (and our observing systems) were moved over eddy features which shallowed the pycnocline to as shallow as 60m depth, greatly enhancing the turbulent coupling between the surface and the warm underlying water within the weakly salt stratified pycnocline.

Last Reviewed: February 2003
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McPhee, M, S. Ackley, P. Guest, B. Huber, D. Martinson, J. Morison, R. Muench, L. Padman, T. Stanton., 1996. The Antarctic Zone Flux Experiment. Bulletin of American Meteorological Society, 77, 1221-1232.

Stanton, T. P., 1995b. Mixed Layer Structure and Turbulent Fluxes in the Eastern Weddell Sea During the ANZFLUX Experiment. Antarctic Journal of the United States.

Stanton, T. P., L. Padman, and R. A. Robertson, 1996. Heat Fluxes Through the Permanent Pycnocline in the Eastern Weddell Sea. Submitted to J. Geophys. Res.